:root {
  --bg-base: #0a0d14;
  --surface-1: #141821;
  --surface-2: #1c2230;
  --surface-3: #242c3d;
  --border-soft: rgba(255, 255, 255, 0.05);
  --border-strong: rgba(255, 255, 255, 0.1);
  --text-primary: #f0f2f8;
  --text-secondary: #a7b0c5;
  --text-muted: #647089;
  --accent: #6b8eff;
  --accent-soft: rgba(107, 142, 255, 0.14);
  --accent-glow: rgba(107, 142, 255, 0.2);
  --success: #4a9d6f;
  --error: #d96b6b;
  --warning: #c89a4a;
  --glass-bg: rgba(255, 255, 255, 0.03);
  --glass-bg-hover: rgba(255, 255, 255, 0.055);
  --glass-bg-active: rgba(255, 255, 255, 0.07);
  --glass-border: rgba(255, 255, 255, 0.09);
  --glass-border-hover: rgba(255, 255, 255, 0.13);
  --glass-inset: 0 1px 0 rgba(255, 255, 255, 0.12) inset;
  --scrollbar-thumb: #7c8599;
  --scrollbar-thumb-hover: #9aa3b8;
  --status-online: #22c55e;
  --status-online-glow: rgba(34, 197, 94, 0.1);
  --status-offline: #ef4444;
  --status-offline-glow: rgba(239, 68, 68, 0.08);
  --radius-pill: 9999px;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 10px;
  --motion-fast: 150ms;
  --motion-base: 200ms;
  --motion-slow: 280ms;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --font-sans: "Inter", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
}

body.light-mode {
  --bg-base: #f2f4f9;
  --surface-1: #f9fbff;
  --surface-2: #edf1f8;
  --surface-3: #e7edf6;
  --border-soft: rgba(8, 14, 28, 0.06);
  --border-strong: rgba(8, 14, 28, 0.1);
  --text-primary: #1a2436;
  --text-secondary: #576176;
  --text-muted: #6f7a8e;
  --accent-soft: rgba(107, 142, 255, 0.18);
  --glass-bg: rgba(8, 14, 28, 0.04);
  --glass-bg-hover: rgba(8, 14, 28, 0.065);
  --glass-bg-active: rgba(8, 14, 28, 0.085);
  --glass-border: rgba(8, 14, 28, 0.1);
  --glass-border-hover: rgba(8, 14, 28, 0.14);
  --glass-inset: 0 1px 0 rgba(255, 255, 255, 0.42) inset;
  --scrollbar-thumb: #9aa3b8;
  --scrollbar-thumb-hover: #7c8599;
  --status-online: #16a34a;
  --status-online-glow: rgba(22, 163, 74, 0.12);
  --status-offline: #dc2626;
  --status-offline-glow: rgba(220, 38, 38, 0.1);
}

body.light-mode .app-bg-gradient {
  background:
    radial-gradient(circle at 82% -8%, rgba(255, 184, 122, 0.2), transparent 44%),
    radial-gradient(circle at 12% 118%, rgba(126, 147, 206, 0.16), transparent 42%),
    linear-gradient(180deg, rgba(242, 244, 249, 0.2), rgba(242, 244, 249, 0.34));
}

body.light-mode .orb {
  opacity: 0.16;
}

body.light-mode .input-wrapper {
  background: transparent;
}

body {
  --mode-accent: var(--accent);
  --mode-accent-soft: var(--accent-soft);
}

body.mode-fast {
  --mode-accent: #7B82E5;
  --mode-accent-soft: rgba(123, 130, 229, 0.16);
}

body.mode-thinking {
  --mode-accent: #5C66DE;
  --mode-accent-soft: rgba(92, 102, 222, 0.20);
}

/* Deeper accents for better contrast in light theme */
body.light-mode.mode-fast {
  --mode-accent: #5C66DE;
  --mode-accent-soft: rgba(92, 102, 222, 0.20);
}

body.light-mode.mode-thinking {
  --mode-accent: #4951C9;
  --mode-accent-soft: rgba(73, 81, 201, 0.22);
}

body.light-mode .mode-backdrop,
body.light-mode #sidebar-overlay {
  background: rgba(18, 24, 38, 0.22);
}

body.light-mode .bot-message::before {
  background-image: url("/logo/Logo_transparent.png?v=2");
  background-size: 80%;
  background-position: center;
  background-repeat: no-repeat;
}

body.light-mode .welcome-badge,
body.light-mode .new-chat-btn,
body.light-mode .mode-trigger,
body.light-mode .input-box,
body.light-mode .mode-dropdown,
body.light-mode .welcome-card,
body.light-mode .user-message .message-content,
body.light-mode .sources-container,
body.light-mode .protocol-status-container {
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.42) inset;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
  overflow: hidden;
}

body {
  background: var(--bg-base);
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.5;
  display: flex;
  transition:
    background-color 900ms cubic-bezier(0.2, 1, 0.25, 1),
    color 700ms cubic-bezier(0.2, 1, 0.25, 1);
}

/* Smooth theme transition (dark <-> light) */
.app-bg-gradient,
.bg-orbs,
.orb,
.sidebar,
.app-header,
.icon-btn,
.input-box,
.input-wrapper,
.mode-dropdown,
.mode-trigger,
.send-btn,
.attach-btn,
.message-content,
.user-message .message-content,
.sources-container,
.source-item,
.copy-btn,
.retry-thinking-btn {
  transition:
    background-color 460ms cubic-bezier(0.2, 1, 0.25, 1),
    color 340ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 360ms cubic-bezier(0.2, 1, 0.25, 1);
}

/* Theme cross-fade overlay (prevents harsh flash) */
.theme-fade {
  position: fixed;
  inset: 0;
  z-index: 2000;
  pointer-events: none;
  opacity: 0.08;
  transition: opacity 1800ms cubic-bezier(0.2, 1, 0.2, 1);
}

.theme-fade.theme-fade--dim {
  opacity: 0.12;
}

.theme-fade.theme-fade--out {
  opacity: 0;
}

/* Original-style day/night transition (1:1 behavior) */
#daynight-bg.container {
  display: flex;
  width: 100%;
  height: 100%;
  position: fixed;
  inset: 0;
  z-index: -3;
  pointer-events: none;
  overflow: hidden;
}

#daynight-bg.container .layer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  transition: all 4s ease;
  opacity: 0.5;
  display: flex;
  justify-content: center;
  align-items: center;
  line-height: 100%;
  overflow: hidden;
}

/* Smooth tone-shift for icons/text during theme switch */
body.theme-switching .header-tunduk,
body.theme-switching .header-tunduk svg,
body.theme-switching .logo-text,
body.theme-switching .logo-smile,
body.theme-switching .brand-name,
body.theme-switching .brand-logo,
body.theme-switching .mode-trigger,
body.theme-switching .mode-option,
body.theme-switching .mode-option-icon,
body.theme-switching .icon-btn,
body.theme-switching .send-btn,
body.theme-switching #theme-icon,
body.theme-switching .theme-wave-item {
  transition:
    color 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    fill 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    stroke 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    background-color 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    box-shadow 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    filter 2200ms cubic-bezier(0.2, 1, 0.25, 1),
    transform 1200ms cubic-bezier(0.2, 1, 0.25, 1),
    opacity 1200ms cubic-bezier(0.2, 1, 0.25, 1);
  transition-delay: var(--theme-wave-delay, 0ms);
}

body.theme-switching .theme-wave-item {
  position: relative;
  isolation: isolate;
}

body.theme-switching .theme-wave-item::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  z-index: -1;
  opacity: 0;
  transform: translateY(-102%);
  transition:
    transform 1250ms cubic-bezier(0.2, 1, 0.25, 1),
    opacity 1250ms cubic-bezier(0.2, 1, 0.25, 1);
  transition-delay: var(--theme-wave-delay, 0ms);
  will-change: transform, opacity;
}

body.theme-switching .theme-wave-item > * {
  position: relative;
  z-index: 1;
}

body.theme-switching.theme-to-dark .theme-wave-item::after {
  background: linear-gradient(180deg, rgba(2, 5, 12, 0.36), rgba(2, 5, 12, 0.22));
  transform: translateY(-102%);
  opacity: 0;
}

body.theme-switching.theme-wave-active.theme-to-dark .theme-wave-item::after {
  transform: translateY(0%);
  opacity: 0.92;
}

body.theme-switching.theme-to-light .theme-wave-item::after {
  background: linear-gradient(180deg, rgba(255, 246, 233, 0.36), rgba(255, 246, 233, 0.2));
  transform: translateY(102%);
  opacity: 0;
}

body.theme-switching.theme-wave-active.theme-to-light .theme-wave-item::after {
  transform: translateY(0%);
  opacity: 0.92;
}

