:root {
  --bg: #0f0e1a;
  --bg-soft: #17152780;
  --bg-elevated: #1c1a2e;
  --bg-elevated-2: #242138;
  --text: #f3f1f9;
  --text-dim: #9d97b8;
  --border: #322e4a;
  --shadow: 0 8px 24px -8px rgba(0, 0, 0, 0.5);

  --darija: #e08a5c;
  --darija-2: #c85f3a;
  --wolof: #6e7fee;
  --wolof-2: #4a56c9;
  --tahitien: #2fc4bb;
  --tahitien-2: #1f9a92;

  --accent: var(--darija);
  --accent-2: var(--darija-2);

  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #faf9fd;
  --bg-soft: #ffffffb0;
  --bg-elevated: #ffffff;
  --bg-elevated-2: #f1eff8;
  --text: #211f2e;
  --text-dim: #6d6884;
  --border: #e3e0ee;
  --shadow: 0 8px 24px -10px rgba(40, 30, 80, 0.18);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #faf9fd;
    --bg-soft: #ffffffb0;
    --bg-elevated: #ffffff;
    --bg-elevated-2: #f1eff8;
    --text: #211f2e;
    --text-dim: #6d6884;
    --border: #e3e0ee;
    --shadow: 0 8px 24px -10px rgba(40, 30, 80, 0.18);
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}

html, body {
  height: 100%;
  overscroll-behavior-y: none;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background:
    radial-gradient(60vw 40vh at 15% -5%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 60%),
    radial-gradient(50vw 35vh at 100% 0%, color-mix(in srgb, var(--tahitien) 10%, transparent), transparent 60%),
    var(--bg);
  color: var(--text);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior-y: none;
}

.app {
  max-width: 640px;
  margin: 0 auto;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 max(1rem, env(safe-area-inset-right)) env(safe-area-inset-bottom) max(1rem, env(safe-area-inset-left));
}

.status-bar-spacer {
  height: env(safe-area-inset-top);
  flex-shrink: 0;
}

.app-header {
  position: sticky;
  top: 0;
  z-index: 5;
  padding: 0.85rem 0 0.6rem;
  background: linear-gradient(to bottom, var(--bg) 65%, transparent);
  transition: padding 0.2s ease;
}

.app-header.scrolled {
  padding: 0.5rem 0 0.4rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  transition: gap 0.2s ease;
}

.brand-mark {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  box-shadow: var(--shadow);
  transition: background 0.25s ease, width 0.2s ease, height 0.2s ease;
  flex-shrink: 0;
}

.app-header.scrolled .brand-mark {
  width: 30px;
  height: 30px;
  border-radius: 9px;
}

.app-header.scrolled .brand-mark svg {
  width: 16px;
  height: 16px;
}

.app-header h1 {
  margin: 0;
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  transition: font-size 0.2s ease;
}

.app-header.scrolled h1 {
  font-size: 1.05rem;
}

.subtitle {
  margin: 0.1rem 0 0;
  color: var(--text-dim);
  font-size: 0.78rem;
  letter-spacing: 0.02em;
  transition: opacity 0.2s ease, height 0.2s ease, margin 0.2s ease;
  overflow: hidden;
}

.app-header.scrolled .subtitle {
  opacity: 0;
  height: 0;
  margin: 0;
}

.controls {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0 0.85rem;
  flex-wrap: wrap;
}

.lang-picker,
.register-toggle {
  display: flex;
  gap: 0.35rem;
  padding: 0.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 999px;
  box-shadow: var(--shadow);
}

.lang-pill,
.register-option {
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  gap: 0.4rem;
  border: none;
  background: transparent;
  color: var(--text-dim);
  border-radius: 999px;
  padding: 0.4rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  transition: background 0.18s ease, color 0.18s ease, transform 0.1s ease;
}

.lang-pill:hover,
.register-option:hover {
  color: var(--text);
}

.lang-pill:active,
.register-option:active {
  transform: scale(0.96);
}

.lang-pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: currentColor;
  opacity: 0.5;
}

