/* ===== Reset & Base ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg-primary: #f5f5f8;
  --bg-secondary: #eeeef3;
  --bg-elevated: rgba(255, 255, 255, 0.85);
  --surface: rgba(0, 0, 0, 0.03);
  --surface-hover: rgba(0, 0, 0, 0.06);
  --border: rgba(0, 0, 0, 0.09);
  --border-focus: rgba(99, 102, 241, 0.5);
  --text-primary: #1a1a2e;
  --text-secondary: #6b6b85;
  --text-muted: #9999ad;
  --accent: #6366f1;
  --accent-hover: #5558e6;
  --accent-glow: rgba(99, 102, 241, 0.15);
  --selected-bg: rgba(99, 102, 241, 0.1);
  --selected-border: rgba(99, 102, 241, 0.35);
  --warning: #d97706;
  --warning-bg: rgba(217, 119, 6, 0.1);
  --warning-border: rgba(217, 119, 6, 0.2);
  --danger: #dc2626;
  --success: #059669;
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
  --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.12);
}

html { font-size: 14px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  overflow-x: hidden;
  background-image:
    radial-gradient(ellipse at 20% 0%, rgba(99, 102, 241, 0.05) 0%, transparent 60%),
    radial-gradient(ellipse at 80% 100%, rgba(139, 92, 246, 0.04) 0%, transparent 60%);
  user-select: none;
}

.glass {
  background: var(--bg-elevated);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

/* ===== Header ===== */
#app-header { padding: 2rem 2rem 1rem; text-align: center; }
.header-content { max-width: 1200px; margin: 0 auto; }
.logo { display: inline-flex; align-items: center; gap: 0.75rem; }
.logo h1 {
  font-size: 1.75rem; font-weight: 700;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; letter-spacing: -0.02em;
}
.tagline { color: var(--text-secondary); font-size: 0.9rem; margin-top: 0.25rem; }

/* ===== Main ===== */
main { max-width: 1200px; margin: 0 auto; padding: 1rem 2rem 3rem; }

/* ===== Drop Zone ===== */
#drop-zone {
  border: 2px dashed var(--border); border-radius: var(--radius);
  padding: 4rem 2rem; text-align: center;
  transition: var(--transition); cursor: pointer; background: var(--surface);
}
#drop-zone:hover, #drop-zone.drag-over { border-color: var(--accent); background: var(--accent-glow); }
#drop-zone.drag-over { transform: scale(1.01); }
.drop-icon { color: var(--text-muted); margin-bottom: 1rem; transition: var(--transition); }
#drop-zone:hover .drop-icon, #drop-zone.drag-over .drop-icon { color: var(--accent); transform: translateY(-4px); }
.drop-title { font-size: 1.15rem; font-weight: 600; margin-bottom: 0.5rem; }
.drop-hint { color: var(--text-secondary); font-size: 0.85rem; margin-bottom: 1.5rem; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 0.4rem;
  padding: 0.55rem 1.1rem; border: none; border-radius: var(--radius-xs);
  font-family: var(--font); font-size: 0.85rem; font-weight: 500;
  cursor: pointer; transition: var(--transition); white-space: nowrap;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 2px 12px var(--accent-glow); }
.btn-ghost { background: white; color: var(--text-primary); border: 1px solid var(--border); }
.btn-ghost:hover { background: var(--bg-primary); border-color: rgba(0,0,0,0.15); }
.btn-warning { background: var(--warning-bg); color: var(--warning); border: 1px solid var(--warning-border); }
.btn-warning:hover { background: rgba(217,119,6,0.18); }
.btn-sm { padding: 0.35rem 0.7rem; font-size: 0.8rem; }

/* ===== Toolbar ===== */
.toolbar {
  display: flex; align-items: center; justify-content: space-between;
  gap: 1rem; padding: 0.75rem 1.25rem; border-radius: var(--radius);
  margin-bottom: 0.5rem; flex-wrap: wrap;
  position: relative; z-index: 10;
}
.toolbar-left, .toolbar-right { display: flex; align-items: center; gap: 0.5rem; flex-wrap: wrap; }
.sub-count {
  color: var(--text-muted); font-size: 0.8rem; padding: 0 0.5rem;
  border-right: 1px solid var(--border); margin-right: 0.25rem;
}

