/* ============================================================
   DeepSync — design tokens
   ============================================================ */
:root {
  /* surfaces: dark, cool-neutral, stepped from base -> elevated */
  --surface-0: #05070a;   /* page background */
  --surface-1: #0a0d12;   /* default card */
  --surface-2: #12161d;   /* elevated card / topbar / hover */
  --surface-3: #1a1f29;   /* hover-on-elevated / active */
  --surface-4: #232936;   /* rare, deepest step */

  --border-hairline: rgba(255, 255, 255, 0.08);
  --border-hairline-strong: rgba(255, 255, 255, 0.16);

  --text-primary: #e9ecf2;
  --text-secondary: #9aa3b2;
  --text-tertiary: #616b7a;

  --accent-teal: #2fd1c4;
  --accent-teal-dim: rgba(47, 209, 196, 0.14);
  --accent-teal-glow: rgba(47, 209, 196, 0.24);
  --accent-amber: #ff8a3d;
  --accent-amber-dim: rgba(255, 138, 61, 0.14);
  --accent-amber-glow: rgba(255, 138, 61, 0.22);

  --style-formal: #5b7fb5;
  --style-sarcastic: #d9a227;
  --style-humorous-tech: #3fb950;
  --style-humorous-non-tech: #ff6b81;

  --font-heading: "Sora", sans-serif;
  --font-body: "Manrope", sans-serif;
  --font-mono: "IBM Plex Mono", monospace;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-8: 32px;
  --space-10: 40px;
  --space-12: 48px;
  --space-16: 64px;
  --space-20: 80px;

  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 999px;

  --ease-precise: cubic-bezier(0.2, 0.8, 0.2, 1);
  --dur-fast: 120ms;
  --dur-base: 200ms;
  --dur-slow: 280ms;
  --stagger-step: 70ms;
}

/* ============================================================
   Reset / base
   ============================================================ */
* { box-sizing: border-box; }
html, body { height: 100%; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  overflow-x: hidden;
  background: var(--surface-0);
  background-image: linear-gradient(180deg, var(--surface-0) 0%, #070a0f 60%, var(--surface-2) 140%);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { font-family: var(--font-heading); margin: 0; letter-spacing: -0.01em; }
p { margin: 0; }
button { font-family: inherit; }
::selection { background: var(--accent-teal-dim); color: var(--text-primary); }

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

.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   Scroll-reveal utility (IntersectionObserver adds .is-revealed)
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur-slow) var(--ease-precise),
              transform var(--dur-slow) var(--ease-precise);
  transition-delay: calc(var(--stagger-index, 0) * var(--stagger-step));
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================================
   Top bar — slim, scroll-aware
   ============================================================ */
.topbar {
  display: flex;
  align-items: center;
  padding: var(--space-4) var(--space-8);
  border-bottom: 1px solid transparent;
  background: transparent;
  position: sticky;
  top: 0;
  z-index: 20;
  transition: border-color var(--dur-slow) var(--ease-precise),
              background-color var(--dur-slow) var(--ease-precise),
              backdrop-filter var(--dur-slow) var(--ease-precise);
}
.topbar.is-scrolled {
  border-color: var(--border-hairline);
  background: rgba(9, 11, 15, 0.72);
  backdrop-filter: blur(10px);
}
.topbar__brand {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.mono-tag {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--text-secondary);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
}

/* ============================================================
   Layout
   ============================================================ */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: var(--space-10) var(--space-8) var(--space-12);
}
@media (max-width: 640px) {
  .container { padding: var(--space-6) var(--space-4) var(--space-8); }
}

