/* =========================================================
   Video Subtitler — Shared Stylesheet
   ------------------------------------------------------------
   Shared between landing (index.html) and app (app.html).
   Vanilla CSS — no preprocessor, no framework.
   ========================================================= */


/* =========================================================
   1. Theme Tokens
   ========================================================= */
:root {
  /* Surfaces */
  --color-bg: #0a0a0b;
  --color-surface: #141415;
  --color-surface-hover: #1a1a1c;
  --color-surface-raised: #1a1a1c;

  /* Borders */
  --color-border: #222224;
  --color-border-hover: #333336;

  /* Text */
  --color-text: #ededed;
  --color-text-secondary: #888;
  --color-text-tertiary: #555;

  /* Accent */
  --color-accent: #10b981;
  --color-accent-hover: #34d399;
  --color-accent-muted: rgba(16, 185, 129, 0.1);
  --color-accent-glow: rgba(16, 185, 129, 0.25);

  /* Status */
  --color-danger: #ef4444;
  --color-danger-muted: rgba(239, 68, 68, 0.1);
  --color-danger-border: rgba(239, 68, 68, 0.3);
  --color-warning: #f59e0b;

  /* Code surfaces */
  --color-code-bg: #0d0d0e;
  --color-code-border: #1d1d20;

  /* Radii */
  --radius-sm: 6px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);

  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* Motion */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --ease: cubic-bezier(0.16, 1, 0.3, 1);

  /* Layout */
  --max-w: 1400px;
  --nav-h: 64px;

  /* --- Short aliases (app.html compat) --- */
  --bg: var(--color-bg);
  --surface: var(--color-surface);
  --surface-2: var(--color-surface-hover);
  --surface-3: #202023;
  --border: var(--color-border);
  --border-strong: var(--color-border-hover);
  --text: var(--color-text);
  --text-secondary: var(--color-text-secondary);
  --text-tertiary: var(--color-text-tertiary);
  --accent: var(--color-accent);
  --accent-hover: var(--color-accent-hover);
  --accent-soft: var(--color-accent-muted);
  --accent-glow: var(--color-accent-glow);
  --code-bg: var(--color-code-bg);
  --code-border: var(--color-code-border);
  --selection: rgba(16, 185, 129, 0.35);
  --danger: #f87171;
  --danger-soft: rgba(248, 113, 113, 0.12);
  --danger-border: rgba(248, 113, 113, 0.3);
  --shadow-soft: 0 1px 0 rgba(255, 255, 255, 0.04) inset, 0 12px 40px -12px rgba(0, 0, 0, 0.6);
  --shadow-card: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 8px 28px -16px rgba(0, 0, 0, 0.5);
  --noise-opacity: 0.04;
  --radius: 12px;
}

[data-theme="light"] {
  --color-bg: #fafafa;
  --color-surface: #ffffff;
  --color-surface-hover: #f5f5f5;
  --color-surface-raised: #f5f5f5;

  --color-border: #e5e5e5;
  --color-border-hover: #d4d4d4;

  --color-text: #171717;
  --color-text-secondary: #737373;
  --color-text-tertiary: #a3a3a3;

  --color-accent: #059669;
  --color-accent-hover: #10b981;
  --color-accent-muted: rgba(5, 150, 105, 0.08);
  --color-accent-glow: rgba(5, 150, 105, 0.18);

  --color-danger: #dc2626;
  --color-danger-muted: rgba(220, 38, 38, 0.08);
  --color-danger-border: rgba(220, 38, 38, 0.2);
  --color-warning: #d97706;

  --color-code-bg: #f4f4f5;
  --color-code-border: #e4e4e7;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);

  /* Short alias overrides for light theme */
  --surface-3: #ececec;
  --selection: rgba(5, 150, 105, 0.25);
  --shadow-soft: 0 1px 0 rgba(255, 255, 255, 0.6) inset, 0 12px 40px -16px rgba(0, 0, 0, 0.12);
  --shadow-card: 0 1px 2px rgba(0, 0, 0, 0.04), 0 8px 28px -16px rgba(0, 0, 0, 0.08);
  --noise-opacity: 0.025;
  --danger: #dc2626;
  --danger-soft: rgba(220, 38, 38, 0.06);
  --danger-border: rgba(220, 38, 38, 0.2);
}


/* =========================================================
   2. Reset & Base
   ========================================================= */
*,
*::before,
*::after { box-sizing: border-box; }

* { margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  overflow-x: hidden;
  transition:
    background var(--transition-normal) var(--ease),
    color var(--transition-normal) var(--ease);
}

::selection {
  background: var(--color-accent-muted);
  color: var(--color-text);
}

img,
svg,
video {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: none;
  cursor: pointer;
}

a {
  color: inherit;
  text-decoration: none;
}

input,
textarea,
select {
  font: inherit;
  color: inherit;
}


/* =========================================================
   3. Typography Scale
   ========================================================= */
.display {
  font-size: 64px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.035em;
}

h1, .h1 {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h2, .h2 {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: -0.02em;
  color: var(--color-text);
}

h3, .h3 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.015em;
  color: var(--color-text);
}