#daynight-bg.container .layer > div.text {
  display: flex;
  text-align: center;
  color: rgba(255, 255, 255, 0);
  font-size: 36px;
  width: 50%;
  height: 50%;
  justify-content: center;
  align-items: center;
  transition: transform 4s ease, opacity 1.5s linear;
  pointer-events: none;
  user-select: none;
}

#daynight-bg.container .layer.filter {
  background: linear-gradient(0deg, rgba(238, 130, 238, 0.44), rgba(0, 68, 136, 0.52));
}

#daynight-bg.container .layer.sunset {
  background: linear-gradient(0deg, rgba(255, 165, 0, 0.6), rgba(0, 79, 167, 0.6));
  opacity: 0.5;
}

#daynight-bg.container .layer.sunset > div {
  transform: translateY(0%);
  opacity: 1;
}

#daynight-bg.container .layer.nighttime {
  background: linear-gradient(0deg, rgba(0, 68, 170, 0.6), rgba(0, 0, 0, 0.84));
  opacity: 0;
}

#daynight-bg.container .layer.nighttime > div {
  transform: translateY(-100%);
  opacity: 0;
}

#daynight-bg.container .layer.stars {
  opacity: 0.1;
  transition: opacity 4s ease, transform 4s ease;
  transform: translateY(-5%);
}

#daynight-bg.container .layer.stars::before,
#daynight-bg.container .layer.stars::after {
  content: "";
  position: absolute;
  width: 150px;
  height: 2px;
  border-radius: 999px;
  pointer-events: none;
  opacity: 0;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.95), rgba(255, 255, 255, 0));
  filter: drop-shadow(0 0 5px rgba(255, 255, 255, 0.45));
  transform: translate3d(0, 0, 0) rotate(-18deg);
}

/* Disable legacy pseudo shooting stars (replaced by dedicated layer) */
#daynight-bg.container .layer.stars::before,
#daynight-bg.container .layer.stars::after {
  display: none;
}

#daynight-bg.container .layer.stars::before {
  top: 16%;
  left: -18%;
}

#daynight-bg.container .layer.stars::after {
  top: 38%;
  left: -26%;
}

#daynight-bg.container .layer.stars > div {
  transition: transform 0s;
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 3px;
  border-radius: 2px;
  background: #fff;
  box-shadow: 0 0 2px #fff;
}

#daynight-bg.container .layer.shooting-stars {
  opacity: 0;
  transition: opacity 420ms ease;
  pointer-events: none;
  overflow: hidden;
}

#daynight-bg.container.night .layer.shooting-stars {
  opacity: 1;
}

#daynight-bg.container .layer.shooting-stars .shooting-star {
  position: absolute;
  left: 0;
  top: 0;
  width: var(--trail, 120px);
  height: 2px;
  border-radius: 999px;
  background: linear-gradient(90deg, rgba(255, 255, 255, 0), rgba(220, 236, 255, 0.75) 64%, rgba(255, 255, 255, 0.98) 100%);
  filter: drop-shadow(0 0 6px rgba(255, 255, 255, 0.65));
  transform: translate3d(var(--sx, -20vw), var(--sy, 20vh), 0) rotate(var(--angle, 18deg));
  opacity: 0;
  animation: meteor-fall var(--d, 10.5s) linear infinite;
  animation-delay: var(--delay, 0s);
  will-change: transform, opacity;
}

@keyframes meteor-fall {
  0% {
    opacity: 0;
    transform: translate3d(var(--sx, -20vw), var(--sy, 20vh), 0) rotate(var(--angle, 18deg));
  }
  10% {
    opacity: 0.92;
    transform: translate3d(var(--sx, -20vw), var(--sy, 20vh), 0) rotate(var(--angle, 18deg));
  }
  44% {
    opacity: 0.92;
    transform: translate3d(calc(var(--sx, -20vw) + var(--dx, 118vw)), calc(var(--sy, 20vh) + var(--dy, 30vh)), 0) rotate(var(--angle, 18deg));
  }
  52% {
    opacity: 0;
    transform: translate3d(calc(var(--sx, -20vw) + var(--dx, 118vw) + 3vw), calc(var(--sy, 20vh) + var(--dy, 30vh) + 1.5vh), 0) rotate(var(--angle, 18deg));
  }
  100% {
    opacity: 0;
    transform: translate3d(calc(var(--sx, -20vw) + var(--dx, 118vw) + 3vw), calc(var(--sy, 20vh) + var(--dy, 30vh) + 1.5vh), 0) rotate(var(--angle, 18deg));
  }
}

#daynight-bg.container .note {
  display: none;
}

#daynight-bg.container.night .layer:nth-child(2) {
  opacity: 0;
}

#daynight-bg.container.night .layer:nth-child(2) > div {
  transform: translateY(100%);
  opacity: 0;
}

#daynight-bg.container.night .layer:nth-child(3) {
  opacity: 0.8;
}

#daynight-bg.container.night .layer:nth-child(3) > div {
  transform: translateY(0%);
  opacity: 1;
}

#daynight-bg.container.night .layer.stars {
  opacity: 1;
  transform: translateY(0%);
  transition: opacity 8s ease, transform 15s ease;
}


.bg-orbs {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
  mix-blend-mode: screen;
}

.bg-orbs::before,
.bg-orbs::after {
  content: "";
  position: absolute;
  top: -34%;
  right: -24%;
  width: 48rem;
  height: 16rem;
  transform: rotate(-20deg) skewX(-34deg);
  background: linear-gradient(90deg, rgba(255, 255, 255, 0.08), rgba(107, 142, 255, 0.16), rgba(255, 255, 255, 0.04));
  filter: blur(64px);
  opacity: 0.16;
}

.bg-orbs::after {
  top: -44%;
  right: -36%;
  width: 54rem;
  height: 18rem;
  opacity: 0.11;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(74px);
  opacity: 0.42;
  will-change: transform;
  animation: orbFloat 72s ease-in-out infinite alternate;
}

.orb-1 {
  top: -16%;
  right: -10%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(107, 142, 255, 0.9) 0%, rgba(107, 142, 255, 0.08) 56%, transparent 72%);
}

.orb-2 {
  bottom: -22%;
  left: -8%;
  width: 540px;
  height: 540px;
  background: radial-gradient(circle, rgba(74, 108, 219, 0.85) 0%, rgba(74, 108, 219, 0.08) 58%, transparent 72%);
  opacity: 0.3;
  animation-duration: 84s;
}

.orb-3 {
  top: 34%;
  left: 42%;
  width: 380px;
  height: 380px;
  background: radial-gradient(circle, rgba(90, 122, 232, 0.7) 0%, rgba(90, 122, 232, 0.06) 56%, transparent 72%);
  opacity: 0.22;
  animation-duration: 96s;
}

@keyframes orbFloat {
  from { transform: translate(0, 0); }
  to { transform: translate(20px, -18px); }
}

.app-bg-gradient {
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(circle at 50% -20%, rgba(107, 142, 255, 0.09), transparent 40%),
    radial-gradient(circle at 10% 120%, rgba(74, 108, 219, 0.08), transparent 38%),
    linear-gradient(180deg, rgba(10, 13, 20, 0.56), rgba(10, 13, 20, 0.78));
  pointer-events: none;
}

.sidebar {
  width: 294px;
  background: var(--glass-bg);
  border-right: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  padding: 18px 14px;
  flex-shrink: 0;
  z-index: 1000;
  transition: transform var(--motion-slow) var(--ease-out), width var(--motion-slow) var(--ease-out), padding var(--motion-slow) var(--ease-out);
}

body.sidebar-collapsed .sidebar {
  width: 0;
  padding: 0;
  border-right: none;
  overflow: hidden;
}

.sidebar-header {
  margin-bottom: 14px;
}

.brand-title {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-left: 6px;
}

.brand-logo,
.header-tunduk,
.welcome-tunduk {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--mode-accent);
}

.brand-logo {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  overflow: hidden;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  background: transparent;
  transition: filter 520ms cubic-bezier(0.2, 1, 0.25, 1);
}

.brand-logo img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  filter: brightness(1.1) drop-shadow(0 0 8px rgba(107, 142, 255, 0.28));
  transition: filter 520ms cubic-bezier(0.2, 1, 0.25, 1);
}

body.light-mode .brand-logo img {
  filter: brightness(0.88) saturate(1.15);
}

.brand-name {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--mode-accent);
  margin-left: 2px;
}

.brand-m {
  font-size: inherit;
}

.sidebar-collapse-btn {
  margin-left: auto;
}

.sidebar-expand-btn {
  display: none;
}

body.sidebar-collapsed .sidebar-expand-btn {
  display: inline-flex;
}

.sidebar-games {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 14px;
}

.game-link {
  height: 38px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: var(--surface-1);
  color: var(--text-secondary);
  font-size: 13px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 0 14px;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease;
}

