@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700;800&family=Noto+Sans+TC:wght@400;500;700&display=swap');

/* ─── Theme variables ─────────────────────────────────────────────── */

body[data-theme="day"] {
  --bg-base: #eef2ff;
  --bg-pattern-dot: rgba(99, 102, 241, 0.09);
  --sidebar-bg: #ffffff;
  --sidebar-border: rgba(226, 232, 240, 0.9);
  --panel: #ffffff;
  --panel-soft: #f8fafc;
  --panel-border: rgba(226, 232, 240, 0.8);
  --text: #0f172a;
  --muted: #64748b;
  --line: #e2e8f0;
  --accent: #4f46e5;
  --accent-hover: #4338ca;
  --accent-soft: #e0e7ff;
  --accent-glow: rgba(79, 70, 229, 0.18);
  --warn: #d97706;
  --warn-bg: #fef3c7;
  --bad: #ef4444;
  --chip: #f1f5f9;
  --chip-text: #334155;
  --preview-bg: #0f172a;
  --preview-text: #f8fafc;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.07), 0 1px 2px -1px rgb(0 0 0 / 0.07);
  --shadow-md: 0 4px 12px -2px rgb(0 0 0 / 0.1), 0 2px 6px -2px rgb(0 0 0 / 0.06);
  --shadow-lg: 0 10px 24px -4px rgb(0 0 0 / 0.12), 0 4px 8px -4px rgb(0 0 0 / 0.08);
  --shadow-tab: 2px 0 12px -2px rgb(0 0 0 / 0.12);
  --border-radius: 14px;
  --gradient-accent: linear-gradient(135deg, #4f46e5 0%, #7c3aed 55%, #a855f7 100%);
  --mode-individual-bg: #ecfdf5;
  --mode-individual-border: #10b981;
  --mode-individual-text: #047857;
  --mode-group-bg: #fff7ed;
  --mode-group-border: #f97316;
  --mode-group-text: #c2410c;
  color-scheme: light;
}

body[data-theme="night"] {
  --bg-base: #020617;
  --bg-pattern-dot: rgba(99, 102, 241, 0.07);
  --sidebar-bg: #0b1120;
  --sidebar-border: rgba(51, 65, 85, 0.9);
  --panel: #1a2235;
  --panel-soft: #111827;
  --panel-border: rgba(51, 65, 85, 0.7);
  --text: #f1f5f9;
  --muted: #94a3b8;
  --line: #1e2d45;
  --accent: #6366f1;
  --accent-hover: #4f46e5;
  --accent-soft: #1e1b4b;
  --accent-glow: rgba(99, 102, 241, 0.22);
  --warn: #f59e0b;
  --warn-bg: #1c1003;
  --bad: #f87171;
  --chip: #1e2d45;
  --chip-text: #cbd5e1;
  --preview-bg: #020617;
  --preview-text: #f8fafc;
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.4), 0 1px 2px -1px rgb(0 0 0 / 0.3);
  --shadow-md: 0 4px 12px -2px rgb(0 0 0 / 0.5), 0 2px 6px -2px rgb(0 0 0 / 0.4);
  --shadow-lg: 0 10px 24px -4px rgb(0 0 0 / 0.6), 0 4px 8px -4px rgb(0 0 0 / 0.4);
  --shadow-tab: 2px 0 16px -2px rgb(0 0 0 / 0.6);
  --border-radius: 14px;
  --gradient-accent: linear-gradient(135deg, #6366f1 0%, #8b5cf6 55%, #a855f7 100%);
  --mode-individual-bg: #052e1b;
  --mode-individual-border: #10b981;
  --mode-individual-text: #6ee7b7;
  --mode-group-bg: #3c1407;
  --mode-group-border: #f97316;
  --mode-group-text: #fdba74;
  color-scheme: dark;
}

/* ─── Base reset ──────────────────────────────────────────────────── */

* { box-sizing: border-box; }

body {
  margin: 0;
  background-color: var(--bg-base);
  background-image: radial-gradient(circle, var(--bg-pattern-dot) 1px, transparent 1px);
  background-size: 22px 22px;
  color: var(--text);
  font-family: 'Inter', 'Noto Sans TC', sans-serif;
  line-height: 1.6;
  overflow: hidden;
}

/* ─── Scrollbar ───────────────────────────────────────────────────── */

::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb {
  background: var(--line);
  border-radius: 10px;
  border: 1px solid transparent;
  background-clip: padding-box;
}
::-webkit-scrollbar-thumb:hover { background-color: var(--muted); }