.section-head { margin-bottom: var(--space-8); }
.section-head h2 { font-size: 28px; font-weight: 700; color: var(--text-primary); letter-spacing: -0.015em; }
.section-head p {
  margin-top: var(--space-3);
  color: var(--text-secondary);
  font-size: 14.5px;
  max-width: 56ch;
  line-height: 1.6;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  position: relative;
  padding: var(--space-20) var(--space-8) var(--space-16);
  max-width: 1040px;
  margin: 0 auto;
  overflow: hidden;
  text-align: center;
}
.hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}
.hero__glow {
  position: absolute;
  top: -10%;
  left: 50%;
  width: 900px;
  height: 640px;
  transform: translateX(-50%);
  background:
    radial-gradient(circle at 38% 30%, var(--accent-teal-glow) 0%, transparent 55%),
    radial-gradient(circle at 66% 42%, var(--accent-amber-glow) 0%, transparent 52%);
  filter: blur(40px);
  opacity: 0.55;
}
.hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border-hairline) 1px, transparent 1px),
    linear-gradient(90deg, var(--border-hairline) 1px, transparent 1px);
  background-size: 48px 48px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, black 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse 70% 60% at 50% 20%, black 30%, transparent 75%);
}
.hero__content { position: relative; z-index: 1; }
.hero__eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
}
.hero__headline {
  font-size: clamp(32px, 5.2vw, 54px);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  max-width: 18ch;
  margin: 0 auto;
}
.hero__subhead {
  margin: var(--space-5) auto 0;
  max-width: 56ch;
  font-size: 16.5px;
  line-height: 1.65;
  color: var(--text-secondary);
}
.hero__chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-2);
  margin-top: var(--space-8);
}
.hero__chip {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--style-color);
  background: color-mix(in srgb, var(--style-color) 12%, transparent);
  border: 1px solid color-mix(in srgb, var(--style-color) 30%, transparent);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-2);
}
.hero__chip svg { width: 13px; height: 13px; }
.hero__cta-row { margin-top: var(--space-10); }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  border-radius: var(--radius-md);
  padding: 0 var(--space-5);
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color var(--dur-base) var(--ease-precise),
              border-color var(--dur-base) var(--ease-precise),
              box-shadow var(--dur-base) var(--ease-precise),
              transform var(--dur-fast) var(--ease-precise),
              opacity var(--dur-base) var(--ease-precise);
}
.btn:active { transform: scale(0.98); }
.btn-secondary {
  background: var(--surface-1);
  border-color: var(--border-hairline);
  color: var(--text-primary);
  height: 40px;
}
.btn-secondary:hover { background: var(--surface-2); border-color: var(--border-hairline-strong); }

.btn-primary {
  height: 46px;
  padding: 0 var(--space-6);
  background: var(--accent-teal-dim);
  border-color: color-mix(in srgb, var(--accent-teal) 45%, transparent);
  color: var(--accent-teal);
  font-weight: 700;
  font-size: 14px;
}
.btn-primary:hover {
  background: color-mix(in srgb, var(--accent-teal) 22%, transparent);
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 4px var(--accent-teal-dim);
}

/* ============================================================
   Composer — URL input
   ============================================================ */
.url-row {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
}
.url-input-wrap {
  flex: 1;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  background: var(--surface-1);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: 0 var(--space-4);
  transition: border-color var(--dur-base) var(--ease-precise), box-shadow var(--dur-base) var(--ease-precise);
}
.url-input-wrap:focus-within {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-dim);
}
.url-input-wrap svg { width: 16px; height: 16px; color: var(--text-tertiary); flex-shrink: 0; }
.url-input-wrap input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 14px;
  padding: var(--space-3) 0;
}
.url-input-wrap input::placeholder { color: var(--text-tertiary); }

/* ============================================================
   Composer — FileDropzone
   ============================================================ */
.dropzone {
  border: 1px dashed var(--border-hairline-strong);
  border-radius: var(--radius-lg);
  padding: var(--space-8);
  text-align: center;
  color: var(--text-secondary);
  margin-bottom: var(--space-6);
  transition: border-color var(--dur-base) var(--ease-precise),
              background-color var(--dur-base) var(--ease-precise);
  cursor: pointer;
}
.dropzone:hover { border-color: var(--border-hairline-strong); background: var(--surface-1); }
.dropzone svg { width: 22px; height: 22px; color: var(--text-tertiary); margin-bottom: var(--space-3); }
.dropzone strong { color: var(--text-primary); font-weight: 600; }
.dropzone small { display: block; margin-top: var(--space-1); font-size: 12.5px; color: var(--text-tertiary); }
.dropzone.is-dragover {
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
  color: var(--text-primary);
}
.dropzone input[type="file"] { display: none; }
.dropzone.is-disabled {
  cursor: not-allowed;
  opacity: 0.5;
}
.dropzone.is-disabled:hover { border-color: var(--border-hairline-strong); background: none; }
.upload-error {
  font-size: 13px;
  color: var(--style-sarcastic);
  margin: calc(-1 * var(--space-3)) 0 var(--space-6);
}

