/* ============ Light Video Editor — dark editor theme ============ */
:root {
  --bg: #14161a;
  --bg2: #1b1e24;
  --bg3: #23272f;
  --line: #2e333d;
  --fg: #e8eaf0;
  --dim: #9aa3b2;
  --accent: #4f8cff;
  --accent2: #35c98e;
  --danger: #ff5d5d;
  --radius: 10px;
  --dock-h: 0px; /* mobile tool-dock height — overridden in the mobile media query */
  --font: system-ui, "Segoe UI", "Noto Sans Myanmar", "Myanmar Text", "Pyidaungsu", sans-serif;
  color-scheme: dark;
}

* {
  box-sizing: border-box;
  -webkit-tap-highlight-color: transparent;
}
[hidden] { display: none !important; }
html, body { height: 100%; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--font);
  background: var(--bg);
  color: var(--fg);
  font-size: 14px;
  display: grid;
  grid-template-rows: auto 1fr;
  grid-template-columns: minmax(0, 1fr); /* content must never force horizontal overflow */
  overflow: hidden;
  overscroll-behavior: none;
}
button, label.btn { touch-action: manipulation; }

/* ---------------- topbar ---------------- */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 8px 14px;
  background: var(--bg2);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 8px; font-weight: 700; }
.brand-logo { color: var(--accent); font-size: 20px; }
.brand-name em { font-style: normal; color: var(--dim); font-weight: 500; }
.topbar-actions { display: flex; gap: 8px; }

/* ---------------- buttons ---------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 7px 12px;
  background: var(--bg3);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 8px;
  cursor: pointer;
  font-family: inherit;
  font-size: 13px;
  transition: background .15s, border-color .15s, opacity .15s;
  user-select: none;
}
.btn:hover:not(:disabled) { background: #2b303a; border-color: #3d4452; }
.btn:active:not(:disabled) { transform: translateY(1px); }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.btn-primary { background: var(--accent); border-color: var(--accent); color: #fff; }
.btn-primary:hover { background: #3d7bf0; }
.btn-accent { background: var(--accent2); border-color: var(--accent2); color: #06281c; font-weight: 700; }
.btn-accent:hover { background: #2bb882; }
.btn-danger { color: #ff8a8a; }
.btn-danger:hover:not(:disabled) { background: #3a2426; border-color: #59383c; }
.btn-small { padding: 5px 9px; font-size: 12.5px; }
.btn-mini { padding: 2px 7px; font-size: 12px; }
.btn-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; margin: 8px 0; }
.icon-btn {
  background: none;
  border: none;
  color: var(--fg);
  font-size: 17px;
  cursor: pointer;
  padding: 4px 7px;
  border-radius: 6px;
}
.icon-btn:hover { background: var(--bg3); }
kbd {
  background: var(--bg3);
  border: 1px solid var(--line);
  border-bottom-width: 2px;
  border-radius: 4px;
  padding: 0 5px;
  font-size: 11px;
  font-family: inherit;
}

/* ---------------- layout ---------------- */
.layout {
  display: grid;
  grid-template-columns: 350px minmax(0, 1fr);
  min-height: 0;
  min-width: 0;
}
.panel {
  background: var(--bg2);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  min-height: 0;
  min-width: 0;
}
.stage {
  display: grid;
  grid-template-rows: 1fr auto auto;
  /* Constrain the implicit column: without this the timeline's scroll
     content sized the column past the container, pushing the preview,
     transport and timeline off the right edge of the screen. */
  grid-template-columns: minmax(0, 1fr);
  min-height: 0;
  min-width: 0;
}

/* ---------------- tabs ---------------- */
.tabs {
  display: flex;
  overflow-x: auto;
  border-bottom: 1px solid var(--line);
  position: sticky;
  top: 0;
  background: var(--bg2);
  z-index: 5;
}
.tab-btn {
  flex: 1;
  padding: 9px 6px;
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  color: var(--dim);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  white-space: nowrap;
}
.tab-btn:hover { color: var(--fg); }
.tab-btn.active { color: var(--fg); border-bottom-color: var(--accent); font-weight: 700; }
.tab { display: none; padding: 12px; }
.tab.active { display: block; }