.game-link:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.game-link:active {
  background: var(--surface-3);
}

.new-chat-btn {
  height: 44px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: var(--surface-2);
  color: var(--text-primary);
  font-size: 14px;
  font-weight: 500;
  padding: 0 20px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  margin-bottom: 14px;
  transition: background var(--motion-fast) ease;
}

.new-chat-btn:hover { background: var(--surface-3); }
.new-chat-btn:active { background: var(--surface-3); }

.chat-history {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

.chat-history h3,
.history-group-label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  font-weight: 500;
}

.chat-history h3 {
  padding: 8px 20px 4px;
}

.history-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
}

#history-list {
  list-style: none;
  padding: 4px 0;
}

.history-group-label {
  padding: 16px 20px 8px;
}

.history-item {
  margin: 2px 8px;
  padding: 10px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  color: var(--text-secondary);
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

body.theme-switching .history-item,
body.theme-switching .history-group-label {
  transition:
    color 1400ms cubic-bezier(0.2, 1, 0.25, 1),
    background-color 1400ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 1400ms cubic-bezier(0.2, 1, 0.25, 1);
  transition-delay: var(--theme-wave-delay, 0ms);
}

/* Prevent flicker in message text during theme wave */
body.theme-switching .message-content,
body.theme-switching .message-content * {
  animation: none !important;
  transition:
    color 1400ms cubic-bezier(0.2, 1, 0.25, 1),
    background-color 1400ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 1400ms cubic-bezier(0.2, 1, 0.25, 1) !important;
}

.history-item:hover { background: var(--glass-bg-hover); border-color: var(--glass-border-hover); color: var(--text-primary); }
.history-item:active { background: var(--glass-bg-active); }
.history-item.active { background: var(--glass-bg-hover); border-color: var(--glass-border-hover); color: var(--text-primary); }

.main-content {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.app-layout {
  display: flex;
  flex-direction: column;
  width: 100%;
  min-height: 100vh;
}

.app-header {
  height: 64px;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  background: transparent;
  border-bottom: 1px solid var(--border-soft);
}

.header-left {
  display: flex;
  align-items: center;
  gap: 10px;
  min-width: 180px;
}

.header-tunduk {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-soft);
  background: var(--surface-1);
  box-shadow: var(--glass-inset);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.header-tunduk svg {
  width: 20px;
  height: 20px;
}

.header-status-dot {
  width: 9px;
  height: 9px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--text-muted);
  box-shadow: 0 0 0 0 rgba(100, 112, 137, 0.12);
}

.header-status-dot.is-online {
  background: var(--status-online);
  box-shadow: 0 0 0 1px var(--status-online-glow);
}

.header-status-dot.is-offline {
  background: var(--status-offline);
  box-shadow: 0 0 0 1px var(--status-offline-glow);
}

.header-status-dot.is-checking {
  background: var(--warning);
  animation: status-dot-pulse 1s ease-in-out infinite;
}

@keyframes status-dot-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.1); opacity: 0.88; }
}

.header-mode-fast svg {
  color: var(--mode-accent);
}

.header-mode-thinking svg {
  color: var(--mode-accent);
}

.asking .header-tunduk svg {
  animation: header-mode-pulse 900ms ease-in-out infinite;
}

.asking .header-mode-fast svg :where(path, polyline, line) {
  filter: drop-shadow(0 0 4px rgba(0, 168, 168, 0.8));
}

.asking .header-mode-thinking svg :where(path, circle, line) {
  filter: drop-shadow(0 0 4px rgba(0, 139, 139, 0.82));
}

@keyframes header-mode-pulse {
  0% { transform: translateY(0) scale(1); opacity: 1; }
  50% { transform: translateY(-1px) scale(1.05); opacity: 0.96; }
  100% { transform: translateY(0) scale(1); opacity: 1; }
}

.header-logo {
  flex: 1;
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 8px;
}

.logo-text {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--mode-accent);
  text-shadow: 0 0 14px var(--mode-accent-soft);
  position: relative;
  display: inline-block;
}

.logo-smile {
  width: 46px;
  height: 46px;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  background: rgba(255, 255, 255, 0.04);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  flex-shrink: 0;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12) inset;
  transition:
    border-color 520ms cubic-bezier(0.2, 1, 0.25, 1),
    background-color 520ms cubic-bezier(0.2, 1, 0.25, 1),
    box-shadow 520ms cubic-bezier(0.2, 1, 0.25, 1),
    filter 520ms cubic-bezier(0.2, 1, 0.25, 1);
}

.logo-smile img {
  width: 84%;
  height: 84%;
  object-fit: contain;
  filter: brightness(1.1) drop-shadow(0 0 6px rgba(107, 142, 255, 0.28));
  transition: filter 520ms cubic-bezier(0.2, 1, 0.25, 1);
}

body.light-mode .logo-smile {
  border-color: rgba(8, 14, 28, 0.13);
  background: rgba(8, 14, 28, 0.03);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.8) inset;
}

body.light-mode .logo-smile img {
  filter: brightness(0.88) saturate(1.15);
}

body.mode-fast .logo-smile,
body.mode-fast .brand-logo {
  filter: drop-shadow(0 0 6px rgba(0, 168, 168, 0.22));
}

body.mode-thinking .logo-smile,
body.mode-thinking .brand-logo {
  filter: drop-shadow(0 0 6px rgba(0, 139, 139, 0.24));
}

body.mode-fast .logo-smile svg,
body.mode-fast .brand-logo svg {
  filter: drop-shadow(0 0 4px rgba(0, 168, 168, 0.35));
}

body.mode-thinking .logo-smile svg,
body.mode-thinking .brand-logo svg {
  filter: drop-shadow(0 0 4px rgba(0, 139, 139, 0.36));
}

.asking .logo-smile {
  animation: logo-smile-pulse 1.2s ease-in-out infinite;
  filter: drop-shadow(0 0 10px var(--mode-accent-soft));
}

@keyframes logo-smile-pulse {
  0%, 100% { transform: translateY(0) scale(1); opacity: 1; }
  50% { transform: translateY(-1px) scale(1.04); opacity: 0.96; }
}

.logo-text::after {
  content: attr(data-text);
  position: absolute;
  inset: 0;
  pointer-events: none;
  color: transparent;
  background: linear-gradient(
    90deg,
    rgba(255, 255, 255, 0) 0%,
    rgba(255, 255, 255, 0) 30%,
    rgba(255, 255, 255, 0.95) 50%,
    rgba(255, 255, 255, 0) 70%,
    rgba(255, 255, 255, 0) 100%
  );
  background-size: 220% 100%;
  background-position: 0% 0%;
  -webkit-background-clip: text;
  background-clip: text;
  filter: drop-shadow(0 0 10px var(--mode-accent-soft));
  opacity: 0;
}

.asking .logo-text::after {
  opacity: 1;
  animation: logo-sheen 1.2s ease-in-out infinite;
}

@keyframes logo-sheen {
  0% { background-position: 0% 0%; }
  100% { background-position: 100% 0%; }
}


.header-right {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 120px;
  justify-content: flex-end;
}

.icon-btn {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-soft);
  background: var(--surface-1);
  color: var(--text-secondary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease;
}

/* Header switch button to IDE */
.ide-switch-btn {
  width: auto;
  padding: 0 14px;
  gap: 6px;
  text-decoration: none;
  font-weight: 600;
  font-size: 13px;
}

.ide-switch-btn svg {
  color: var(--mode-accent);
}

.icon-btn:hover { background: var(--surface-2); color: var(--text-primary); }
.icon-btn:active { background: var(--surface-3); }

.close-btn {
  display: none;
  position: absolute;
  top: 14px;
  right: 14px;
}

#chat-container {
  flex: 1;
  width: 100%;
  max-width: 760px;
  margin: 0 auto;
  padding: 28px 16px 10px;
  overflow-y: auto;
  overflow-x: hidden;
}

.welcome-screen {
  min-height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 32px;
  padding: 34px 0 72px;
}

.welcome-screen .welcome-badge,
.welcome-screen .welcome-tunduk,
.welcome-screen .welcome-title,
.welcome-screen .welcome-subtitle,
.welcome-screen .input-box,
.welcome-screen .welcome-cards {
  opacity: 0;
  transform: translateY(10px);
  animation: welcome-stagger-in var(--motion-slow) var(--ease-out) forwards;
}

.welcome-screen .welcome-badge { animation-delay: 40ms; }
.welcome-screen .welcome-tunduk { animation-delay: 95ms; }
.welcome-screen .welcome-title { animation-delay: 150ms; }
.welcome-screen .welcome-subtitle { animation-delay: 210ms; }
.welcome-screen .input-box { animation-delay: 270ms; }
.welcome-screen .welcome-cards { animation-delay: 330ms; }