.lang-pill[data-lang="darija"] { color: var(--darija); }
.lang-pill[data-lang="wolof"] { color: var(--wolof); }
.lang-pill[data-lang="tahitien"] { color: var(--tahitien); }

.lang-pill[data-lang="darija"].active { background: linear-gradient(135deg, var(--darija), var(--darija-2)); color: #fff; }
.lang-pill[data-lang="wolof"].active { background: linear-gradient(135deg, var(--wolof), var(--wolof-2)); color: #fff; }
.lang-pill[data-lang="tahitien"].active { background: linear-gradient(135deg, var(--tahitien), var(--tahitien-2)); color: #fff; }

.lang-pill.active .dot {
  background: #fff;
  opacity: 0.9;
}

.register-option.active {
  background: var(--text);
  color: var(--bg);
}

.chat {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 0.5rem 0.1rem 1rem;
  scroll-behavior: smooth;
}

.empty-state {
  margin: auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.75rem;
  text-align: center;
  color: var(--text-dim);
  font-size: 0.9rem;
  padding: 2rem;
  max-width: 22rem;
}

.empty-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 56px;
  height: 56px;
  border-radius: 16px;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--accent);
}

.bubble {
  max-width: 80%;
  padding: 0.7rem 0.95rem;
  border-radius: 1.15rem;
  line-height: 1.45;
  font-size: 0.95rem;
  word-wrap: break-word;
  box-shadow: var(--shadow);
}

.bubble.source {
  align-self: flex-end;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-bottom-right-radius: 0.35rem;
  box-shadow: none;
}

.bubble.result {
  align-self: flex-start;
  color: #fff;
  border-bottom-left-radius: 0.35rem;
}

.bubble.result.darija { background: linear-gradient(135deg, var(--darija), var(--darija-2)); }
.bubble.result.wolof { background: linear-gradient(135deg, var(--wolof), var(--wolof-2)); }
.bubble.result.tahitien { background: linear-gradient(135deg, var(--tahitien), var(--tahitien-2)); }

.bubble.result.pending {
  opacity: 0.75;
}

.bubble.result.pending::after {
  content: "";
  display: inline-block;
  width: 0.4em;
}

.bubble.result.error {
  background: #a8433f;
  font-size: 0.85rem;
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 0.5rem;
  padding: 0.75rem 0 calc(0.9rem + env(safe-area-inset-bottom));
}

.composer textarea {
  flex: 1;
  resize: none;
  max-height: 6rem;
  padding: 0.7rem 1rem;
  border-radius: 1.3rem;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  font-size: 0.95rem;
  font-family: inherit;
  box-shadow: var(--shadow);
}

.composer textarea::placeholder {
  color: var(--text-dim);
}

.composer textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 25%, transparent);
}

.composer button {
  position: relative;
  overflow: hidden;
  flex-shrink: 0;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  user-select: none;
  touch-action: manipulation;
  box-shadow: var(--shadow);
  transition: transform 0.12s ease, opacity 0.15s ease;
}

.composer button:hover:not(:disabled) {
  transform: translateY(-1px) scale(1.03);
}

.composer button:active:not(:disabled) {
  transform: scale(0.94);
}

.composer button:disabled {
  opacity: 0.5;
  cursor: default;
}

@media (prefers-reduced-motion: no-preference) {
  .bubble {
    animation: rise 0.22s cubic-bezier(0.2, 0.8, 0.3, 1);
  }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(8px) scale(0.98); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.ripple {
  position: absolute;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.45);
  transform: scale(0);
  pointer-events: none;
  animation: ripple-anim 480ms ease-out;
}

:root[data-theme="light"] .lang-pill:not(.active) .ripple,
:root[data-theme="light"] .register-option:not(.active) .ripple {
  background: rgba(30, 25, 60, 0.12);
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) .lang-pill:not(.active) .ripple,
  :root:not([data-theme="dark"]) .register-option:not(.active) .ripple {
    background: rgba(30, 25, 60, 0.12);
  }
}

@keyframes ripple-anim {
  to {
    transform: scale(2.6);
    opacity: 0;
  }
}

::-webkit-scrollbar {
  width: 8px;
}

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