/* ---------------- generic form ---------------- */
.row { display: flex; align-items: center; gap: 8px; margin: 8px 0; flex-wrap: wrap; }
.row.end { justify-content: flex-end; }
.space-between { justify-content: space-between; }
.label { font-size: 12.5px; color: var(--dim); }
.dim { color: var(--dim); font-weight: 400; font-size: 12px; }
.hint {
  font-size: 12px;
  color: var(--dim);
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 9px;
  margin: 6px 0;
  line-height: 1.6;
}
.hint.dim { background: none; border: none; padding: 4px 2px; }
.field {
  display: flex;
  flex-direction: column;
  gap: 3px;
  font-size: 12.5px;
  color: var(--dim);
  margin: 6px 0;
}
.field > span { display: flex; justify-content: space-between; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 4px 10px; }
.span2 { grid-column: span 2; }
.checks { flex-direction: row; gap: 12px; flex-wrap: wrap; margin-top: 6px; }
.checks label { display: flex; gap: 5px; align-items: center; color: var(--fg); }
input[type="range"] { width: 100%; accent-color: var(--accent); }
input[type="color"] {
  width: 100%;
  height: 30px;
  padding: 1px 2px;
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 6px;
}
input[type="number"], input[type="text"], select, textarea {
  background: var(--bg3);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 6px;
  padding: 6px 8px;
  font-family: inherit;
  font-size: 13px;
}
input:focus, select:focus, textarea:focus { outline: 1px solid var(--accent); }
.num { width: 90px; }
.num.narrow { width: 70px; }
output { font-size: 11.5px; color: var(--fg); text-align: right; }
.box {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 4px 10px 8px;
  margin: 8px 0;
  background: #191c21;
}
.box summary { cursor: pointer; padding: 6px 0; font-weight: 700; font-size: 13px; }
.empty {
  color: var(--dim);
  font-size: 12.5px;
  text-align: center;
  padding: 14px 6px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  margin: 8px 0;
}
.list { display: flex; flex-direction: column; gap: 6px; }

/* list rows (segments, cues, tracks, overlays, fonts) */
.item {
  background: var(--bg3);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 7px 8px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.item.selected { border-color: var(--accent); box-shadow: 0 0 0 1px var(--accent); }
.item.active { border-color: var(--accent2); }
.item-head { display: flex; align-items: center; gap: 6px; justify-content: space-between; }
.item-title { font-size: 12.5px; font-weight: 700; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.item-sub { color: var(--dim); font-size: 12px; }
.item-actions { display: flex; gap: 4px; flex-shrink: 0; }
.item textarea {
  width: 100%;
  min-height: 44px;
  resize: vertical;
  line-height: 1.6;
}
.time-inputs { display: flex; gap: 5px; align-items: center; }
.time-inputs input { width: 104px; font-size: 12px; padding: 4px 6px; }
.time-inputs .arrow { color: var(--dim); }

/* ---------------- viewport ---------------- */
.viewport {
  position: relative;
  background:
    radial-gradient(1200px 500px at 50% -10%, #1d2433 0%, transparent 60%),
    #0b0c0f;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  overflow: hidden;
}
.vp-box {
  position: relative;
  background: #000;
  box-shadow: 0 6px 30px rgba(0, 0, 0, .5);
  border-radius: 4px;
  overflow: hidden;
}
.vp-box video {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  background: #000;
}
.vp-box .vp-video {
  object-fit: contain;
  display: none; /* source elements stay hidden until the active clip is shown */
}
.vp-box canvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  cursor: default;
}
.placeholder {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--dim);
}
.placeholder.hidden { display: none; }
.ph-inner {
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: center;
  border: 2px dashed var(--line);
  padding: 36px 48px;
  border-radius: 16px;
}
.ph-icon { font-size: 42px; }

/* ---------------- transport ---------------- */
.transport {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 12px;
  background: var(--bg2);
  border-top: 1px solid var(--line);
  min-width: 0;
}
.time { font-variant-numeric: tabular-nums; font-size: 13px; min-width: 130px; }
.seek { flex: 1; min-width: 60px; }