.body-sm {
  font-size: 14px;
  line-height: 1.6;
}

.caption {
  font-size: 12px;
  line-height: 1.4;
}

.mono {
  font-family: var(--font-mono);
  font-size: 14px;
}


/* =========================================================
   4. Background Atmosphere
   ========================================================= */
.bg-mesh {
  position: fixed;
  inset: 0;
  z-index: -2;
  pointer-events: none;
  overflow: hidden;
}

.bg-mesh::before,
.bg-mesh::after {
  content: '';
  position: absolute;
  width: 70vmax;
  height: 70vmax;
  border-radius: 50%;
  filter: blur(140px);
  opacity: 0.35;
  will-change: transform;
}

.bg-mesh::before {
  background: radial-gradient(circle at center, var(--color-accent) 0%, transparent 60%);
  top: -30vmax;
  left: -10vmax;
  animation: mesh-drift-a 28s var(--ease) infinite;
}

.bg-mesh::after {
  background: radial-gradient(circle at center, #6366f1 0%, transparent 60%);
  bottom: -35vmax;
  right: -15vmax;
  animation: mesh-drift-b 32s var(--ease) infinite;
}

[data-theme="light"] .bg-mesh::before { opacity: 0.18; }

[data-theme="light"] .bg-mesh::after {
  opacity: 0.14;
  background: radial-gradient(circle at center, #818cf8 0%, transparent 60%);
}

@keyframes mesh-drift-a {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%     { transform: translate(8vw, 4vh) scale(1.08); }
  66%     { transform: translate(-4vw, 6vh) scale(0.95); }
}

@keyframes mesh-drift-b {
  0%, 100% { transform: translate(0, 0) scale(1); }
  33%     { transform: translate(-6vw, -5vh) scale(1.05); }
  66%     { transform: translate(5vw, -3vh) scale(0.92); }
}

.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--color-border) 1px, transparent 1px),
    linear-gradient(90deg, var(--color-border) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 70%);
  opacity: 0.4;
  z-index: -1;
}


/* =========================================================
   5. Layout Helpers
   ========================================================= */
.container {
  width: 100%;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 24px;
}

.section {
  padding: 120px 0;
  position: relative;
}

.grid-2 {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

/* Two-column app layout (config | results) */
.two-column {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}


/* =========================================================
   6. Navigation
   ========================================================= */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 14px 0;
  background: color-mix(in srgb, var(--color-bg) 80%, transparent);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--color-border);
  transition: all var(--transition-normal) var(--ease);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: -0.01em;
  color: var(--color-text);
  transition: opacity var(--transition-fast) var(--ease);
}

.nav-brand:hover { opacity: 0.75; }

.nav-brand-mark {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-muted);
  border: 1px solid color-mix(in srgb, var(--color-accent) 30%, transparent);
  border-radius: var(--radius-md);
  color: var(--color-accent);
}

.nav-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: all var(--transition-fast) var(--ease);
}

.nav-link:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

.nav-icon-btn {
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-fast) var(--ease);
}

.nav-icon-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-hover);
  border-color: var(--color-border);
}

.nav-icon-btn svg {
  transition: transform var(--transition-normal) var(--ease);
}

.nav-open-app {
  padding: 8px 14px;
  background: var(--color-text);
  color: var(--color-bg);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  transition: all var(--transition-fast) var(--ease);
}

.nav-open-app:hover {
  background: var(--color-accent-hover);
  color: var(--color-text);
  transform: translateY(-1px);
}


/* =========================================================
   7. Buttons
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  white-space: nowrap;
  user-select: none;
  letter-spacing: -0.005em;
  transition: all var(--transition-fast) var(--ease);
}

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

.btn-primary {
  background: var(--color-accent);
  color: #04140d;
  box-shadow:
    0 0 0 0 var(--color-accent-glow),
    0 4px 18px -6px var(--color-accent-glow);
}

.btn-primary:hover:not(:disabled) {
  background: var(--color-accent-hover);
  transform: translateY(-1px);
  box-shadow:
    0 0 0 4px var(--color-accent-muted),
    0 10px 28px -8px var(--color-accent-glow);
}

.btn-primary:active:not(:disabled) { transform: translateY(0); }
.btn-primary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  box-shadow: none;
}

.btn-secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--color-surface-hover);
  border-color: var(--color-border-hover);
  transform: translateY(-1px);
}

.btn-secondary:active:not(:disabled) { transform: translateY(0); }
.btn-secondary:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.btn-ghost {
  background: transparent;
  color: var(--color-text-secondary);
  border-color: transparent;
}

.btn-ghost:hover:not(:disabled) {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.btn-ghost:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

/* Sizes */
.btn-sm { padding: 8px 12px;  font-size: 13px; min-height: 36px; }
.btn-md { padding: 10px 16px; font-size: 14px; min-height: 40px; }
.btn-lg { padding: 14px 22px; font-size: 15px; font-weight: 600; min-height: 48px; }

.btn-block { width: 100%; }

/* Spinner inside button */
.btn-spinner {
  width: 16px;
  height: 16px;
  border: 2px solid currentColor;
  border-right-color: transparent;
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: none;
}

.btn.is-loading .btn-spinner { display: inline-block; }
.btn.is-loading .btn-label { opacity: 0.7; }