/* ===== Filename Editor ===== */
.filename-group { display: flex; align-items: center; gap: 0; position: relative; }
.filename-input {
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-xs) 0 0 var(--radius-xs);
  color: var(--text-primary); font-family: var(--font); font-size: 0.85rem;
  padding: 0.35rem 0.6rem; width: 220px; transition: var(--transition);
  border-right: none;
}
.filename-input:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 2px var(--accent-glow); }
.suffix-dropdown { position: relative; }
.suffix-btn {
  border-radius: 0 var(--radius-xs) var(--radius-xs) 0 !important;
  border-left: none !important; height: 100%;
}
.suffix-menu {
  position: absolute; top: 100%; right: 0; margin-top: 4px;
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-xs); overflow: hidden; z-index: 500;
  min-width: 180px; box-shadow: var(--shadow-lg);
  animation: fadeIn 0.15s ease;
}
.suffix-menu button {
  display: block; width: 100%; text-align: left; padding: 0.55rem 1rem;
  background: none; border: none; color: var(--text-primary);
  font-family: var(--font); font-size: 0.85rem; cursor: pointer;
  transition: background 0.1s;
}
.suffix-menu button:hover { background: var(--bg-primary); }

/* ===== Selection Hint ===== */
.selection-hint {
  padding: 0.4rem 1rem; border-radius: var(--radius-xs);
  margin-bottom: 0.5rem; font-size: 0.75rem; color: var(--text-muted);
}

/* ===== Table ===== */
.table-container { border-radius: var(--radius); overflow: hidden; max-height: calc(100vh - 300px); overflow-y: auto; }
.table-container::-webkit-scrollbar { width: 6px; }
.table-container::-webkit-scrollbar-track { background: transparent; }
.table-container::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 3px; }

#subtitle-table { width: 100%; border-collapse: collapse; }
#subtitle-table thead { position: sticky; top: 0; z-index: 2; }
#subtitle-table th {
  padding: 0.75rem 1rem; text-align: left; font-weight: 600;
  font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.05em;
  color: var(--text-secondary); background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
}
#subtitle-table td {
  padding: 0.6rem 1rem; border-bottom: 1px solid var(--border);
  vertical-align: middle; transition: background var(--transition);
}
#subtitle-table tbody tr { transition: background var(--transition); cursor: default; }
#subtitle-table tbody tr:hover { background: var(--surface-hover); }
#subtitle-table tbody tr:last-child td { border-bottom: none; }

/* Selected rows */
#subtitle-table tbody tr.selected { background: var(--selected-bg); }
#subtitle-table tbody tr.selected:hover { background: rgba(99,102,241,0.15); }
#subtitle-table tbody tr.selected td:first-child { box-shadow: inset 3px 0 0 var(--accent); }

.col-index { width: 50px; text-align: center !important; }
.col-time { width: 140px; }

td[contenteditable="true"] { outline: none; cursor: text; border-radius: var(--radius-xs); user-select: text; }
td[contenteditable="true"]:focus { background: rgba(99,102,241,0.08); box-shadow: inset 0 0 0 1px var(--border-focus); }
td.cell-index { text-align: center; color: var(--text-muted); font-size: 0.8rem; font-weight: 600; }
td.cell-time { font-family: 'SF Mono','Fira Code',monospace; font-size: 0.95rem; color: var(--text-primary); letter-spacing: 0.02em; }
td.cell-text { white-space: pre-wrap; word-break: break-word; max-width: 0; user-select: text; }
.empty-state { text-align: center; padding: 3rem 1rem; color: var(--text-muted); }

/* ===== Context Menu ===== */
.context-menu {
  position: fixed; z-index: 1000;
  background: white; border: 1px solid var(--border);
  border-radius: var(--radius-sm); overflow: hidden;
  min-width: 200px; box-shadow: var(--shadow-lg);
  animation: fadeIn 0.12s ease;
}
.context-menu button {
  display: block; width: 100%; text-align: left; padding: 0.6rem 1rem;
  background: none; border: none; color: var(--text-primary);
  font-family: var(--font); font-size: 0.85rem; cursor: pointer;
  transition: background 0.1s;
}
.context-menu button:hover { background: var(--bg-primary); }
.context-menu .ctx-danger { color: var(--danger); }
.context-menu .ctx-danger:hover { background: rgba(220,38,38,0.06); }
.ctx-divider { height: 1px; background: var(--border); margin: 2px 0; }