/* ---------------- timeline ---------------- */
.timeline {
  position: relative;
  background: #101216;
  border-top: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  user-select: none;
  max-height: min(45vh, 340px);
}
.tl-tools {
  flex: none;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-bottom: 1px solid var(--line);
}
.tl-zoom-label {
  min-width: 52px;
  text-align: center;
  font-size: 11px;
  color: var(--dim);
  background: transparent;
  border: 0;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
}
.tl-scroll {
  overflow: auto;
  padding: 4px 10px 8px;
  scrollbar-width: thin;
  scrollbar-color: #333a46 transparent;
}
.tl-inner {
  position: relative;
  min-width: 100%;
}
.tl-ruler {
  position: relative;
  height: 22px;
  border-bottom: 1px solid var(--line);
  cursor: pointer;
}
.tl-tick {
  position: absolute;
  top: 0;
  height: 100%;
  border-left: 1px solid var(--line);
  padding-left: 4px;
  font-size: 10.5px;
  color: var(--dim);
  pointer-events: none;
}
.tl-lane {
  position: relative;
  height: 34px; /* = 6px padding + one ROW_H(28) row — matches timeline-ui.js */
  margin-top: 4px;
  background: var(--bg3);
  border-radius: 6px;
  cursor: pointer;
  overflow: hidden;
}
.tl-lane.lane-overlay,
.tl-lane.lane-audio {
  height: auto;
  min-height: 34px;
}
.tl-sub-lane {
  position: relative;
  height: 12px;
  margin-top: 4px;
  background: var(--bg3);
  border-radius: 6px;
  overflow: hidden;
}
.seg {
  position: absolute;
  top: 0;
  bottom: 0;
  background: linear-gradient(#3b6fd4, #2f5cb5);
  border-radius: 4px;
  display: flex;
  align-items: center;
  padding: 0 4px;
  font-size: 10.5px;
  color: #dbe7ff;
  overflow: hidden;
  white-space: nowrap;
  cursor: grab;
}
.seg.at-playhead { background: linear-gradient(#5b8df0, #3f6fd8); }
.seg.dragging {
  cursor: grabbing;
  box-shadow: 0 0 0 2px #fff;
  z-index: 5;
  opacity: .92;
}
.seg .handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 7px;
  cursor: ew-resize;
  background: rgba(0, 0, 0, .25);
  z-index: 2;
}
.seg .handle.l { left: 0; border-radius: 4px 0 0 4px; }
.seg .handle.r { right: 0; border-radius: 0 4px 4px 0; }
.seg .seg-label {
  pointer-events: none;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.drop-line {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 2px;
  background: #ffd166;
  z-index: 6;
  pointer-events: none;
}
.drop-line.horizontal {
  left: 0;
  right: 0;
  width: auto;
  height: 2px;
}
.bar {
  position: absolute;
  border-radius: 5px;
  background: #8a5cf6;
  font-size: 10.5px;
  color: #fff;
  display: flex;
  align-items: center;
  gap: 3px;
  padding: 0 4px;
  overflow: hidden;
  white-space: nowrap;
  cursor: grab;
}
.bar.audio { background: #d99a2b; }
.bar.selected { outline: 2px solid #fff; z-index: 3; }
.bar.dragging {
  cursor: grabbing;
  opacity: .9;
  box-shadow: 0 0 0 2px #fff;
}
.bar .grip {
  flex: none;
  cursor: grab;
  font-size: 11px;
  letter-spacing: -2px;
  opacity: .8;
  user-select: none;
}
.bar .handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 7px;
  cursor: ew-resize;
}
.bar .handle.l { left: 0; }
.bar .handle.r { right: 0; }
.bar .bar-label {
  pointer-events: none;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
}
.sub-cue {
  position: absolute;
  top: 1px;
  bottom: 1px;
  background: var(--accent2);
  border-radius: 3px;
  min-width: 2px;
}
.sub-cue.active { background: #7dffd0; }
.tl-playhead {
  position: absolute;
  top: 4px;
  bottom: 6px;
  width: 0;
  border-left: 2px solid #ff5d5d;
  pointer-events: none;
  z-index: 4;
}
.tl-playhead::before {
  content: "";
  position: absolute;
  top: -1px;
  left: -6px;
  border: 6px solid transparent;
  border-top-color: #ff5d5d;
}