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

/* Danger text button */
.btn-text {
  padding: 4px 10px;
  font-size: 13px;
  color: var(--color-text-secondary);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--transition-fast) var(--ease);
}

.btn-text:hover {
  color: var(--color-danger);
  border-color: var(--color-danger-border);
  background: var(--color-danger-muted);
}


/* =========================================================
   8. Cards / Panel
   ========================================================= */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: border-color var(--transition-fast) var(--ease);
}

.card:hover {
  border-color: var(--color-border-hover);
}

.panel {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-sm);
  position: relative;
}

.panel-header {
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-bottom: 24px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

.panel-title {
  font-size: 18px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--color-text);
  display: flex;
  align-items: center;
  gap: 10px;
}

.panel-title::before {
  content: '';
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 10px var(--color-accent-glow);
}

.panel-sub {
  font-size: 13px;
  color: var(--color-text-secondary);
}


/* =========================================================
   9. Block & Field primitives (form sections)
   ========================================================= */
.block {
  margin-bottom: 22px;
}

.block:last-child { margin-bottom: 0; }

.block-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: -0.005em;
  color: var(--color-text);
  margin-bottom: 8px;
}

.block-info {
  font-size: 12px;
  color: var(--color-text-tertiary);
  margin-top: 6px;
  line-height: 1.45;
}

.field {
  display: flex;
  flex-direction: column;
  margin-bottom: 14px;
}

.field:last-child { margin-bottom: 0; }

.field-label {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  margin-bottom: 7px;
}

.field-label .value {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  padding: 2px 8px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-accent);
  min-width: 32px;
  text-align: center;
}

.field-info {
  font-size: 11px;
  color: var(--color-text-tertiary);
  margin-top: 6px;
  line-height: 1.4;
}


/* =========================================================
   10. Form Controls
   ========================================================= */

/* Select dropdown */
.select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  width: 100%;
  padding: 10px 36px 10px 12px;
  background-color: var(--color-surface-raised);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23888888' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition-fast) var(--ease);
}

[data-theme="light"] .select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23737373' stroke-width='2.5' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
}

.select:hover { border-color: var(--color-border-hover); }

.select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

/* Range slider */
.slider {
  appearance: none;
  -webkit-appearance: none;
  width: 100%;
  height: 24px;
  background: transparent;
  cursor: pointer;
  margin: 0;
}

.slider::-webkit-slider-runnable-track {
  height: 4px;
  background: var(--color-surface-hover);
  border-radius: 4px;
  border: none;
}

.slider::-moz-range-track {
  height: 4px;
  background: var(--color-surface-hover);
  border-radius: 4px;
  border: none;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  margin-top: -6px;
  box-shadow: 0 0 0 0 var(--color-accent-glow);
  transition:
    box-shadow var(--transition-fast) var(--ease),
    transform var(--transition-fast) var(--ease);
}

.slider::-moz-range-thumb {
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-accent);
  border: 2px solid var(--color-bg);
  box-shadow: 0 0 0 0 var(--color-accent-glow);
  transition:
    box-shadow var(--transition-fast) var(--ease),
    transform var(--transition-fast) var(--ease);
}

.slider:hover::-webkit-slider-thumb {
  box-shadow: 0 0 0 6px var(--color-accent-muted);
  transform: scale(1.1);
}

.slider:hover::-moz-range-thumb {
  box-shadow: 0 0 0 6px var(--color-accent-muted);
  transform: scale(1.1);
}

.slider:focus { outline: none; }

.slider:focus-visible::-webkit-slider-thumb {
  box-shadow: 0 0 0 8px var(--color-accent-muted);
}

.slider:focus-visible::-moz-range-thumb {
  box-shadow: 0 0 0 8px var(--color-accent-muted);
}

.slider:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.slider:disabled::-webkit-slider-thumb { background: var(--color-text-tertiary); }
.slider:disabled::-moz-range-thumb     { background: var(--color-text-tertiary); }

/* Color picker row */
.color-row {
  display: flex;
  gap: 8px;
  align-items: stretch;
}

.color-picker {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;
  width: 44px;
  height: 38px;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-raised);
  cursor: pointer;
  overflow: hidden;
  transition: border-color var(--transition-fast) var(--ease);
}

.color-picker:hover { border-color: var(--color-border-hover); }

.color-picker::-webkit-color-swatch-wrapper { padding: 3px; }
.color-picker::-webkit-color-swatch         { border: none; border-radius: 6px; }
.color-picker::-moz-color-swatch            { border: none; border-radius: 6px; }

.color-picker:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

.color-hex {
  flex: 1;
  min-width: 0;
  padding: 10px 12px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  transition: border-color var(--transition-fast) var(--ease);
}

.color-hex:hover { border-color: var(--color-border-hover); }

.color-hex:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

/* Generic text input */
.input {
  width: 100%;
  padding: 10px 12px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text);
  font-size: 14px;
  transition: border-color var(--transition-fast) var(--ease);
}

.input:hover { border-color: var(--color-border-hover); }

.input:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

/* Textarea (used for SRT editor & generic) */
.textarea {
  width: 100%;
  min-height: 120px;
  padding: 14px 16px;
  background: var(--color-surface-raised);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-sans);
  font-size: 14px;
  line-height: 1.55;
  resize: vertical;
  transition: border-color var(--transition-fast) var(--ease);
}

.textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

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


/* =========================================================
   11. Mode Toggle (Segmented Control)
   ========================================================= */
.mode-toggle {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4px;
  padding: 4px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
}

.mode-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  text-align: left;
  color: var(--color-text-secondary);
  border: 1px solid transparent;
  transition: all var(--transition-fast) var(--ease);
}

.mode-btn:hover:not(.active) {
  color: var(--color-text);
  background: var(--color-surface-hover);
}

.mode-btn.active {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: var(--color-border-hover);
  box-shadow:
    var(--shadow-sm),
    0 0 0 1px var(--color-accent-muted);
}

.mode-btn-title {
  font-size: 13px;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
}

.mode-btn-title .dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-text-tertiary);
  transition: background var(--transition-fast) var(--ease);
}

.mode-btn.active .mode-btn-title .dot {
  background: var(--color-accent);
  box-shadow: 0 0 6px var(--color-accent-glow);
}

.mode-btn-sub {
  font-size: 11px;
  color: var(--color-text-tertiary);
}


/* =========================================================
   12. Upload Zone
   ========================================================= */
.upload-zone {
  position: relative;
  border-radius: var(--radius-lg);
  border: 2px dashed var(--color-border-hover);
  background: var(--color-surface-raised);
  transition: all var(--transition-fast) var(--ease);
  overflow: hidden;
}

.upload-zone:hover {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent-muted) 40%, var(--color-surface-raised));
}

.upload-zone.drag-over {
  border-color: var(--color-accent);
  border-style: solid;
  background: var(--color-accent-muted);
  transform: scale(1.01);
}

.upload-zone.drag-over .upload-zone-icon {
  transform: translateY(-2px) scale(1.1);
  color: var(--color-accent-hover);
}

.upload-zone-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 36px 20px;
  cursor: pointer;
  text-align: center;
}

.upload-zone-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  transition: all var(--transition-fast) var(--ease);
  margin-bottom: 4px;
}

.upload-zone:hover .upload-zone-icon {
  color: var(--color-accent);
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px var(--color-accent-muted);
}

.upload-zone-text {
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.upload-zone-sub {
  font-size: 12px;
  color: var(--color-text-tertiary);
}

.upload-zone-filled {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 14px;
  background: var(--color-surface-raised);
}


/* =========================================================
   13. Video Player & Preview Frames
   ========================================================= */
.video-player {
  width: 100%;
  border-radius: var(--radius-md);
  background: #000;
  max-height: 320px;
  aspect-ratio: 4 / 3;
}

.video-frame,
.preview-frame {
  position: relative;
  width: 100%;
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  aspect-ratio: 4 / 3;
  display: flex;
  align-items: center;
  justify-content: center;
}

.video-frame video,
.preview-frame img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  background: #000;
}

.video-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  padding: 32px 20px;
  color: var(--color-text-tertiary);
  text-align: center;
}

.video-empty-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  color: var(--color-text-tertiary);
}

.video-empty-text {
  font-size: 13px;
  line-height: 1.5;
  max-width: 280px;
}

/* ── Live font preview (inline inside accordion) ──────────────────────────── */
.live-font-preview-wrapper {
  margin-bottom: 14px;
}

.live-font-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  align-items: flex-end;
  justify-content: center;
  padding: 0 10px 20px 10px;
}

.live-font-preview-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.85;
}

.live-font-preview-text {
  line-height: 1.4;
  text-align: center;
  word-break: break-word;
  position: relative;
  z-index: 1;
}

.rendered-preview {
  position: relative;
  width: 100%;
  aspect-ratio: 4 / 3;
  background: #000;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  margin-top: 8px;
}

.rendered-preview img {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.live-font-preview-hint {
  font-size: 11px;
  color: var(--color-text-tertiary);
  margin-top: 6px;
  text-align: center;
}

.video-meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 4px 4px 0;
}

.video-meta-left {
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 0;
  flex: 1;
}

.video-filename {
  font-size: 13px;
  font-weight: 500;
  color: var(--color-text);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  flex: 1;
  min-width: 0;
}

.video-filesize {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}


/* =========================================================
   14. Progress Bar
   ========================================================= */
.progress-container {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 14px 16px;
  margin-bottom: 22px;
  animation: progress-in var(--transition-normal) var(--ease);
}

@keyframes progress-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.progress-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  margin-bottom: 10px;
}

.progress-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  color: var(--color-accent);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

.progress-label::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 8px var(--color-accent-glow);
  animation: pulse 1.5s var(--ease) infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50%      { opacity: 0.4; }
}

.progress-pct {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-secondary);
}

.progress-track {
  height: 6px;
  background: var(--color-surface);
  border-radius: 6px;
  overflow: hidden;
  position: relative;
}

.progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  border-radius: 6px;
  transition: width 0.4s var(--ease);
  position: relative;
  overflow: hidden;
}

.progress-fill::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
  animation: progress-shine 1.4s linear infinite;
}

@keyframes progress-shine {
  to { transform: translateX(100%); }
}

.progress-text {
  font-size: 13px;
  color: var(--color-text);
  margin-top: 10px;
  font-weight: 500;
}


