/* ============================================================
   VOXIFY — Design System
   Premium minimal · Dark/Light mode · editorial
   ============================================================ */

/* ---------- Fonts ---------- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Playfair+Display:wght@400;500&display=swap');

/* ---------- Custom Properties ---------- */
:root {
  --font-sans:    'Inter', system-ui, -apple-system, sans-serif;
  --font-serif:   'Playfair Display', Georgia, serif;

  /* Light palette */
  --bg:           #fafafa;
  --bg-2:         #f4f4f5;
  --bg-3:         #e4e4e7;
  --surface:      #ffffff;
  --surface-2:    #f8f8f9;
  --border:       rgba(0,0,0,.08);
  --border-2:     rgba(0,0,0,.14);

  --text-1:       #09090b;
  --text-2:       #3f3f46;
  --text-3:       #71717a;
  --text-4:       #a1a1aa;

  --accent:       #6366f1;
  --accent-hover: #4f46e5;
  --accent-light: rgba(99,102,241,.12);
  --accent-glow:  rgba(99,102,241,.25);

  --highlight-bg:    rgba(99,102,241,.18);
  --highlight-border: rgba(99,102,241,.5);

  --red:   #ef4444;
  --green: #22c55e;
  --amber: #f59e0b;

  --radius-sm: 8px;
  --radius:    12px;
  --radius-lg: 16px;
  --radius-xl: 24px;

  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow:    0 4px 16px rgba(0,0,0,.07);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.1);
  --shadow-xl: 0 24px 64px rgba(0,0,0,.12);

  --transition: 200ms cubic-bezier(.4,0,.2,1);
  --transition-slow: 400ms cubic-bezier(.4,0,.2,1);
}

[data-theme="dark"] {
  --bg:        #09090b;
  --bg-2:      #111113;
  --bg-3:      #18181b;
  --surface:   #1c1c1f;
  --surface-2: #27272a;
  --border:    rgba(255,255,255,.07);
  --border-2:  rgba(255,255,255,.12);

  --text-1: #fafafa;
  --text-2: #d4d4d8;
  --text-3: #a1a1aa;
  --text-4: #52525b;

  --accent:       #818cf8;
  --accent-hover: #6366f1;
  --accent-light: rgba(129,140,248,.15);
  --accent-glow:  rgba(129,140,248,.3);

  --highlight-bg:    rgba(129,140,248,.2);
  --highlight-border: rgba(129,140,248,.6);

  --shadow-sm: 0 1px 2px rgba(0,0,0,.3);
  --shadow:    0 4px 16px rgba(0,0,0,.4);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.5);
  --shadow-xl: 0 24px 64px rgba(0,0,0,.6);
}

/* ---------- Reset ---------- */
*,*::before,*::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; -webkit-font-smoothing: antialiased; }

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text-1);
  line-height: 1.6;
  transition: background var(--transition-slow), color var(--transition-slow);
  min-height: 100vh;
}

/* ---------- Typography ---------- */
h1,h2,h3,h4,h5,h6 { font-weight: 600; line-height: 1.25; letter-spacing: -.02em; }
h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2.25rem); }
h3 { font-size: 1.25rem; }
p  { color: var(--text-2); }
a  { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

.serif { font-family: var(--font-serif); }

/* ---------- Layout ---------- */
.container { max-width: 1120px; margin: 0 auto; padding: 0 24px; }
.container-sm { max-width: 640px; margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 20px;
  border: none; border-radius: var(--radius-sm); cursor: pointer;
  font-family: var(--font-sans); font-size: .875rem; font-weight: 500;
  letter-spacing: -.01em;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}
.btn:hover { text-decoration: none; }
.btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

.btn-primary {
  background: var(--accent); color: #fff;
  box-shadow: 0 0 0 0 var(--accent-glow);
}
.btn-primary:hover {
  background: var(--accent-hover);
  box-shadow: 0 4px 20px var(--accent-glow);
  transform: translateY(-1px);
}
.btn-primary:active { transform: translateY(0); }