/* ---------------- overlay props ---------------- */
.props {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 8px 10px;
  margin-top: 10px;
  background: #191c21;
}

/* ---------------- export dialog ---------------- */
dialog {
  background: var(--bg2);
  color: var(--fg);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 0;
  width: min(430px, 92vw);
  max-height: 90vh;
  overflow: auto;
}
dialog::backdrop { background: rgba(0, 0, 0, .6); backdrop-filter: blur(2px); }
.dlg { padding: 18px; display: flex; flex-direction: column; gap: 8px; }
.dlg h3 { margin: 0 0 6px; font-size: 16px; }

.exp-card {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 50;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 12px 14px;
  width: 300px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, .5);
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.exp-title { font-weight: 700; font-size: 13px; }
.exp-bar {
  height: 10px;
  background: var(--bg3);
  border-radius: 6px;
  overflow: hidden;
}
#expBar {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent), var(--accent2));
  transition: width .3s;
}
.exp-meta { font-size: 12px; color: var(--dim); }

/* ---------------- toast ---------------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 26px;
  transform: translateX(-50%);
  background: #232833;
  border: 1px solid var(--line);
  color: var(--fg);
  border-radius: 10px;
  padding: 10px 16px;
  font-size: 13.5px;
  z-index: 60;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .45);
  max-width: 80vw;
}
.toast.error { border-color: var(--danger); }
.toast a { color: var(--accent); }

/* ---------------- exporting lock ---------------- */
body.exporting .panel,
body.exporting .transport,
body.exporting .timeline { pointer-events: none; opacity: .75; }
body.exporting #exportBtn { display: none; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: #333a46; border-radius: 6px; }
::-webkit-scrollbar-track { background: transparent; }

/* ============================================================
   Native-editor polish (all sizes)
   ============================================================ */
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-label { display: inline; }
#expName { width: 100%; }
.transport #playBtn { font-size: 20px; padding: 6px 12px; }

/* depth on timeline clips — reads like a real NLE track */
.seg { border: 1px solid rgba(255, 255, 255, .14); box-shadow: inset 0 1px 0 rgba(255, 255, 255, .16); }
.bar { border: 1px solid rgba(255, 255, 255, .14); }

/* drag surfaces must not scroll/zoom the page mid-drag (touch) */
.tl-ruler, .tl-lane, .tl-sub-lane, .seg, .bar, #canvas { touch-action: none; }
.tl-scroll { overscroll-behavior: contain; -webkit-overflow-scrolling: touch; }

/* mobile-only elements */
.sheet-handle, .vp-play { display: none; }

dialog[open] { animation: dlg-in .16s ease-out; }
@keyframes dlg-in {
  from { opacity: 0; transform: translateY(10px) scale(.985); }
}
.toast { animation: toast-in .22s ease-out; }
@keyframes toast-in {
  from { opacity: 0; transform: translate(-50%, 12px); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}

/* ============================================================
   Mobile / touch layout — bottom-sheet tools (CapCut-style)
   <=860px: stage fills the screen, tools become a slide-up sheet
   whose collapsed strip (handle + tab bar) is a fixed bottom dock.
   ============================================================ */
@media (max-width: 860px) {
  :root { --dock-h: 70px; } /* 16px handle + 54px tab bar */

  /* ---- topbar: compact, icon-first ---- */
  .topbar { padding: 6px 8px calc(6px + env(safe-area-inset-top, 0px)); gap: 6px; }
  .topbar-actions { gap: 5px; }
  .brand { gap: 5px; }
  .brand-logo { font-size: 18px; }
  .brand-name { font-size: 13px; }
  .brand-name em { display: none; }
  .topbar .btn { padding: 9px 10px; min-height: 42px; font-size: 15px; }
  .btn-label:not(.keep-mobile) { display: none; }

  /* ---- layout: full-width stage; panel leaves the flow ---- */
  .layout { display: flex; flex-direction: column; }
  .stage {
    flex: 1;
    min-height: 0;
    min-width: 0;
    padding-bottom: calc(var(--dock-h) + env(safe-area-inset-bottom, 0px));
  }