/* =========================================================
   15. Error Display
   ========================================================= */
.error-display {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  margin-top: 16px;
  background: var(--color-danger-muted);
  border: 1px solid var(--color-danger-border);
  border-left: 3px solid var(--color-danger);
  border-radius: var(--radius-lg);
  color: var(--color-danger);
  font-size: 13px;
  line-height: 1.5;
  animation: error-in var(--transition-normal) var(--ease);
}

@keyframes error-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.error-display svg {
  flex-shrink: 0;
  margin-top: 2px;
}

.error-display p { color: var(--color-danger); }


/* =========================================================
    16. Accordion (Collapsible Section)
    ========================================================= */
.accordion {
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--transition-fast) var(--ease);
}

.accordion.open { border-color: var(--color-border-hover); }

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  padding: 14px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--color-text);
  cursor: pointer;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  transition: background var(--transition-fast) var(--ease);
  /* Ensure hit area is at least 44px for mobile touch targets */
  min-height: 48px;
  position: relative;
  z-index: 1;
}

.accordion-header:hover { background: var(--color-surface-hover); }

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

.accordion-header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-muted);
  color: var(--color-accent);
}

.accordion-chevron {
  color: var(--color-text-secondary);
  transition: transform var(--transition-normal) var(--ease);
  flex-shrink: 0;
}

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

.accordion-body {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s var(--ease);
}

.accordion.open .accordion-body {
  grid-template-rows: 1fr;
}

.accordion-body-inner {
  overflow: hidden;
  padding: 0 16px;
  border-top: 1px solid var(--color-border);
}

.accordion.open .accordion-body-inner {
  padding: 4px 16px 18px;
}

.accordion-body-inner > * + * { margin-top: 14px; }


/* =========================================================
   17. SRT Editor
   ========================================================= */
.srt-editor-wrap {
  position: relative;
  border-radius: var(--radius-lg);
  background: var(--color-code-bg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  transition: border-color var(--transition-fast) var(--ease);
}

.srt-editor-wrap:focus-within {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-muted);
}

.srt-editor-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-code-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-tertiary);
  letter-spacing: 0.04em;
}

.srt-editor-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.srt-dots {
  display: inline-flex;
  gap: 4px;
}

.srt-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-border-hover);
}

.srt-editor {
  width: 100%;
  min-height: 220px;
  max-height: 480px;
  padding: 14px 16px;
  background: var(--color-code-bg);
  color: var(--color-text);
  border: none;
  outline: none;
  resize: vertical;
  font-family: var(--font-mono);
  font-size: 12.5px;
  line-height: 1.65;
  letter-spacing: 0;
  tab-size: 4;
}

.srt-editor::placeholder { color: var(--color-text-tertiary); }

.srt-editor-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  padding: 8px 12px;
  background: var(--color-surface-raised);
  border-top: 1px solid var(--color-code-border);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-tertiary);
}

.srt-line-count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}


/* =========================================================
   18. Actions Row (button grid for app.html)
   ========================================================= */
.actions-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}


/* =========================================================
   19. Eyebrow (small accent label, landing page)
   ========================================================= */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  padding: 6px 12px;
  background: var(--color-accent-muted);
  border: 1px solid var(--color-accent-muted);
  border-radius: 100px;
}

.eyebrow::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--color-accent-glow);
}


/* =========================================================
   20. Section Header (landing page)
   ========================================================= */
.section-header {
  margin-bottom: 64px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.section-title {
  font-size: 40px;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--color-text);
  margin-bottom: 16px;
}

.section-subtitle {
  font-size: 17px;
  color: var(--color-text-secondary);
  max-width: 600px;
  line-height: 1.6;
}


/* =========================================================
   21. Hero (landing page)
   ========================================================= */
.hero {
  padding: 180px 0 140px;
  position: relative;
  overflow: hidden;
}

.hero-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
}

.hero-title {
  font-size: 64px;
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.04;
  color: var(--color-text);
  max-width: 900px;
  margin-bottom: 24px;
}

.hero-title .accent {
  background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-sub {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: 40px;
  line-height: 1.55;
}

.hero-ctas {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 56px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  max-width: 720px;
  width: 100%;
  padding: 20px 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.hero-stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.hero-stat-value {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-text);
  letter-spacing: -0.02em;
}

.hero-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}


/* =========================================================
   22. Features Grid (landing page)
   ========================================================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-card {
  position: relative;
  padding: 28px;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  transition: all var(--transition-normal) var(--ease);
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at top right, var(--color-accent-muted), transparent 60%);
  opacity: 0;
  transition: opacity var(--transition-normal) var(--ease);
  pointer-events: none;
}

.feature-card:hover {
  border-color: var(--color-border-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.feature-card:hover::before { opacity: 1; }

.feature-card > * { position: relative; }

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-accent-muted);
  border: 1px solid color-mix(in srgb, var(--color-accent) 25%, transparent);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  margin-bottom: 20px;
  transition: all var(--transition-normal) var(--ease);
}

.feature-card:hover .feature-icon {
  transform: scale(1.05);
  box-shadow: 0 0 0 4px var(--color-accent-muted);
}

.feature-title {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: 8px;
  letter-spacing: -0.01em;
}

.feature-desc {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}


/* =========================================================
   23. Steps (How It Works, landing page)
   ========================================================= */
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  position: relative;
}