.btn-secondary {
  background: var(--surface); color: var(--text-2);
  border: 1px solid var(--border-2);
  box-shadow: var(--shadow-sm);
}
.btn-secondary:hover { background: var(--bg-2); border-color: var(--border-2); color: var(--text-1); }

.btn-ghost {
  background: transparent; color: var(--text-3);
}
.btn-ghost:hover { background: var(--bg-2); color: var(--text-1); }

.btn-danger {
  background: var(--red); color: #fff;
}
.btn-danger:hover { opacity: .9; }

.btn-sm { padding: 7px 14px; font-size: .8125rem; }
.btn-lg { padding: 14px 28px; font-size: 1rem; border-radius: var(--radius); }
.btn-icon { padding: 9px; border-radius: var(--radius-sm); }

/* ---------- Form controls ---------- */
.input, .textarea, .select {
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border-2);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans); font-size: .875rem;
  color: var(--text-1);
  transition: border var(--transition), box-shadow var(--transition);
  outline: none;
}
.input::placeholder, .textarea::placeholder { color: var(--text-4); }
.input:focus, .textarea:focus, .select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
}
.textarea { resize: vertical; min-height: 120px; line-height: 1.7; }
.select { cursor: pointer; appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2371717a' stroke-width='2'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: right 10px center; padding-right: 36px; }

label { font-size: .8125rem; font-weight: 500; color: var(--text-2); display: block; margin-bottom: 6px; }
.form-group { margin-bottom: 16px; }
.form-hint { font-size: .75rem; color: var(--text-4); margin-top: 4px; }
.form-error { font-size: .75rem; color: var(--red); margin-top: 4px; }

/* ---------- Cards ---------- */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  overflow: hidden;
}
.card-body { padding: 24px; }
.card-hover { transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition); }
.card-hover:hover { box-shadow: var(--shadow-lg); transform: translateY(-2px); border-color: var(--border-2); }

/* ---------- Nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px; height: 60px;
  background: rgba(var(--bg-rgb, 250,250,250), .85);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border);
}
[data-theme="dark"] .nav { --bg-rgb: 9,9,11; }

.nav-logo {
  font-size: 1.125rem; font-weight: 700; letter-spacing: -.04em;
  color: var(--text-1); text-decoration: none;
  display: flex; align-items: center; gap: 8px;
}
.nav-logo:hover { text-decoration: none; }
.nav-logo-mark {
  width: 28px; height: 28px; border-radius: 8px;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  display: flex; align-items: center; justify-content: center;
}
.nav-actions { display: flex; align-items: center; gap: 8px; }

/* ---------- Slider (range) ---------- */
.slider {
  -webkit-appearance: none; appearance: none;
  width: 100%; height: 4px;
  border-radius: 2px;
  background: var(--bg-3);
  outline: none;
  cursor: pointer;
}
.slider::-webkit-slider-thumb {
  -webkit-appearance: none; appearance: none;
  width: 16px; height: 16px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-light);
  cursor: pointer;
  transition: transform var(--transition);
}
.slider::-webkit-slider-thumb:hover { transform: scale(1.2); }

/* ---------- Badge ---------- */
.badge {
  display: inline-flex; align-items: center;
  padding: 2px 8px; border-radius: 999px;
  font-size: .6875rem; font-weight: 600; letter-spacing: .03em;
  text-transform: uppercase;
}
.badge-accent { background: var(--accent-light); color: var(--accent); }
.badge-green  { background: rgba(34,197,94,.15); color: var(--green); }
.badge-amber  { background: rgba(245,158,11,.15); color: var(--amber); }

/* ---------- Avatar ---------- */
.avatar {
  width: 32px; height: 32px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: .8125rem; font-weight: 600; color: #fff;
  flex-shrink: 0;
}

/* ---------- Text Highlighting ---------- */
.vox-text {
  font-size: 1.0625rem;
  line-height: 1.95;
  color: var(--text-2);
  letter-spacing: .003em;
}

