:root {
  --bg: #1e1e1e;
  --bg-panel: #252526;
  --bg-elevated: #2d2d30;
  --border: #3c3c3c;
  --text: #d4d4d4;
  --text-dim: #9a9a9a;
  --accent: #0e8cff;
  --accent-soft: #1a3a5c;
  --header-bg: #333333;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-size: 12px;
}

body { display: flex; flex-direction: column; }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 16px; background: var(--header-bg);
  border-bottom: 1px solid var(--border); flex: 0 0 auto;
}

.topbar h1 { margin: 0; font-size: 14px; font-weight: 600; }
.accent { color: var(--accent); }

.header-actions { display: flex; align-items: center; gap: 12px; min-width: 0; }

.btn { flex: 0 0 auto; }

.btn {
  background: var(--accent); color: #fff; border: 1px solid var(--accent);
  padding: 6px 16px;
  border-radius: 4px; cursor: pointer; font-size: 13px;
}
.btn:hover { filter: brightness(1.1); }

.btn-secondary {
  background: var(--bg-elevated);
  color: var(--text);
  border: 1px solid var(--border);
}

.header-actions .file-name,
.header-actions .version-badge,
.header-actions .btn {
  border-radius: 999px;
  line-height: 1;
}
.header-actions .btn { padding-top: 7px; padding-bottom: 7px; }

.file-name {
  color: var(--text-dim); font-size: 12px;
  background: var(--bg-elevated); border: 1px solid var(--border);
  padding: 5px 12px; line-height: 1.4;
}

.version-badge {
  padding: 5px 12px; border-radius: 999px; font-size: 12px; font-weight: 500;
  background: var(--bg-elevated); color: var(--text-dim); border: 1px solid var(--border);
}

.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,.55); display: flex;
  align-items: center; justify-content: center; z-index: 10000;
}
.modal {
  background: var(--bg-panel); border: 1px solid var(--border); border-radius: 8px;
  width: min(640px, calc(100vw - 48px)); max-height: 80vh; overflow: auto;
  box-shadow: 0 8px 32px rgba(0,0,0,.5);
}
.modal-head {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 1px solid var(--border); font-weight: 600;
}
.modal-body { padding: 14px 20px 18px; font-size: 13px; color: var(--text); line-height: 1.6; }
.modal-body h4 { margin: 12px 0 6px; color: var(--accent); font-size: 13px; text-transform: uppercase; letter-spacing: .5px; }
.modal-body ul { margin: 0 0 8px; padding-left: 18px; }
.modal-body li { margin: 3px 0; }
.modal-body a { color: #7ec8ff; }

.codec-badge {
  padding: 5px 14px; border-radius: 999px; font-size: 12px; font-weight: 600;
  background: var(--accent-soft); color: #7ec8ff; border: 1px solid var(--accent);
}

.dropzone {
  flex: 1; display: flex; align-items: center; justify-content: center;
  margin: 16px; border: 2px dashed var(--border); border-radius: 8px;
  background: var(--bg-panel); text-align: center; cursor: pointer; transition: all 0.15s;
}
.dropzone.dragover { border-color: var(--accent); background: var(--accent-soft); }
.dropzone-inner p { margin: 8px 0; color: var(--text-dim); }
.dropzone-inner .hint { font-size: 12px; }
.dropzone-inner code { background: var(--bg-elevated); padding: 2px 6px; border-radius: 3px; color: #e0e0e0; }

.stats-bar {
  display: flex; flex-wrap: wrap; gap: 8px 24px; padding: 10px 16px;
  background: var(--bg-panel); border-bottom: 1px solid var(--border); flex: 0 0 auto;
}
.stat { display: flex; gap: 6px; }
.stat .label { color: var(--text-dim); }
.stat .value { font-weight: 600; color: #fff; }

.timeline-panel { flex: 0 0 auto; border-bottom: 1px solid var(--border); background: var(--bg-panel); }
.timeline-wrap { padding: 6px 12px 10px; overflow-x: auto; }
.timeline { display: block; cursor: crosshair; }
.timeline-tip { position: fixed; pointer-events: none; background: rgba(0,0,0,.85); color: #eee; font: 11px monospace; padding: 3px 6px; border-radius: 3px; z-index: 9999; white-space: pre; }
.preview-view { padding: 4px 0 18px; overflow: hidden; }
.preview-wrap { padding: 10px 16px 22px; display: flex; align-items: flex-start; justify-content: center; gap: 16px; min-height: 140px; }
.preview-canvas { display: block; background: #000; border: 1px solid var(--border); border-radius: 6px; max-width: calc(100% - 230px); max-height: 480px; width: auto; height: auto; box-shadow: 0 2px 8px rgba(0,0,0,.3); }
.preview-side { display: flex; flex-direction: column; gap: 8px; min-width: 150px; max-width: 220px; padding-top: 4px; flex: 0 0 auto; }
.preview-controls { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; }
.btn-small { padding: 4px 10px; font-size: 12px; }
.preview-msg { color: var(--text-dim); font-size: 12px; line-height: 1.5; word-break: break-all; }
.legend { font-weight: 400; font-size: 12px; color: var(--text-dim); margin-left: 8px; }
.legend b { font-weight: 600; }
.zoom-btn { margin-left: 4px; padding: 0 8px; font: 12px monospace; line-height: 18px; cursor: pointer; background: var(--bg-panel); color: var(--text); border: 1px solid var(--border); border-radius: 3px; }
.zoom-btn:hover { background: var(--border); }