.step {
  padding: 32px 28px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  border-radius: var(--radius-xl);
  margin-left: -1px;
  transition: all var(--transition-normal) var(--ease);
}

.step:first-child { margin-left: 0; }

.step:hover {
  border-color: var(--color-accent);
  z-index: 1;
}

.step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--color-accent);
  letter-spacing: 0.05em;
}

.step-icon {
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-secondary);
}

.step-title {
  font-size: 22px;
  font-weight: 600;
  letter-spacing: -0.015em;
  color: var(--color-text);
  margin-bottom: 10px;
}

.step-desc {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}


/* =========================================================
   24. Quick Start (landing page)
   ========================================================= */
.quickstart {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 56px;
  align-items: start;
}

.quickstart-info p {
  color: var(--color-text-secondary);
  font-size: 15px;
  margin-bottom: 24px;
}

.quickstart-prereqs {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.quickstart-prereqs li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 14px;
  color: var(--color-text-secondary);
}

.quickstart-prereqs li svg {
  flex-shrink: 0;
  margin-top: 3px;
  color: var(--color-accent);
}

.quickstart-prereqs code {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-accent);
  background: var(--color-surface-hover);
  padding: 2px 6px;
  border-radius: 4px;
}


/* =========================================================
   25. Code Block (Quick Start)
   ========================================================= */
.code-block {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-bottom: 1px solid var(--color-code-border);
  background: var(--color-surface-raised);
}

.code-dots {
  display: flex;
  gap: 6px;
}

.code-dots span {
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--color-border-hover);
}

.code-dots span:nth-child(1) { background: #ef4444; opacity: 0.6; }
.code-dots span:nth-child(2) { background: #eab308; opacity: 0.6; }
.code-dots span:nth-child(3) { background: #22c55e; opacity: 0.6; }

.code-title {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-text-tertiary);
  letter-spacing: 0.02em;
}

.code-copy {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--color-text-secondary);
  padding: 4px 10px;
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-sm);
  transition: all var(--transition-fast) var(--ease);
}

.code-copy:hover {
  color: var(--color-text);
  border-color: var(--color-border-hover);
}

.code-copy.copied {
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.code-body {
  padding: 20px 24px;
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--color-text);
  overflow-x: auto;
  margin: 0;
}

.code-body .comment { color: var(--color-text-tertiary); }
.code-body .prompt  { color: var(--color-accent); user-select: none; }
.code-body .cmd     { color: var(--color-accent); font-weight: 500; }
.code-body .flag    { color: var(--color-warning); }
.code-body .string  { color: #a5b4fc; }

.code-note {
  padding: 14px 24px;
  background: var(--color-surface-raised);
  border-top: 1px solid var(--color-code-border);
  font-size: 13px;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.code-note strong { color: var(--color-text); font-weight: 600; }

.code-note code {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--color-accent);
  background: var(--color-accent-muted);
  padding: 2px 8px;
  border-radius: 4px;
}


/* =========================================================
   26. Footer (landing page)
   ========================================================= */
.footer {
  border-top: 1px solid var(--color-border);
  padding: 48px 0;
  margin-top: 40px;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--color-text-secondary);
  font-size: 14px;
}

.footer-meta {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
  font-size: 13px;
  color: var(--color-text-tertiary);
}

.footer-meta a {
  color: var(--color-text-secondary);
  transition: color var(--transition-fast) var(--ease);
}

.footer-meta a:hover { color: var(--color-accent); }

.footer-meta-divider {
  width: 4px;
  height: 4px;
  background: var(--color-border-hover);
  border-radius: 50%;
}

.footer-built {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
  font-size: 12px;
}

.footer-built strong { color: var(--color-text-secondary); font-weight: 500; }


/* =========================================================
   27. Animations (fadeInUp keyframe + reveal pattern)
   ========================================================= */
@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in-up {
  animation: fadeInUp var(--transition-normal) var(--ease) both;
}

/* Reveal-on-scroll pattern: elements start hidden,
   IntersectionObserver adds `.visible` to reveal them. */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition:
    opacity 0.8s var(--ease),
    transform 0.8s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}


/* =========================================================
   28. Focus States (Accessibility)
   ========================================================= */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-md);
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
}


/* =========================================================
   29. Utility
   ========================================================= */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

[hidden] { display: none; }


/* =========================================================
   30. Reduced Motion (Accessibility)
   ========================================================= */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .progress-fill::after { animation: none; }
  .progress-label::before { animation: none; }
}


/* =========================================================
   31. Responsive
   ========================================================= */

/* ----- Tablet (≤ 960px) ----- */
@media (max-width: 960px) {
  .container { padding: 0 20px; }

  .section { padding: 80px 0; }

  /* Two-column app layout collapses */
  .two-column {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  /* Sticky results panel becomes static */
  .results-panel {
    position: static;
  }

  /* Hero title shrinks */
  .hero-title { font-size: 48px; }

  /* Features 3 → 2 columns */
  .features-grid { grid-template-columns: repeat(2, 1fr); }

  /* Steps collapse to vertical stack */
  .steps { grid-template-columns: 1fr; }
  .step { margin-left: 0; margin-top: -1px; }
  .step:first-child { margin-top: 0; }