/* Individual word span */
.vox-word {
  display: inline;
  border-radius: 3px;
  padding: 1px 2px;
  transition: background .12s, color .12s, border-color .12s;
  cursor: pointer;
  border-bottom: 1.5px solid transparent;
}
.vox-word:hover {
  background: var(--bg-2);
  color: var(--text-1);
}

/* Entire sentence being read — subtle background */
.vox-word.sentence-active {
  background: rgba(99, 102, 241, .07);
  border-radius: 2px;
}
[data-theme="dark"] .vox-word.sentence-active {
  background: rgba(129, 140, 248, .10);
}

/* Current word — strong highlight + underline */
.vox-word.active {
  background: var(--highlight-bg) !important;
  color: var(--text-1) !important;
  border-bottom-color: var(--highlight-border);
  border-radius: 3px;
  font-weight: 500;
}

/* ---------- Audio Player ---------- */
.player {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-xl);
  padding: 20px 24px;
  backdrop-filter: blur(20px);
}

.player-progress {
  width: 100%;
  position: relative;
  height: 4px;
  background: var(--bg-3);
  border-radius: 2px;
  cursor: pointer;
  margin: 16px 0;
}
.player-progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #8b5cf6);
  border-radius: 2px;
  transition: width .15s linear;
  position: relative;
}
.player-progress-fill::after {
  content: '';
  position: absolute; right: -6px; top: 50%;
  transform: translateY(-50%);
  width: 12px; height: 12px;
  background: var(--accent); border-radius: 50%;
  box-shadow: 0 0 0 3px var(--accent-light);
}

.player-controls {
  display: flex; align-items: center; justify-content: center; gap: 8px;
}
.player-btn {
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--bg-2); border: 1px solid var(--border);
  border-radius: 50%; cursor: pointer; color: var(--text-2);
  transition: all var(--transition);
}
.player-btn:hover { background: var(--accent); color: #fff; border-color: var(--accent); }
.player-btn.play {
  width: 52px; height: 52px; font-size: 1.25rem;
  background: var(--accent); color: #fff; border-color: var(--accent);
  box-shadow: 0 4px 20px var(--accent-glow);
}
.player-btn.play:hover { background: var(--accent-hover); transform: scale(1.05); }

/* Waveform visualizer */
.waveform {
  display: flex; align-items: center; gap: 3px;
  height: 32px;
}
.wave-bar {
  width: 3px; border-radius: 2px;
  background: var(--accent);
  opacity: .5;
  animation: none;
}
.wave-bar.playing { animation: wave var(--dur, .8s) ease-in-out infinite alternate; opacity: .8; }
@keyframes wave { from { height: 4px; } to { height: var(--h, 24px); } }

/* ---------- Dropdown ---------- */
.dropdown { position: relative; display: inline-block; }
.dropdown-menu {
  position: absolute; top: calc(100% + 8px); right: 0;
  min-width: 180px;
  background: var(--surface); border: 1px solid var(--border-2);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  overflow: hidden; z-index: 200;
  opacity: 0; transform: translateY(-6px) scale(.98); pointer-events: none;
  transition: all var(--transition);
}
.dropdown-menu.open { opacity: 1; transform: none; pointer-events: auto; }
.dropdown-item {
  display: flex; align-items: center; gap: 10px;
  padding: 9px 14px; font-size: .875rem; color: var(--text-2);
  cursor: pointer; transition: background var(--transition);
}
.dropdown-item:hover { background: var(--bg-2); color: var(--text-1); }
.dropdown-item.danger { color: var(--red); }
.dropdown-divider { height: 1px; background: var(--border); margin: 4px 0; }