.welcome-screen .welcome-card {
  opacity: 0;
  transform: translateY(6px);
  animation: welcome-card-in var(--motion-base) var(--ease-out) forwards;
}

.welcome-screen .welcome-card:nth-child(1) { animation-delay: 380ms; }
.welcome-screen .welcome-card:nth-child(2) { animation-delay: 430ms; }
.welcome-screen .welcome-card:nth-child(3) { animation-delay: 480ms; }
.welcome-screen .welcome-card:nth-child(4) { animation-delay: 530ms; }

@keyframes welcome-stagger-in {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes welcome-card-in {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.welcome-logo {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}

.welcome-tunduk {
  width: 54px;
  height: 54px;
}

.welcome-tunduk svg {
  width: 54px;
  height: 54px;
}

.welcome-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  color: var(--text-secondary);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  font-size: 13px;
}

.welcome-title {
  font-size: 56px;
  line-height: 1.1;
  letter-spacing: -0.03em;
  font-weight: 600;
}

.welcome-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  text-align: center;
  max-width: 760px;
}

.welcome-hints {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin-top: 10px;
}

.welcome-hint {
  font-size: 12px;
  color: var(--text-secondary);
  border: 1px solid var(--glass-border);
  background: var(--glass-bg);
  border-radius: var(--radius-pill);
  padding: 6px 10px;
}

.welcome-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  width: 100%;
  max-width: 720px;
}

.welcome-card {
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-pill);
  background: var(--glass-bg);
  padding: 10px 18px;
  color: var(--text-secondary);
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  cursor: pointer;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.welcome-card:hover { background: var(--glass-bg-hover); border-color: var(--glass-border-hover); color: var(--text-primary); }
.welcome-card:active { background: var(--glass-bg-active); }
.welcome-card-icon { color: inherit; display: inline-flex; }
.welcome-card-text { line-height: 1.4; }
.welcome-screen.hidden { display: none; }

/* light-mode welcome-hint/welcome-card — handled by --glass-* variables */

.input-area {
  display: flex;
  justify-content: center;
  width: 100%;
}

.input-wrapper {
  width: 100%;
  max-width: 760px;
  padding: 6px 16px 8px;
  background: transparent;
}

.input-box {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  border-radius: 22px;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  padding: 12px 11px 7px 13px;
  max-width: 720px;
  margin: 0 auto;
  overflow: visible;
  transition: background var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.input-box:focus-within {
  border-color: var(--accent-soft);
}

body.mode-thinking .input-box:focus-within {
  border-color: var(--accent);
}

.send-btn.send-active {
  position: relative;
}

.send-btn.send-active::before {
  content: "";
  position: absolute;
  inset: -6px;
  border-radius: inherit;
  pointer-events: none;
  background: conic-gradient(
    from 180deg,
    rgba(107, 142, 255, 0) 0deg,
    rgba(107, 142, 255, 0.55) 70deg,
    rgba(107, 142, 255, 0.18) 160deg,
    rgba(107, 142, 255, 0) 360deg
  );
  animation: send-stream-rotate 950ms linear infinite;
  z-index: -1;
  mask: radial-gradient(circle at center, transparent 58%, #000 60%);
}

.send-btn.send-active::after {
  content: "";
  position: absolute;
  inset: -12px;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(circle at center, rgba(107, 142, 255, 0.18), transparent 62%);
  animation: send-stream-pulse 1.25s ease-in-out infinite;
  z-index: -2;
}

@keyframes send-stream-rotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

@keyframes send-stream-pulse {
  0% { opacity: 0.35; transform: scale(1); }
  50% { opacity: 0.55; transform: scale(1.02); }
  100% { opacity: 0.35; transform: scale(1); }
}

.chat-input {
  width: 100%;
  min-height: 48px;
  max-height: 200px;
  resize: none;
  border: none;
  background: transparent;
  color: var(--text-primary);
  font-family: var(--font-sans);
  font-size: 15px;
  line-height: 1.5;
  outline: none;
  padding: 7px 4px 2px 2px;
  display: block;
  box-sizing: border-box;
}

.chat-input {
  scrollbar-width: thin;
  scrollbar-color: var(--scrollbar-thumb) transparent;
}

.chat-input::-webkit-scrollbar {
  width: 8px;
}

.chat-input::-webkit-scrollbar-track {
  background: transparent;
}

.chat-input::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 999px;
}

.chat-input::-webkit-scrollbar-thumb:hover {
  background: var(--scrollbar-thumb-hover);
}

.chat-input::placeholder {
  color: var(--text-muted);
}

.input-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  flex-shrink: 0;
  margin: -3px 0 0;
  padding: 3px 0 2px;
  min-height: 38px;
}

.input-controls-left,
.input-controls-right {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.input-controls-right {
  margin-left: auto;
}

.attach-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  width: auto;
  min-width: 0;
  height: 34px;
  min-height: 34px;
  padding: 0 12px 0 10px;
  flex-shrink: 0;
  border: 1px solid var(--border-soft);
  background: var(--surface-2);
  color: var(--text-secondary);
}

.attach-btn svg {
  width: 19px;
  height: 19px;
  flex-shrink: 0;
}

.attach-btn svg :where(path, line, polyline, circle, rect) {
  stroke-width: 2.45px;
}

.attach-soon {
  font-size: 11px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.02em;
  line-height: 1;
  white-space: nowrap;
}

.attach-btn:hover {
  background: var(--surface-3);
  color: var(--text-primary);
}

.attach-btn:hover .attach-soon {
  color: var(--text-secondary);
}

.attach-btn:active {
  background: var(--surface-3);
}

.attach-btn:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.input-box.input-box--expanded {
  border-radius: var(--radius-lg);
  padding-top: 12px;
  padding-bottom: 7px;
}

.mode-selector-compact {
  position: relative;
}

.mode-trigger {
  height: 32px;
  min-height: 32px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  color: var(--text-secondary);
  padding: 0 11px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  cursor: pointer;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease;
  font-size: 13px;
  font-weight: 500;
  flex-shrink: 0;
}

.mode-trigger:hover { background: var(--surface-3); color: var(--text-primary); }
.mode-trigger:active { background: var(--surface-3); }
.mode-trigger.fast,
.mode-trigger.thinking { color: var(--text-primary); }

.mode-trigger.fast #mode-trigger-icon svg,
.mode-option[data-mode="fast"] .option-icon svg {
  color: var(--mode-accent);
}

.mode-trigger.thinking #mode-trigger-icon svg,
.mode-option[data-mode="thinking"] .option-icon svg {
  color: var(--mode-accent);
}

body.light-mode .mode-trigger #mode-trigger-icon svg,
body.light-mode .mode-option .option-icon svg,
body.light-mode .header-tunduk svg,
body.light-mode .logo-smile svg {
  filter: drop-shadow(0 0 0.8px rgba(8, 14, 28, 0.18));
}

.chevron {
  opacity: 0.7;
  transition: transform var(--motion-fast) ease;
}

.mode-trigger.open .chevron {
  transform: rotate(180deg);
}

.send-btn {
  width: 32px;
  height: 32px;
  min-height: 32px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: linear-gradient(180deg, #7b9dff, #6286ff 55%, #6b8eff);
  color: #fff;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.14) inset, 0 4px 16px rgba(107, 142, 255, 0.28);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--motion-fast) ease, box-shadow var(--motion-fast) ease, transform var(--motion-base) var(--ease-out);
}