.main-area {
  flex: 1 1 auto; display: grid; grid-template-columns: minmax(340px, 44%) 5px 1fr;
  gap: 0; min-height: 0;
}

.panel { display: flex; flex-direction: column; min-height: 0; min-width: 0; }
.nal-panel { border-right: 1px solid var(--border); }
.syntax-panel { border-left: 1px solid var(--border); }

.panel-title {
  padding: 8px 12px; background: var(--bg-elevated);
  border-bottom: 1px solid var(--border); font-weight: 600;
  display: flex; align-items: center; gap: 8px; flex: 0 0 auto;
}
.count { color: var(--text-dim); font-weight: 400; font-size: 12px; }

.tab-group { margin-left: auto; display: flex; gap: 2px; }
.tab {
  background: var(--bg); color: var(--text); border: 1px solid var(--border);
  padding: 4px 12px; cursor: pointer; font-size: 12px; border-radius: 4px;
}
.tab.active { background: var(--accent); color: #fff; border-color: var(--accent); }

/* 虚拟滚动 NAL 列表 */
.nal-panel { position: relative; }
.nal-header {
  display: flex; padding: 6px 12px; background: var(--bg-elevated);
  border-bottom: 1px solid var(--border); color: var(--text-dim);
  font-weight: 600; flex: 0 0 auto; font-size: 12px;
}
.nal-scroll { flex: 1; overflow-y: auto; position: relative; min-height: 0; }
#nalSpacer { width: 1px; }
#nalRows { position: absolute; top: 0; left: 0; right: 0; }

.nal-row {
  display: flex; align-items: center; height: 22px; padding: 0 12px;
  border-bottom: 1px solid #2a2a2a; cursor: pointer; white-space: nowrap; font-size: 12px;
}
.nal-row:hover { background: #2a2d2e; }
.nal-row.selected { background: var(--accent-soft); }

.c-offset { flex: 0 0 96px; font-family: "SF Mono", Menlo, Consolas, monospace; }
.c-length { flex: 0 0 84px; font-family: "SF Mono", Menlo, Consolas, monospace; text-align: right; padding-right: 18px; }
.c-type { flex: 0 0 150px; font-family: "SF Mono", Menlo, Consolas, monospace; }
.c-frame { flex: 0 0 64px; font-family: "SF Mono", Menlo, Consolas, monospace; text-align: right; padding-right: 18px; color: #7ec8ff; }
.c-info { flex: 1 1 auto; overflow: hidden; text-overflow: ellipsis; }

.nal-header .c-offset, .nal-header .c-length, .nal-header .c-type, .nal-header .c-frame, .nal-header .c-info { color: var(--text-dim); }

.bottom-panels {
  flex: 0 0 200px; display: grid; grid-template-columns: 320px 5px 1fr;
  border-top: 1px solid var(--border); min-height: 0;
}
.hdr-panel { border-right: 1px solid var(--border); }

.table-wrap { flex: 1; overflow: auto; min-height: 0; }
table { border-collapse: collapse; width: 100%; font-size: 12px; }
thead th {
  position: sticky; top: 0; background: var(--bg-elevated); text-align: left;
  padding: 6px 10px; border-bottom: 1px solid var(--border); color: var(--text-dim);
  font-weight: 600; z-index: 1;
}
tbody td { padding: 3px 10px; border-bottom: 1px solid #2a2a2a; white-space: nowrap; }
td.mono { font-family: "SF Mono", Menlo, Consolas, monospace; }

.kv-list { padding: 8px 12px; overflow: auto; line-height: 1.7; }
.kv-row { display: flex; gap: 8px; }
.kv-row .k { color: var(--text-dim); min-width: 180px; }
.kv-row .v { color: #e0e0e0; }

.filter {
  margin-left: auto; background: var(--bg-elevated); color: var(--text);
  border: 1px solid var(--border); border-radius: 4px; padding: 3px 6px; font-size: 12px;
}

.syntax-tree {
  flex: 1; overflow: auto; padding: 8px 12px;
  font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 12px; line-height: 1.55;
}
.tree-node { margin-left: 0; }
.tree-children { margin-left: 16px; border-left: 1px dotted #3a3a3a; padding-left: 8px; }
.tree-row { display: flex; align-items: baseline; gap: 4px; cursor: default; }
.tree-row .toggle { display: inline-block; width: 12px; color: var(--text-dim); cursor: pointer; user-select: none; flex: 0 0 auto; }
.tree-row .label { color: var(--text); }
.tree-row .label.group { color: #7ec8ff; font-weight: 600; }