/* ---------- Modal ---------- */
.modal-backdrop {
  position: fixed; inset: 0; z-index: 300;
  background: rgba(0,0,0,.5);
  backdrop-filter: blur(4px);
  display: flex; align-items: center; justify-content: center; padding: 24px;
  opacity: 0; pointer-events: none; transition: opacity var(--transition);
}
.modal-backdrop.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-xl); box-shadow: var(--shadow-xl);
  width: 100%; max-width: 480px;
  transform: translateY(16px) scale(.98);
  transition: transform var(--transition);
}
.modal-backdrop.open .modal { transform: none; }
.modal-header { padding: 24px 24px 0; display: flex; align-items: center; justify-content: space-between; }
.modal-body { padding: 20px 24px; }
.modal-footer { padding: 0 24px 24px; display: flex; gap: 8px; justify-content: flex-end; }

/* ---------- Toast ---------- */
#toasts {
  position: fixed; bottom: 24px; right: 24px;
  z-index: 500; display: flex; flex-direction: column; gap: 8px; pointer-events: none;
}
.toast {
  display: flex; align-items: center; gap: 12px;
  padding: 12px 16px; border-radius: var(--radius);
  background: var(--surface); border: 1px solid var(--border-2);
  box-shadow: var(--shadow-lg); font-size: .875rem; color: var(--text-1);
  pointer-events: auto;
  animation: slideUp .3s cubic-bezier(.34,1.56,.64,1) forwards;
  max-width: 320px;
}
.toast.out { animation: slideDown .25s ease forwards; }
.toast-success .toast-icon { color: var(--green); }
.toast-error   .toast-icon { color: var(--red); }
.toast-info    .toast-icon { color: var(--accent); }
@keyframes slideUp   { from { opacity:0; transform:translateY(16px); } to { opacity:1; transform:none; } }
@keyframes slideDown { from { opacity:1; transform:none; } to { opacity:0; transform:translateY(8px); } }

/* ---------- Loading skeleton ---------- */
.skeleton {
  background: linear-gradient(90deg, var(--bg-2) 25%, var(--bg-3) 50%, var(--bg-2) 75%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
  border-radius: var(--radius-sm);
}
@keyframes shimmer { from { background-position: 200% 0; } to { background-position: -200% 0; } }

/* ---------- Upload zone ---------- */
.upload-zone {
  border: 2px dashed var(--border-2);
  border-radius: var(--radius-lg);
  padding: 40px 24px;
  text-align: center;
  cursor: pointer;
  transition: all var(--transition);
  background: var(--surface-2);
}
.upload-zone:hover, .upload-zone.drag-over {
  border-color: var(--accent); background: var(--accent-light);
}

/* ---------- Tabs ---------- */
.tabs { display: flex; gap: 4px; padding: 4px; background: var(--bg-2); border-radius: var(--radius-sm); }
.tab {
  padding: 7px 16px; border-radius: 6px;
  font-size: .875rem; font-weight: 500; color: var(--text-3);
  cursor: pointer; transition: all var(--transition);
  border: none; background: transparent;
}
.tab.active { background: var(--surface); color: var(--text-1); box-shadow: var(--shadow-sm); }

/* ---------- Scrollbar ---------- */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--bg-3); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-4); }

/* ---------- Utility ---------- */
.sr-only { position:absolute; width:1px; height:1px; overflow:hidden; clip:rect(0,0,0,0); }
.text-gradient {
  background: linear-gradient(135deg, var(--accent), #8b5cf6, #ec4899);
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}
.divider { height: 1px; background: var(--border); margin: 24px 0; }
.spinning { animation: spin .8s linear infinite; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- Page transitions ---------- */
.page-enter { animation: pageIn .35s ease forwards; }
@keyframes pageIn { from { opacity:0; transform:translateY(8px); } to { opacity:1; transform:none; } }

/* ---------- Responsive ---------- */
@media (max-width: 768px) {
  .nav { padding: 0 16px; }
  .container, .container-sm { padding: 0 16px; }
  .player { padding: 16px; }
  .hide-mobile { display: none; }
}
@media (max-width: 480px) {
  .player-controls { gap: 4px; }
  .player-btn { width: 36px; height: 36px; }
  .player-btn.play { width: 46px; height: 46px; }
}