  /* Quickstart collapses */
  .quickstart { grid-template-columns: 1fr; gap: 32px; }

  /* App main padding */
  .app-main { padding-top: calc(var(--nav-h) + 24px); }
}

/* ----- Small tablet / large phone (≤ 768px) ----- */
@media (max-width: 768px) {
  .section { padding: 64px 0; }

  .hero { padding: 140px 0 80px; }
  .hero-title { font-size: 40px; }
  .hero-sub { font-size: 16px; }

  .section-title { font-size: 32px; }
  .section-header { margin-bottom: 40px; }

  h1, .h1 { font-size: 36px; }
  h2, .h2 { font-size: 28px; }
  h3, .h3 { font-size: 20px; }
}

/* ----- Mobile (≤ 640px) ----- */
@media (max-width: 640px) {
  .container { padding: 0 16px; }

  /* Nav: hide text labels on mobile, show only icons */
  .nav-open-app span,
  .nav-link span { display: none; }
  .nav-open-app { padding: 8px 10px; }
  .nav-link { padding: 8px 10px; }

  /* Nav touch targets: ensure 44px minimum for iOS */
  .nav-icon-btn { width: 44px; height: 44px; }
  .nav-link { min-height: 44px; }

  /* Hero stats: 4 cols → 2 cols */
  .hero-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px 24px;
    padding: 20px;
  }

  /* Features: 2 cols → 1 col */
  .features-grid { grid-template-columns: 1fr; }

  /* Action buttons stack */
  .actions-row { grid-template-columns: 1fr; }

  /* Grids: collapse */
  .grid-3 { grid-template-columns: 1fr; }
  .grid-2 { grid-template-columns: 1fr; }

  /* Form controls: larger touch targets on mobile */
  .select { min-height: 44px; }
  .btn { min-height: 44px; }
}

/* ----- Small phone (≤ 480px) ----- */
@media (max-width: 480px) {
  .hero-title { font-size: 32px; }
  .hero-sub { font-size: 15px; }

  .panel { padding: 20px; }
  .card { padding: 20px; }

  .step { padding: 24px 20px; }
  .feature-card { padding: 22px; }

  .upload-zone-empty { padding: 28px 16px; }
  .upload-zone-icon { width: 44px; height: 44px; }
}


/* =========================================================
    32. App Page Styles
    ========================================================= */

/* Background noise texture overlay */
.bg-noise {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: var(--noise-opacity);
  background-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 200 200' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' /%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)' /%3E%3C/svg%3E");
  mix-blend-mode: overlay;
}

/* App page body overrides */
.app-main {
  padding-top: calc(var(--nav-h) + 32px);
  padding-bottom: 64px;
  min-height: 100vh;
}

body {
  font-size: 15px;
  line-height: 1.55;
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 20px;
  align-items: start;
}

/* Panel radial gradient overlay */
.panel::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: radial-gradient(circle at top right, var(--accent-soft), transparent 60%);
  opacity: 0.35;
}
[data-theme="light"] .panel::before { opacity: 0.5; }

.panel > * { position: relative; z-index: 1; }

/* Sticky results panel on desktop */
@media (min-width: 961px) {
  .results-panel {
    position: sticky;
    top: calc(var(--nav-h) + 16px);
  }
}

/* Video progress circle overlay */
.video-progress-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 12px;
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border-radius: inherit;
  z-index: 5;
  animation: overlay-in 0.3s var(--ease);
}

@keyframes overlay-in {
  from { opacity: 0; }
  to   { opacity: 1; }
}

.progress-circle-svg {
  width: 100px;
  height: 100px;
  transform: rotate(-90deg);
}

.progress-circle-track {
  fill: none;
  stroke: var(--surface-3);
  stroke-width: 8;
}

.progress-circle-fill {
  fill: none;
  stroke: var(--accent);
  stroke-width: 8;
  stroke-linecap: round;
  stroke-dasharray: 326.73;
  stroke-dashoffset: 326.73;
  transition: stroke-dashoffset 0.4s var(--ease);
  filter: drop-shadow(0 0 6px var(--accent-glow));
}

.progress-circle-text {
  position: absolute;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
}

.progress-circle-pct {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  color: #fff;
  letter-spacing: -0.02em;
}

.progress-circle-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* Soft subtitle notice */
.soft-notice {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin-top: 10px;
  padding: 10px 14px;
  background: color-mix(in srgb, var(--accent-soft) 60%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 20%, transparent);
  border-radius: 10px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-secondary);
  animation: notice-in 0.3s var(--ease);
}

@keyframes notice-in {
  from { opacity: 0; transform: translateY(-4px); }
  to   { opacity: 1; transform: translateY(0); }
}

.soft-notice svg {
  flex-shrink: 0;
  margin-top: 1px;
  color: var(--accent);
}

/* Strong hidden utility (app.html uses !important) */
[hidden] { display: none !important; }

/* Selection with app-compatible variable */
::selection {
  background: var(--selection);
  color: var(--text);
}

/* App grid responsive */
@media (max-width: 960px) {
  .app-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }
}

/* Mobile-specific fixes for iPhone */
@media (max-width: 640px) {
  .app-main {
    padding-top: calc(var(--nav-h) + 16px);
    padding-bottom: 32px;
  }