/* ═══ Attachment chips (file upload preview) ═══ */
.attachments-row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 10px 14px 6px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}
.attach-chip {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 5px 6px 5px 7px;
  border: 1px solid rgba(255, 255, 255, 0.10);
  background: rgba(255, 255, 255, 0.04);
  border-radius: 10px;
  font-size: 12px;
  max-width: 260px;
  transition: background .15s ease, border-color .15s ease, transform .15s ease;
  animation: chipIn .2s var(--ease-out, ease);
}
@keyframes chipIn {
  from { opacity: 0; transform: translateY(4px) scale(.96); }
  to   { opacity: 1; transform: translateY(0) scale(1); }
}
.attach-chip:hover {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(123, 157, 255, 0.32);
}
.attach-chip[data-status="loading"] {
  border-color: rgba(123, 157, 255, 0.30);
  background: rgba(123, 157, 255, 0.06);
}
.attach-chip[data-status="error"] {
  border-color: rgba(220, 38, 38, 0.40);
  background: rgba(220, 38, 38, 0.08);
}
.attach-chip .chip-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(180deg, rgba(123, 157, 255, 0.20), rgba(123, 157, 255, 0.10));
  border: 1px solid rgba(123, 157, 255, 0.28);
  border-radius: 8px;
  color: #a9c0ff;
}
.attach-chip .chip-icon svg { width: 15px; height: 15px; display: block; }
.attach-chip[data-status="loading"] .chip-icon { animation: spin 1s linear infinite; }
.attach-chip[data-status="error"] .chip-icon {
  background: linear-gradient(180deg, rgba(220,38,38,.25), rgba(220,38,38,.10));
  border-color: rgba(220,38,38,.42);
  color: #ff8b8b;
}
.attach-chip[data-image] .chip-icon { display: none; }
.attach-chip .chip-thumb {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  object-fit: cover;
  flex-shrink: 0;
  border: 1px solid rgba(255, 255, 255, 0.14);
}
.attach-chip .chip-info {
  display: flex;
  flex-direction: column;
  min-width: 0;
  flex: 1;
  line-height: 1.25;
  gap: 1px;
}
.attach-chip .chip-name {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.94);
  font-size: 12.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 180px;
  letter-spacing: -.01em;
}
.attach-chip .chip-meta {
  font-size: 10.5px;
  color: rgba(255, 255, 255, 0.50);
  white-space: nowrap;
  font-feature-settings: "tnum";
}
.attach-chip .chip-remove {
  width: 22px;
  height: 22px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: rgba(255, 255, 255, 0.45);
  cursor: pointer;
  border-radius: 7px;
  flex-shrink: 0;
  padding: 0;
  transition: background .15s ease, color .15s ease, transform .12s ease;
}
.attach-chip .chip-remove svg { width: 13px; height: 13px; display: block; }
.attach-chip .chip-remove:hover {
  background: rgba(220, 38, 38, 0.18);
  color: #ff9b9b;
}
.attach-chip .chip-remove:active { transform: scale(.88); }

@keyframes spin { from { transform: rotate(0deg); } to { transform: rotate(360deg); } }

/* Light theme */
@media (prefers-color-scheme: light) {
  .attachments-row { border-bottom-color: rgba(0, 0, 0, 0.06); }
  .attach-chip {
    border-color: rgba(0, 0, 0, 0.08);
    background: rgba(0, 0, 0, 0.02);
  }
  .attach-chip:hover { background: rgba(0, 0, 0, 0.04); border-color: rgba(107, 142, 255, 0.34); }
  .attach-chip .chip-name { color: rgba(20, 30, 50, 0.92); }
  .attach-chip .chip-meta { color: rgba(20, 30, 50, 0.55); }
  .attach-chip .chip-remove { color: rgba(20, 30, 50, 0.45); }
  .attach-chip .chip-icon {
    background: linear-gradient(180deg, rgba(107, 142, 255, 0.14), rgba(107, 142, 255, 0.06));
    border-color: rgba(107, 142, 255, 0.25);
    color: #4a6cf7;
  }
}

/* Hide old "скоро" badge if any leftovers */
.attach-soon { display: none !important; }

/* ═══ Mic button (voice input) — same system style as send-btn ═══ */
button.mic-btn,
.mic-btn {
  position: relative;
  width: 32px;
  height: 32px;
  min-height: 32px;
  flex-shrink: 0;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.10), rgba(255, 255, 255, 0.04));
  color: rgba(255, 255, 255, 0.92);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.14) inset, 0 2px 10px rgba(0, 0, 0, 0.18);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background var(--motion-fast) ease, box-shadow var(--motion-fast) ease, transform var(--motion-base) var(--ease-out);
  margin-right: 6px;
  padding: 0;
  overflow: visible;
}
.mic-btn:hover {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.16), rgba(255, 255, 255, 0.08));
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.18) inset, 0 4px 14px rgba(0, 0, 0, 0.24);
}
.mic-btn:active { transform: scale(.94); }

.mic-btn svg.mic-icon {
  width: 18px;
  height: 18px;
  display: block;
  stroke: currentColor;
  fill: none;
  flex-shrink: 0;
  transition: opacity .15s ease, transform .15s ease;
}
.mic-btn svg.mic-icon :where(path, line, rect) {
  stroke-width: 2.2px;
}

.mic-btn .mic-stop-icon {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transition: opacity .15s ease;
  pointer-events: none;
}
.mic-btn .mic-stop-icon svg {
  width: 13px;
  height: 13px;
  display: block;
  fill: currentColor;
}

/* Listening — red gradient (mirror of send-btn but red), pulsing glow */
.mic-btn.mic-listening {
  background: linear-gradient(180deg, #ff7a7a, #dc2626 55%, #c81d1d);
  border-color: rgba(255, 255, 255, 0.22);
  color: #fff;
  box-shadow:
    0 1px 0 rgba(255, 255, 255, 0.22) inset,
    0 4px 16px rgba(220, 38, 38, 0.45),
    0 0 0 0 rgba(220, 38, 38, 0.55);
  animation: mic-pulse-system 1.4s ease-in-out infinite;
}
.mic-btn.mic-listening .mic-icon { opacity: 0; transform: scale(.7); }
.mic-btn.mic-listening .mic-stop-icon { display: flex; opacity: 1; }

@keyframes mic-pulse-system {
  0%, 100% {
    box-shadow:
      0 1px 0 rgba(255, 255, 255, 0.22) inset,
      0 4px 16px rgba(220, 38, 38, 0.45),
      0 0 0 0 rgba(220, 38, 38, 0.55);
  }
  50% {
    box-shadow:
      0 1px 0 rgba(255, 255, 255, 0.22) inset,
      0 4px 16px rgba(220, 38, 38, 0.45),
      0 0 0 8px rgba(220, 38, 38, 0);
  }
}

/* Light theme: mirror send-btn with neutral mic */
@media (prefers-color-scheme: light) {
  .mic-btn {
    border-color: rgba(0, 0, 0, 0.10);
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.02), rgba(0, 0, 0, 0.05));
    color: rgba(40, 50, 70, 0.78);
    box-shadow: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 1px 4px rgba(0, 0, 0, 0.06);
  }
  .mic-btn:hover {
    background: linear-gradient(180deg, rgba(0, 0, 0, 0.04), rgba(0, 0, 0, 0.08));
    color: rgba(20, 30, 50, 0.95);
  }
}

.send-btn svg {
  width: 19px;
  height: 19px;
  flex-shrink: 0;
}

.send-btn svg :where(path, line, polyline, circle, rect) {
  stroke-width: 2.55px;
}

.send-btn:hover {
  background: linear-gradient(180deg, #87a6ff, #6b8eff);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.16) inset, 0 6px 20px rgba(107, 142, 255, 0.35);
}

.send-btn:active {
  background: linear-gradient(180deg, #6f8fff, #5d7dff);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.12) inset, 0 2px 10px rgba(107, 142, 255, 0.22);
  transform: scale(0.97);
}

.send-btn.disabled,
.send-btn:disabled {
  background: var(--surface-2);
  border-color: var(--border-soft);
  color: var(--text-muted);
  box-shadow: none;
  cursor: not-allowed;
  transform: none;
}

.send-btn.disabled svg :where(path, line, polyline, circle, rect),
.send-btn:disabled svg :where(path, line, polyline, circle, rect) {
  stroke-width: 2.2px;
  opacity: 0.55;
}

.send-active {
  opacity: 0.88;
  transform: scale(0.96);
}

.mode-dropdown {
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  width: 280px;
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 6px;
  z-index: 1000;
  animation: dropdown-in 180ms var(--ease-out);
}

@keyframes dropdown-in {
  from { opacity: 0; transform: translateY(6px); }
  to { opacity: 1; transform: translateY(0); }
}

.mode-option {
  width: 100%;
  border: none;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  background: transparent;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 10px;
  text-align: left;
  cursor: pointer;
  transition: background var(--motion-fast) ease;
}

.mode-option:hover:not(.mode-option--disabled) {
  background: var(--surface-2);
}

.mode-option:active:not(.mode-option--disabled) {
  background: var(--surface-3);
}

.mode-option--disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.option-icon { display: inline-flex; color: var(--text-secondary); }
.option-info { display: flex; flex-direction: column; gap: 2px; flex: 1; }
.option-name { font-size: 15px; font-weight: 600; line-height: 1.2; }
.option-desc { font-size: 11px; color: var(--text-muted); line-height: 1.2; }
.option-check { color: var(--accent); }

.option-soon {
  border-radius: var(--radius-pill);
  background: var(--surface-3);
  color: var(--text-muted);
  padding: 3px 9px;
  font-size: 11px;
}

.input-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 12px;
  margin-top: 5px;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.message {
  margin-bottom: 28px;
  animation: message-in var(--motion-slow) var(--ease-out);
}

.message-meta {
  margin-top: 8px;
  font-size: 11px;
  color: var(--text-muted);
  line-height: 1.2;
  user-select: none;
}

.user-message .message-meta {
  text-align: right;
  padding-right: 2px;
}

.bot-message .message-meta {
  margin-left: 0;
}

@keyframes message-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.user-message {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: flex-end;
}