/* ============================================================
   Composer — queued clips list
   ============================================================ */
.queue-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-tertiary);
  margin-bottom: var(--space-3);
}
.queue-list { display: flex; flex-direction: column; gap: var(--space-2); margin-bottom: var(--space-8); }
.upload-row {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  background: var(--surface-1);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4);
  animation: fade-in var(--dur-base) var(--ease-precise);
  transition: background-color var(--dur-base) var(--ease-precise), border-color var(--dur-base) var(--ease-precise);
}
.upload-row:hover { background: var(--surface-2); border-color: var(--border-hairline-strong); }
@keyframes fade-in {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}
.upload-row__thumb {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  background: var(--surface-2);
  border: 1px solid var(--border-hairline);
  flex-shrink: 0;
}
.upload-row__meta { flex: 1; min-width: 0; }
.upload-row__name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.upload-row__source { font-size: 12px; color: var(--text-tertiary); margin-top: 2px; }
.upload-row__duration {
  font-family: var(--font-mono);
  font-size: 12.5px;
  color: var(--text-secondary);
  flex-shrink: 0;
}
.upload-row__remove {
  background: none;
  border: none;
  color: var(--text-tertiary);
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--dur-fast) var(--ease-precise), background-color var(--dur-fast) var(--ease-precise);
}
.upload-row__remove:hover { color: var(--text-primary); background: var(--surface-3); }

.queue-empty {
  color: var(--text-tertiary);
  font-size: 13px;
  padding: var(--space-4) 0;
  margin-bottom: var(--space-8);
}

/* ============================================================
   Composer — Generate CTA
   ============================================================ */
.composer-card {
  background: var(--surface-1);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  transition: border-color var(--dur-base) var(--ease-precise);
}
.composer-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-hairline);
}
.composer-card--error { border-color: color-mix(in srgb, var(--style-sarcastic) 40%, var(--border-hairline)); }
.error-message {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-2);
}
.composer-footer__note { font-size: 12.5px; color: var(--text-tertiary); max-width: 42ch; }
@media (max-width: 560px) {
  .composer-footer { flex-direction: column; align-items: stretch; }
  .btn-generate { width: 100%; }
}
.btn-generate {
  background: var(--accent-amber);
  color: #1a0f05;
  border-color: var(--accent-amber);
  font-weight: 700;
  padding: 0 var(--space-6);
  height: 44px;
  flex-shrink: 0;
}
.btn-generate:hover:not(:disabled) {
  background: #ff9c5c;
  box-shadow: 0 0 0 4px var(--accent-amber-dim);
}
.btn-generate:disabled {
  background: var(--surface-2);
  border-color: var(--border-hairline);
  color: var(--text-tertiary);
  cursor: not-allowed;
}

/* ============================================================
   Pipeline progress (rendered inline inside .composer-card)
   ============================================================ */
.pipeline__stages { display: flex; flex-direction: column; gap: var(--space-4); margin-bottom: var(--space-6); }
.stage-item {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  opacity: 0.38;
  transition: opacity var(--dur-slow) var(--ease-precise);
}
.stage-item.is-active,
.stage-item.is-done { opacity: 1; }
.stage-item__dot {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 1.5px solid var(--border-hairline-strong);
  flex-shrink: 0;
  position: relative;
  transition: border-color var(--dur-base) var(--ease-precise), background-color var(--dur-base) var(--ease-precise);
}
.stage-item.is-active .stage-item__dot {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-dim);
  animation: pulse-glow 1.4s var(--ease-precise) infinite;
}
@keyframes pulse-glow {
  0%, 100% { box-shadow: 0 0 0 3px var(--accent-teal-dim); }
  50% { box-shadow: 0 0 0 6px var(--accent-teal-dim); }
}
.stage-item.is-done .stage-item__dot {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  animation: none;
}
.stage-item.is-done .stage-item__dot::after {
  content: "";
  position: absolute;
  left: 5px; top: 2px;
  width: 5px; height: 9px;
  border-right: 1.5px solid #05070a;
  border-bottom: 1.5px solid #05070a;
  transform: rotate(45deg);
}
.stage-item__label {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text-primary);
  transition: color var(--dur-base) var(--ease-precise);
}
.stage-item__label .sep { color: var(--text-tertiary); margin: 0 var(--space-1); }