  .panel {
    padding: 20px 16px;
    border-radius: 14px;
  }

  .mode-toggle {
    border-radius: 10px;
  }

  .mode-btn {
    padding: 10px 10px;
  }

  .accordion {
    border-radius: 10px;
  }

  .accordion-body-inner {
    padding: 0 12px;
  }

  .accordion.open .accordion-body-inner {
    padding: 4px 12px 16px;
  }

  .accordion-header {
    padding: 12px 12px;
    font-size: 13px;
  }

  /* Prevent horizontal overflow in font customization */
  .live-font-preview {
    border-radius: 8px;
  }

  .srt-editor-wrap {
    border-radius: 10px;
  }

  .srt-editor {
    min-height: 160px;
    max-height: 320px;
    font-size: 12px;
  }

  .video-frame,
  .preview-frame {
    border-radius: 10px;
  }

  .upload-zone {
    border-radius: 12px;
  }

  .upload-zone-filled {
    padding: 10px;
  }

  .demo-video-placeholder {
    border-radius: 8px;
  }
}

@media (max-width: 480px) {
  .app-grid {
    gap: 12px;
  }

  .panel {
    padding: 16px 14px;
  }

  .panel-header {
    margin-bottom: 16px;
    padding-bottom: 14px;
  }

  .panel-title {
    font-size: 16px;
  }

  .btn-lg {
    padding: 12px 16px;
    font-size: 14px;
  }

  /* Video meta row: prevent overflow on narrow screens */
  .video-meta {
    flex-wrap: wrap;
  }

  .video-filename {
    min-width: 0;
    max-width: 160px;
  }
}

/* Grid helpers at small breakpoint */
@media (max-width: 520px) {
  .grid-2, .grid-3 {
    grid-template-columns: 1fr;
    gap: 10px;
  }
}

/* Actions row stack at smallest */
@media (max-width: 480px) {
  .actions-row { grid-template-columns: 1fr; }
}

/* =========================================================
    33. App Value Overrides
    ========================================================= */

/* App uses slightly larger buttons */
.btn {
  padding: 11px 18px;
  border-radius: 10px;
}

.btn-lg {
  border-radius: 12px;
}

/* App mode toggle has more gap and different radius */
.mode-toggle {
  gap: 8px;
  border-radius: 12px;
}

.mode-btn.active {
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.2), 0 0 0 1px var(--accent-soft);
}

.mode-btn-sub {
  font-weight: 400;
}

/* App panel uses card shadow instead of sm */
.panel {
  box-shadow: var(--shadow-card);
}

/* App error display has no left border accent */
.error-display {
  background: var(--danger-soft);
  border-color: var(--danger-border);
  border-left: 1px solid var(--danger-border);
  color: var(--danger);
}

.error-display p { color: var(--danger); }

/* App btn-text danger uses short aliases */
.btn-text:hover {
  color: var(--danger);
  border-color: var(--danger-border);
  background: var(--danger-soft);
}

/* App srt editor wrap radius */
.srt-editor-wrap {
  border-radius: 12px;
}

/* App form controls use 10px radius instead of 8px */
.select {
  border-radius: 10px;
}

.video-player {
  border-radius: 10px;
}

.color-picker,
.color-hex {
  border-radius: 10px;
}

.upload-zone {
  border-radius: 14px;
}

.upload-zone-icon {
  border-radius: 14px;
}

/* App slider track uses surface-3 */
.slider::-webkit-slider-runnable-track {
  background: var(--surface-3);
}

.slider::-moz-range-track {
  background: var(--surface-3);
}

.accordion {
  border-radius: 12px;
}

/* App nav-link uses 8px radius */
.nav-link {
  gap: 6px;
  padding: 8px 12px;
  border-radius: 8px;
}

.nav-icon-btn {
  border-radius: 8px;
}

.nav-brand-mark {
  border-radius: 8px;
}

/* App bg-mesh uses lower opacity */
.bg-mesh::before,
.bg-mesh::after {
  opacity: 0.3;
}

[data-theme="light"] .bg-mesh::before { opacity: 0.16; }
[data-theme="light"] .bg-mesh::after { opacity: 0.12; }

/* App video/preview frames use 12px radius */
.video-frame,
.preview-frame {
  border-radius: 12px;
}

/* App empty state icons use 12px radius */
.video-empty-icon {
  border-radius: 12px;
}

/* ── App footer hint (server reminder) ─────────────────── */
.app-footer-hint {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  padding: 20px 0 8px;
  font-family: 'JetBrains Mono', monospace;
  font-size: 11px;
  color: var(--color-text-tertiary);
  user-select: none;
}
.app-footer-hint kbd {
  display: inline-block;
  padding: 1px 5px;
  border: 1px solid var(--color-border);
  border-radius: 4px;
  background: var(--color-surface);
  font-family: inherit;
  font-size: 10px;
  line-height: 1.5;
  color: var(--color-text-secondary);
}
.app-footer-hint code {
  font-family: inherit;
  font-size: 10px;
  color: var(--color-accent);
  background: var(--accent-soft);
  padding: 1px 5px;
  border-radius: 3px;
}
[data-theme="light"] .app-footer-hint code {
  background: rgba(5, 150, 105, 0.08);
}