.user-message .copy-btn {
  align-self: flex-end;
  margin-top: 8px;
}

.user-message .message-content {
  max-width: 75%;
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.04));
  border-radius: var(--radius-lg);
  padding: 14px 18px;
  border: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 15px;
  line-height: 1.65;
}

.bot-message {
  position: relative;
  padding-top: 58px;   /* avatar 50px + 8px gap below it */
  padding-left: 0;
}

.bot-message .message-content {
  max-width: 100%;
  background: rgba(255, 255, 255, 0.035);
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  padding: 12px 14px;
}

body.light-mode .bot-message .message-content {
  background: rgba(8, 14, 28, 0.035);
}

body.light-mode .user-message .message-content {
  background: linear-gradient(180deg, rgba(8, 14, 28, 0.055), rgba(8, 14, 28, 0.04));
  border-color: rgba(8, 14, 28, 0.13);
}

.bot-message::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 50px;
  height: 50px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background-color: rgba(255, 255, 255, 0.03);
  background-image: url("/logo/Logo_transparent.png?v=2");
  background-size: 80%;
  background-position: center;
  background-repeat: no-repeat;
  filter: brightness(1.1) drop-shadow(0 0 6px rgba(107, 142, 255, 0.28));
  transition:
    background-color 520ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 520ms cubic-bezier(0.2, 1, 0.25, 1),
    filter 520ms cubic-bezier(0.2, 1, 0.25, 1),
    transform 520ms cubic-bezier(0.2, 1, 0.25, 1);
}

body.light-mode .header-tunduk,
body.light-mode .logo-smile {
  border-color: rgba(8, 14, 28, 0.12);
  background-color: rgba(8, 14, 28, 0.03);
}

body.light-mode .bot-message::before {
  border-color: rgba(8, 14, 28, 0.12);
  background-color: rgba(8, 14, 28, 0.03);
  filter: brightness(0.88) saturate(1.15);
}

.bot-message.bot-message--streaming::before {
  animation: bot-scales-working 1.05s ease-in-out infinite;
  transform-origin: 50% 10%;
}

.bot-message.bot-message--streaming.bot-message--fast::before {
  filter: drop-shadow(0 0 8px rgba(0, 168, 168, 0.42));
  animation: bot-scales-working 1.05s ease-in-out infinite, bot-mood-fast 2.1s ease-in-out infinite;
}

.bot-message.bot-message--streaming.bot-message--thinking::before {
  filter: drop-shadow(0 0 8px rgba(0, 139, 139, 0.45));
  animation: bot-scales-working 1.05s ease-in-out infinite, bot-mood-thinking 2.2s ease-in-out infinite;
}

@keyframes bot-mood-fast {
  0%, 100% { filter: drop-shadow(0 0 6px rgba(0, 168, 168, 0.32)); }
  50% { filter: drop-shadow(0 0 10px rgba(0, 168, 168, 0.48)); }
}

@keyframes bot-mood-thinking {
  0%, 100% { filter: drop-shadow(0 0 6px rgba(0, 139, 139, 0.36)); }
  50% { filter: drop-shadow(0 0 11px rgba(0, 139, 139, 0.52)); }
}

@keyframes bot-scales-working {
  0%, 100% { transform: rotate(0deg); opacity: 1; }
  25% { transform: rotate(-3deg); opacity: 0.95; }
  50% { transform: rotate(0deg) scale(1.03); opacity: 0.98; }
  75% { transform: rotate(3deg); opacity: 0.95; }
}

.streaming-cursor {
  display: inline-block;
  width: 8px;
  height: 16px;
  background-color: currentColor;
  border-radius: 2px;
  margin-left: 4px;
  vertical-align: middle;
  animation: blink-cursor 1s step-end infinite;
}

@keyframes blink-cursor {
  0%, 100% { opacity: 1; }
  50% { opacity: 0; }
}

.asking .brand-logo svg,
.asking .header-tunduk svg,
.asking .welcome-tunduk svg {
  animation: scale-sway 1.1s ease-in-out infinite;
  transform-origin: 50% 10%;
}

@keyframes scale-sway {
  0%, 100% { transform: rotate(0deg); opacity: 1; }
  25% { transform: rotate(-4deg); opacity: 0.95; }
  75% { transform: rotate(4deg); opacity: 0.95; }
}

.message-content {
  font-size: 16px;
  line-height: 1.72;
}

.message-content p { margin-bottom: 14px; }
.message-content p:last-child { margin-bottom: 0; }
.message-content h1 { font-size: 24px; margin: 24px 0 10px; font-weight: 600; }
.message-content h2 { font-size: 20px; margin: 20px 0 8px; font-weight: 600; }
.message-content h3 { font-size: 18px; margin: 18px 0 8px; font-weight: 600; }
.message-content ul,
.message-content ol { margin: 0 0 14px 22px; }

.message-content pre {
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-md);
  padding: 14px;
  margin: 14px 0;
  overflow-x: auto;
}

.message-content code {
  font-family: var(--font-mono);
  font-size: 13px;
}

.message-content p code,
.message-content li code {
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  padding: 2px 6px;
}

.message-content blockquote {
  margin: 14px 0;
  padding: 10px 14px;
  border-left: 3px solid var(--accent-soft);
  color: var(--text-secondary);
  background: rgba(107, 142, 255, 0.06);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.legal-cite {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.045), color-mix(in srgb, var(--mode-accent-soft) 48%, rgba(255, 255, 255, 0.03)));
  color: var(--text-primary);
  border: 1px solid color-mix(in srgb, var(--mode-accent-soft) 70%, rgba(255, 255, 255, 0.1));
  border-radius: 999px;
  padding: 2px 7px;
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.07) inset;
  transition:
    background-color 360ms cubic-bezier(0.2, 1, 0.25, 1),
    border-color 360ms cubic-bezier(0.2, 1, 0.25, 1),
    color 260ms cubic-bezier(0.2, 1, 0.25, 1);
}

body.light-mode .legal-cite {
  background: linear-gradient(180deg, rgba(8, 14, 28, 0.04), color-mix(in srgb, var(--mode-accent-soft) 46%, rgba(8, 14, 28, 0.025)));
  border-color: color-mix(in srgb, var(--mode-accent-soft) 62%, rgba(8, 14, 28, 0.16));
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.22) inset;
}

.protocol-status-container {
  display: none;
  align-items: center;
  gap: 10px;
  background: var(--surface-1);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  padding: 8px 16px;
  margin: 6px 0 12px 34px;
  width: fit-content;
  max-width: 100%;
}

.thinking-timeline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-right: 6px;
}

.timeline-step {
  width: 20px;
  height: 20px;
  border-radius: var(--radius-pill);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color 120ms ease, opacity 120ms ease, background-color 120ms ease;
}

.timeline-step.step-idle {
  color: var(--text-muted);
  opacity: 0.55;
}

.timeline-step.step-active {
  color: var(--accent);
  background: var(--accent-soft);
  animation: step-breathe 0.9s ease-in-out infinite;
}

.timeline-divider {
  width: 1px;
  height: 12px;
  background: var(--border-soft);
  opacity: 0.8;
}

.status-text {
  font-size: 13px;
  color: var(--text-secondary);
  white-space: nowrap;
}

.status-update-anim { animation: status-in var(--motion-base) var(--ease-out); }
@keyframes status-in { from { opacity: 0.6; } to { opacity: 1; } }

@keyframes pulse-opacity {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.6; }
}

@keyframes step-breathe {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.62; }
}

.skeleton-loader {
  padding-left: 34px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.skeleton-line {
  height: 10px;
  border-radius: var(--radius-pill);
  background: linear-gradient(90deg, var(--surface-1) 25%, var(--surface-2) 50%, var(--surface-1) 75%);
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.8s linear infinite;
}

.skeleton-line:nth-child(1) { width: 78%; }
.skeleton-line:nth-child(2) { width: 90%; }
.skeleton-line:nth-child(3) { width: 62%; }

@keyframes skeleton-shimmer {
  from { background-position: 100% 0; }
  to { background-position: -100% 0; }
}

.copy-btn,
.retry-thinking-btn {
  margin-top: 8px;
  height: 28px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  opacity: 0;
  transition: background var(--motion-fast) ease, opacity var(--motion-fast) ease, color var(--motion-fast) ease;
}

.quick-actions {
  display: flex;
  gap: 8px;
  margin-top: 10px;
  flex-wrap: wrap;
  opacity: 0;
  transition: opacity var(--motion-fast) ease;
}

.message:hover .quick-actions {
  opacity: 1;
}

.quick-action {
  height: 28px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.quick-action svg :where(path, line, polyline, circle, rect) {
  stroke-width: 2.5px;
}

.quick-action:hover {
  background: var(--surface-1);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.quick-action:active {
  background: var(--surface-2);
}

.quick-action:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.quick-action--more {
  display: none;
}