/* ===== Modal ===== */
.modal-overlay {
  position: fixed; inset: 0; background: rgba(0,0,0,0.25);
  backdrop-filter: blur(4px); display: flex; align-items: center;
  justify-content: center; z-index: 100; animation: fadeIn 0.2s ease;
}
.modal {
  width: 90%; max-width: 480px; border-radius: var(--radius);
  animation: slideUp 0.25s ease; box-shadow: var(--shadow-lg);
  background: white; border: 1px solid var(--border);
}
.modal-header { display: flex; align-items: center; justify-content: space-between; padding: 1.25rem 1.5rem 1rem; }
.modal-header h2 { font-size: 1.1rem; font-weight: 600; }
.modal-close {
  background: none; border: none; color: var(--text-secondary);
  font-size: 1.5rem; cursor: pointer; padding: 0 0.25rem; line-height: 1; transition: var(--transition);
}
.modal-close:hover { color: var(--text-primary); }
.modal-body { padding: 0 1.5rem 1.25rem; }
.modal-footer { display: flex; justify-content: flex-end; gap: 0.5rem; padding: 1rem 1.5rem; border-top: 1px solid var(--border); }

/* ===== Scope Options ===== */
.scope-options { display: flex; flex-wrap: wrap; gap: 0.4rem; }
.scope-option {
  display: flex; align-items: center; gap: 0.4rem;
  padding: 0.4rem 0.8rem; border-radius: var(--radius-xs);
  border: 1px solid var(--border); cursor: pointer; font-size: 0.82rem;
  transition: var(--transition); color: var(--text-secondary);
}
.scope-option:has(input:checked) {
  border-color: var(--accent); background: var(--accent-glow); color: var(--accent);
  font-weight: 600;
}
.scope-option input { display: none; }

/* ===== Forms ===== */
.form-group { margin-bottom: 1.25rem; }
.form-group:last-child { margin-bottom: 0; }
.form-group label { display: block; font-size: 0.85rem; font-weight: 500; margin-bottom: 0.4rem; color: var(--text-secondary); }
.form-group input, .form-group textarea {
  width: 100%; padding: 0.55rem 0.75rem;
  background: var(--bg-primary); border: 1px solid var(--border);
  border-radius: var(--radius-xs); color: var(--text-primary);
  font-family: var(--font); font-size: 0.9rem; transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--border-focus); box-shadow: 0 0 0 3px var(--accent-glow); }
.form-group textarea { resize: vertical; }
.form-hint { font-size: 0.75rem; color: var(--text-muted); margin-top: 0.3rem; }
.form-row { display: flex; gap: 1rem; }
.form-row .form-group { flex: 1; }
.input-row { display: flex; gap: 0.5rem; align-items: center; }
.input-row input { flex: 1; text-align: center; }

/* ===== Toast ===== */
.toast {
  position: fixed; bottom: 2rem; left: 50%; transform: translateX(-50%) translateY(20px);
  padding: 0.65rem 1.5rem; border-radius: var(--radius-sm);
  font-size: 0.85rem; font-weight: 500; z-index: 300; opacity: 0;
  transition: all 0.3s ease; pointer-events: none; background: var(--success); color: #fff;
  box-shadow: var(--shadow-md);
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }
.toast.error { background: var(--danger); }

/* ===== Utilities ===== */
.hidden { display: none !important; }
@keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
@keyframes slideUp { from { opacity: 0; transform: translateY(20px) scale(0.97); } to { opacity: 1; transform: translateY(0) scale(1); } }
#editor { animation: fadeIn 0.3s ease; }

@media (max-width: 768px) {
  main { padding: 1rem; }
  .toolbar { flex-direction: column; align-items: stretch; }
  .toolbar-left, .toolbar-right { justify-content: center; }
  .form-row { flex-direction: column; gap: 0; }
  .col-time { width: 120px; }
  td.cell-time { font-size: 0.75rem; }
  .filename-input { width: 150px; }
}