  /* ---- tools = slide-up bottom sheet ---- */
  .panel {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    top: auto;
    width: auto;
    height: min(52vh, 440px);
    height: min(52dvh, 440px);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-right: none;
    border-top: 1px solid var(--line);
    border-radius: 16px 16px 0 0;
    padding-bottom: env(safe-area-inset-bottom, 0px);
    box-shadow: 0 -14px 40px rgba(0, 0, 0, .55);
    transform: translateY(calc(100% - var(--dock-h)));
    transition: transform .28s cubic-bezier(.2, .8, .2, 1);
    z-index: 40;
  }
  .panel.open { transform: translateY(0); }

  .sheet-handle {
    display: flex;
    flex: none;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 16px;
    padding: 0;
    background: none;
    border: none;
    cursor: pointer;
  }
  .sheet-handle span {
    width: 40px;
    height: 4px;
    border-radius: 99px;
    background: #4b5261;
  }

  .tabs {
    position: static;
    flex: none;
    height: 54px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
  }
  .tabs::-webkit-scrollbar { display: none; }
  .tab-btn { padding: 8px 2px; font-size: 11.5px; }
  .tab {
    flex: 1 1 auto;
    min-height: 0;
    overflow-y: auto;
    overscroll-behavior: contain;
    -webkit-overflow-scrolling: touch;
  }

  /* ---- transport: touch-sized ---- */
  .transport { padding: 6px 8px; gap: 6px; }
  .time { min-width: 0; font-size: 12.5px; }
  .seek { min-height: 32px; }
  .icon-btn { padding: 7px 9px; font-size: 18px; }
  .btn:not(.btn-mini) { min-height: 40px; }
  .btn-mini { padding: 5px 9px; min-height: 30px; }

  /* ---- timeline: chunkier lanes, bigger trim handles ---- */
  .timeline { max-height: min(42vh, 320px); }
  .tl-tools { padding: 4px 8px; gap: 4px; }
  .tl-tools .icon-btn, .tl-tools .tl-zoom-label { min-height: 34px; }
  .tl-ruler { height: 26px; }
  .tl-sub-lane { height: 14px; }
  .seg { font-size: 11px; }
  .seg .handle, .bar .handle { width: 13px; }
  .bar .grip { padding: 0 7px; font-size: 12px; }

  /* ---- preview play control — only while the sheet covers transport ---- */
  .vp-play {
    position: absolute;
    top: 10px;
    right: 10px;
    width: 46px;
    height: 46px;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    background: rgba(14, 16, 22, .6);
    border: 1px solid rgba(255, 255, 255, .2);
    color: #fff;
    font-size: 17px;
    padding: 0;
    cursor: pointer;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    z-index: 6;
  }
  .panel.open ~ .stage .placeholder.hidden ~ .vp-play { display: flex; }

  /* ---- misc mobile ---- */
  .hint.dim { display: none; } /* keyboard shortcuts — no keyboard on touch */
  .ph-inner { padding: 22px 26px; }
  .ph-icon { font-size: 34px; }
  .toast { bottom: calc(var(--dock-h) + env(safe-area-inset-bottom, 0px) + 12px); }
  .exp-card { left: 10px; right: 10px; width: auto; bottom: calc(var(--dock-h) + env(safe-area-inset-bottom, 0px) + 10px); }
  .dlg { padding: 14px; }
  /* iOS zooms the page when a focused text input is <16px */
  input[type="number"], input[type="text"], select, textarea { font-size: 16px; }
}

/* ---- very narrow phones: give the scrubber room ---- */
@media (max-width: 640px) {
  #backBtn, #fwdBtn { display: none; }
}

/* ---- phone landscape: every vertical pixel counts ---- */
@media (max-width: 860px) and (max-height: 500px) {
  :root { --dock-h: 58px; } /* 12px handle + 46px tab bar */
  .sheet-handle { height: 12px; }
  .tabs { height: 46px; }
  .tab-btn { padding: 6px 2px; font-size: 11px; }
  .topbar .btn { min-height: 36px; padding: 6px 9px; font-size: 15px; }
  .transport { padding: 4px 8px; }
  .timeline { max-height: min(42vh, 160px); }
  .panel { height: min(76vh, 320px); }
}