.hex-view {
  flex: 1; overflow: auto; padding: 8px 12px;
  font-family: "SF Mono", Menlo, Consolas, monospace; font-size: 12px; line-height: 1.5;
  white-space: pre;
}
.hex-offset { color: var(--text-dim); }
.hex-byte { color: #e0e0e0; }
.hex-ascii { color: #7ec8ff; }

.bitrate-view { flex: 1; overflow: auto; padding: 8px 12px; }
.bitrate-stats { display: flex; flex-wrap: wrap; gap: 12px; margin-bottom: 8px; font-size: 12px; color: var(--text-dim); }
.bitrate-stats b { color: var(--text); font-weight: 600; }
.bitrate-chart { display: block; width: 100%; }

.statusbar {
  flex: 0 0 auto; padding: 4px 16px; background: var(--header-bg);
  border-top: 1px solid var(--border); color: var(--text-dim); font-size: 12px;
}

.splitter { flex: 0 0 5px; background: var(--border); }
.splitter:hover { background: var(--accent); }
.splitter.dragging { background: var(--accent); }
.splitter-col { cursor: col-resize; align-self: stretch; }
.splitter-row { cursor: row-resize; }

.hidden { display: none !important; }

/* 移动端导航栏：桌面端默认隐藏，移动端显示 */
.mobile-nav { display: none; }

/* ---------- 移动端适配（≤768px） ---------- */
@media (max-width: 768px) {
  html, body { height: 100%; }

  .topbar { flex-wrap: wrap; gap: 6px; padding: 8px 10px; }
  .topbar h1 { font-size: 15px; }
  .header-actions { flex-wrap: wrap; gap: 6px; width: 100%; }
  .header-actions .btn { padding: 6px 12px; font-size: 13px; }
  .header-actions .file-name { max-width: 60vw; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }

  /* 三栏 → 上下堆叠，通过底部导航切换视图 */
  .main-area {
    display: block;
    flex: 1 1 auto;
    min-height: 0;
    overflow: hidden;
  }
  .nal-panel, .syntax-panel { border: none; }
  .nal-panel { display: flex; flex-direction: column; height: 100%; }
  .syntax-panel { display: flex; flex-direction: column; height: 100%; }

  .bottom-panels { display: none; }

  /* 默认视图：NAL */
  body[data-mobile-view="nal"] .nal-panel { display: flex; }
  body[data-mobile-view="nal"] .syntax-panel { display: none; }
  body[data-mobile-view="nal"] .bottom-panels { display: none; }

  body[data-mobile-view="syntax"] .nal-panel { display: none; }
  body[data-mobile-view="syntax"] .syntax-panel { display: flex; }
  body[data-mobile-view="syntax"] .bottom-panels { display: none; }

  body[data-mobile-view="hdr"] .nal-panel { display: none; }
  body[data-mobile-view="hdr"] .syntax-panel { display: none; }
  body[data-mobile-view="hdr"] .bottom-panels { display: block; flex: 1 1 auto; }

  .splitter { display: none; }

  body[data-mobile-view="hdr"] .bottom-panels {
    max-height: none;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
  }
  body[data-mobile-view="hdr"] .hdr-panel,
  body[data-mobile-view="hdr"] .warning-panel { border: none; display: flex; flex-direction: column; }

  /* 时间轴横向滚动占满 */
  .timeline-panel .timeline-wrap { padding: 4px 6px 8px; }

  /* 预览画面移动端全宽 */
  .preview-view { flex: 1 1 auto; min-height: 0; overflow: auto; }
  .preview-wrap { flex-direction: column; padding: 8px 10px 16px; }
  .preview-side { order: -1; max-width: 100%; min-width: 0; width: 100%; }
  .preview-canvas { max-width: 100%; max-height: 40vh; }

  /* NAL 列表列宽收紧 */
  .c-offset { flex: 0 0 72px; }
  .c-length { flex: 0 0 56px; padding-right: 8px; }
  .c-type { flex: 0 0 96px; }
  .c-frame { flex: 0 0 40px; padding-right: 8px; }

  /* 底部移动端导航栏 */
  .mobile-nav {
    display: flex;
    flex: 0 0 auto;
    border-top: 1px solid var(--border);
    background: var(--header-bg);
  }
  .mobile-nav button {
    flex: 1 1 0;
    background: transparent;
    color: var(--text-dim);
    border: none;
    border-right: 1px solid var(--border);
    padding: 10px 4px;
    font-size: 13px;
    cursor: pointer;
  }
  .mobile-nav button:last-child { border-right: none; }
  .mobile-nav button.active { color: #fff; background: var(--accent-soft); }
}