.progress-track {
  height: 3px;
  background: var(--surface-2);
  border-radius: var(--radius-pill);
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  width: 0%;
  background: var(--accent-teal);
  border-radius: var(--radius-pill);
  transition: width 700ms var(--ease-precise);
}

/* ============================================================
   Results — VideoCard
   ============================================================ */
.result-block { margin-bottom: var(--space-10); }
.video-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  background: var(--surface-1);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  margin-bottom: var(--space-4);
  transition: border-color var(--dur-base) var(--ease-precise);
}
.video-card:hover { border-color: var(--border-hairline-strong); }
.video-card__thumb {
  width: 100%;
  aspect-ratio: 16 / 9;
  max-height: 420px;
  border-radius: var(--radius-md);
  background: var(--surface-2);
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
}
.video-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.video-card__thumb svg { width: 26px; height: 26px; color: var(--text-secondary); }
.video-card__player {
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
  object-fit: contain;
}
.video-card__duration {
  position: absolute;
  top: 4px; right: 6px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  color: var(--text-primary);
  background: rgba(5, 7, 10, 0.75);
  border-radius: var(--radius-sm);
  padding: 1px 5px;
  pointer-events: none;
}
.video-card__name {
  font-family: var(--font-mono);
  font-size: 13.5px;
  color: var(--text-primary);
}
.video-card__task-id { font-size: 12px; color: var(--text-tertiary); margin-top: 2px; }
.fallback-badge {
  font-size: 11px;
  color: var(--style-sarcastic);
  border: 1px solid color-mix(in srgb, var(--style-sarcastic) 40%, transparent);
  background: color-mix(in srgb, var(--style-sarcastic) 12%, transparent);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3);
  white-space: nowrap;
  flex-shrink: 0;
  margin-left: auto;
}

/* ============================================================
   Results — CaptionCard grid
   ============================================================ */
.caption-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
}
@media (max-width: 640px) {
  .caption-grid { grid-template-columns: 1fr; }
}
.caption-card {
  background: var(--surface-1);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-lg);
  overflow: hidden;
  opacity: 0;
  transform: translateY(10px);
  transition: background-color var(--dur-base) var(--ease-precise),
              border-color var(--dur-base) var(--ease-precise),
              opacity var(--dur-slow) var(--ease-precise),
              transform var(--dur-slow) var(--ease-precise);
  transition-delay: calc(var(--stagger-index, 0) * var(--stagger-step));
}
.caption-card.is-revealed { opacity: 1; transform: translateY(0); }
.caption-card:hover {
  background: var(--surface-2);
  border-color: color-mix(in srgb, var(--style-color, var(--border-hairline-strong)) 40%, var(--border-hairline-strong));
}
.caption-card__header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--border-hairline);
  border-top: 3px solid var(--style-color, var(--border-hairline));
}
.style-tag {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.02em;
  color: var(--style-color, var(--text-secondary));
  background: color-mix(in srgb, var(--style-color, transparent) 14%, transparent);
  border-radius: var(--radius-pill);
  padding: var(--space-1) var(--space-3) var(--space-1) var(--space-2);
}
.style-tag svg { width: 14px; height: 14px; }
.caption-card__body {
  padding: var(--space-5);
  min-height: 84px;
  display: flex;
  align-items: center;
}
.caption-card__text { font-size: 14px; color: var(--text-primary); line-height: 1.55; }
.caption-card__empty { font-size: 13px; color: var(--text-tertiary); font-style: normal; }

/* ============================================================
   Results footer / back action
   ============================================================ */
.results-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: var(--space-10);
  padding-top: var(--space-6);
  border-top: 1px solid var(--border-hairline);
}
.link-action {
  color: var(--accent-teal);
  background: none;
  border: none;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 13.5px;
  cursor: pointer;
  padding: var(--space-2) 0;
  transition: opacity var(--dur-fast) var(--ease-precise);
}
.link-action:hover { opacity: 0.8; }

/* ============================================================
   Section dividers
   ============================================================ */
.section-divider {
  height: 1px;
  background: var(--border-hairline);
  max-width: 960px;
  margin: 0 auto;
}