.doc-build-btn {
  margin-top: 8px;
  height: 30px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-secondary);
  padding: 6px 12px;
  font-size: 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  opacity: 0;
  transition: background var(--motion-fast) ease, opacity var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.doc-build-btn svg :where(path, line, polyline, circle, rect) {
  stroke-width: 2.5px;
}

.message:hover .doc-build-btn {
  opacity: 1;
}

.doc-build-btn:hover {
  background: var(--surface-1);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.doc-build-badge {
  font-size: 10px;
  color: var(--text-muted);
  border: 1px solid var(--border-soft);
  border-radius: 999px;
  padding: 2px 6px;
}

.message:hover .copy-btn,
.message:hover .retry-thinking-btn {
  opacity: 1;
}

.bot-message .copy-btn {
  margin-left: auto;
  display: inline-flex;
}

.quick-actions .copy-btn.copy-btn-inline {
  margin-top: 0;
  margin-left: 2px;
  opacity: 1;
  height: 28px;
}

.copy-btn:hover,
.retry-thinking-btn:hover {
  background: var(--surface-1);
  color: var(--text-primary);
}

/* Unified glass style for all action buttons/pills */
.icon-btn,
.game-link,
.new-chat-btn,
.attach-btn,
.mode-trigger,
.mode-option,
.quick-action,
.copy-btn,
.retry-thinking-btn,
.doc-build-btn,
.sources-title {
  background: var(--glass-bg);
  border-color: var(--glass-border);
}

.icon-btn:hover,
.game-link:hover,
.new-chat-btn:hover,
.attach-btn:hover,
.mode-trigger:hover,
.mode-option:hover:not(.mode-option--disabled),
.quick-action:hover,
.copy-btn:hover,
.retry-thinking-btn:hover,
.doc-build-btn:hover,
.sources-title:hover {
  background: var(--glass-bg-hover);
  border-color: var(--glass-border-hover);
}

.icon-btn:active,
.game-link:active,
.new-chat-btn:active,
.attach-btn:active,
.mode-trigger:active,
.mode-option:active:not(.mode-option--disabled),
.quick-action:active,
.copy-btn:active,
.retry-thinking-btn:active,
.doc-build-btn:active,
.sources-title:active {
  background: var(--glass-bg-active);
}

/* Keep send button branded, but also glassy */
.send-btn {
  border-color: var(--glass-border-hover);
  background: linear-gradient(180deg, rgba(123, 157, 255, 0.72), rgba(98, 134, 255, 0.66) 55%, rgba(107, 142, 255, 0.7));
}

.send-btn:hover {
  background: linear-gradient(180deg, rgba(135, 166, 255, 0.78), rgba(107, 142, 255, 0.72));
}

.send-btn:active {
  background: linear-gradient(180deg, rgba(111, 143, 255, 0.82), rgba(93, 125, 255, 0.76));
}

.sources-container {
  margin-top: 10px;
  border: 1px solid var(--border-soft);
  border-radius: 16px;
  background: var(--surface-1);
  overflow: hidden;
}

.sources-title {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  font-size: 12px;
  color: var(--text-secondary);
  cursor: pointer;
  border: none;
  background: transparent;
  text-align: left;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease;
}

.sources-title:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

.sources-title:active {
  background: var(--surface-3);
}

.sources-title-left,
.sources-title-right {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sources-title-icon {
  width: 22px;
  height: 22px;
  border-radius: 999px;
  border: 1px solid var(--border-soft);
  background: var(--surface-2);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--accent);
  flex-shrink: 0;
}

.sources-count {
  font-size: 12px;
  font-weight: 600;
  color: var(--text-primary);
  background: var(--surface-2);
  border: 1px solid var(--border-soft);
  padding: 4px 8px;
  border-radius: 999px;
}

.sources-chevron {
  opacity: 0.7;
  transition: transform var(--motion-fast) ease;
}

.sources-container.expanded .sources-chevron {
  transform: rotate(180deg);
}

.sources-list {
  display: none;
  border-top: 1px solid var(--border-soft);
  padding: 10px 12px 12px;
}

.sources-container.expanded .sources-list {
  display: grid;
  gap: 8px;
}

.source-item {
  padding: 10px 10px;
  border-radius: 12px;
  border: 1px solid var(--border-soft);
  background: var(--surface-2);
  color: var(--text-secondary);
  font-size: 12px;
  line-height: 1.45;
  transition: background var(--motion-fast) ease, color var(--motion-fast) ease, border-color var(--motion-fast) ease;
}

.source-item:hover {
  background: var(--surface-3);
  color: var(--text-primary);
  border-color: var(--glass-border);
}

.source-text {
  word-break: break-word;
}

.source-link {
  color: inherit;
  text-decoration: none;
  word-break: break-word;
}

/* ════════════════════════════════════════════════════════════
   Расширенные карточки источников (с metadata.full_text)
   ════════════════════════════════════════════════════════════ */
.source-item-rich {
  padding: 0;
  overflow: hidden;
}
.source-item-header {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 10px 12px;
  background: transparent;
  border: none;
  cursor: pointer;
  text-align: left;
  font: inherit;
  color: inherit;
  transition: background var(--motion-fast) ease;
}
.source-item-header:hover {
  background: var(--surface-3);
}
.source-item-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  opacity: 0.75;
}
.source-item-title {
  flex: 1;
  min-width: 0;
  font-size: 12.5px;
  line-height: 1.35;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.source-item-title strong {
  font-weight: 600;
}
.source-item-art {
  color: var(--text-secondary);
  font-weight: 500;
}
.source-item-chev {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  opacity: 0.5;
  transition: transform var(--motion-fast) ease, opacity var(--motion-fast) ease;
}
.source-item-rich.is-open .source-item-chev {
  transform: rotate(180deg);
  opacity: 0.9;
}
.source-item-preview {
  display: none !important;
}
.source-item-body {
  display: none;
  padding: 0 12px 12px 36px;
  border-top: 1px solid var(--border-soft);
  margin-top: 0;
  background: rgba(0,0,0,0.02);
}
body.light-mode .source-item-body {
  background: rgba(0,0,0,0.015);
}
.source-item-rich.is-open .source-item-body {
  display: block;
  animation: src-fade-in .15s ease;
}
@keyframes src-fade-in { from { opacity: 0; } to { opacity: 1; } }
.source-item-text {
  font-family: 'Newsreader', Georgia, serif;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-primary);
  white-space: pre-wrap;
  word-break: break-word;
  margin-top: 10px;
}

.source-link:hover {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.sources-title:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 2px;
}

.message.error .message-content {
  border: 1px solid rgba(217, 107, 107, 0.55);
  background: rgba(217, 107, 107, 0.08);
}

#sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.5);
  z-index: 999;
  display: none;
}

#sidebar-overlay.active { display: block; }

.mode-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.45);
  z-index: 999;
}

.jump-to-bottom-btn {
  position: fixed;
  right: 18px;
  bottom: 84px;
  z-index: 1010;
  height: 34px;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  background: var(--surface-1);
  color: var(--text-secondary);
  padding: 0 12px;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  cursor: pointer;
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity var(--motion-fast) ease, transform var(--motion-fast) ease, background var(--motion-fast) ease, color var(--motion-fast) ease;
}

.jump-to-bottom-btn.visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

.jump-to-bottom-btn:hover {
  background: var(--surface-2);
  color: var(--text-primary);
}

#chat-container::-webkit-scrollbar,
.history-container::-webkit-scrollbar {
  width: 6px;
}

#chat-container::-webkit-scrollbar-track,
.history-container::-webkit-scrollbar-track {
  background: transparent;
}

#chat-container::-webkit-scrollbar-thumb,
.history-container::-webkit-scrollbar-thumb {
  background: transparent;
  border-radius: var(--radius-pill);
}

#chat-container:hover::-webkit-scrollbar-thumb,
.history-container:hover::-webkit-scrollbar-thumb {
  background: var(--border-strong);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.chat-input:focus-visible {
  outline: none;
}

@media (max-width: 768px) {
  .orb-1 { width: 420px; height: 420px; filter: blur(56px); opacity: 0.34; }
  .orb-2 { width: 360px; height: 360px; filter: blur(56px); opacity: 0.26; }
  .orb-3 { display: none; }
  .bg-orbs::after { display: none; }

  .app-layout {
    min-height: 100%;
    height: 100%;
  }

  .sidebar {
    width: 294px;
    padding: 18px 14px;
    border-right: 1px solid var(--border-soft);
    overflow: visible;
    position: fixed;
    left: 0;
    top: 0;
    height: 100dvh;
    transform: translateX(-100%);
    visibility: hidden;
    z-index: 1001;
    background: var(--surface-1);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.25);
    transition: transform var(--motion-slow) var(--ease-out), visibility var(--motion-slow) var(--ease-out);
  }
  body.sidebar-collapsed .sidebar {
    width: 294px;
    padding: 18px 14px;
    border-right: 1px solid var(--border-soft);
    overflow: visible;
    position: fixed;
    left: 0;
    top: 0;
    height: 100dvh;
    transform: translateX(-100%);
    visibility: hidden;
    z-index: 1001;
    background: var(--surface-1);
    box-shadow: 10px 0 30px rgba(0, 0, 0, 0.25);
    transition: transform var(--motion-slow) var(--ease-out), visibility var(--motion-slow) var(--ease-out);
  }

  .sidebar.open,
  body.sidebar-collapsed .sidebar.open {
    transform: translateX(0);
    visibility: visible;
  }
  .close-btn { display: inline-flex; }
  .sidebar-collapse-btn { display: none; }
  .sidebar-expand-btn { display: none; }
  .input-controls {
    margin: -2px 0 0;
    padding: 3px 0 2px;
    gap: 8px;
    min-height: 40px;
  }
  .icon-btn,
  .send-btn {
    width: 36px;
    height: 36px;
    min-height: 36px;
    border-radius: 999px;
  }
  .attach-btn {
    width: auto;
    height: 36px;
    min-height: 36px;
    padding: 0 13px 0 11px;
    border-radius: 999px;
  }
  .attach-btn svg {
    width: 20px;
    height: 20px;
  }
  .attach-btn svg :where(path, line, polyline, circle, rect) {
    stroke-width: 2.55px;
  }
  .mode-trigger {
    height: 36px;
    min-height: 36px;
    border-radius: 999px;
    padding: 0 10px;
    font-size: 13px;
  }
  .new-chat-btn,
  .copy-btn,
  .retry-thinking-btn,
  .welcome-card,
  .history-item,
  .mode-option {
    border-radius: 999px;
  }
  .input-box {
    border-radius: 20px;
    padding: 10px 11px 6px 12px;
  }
  .input-box.input-box--expanded {
    padding-top: 10px;
    padding-bottom: 6px;
  }
  .chat-input {
    min-height: 46px;
    font-size: 15px;
    padding: 7px 4px 2px 1px;
  }
  .header-left { min-width: 100px; }
  .header-right { min-width: 86px; }
  .ide-btn-text { display: none; }
  .ide-switch-btn { width: 36px; padding: 0; }
  .header-logo { display: none; }
  .welcome-title { font-size: 36px; }
  .welcome-subtitle { font-size: 16px; }
  .welcome-tunduk,
  .welcome-tunduk svg { width: 46px; height: 46px; }
  .welcome-cards { grid-template-columns: 1fr; max-width: 100%; }
  .input-wrapper {
    max-width: 100%;
    padding: 6px 16px calc(10px + env(safe-area-inset-bottom));
  }

  .mode-selector-compact { position: static; }
  .mode-dropdown {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    width: auto;
    border-radius: 20px 20px 0 0;
    padding: 14px 12px calc(14px + env(safe-area-inset-bottom));
    border-top: 1px solid var(--border-strong);
    box-shadow: 0 -18px 44px rgba(0, 0, 0, 0.38);
    z-index: 1002;
    max-height: min(68dvh, 520px);
    overflow-y: auto;
    overscroll-behavior: contain;
  }
  .mode-dropdown::before {
    content: "";
    position: absolute;
    top: 7px;
    left: 50%;
    transform: translateX(-50%);
    width: 42px;
    height: 4px;
    border-radius: 999px;
    background: var(--border-strong);
    opacity: 0.85;
  }

  .copy-btn,
  .retry-thinking-btn,
  .quick-action,
  .doc-build-btn {
    opacity: 1;
    min-height: 40px;
    height: 40px;
    padding: 0 12px;
  }
}

@media (max-width: 480px) {
  #chat-container { padding: 20px 12px 8px; }
  .message {
    margin-bottom: 22px;
  }
  .message-meta {
    margin-top: 6px;
    font-size: 10px;
  }
  .user-message .message-content {
    max-width: 84%;
    padding: 12px 14px;
    font-size: 14px;
    line-height: 1.58;
  }
  .bot-message {
    padding-top: 52px;  /* avatar 44px + 8px gap */
    padding-left: 0;
  }
  .bot-message::before {
    width: 44px;
    height: 44px;
    top: 0;
    background-size: 80%;
  }
  .bot-message .message-content {
    max-width: 100%;
    padding: 11px 12px;
  }
  .bot-message .message-meta {
    margin-left: 0;
  }
  .message-content {
    font-size: 15px;
    line-height: 1.64;
  }
  .message-content p {
    margin-bottom: 12px;
  }
  .message-content ul,
  .message-content ol {
    margin: 0 0 12px 18px;
  }
  .input-box { padding: 10px 10px 6px 11px; border-radius: 18px; }
  .input-box.input-box--expanded {
    padding-top: 10px;
    padding-bottom: 6px;
  }
  .chat-input { font-size: 14px; min-height: 44px; padding: 7px 3px 2px 1px; }
  .input-controls { margin: -2px 0 0; padding: 3px 0 2px; gap: 8px; min-height: 40px; }
  .icon-btn,
  .send-btn,
  .attach-btn,
  .mode-trigger,
  .new-chat-btn,
  .copy-btn,
  .retry-thinking-btn,
  .quick-action,
  .doc-build-btn { min-height: 44px; }
  .icon-btn,
  .send-btn { width: 44px; height: 44px; }
  .ide-switch-btn { width: 44px; padding: 0; }
  .attach-btn {
    width: auto;
    height: 44px;
    padding: 0 12px 0 10px;
  }
  .attach-btn svg {
    width: 20px;
    height: 20px;
  }
  .attach-btn svg :where(path, line, polyline, circle, rect) {
    stroke-width: 2.55px;
  }
  .mode-trigger { height: 44px; }
  .mode-dropdown {
    max-height: min(72dvh, 540px);
    padding-top: 16px;
  }
  .copy-btn,
  .retry-thinking-btn,
  .quick-action,
  .doc-build-btn {
    height: 44px;
    padding: 0 12px;
    font-size: 12px;
  }
  .copy-btn,
  .quick-action,
  .doc-build-btn {
    width: 44px;
    min-width: 44px;
    padding: 0;
    justify-content: center;
    gap: 0;
    font-size: 0;
  }
  .copy-btn svg,
  .quick-action svg,
  .doc-build-btn svg {
    width: 18px;
    height: 18px;
  }
  .quick-actions .copy-btn.copy-btn-inline {
    height: 44px;
    margin-left: 4px;
  }
  .quick-actions {
    gap: 6px;
    margin-top: 8px;
  }
  .doc-build-btn {
    margin-top: 6px;
  }
  .doc-build-badge {
    display: none;
  }
  .sources-container {
    margin-top: 8px;
    border-radius: 14px;
  }
  .sources-title {
    padding: 10px;
  }
  .sources-list {
    padding: 8px 10px 10px;
    gap: 6px;
  }
  .source-item {
    padding: 9px 9px;
    border-radius: 10px;
  }
  .quick-actions.mobile-collapsed .quick-action[data-action="document"] {
    display: none;
  }
  .quick-actions.mobile-collapsed-tight .quick-action[data-action="plan"] {
    display: none;
  }
  .quick-actions.mobile-collapsed .quick-action--more {
    display: inline-flex;
  }
  .quick-actions.mobile-collapsed.expanded .quick-action[data-action="document"] {
    display: inline-flex;
  }
  .quick-actions.mobile-collapsed-tight.expanded .quick-action[data-action="plan"] {
    display: inline-flex;
  }
  .quick-actions.mobile-collapsed.expanded .quick-action--more {
    display: inline-flex;
  }
  .retry-thinking-btn {
    display: none;
  }
  .message .quick-actions,
  .message .copy-btn,
  .message .doc-build-btn,
  .message .retry-thinking-btn {
    opacity: 0;
    pointer-events: none;
    transform: translateY(4px);
    transition: opacity var(--motion-fast) ease, transform var(--motion-fast) ease;
  }
  .message.message-actions-open .quick-actions,
  .message.message-actions-open .copy-btn,
  .message.message-actions-open .doc-build-btn,
  .message.message-actions-open .retry-thinking-btn {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }
  .welcome-hints .welcome-hint:nth-child(3) {
    display: none;
  }

  .jump-to-bottom-btn {
    min-height: 44px;
    height: 44px;
    padding: 0 14px;
    right: 12px;
    bottom: calc(96px + env(safe-area-inset-bottom));
  }
}

@media (max-width: 360px) {
  .header-status-dot {
    display: none;
  }
  .header-left {
    min-width: 84px;
    gap: 8px;
  }
  .message-content {
    font-size: 14px;
    line-height: 1.58;
  }
  .message-meta {
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }

  .send-btn,
  .send-btn:active,
  .send-active {
    transform: none !important;
  }
}