/* ─── App shell (flex row) ────────────────────────────────────────── */

.app-shell {
  display: flex;
  flex-direction: row;
  height: 100vh;
  overflow: hidden;
}

/* ─── Sidebar ─────────────────────────────────────────────────────── */

.sidebar {
  flex-shrink: 0;
  width: 340px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--sidebar-border);
  padding: 24px 24px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
  overflow-x: hidden;
  box-shadow: var(--shadow-md);
  z-index: 10;
  transition: width 0.32s cubic-bezier(0.4, 0, 0.2, 1),
              padding 0.32s cubic-bezier(0.4, 0, 0.2, 1),
              opacity 0.24s ease;
}

.sidebar.is-collapsed {
  width: 0;
  padding-left: 0;
  padding-right: 0;
  opacity: 0;
  pointer-events: none;
}

/* ─── Sidebar rail (zero-width seam between sidebar and workspace) ── */

.sidebar-rail {
  flex-shrink: 0;
  width: 0;
  position: relative;
  z-index: 25;
  /* overflow visible so absolutely-positioned children extend into workspace */
}

/* ─── Sidebar toggle button (lives in the rail) ───────────────────── */

.sidebar-toggle {
  position: absolute;
  top: 20px;
  left: 0;
  width: 26px;
  height: 52px;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--sidebar-border);
  border-left: none;
  border-radius: 0 999px 999px 0;
  background: var(--sidebar-bg);
  color: var(--muted);
  cursor: pointer;
  box-shadow: var(--shadow-tab);
  transition: width 0.2s ease, background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
  pointer-events: auto;
  /* ensure it's above workspace content */
  z-index: 1;
}

.sidebar-toggle:hover {
  width: 34px;
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow), var(--shadow-tab);
}

.sidebar-toggle:active { width: 28px; }

.sidebar-toggle-icon {
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  display: block;
  transition: transform 0.32s cubic-bezier(0.4, 0, 0.2, 1);
  /* ‹ when open → › when sidebar collapsed (via sibling selector below) */
}

/* When sidebar is collapsed, flip the arrow to point right */
.sidebar.is-collapsed ~ .sidebar-rail .sidebar-toggle-icon {
  transform: scaleX(-1);
}

/* ─── Section tabs (lives in the rail, centered vertically) ──────── */

.section-tabs {
  position: absolute;
  top: 25%;
  transform: translateY(-50%);
  left: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
  pointer-events: none;
}

.section-tab {
  /* flat on left (sidebar-side), round pill on right (workspace-side) */
  border-radius: 0 999px 999px 0;
  border: 1px solid var(--panel-border);
  border-left: none;
  background: var(--panel);
  color: var(--muted);
  box-shadow: var(--shadow-tab);
  width: 44px;
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: flex-start;
  gap: 9px;
  padding: 10px 13px 10px 11px;
  overflow: hidden;
  white-space: nowrap;
  pointer-events: auto;
  cursor: pointer;
  font-size: 13px;
  font-weight: 600;
  /* width transition fixes the "label cut-off" display issue */
  transition: width 0.26s cubic-bezier(0.4, 0, 0.2, 1),
              border-color 0.2s ease,
              color 0.2s ease,
              background 0.2s ease,
              box-shadow 0.2s ease,
              transform 0.2s ease;
}

button.section-tab:hover:not(:disabled),
.section-tab:focus-visible {
  width: 148px;
  border-color: var(--accent);
  color: var(--accent);
  background: var(--panel);
  box-shadow: 0 0 0 2px var(--accent-glow), var(--shadow-tab);
  transform: translateX(2px);
}

button.section-tab:active:not(:disabled) {
  transform: translateX(1px);
}

.section-tab-icon {
  width: 18px;
  min-width: 18px;
  text-align: center;
  font-weight: 800;
  font-size: 14px;
  line-height: 1;
}

.section-tab-label {
  opacity: 0;
  transform: translateX(-6px);
  /* delay so the label appears after the width has largely expanded */
  transition: opacity 0.15s ease 0.14s, transform 0.15s ease 0.14s;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2px;
}

button.section-tab:hover:not(:disabled) .section-tab-label,
.section-tab:focus-visible .section-tab-label {
  opacity: 1;
  transform: translateX(0);
}

/* ─── Workspace ───────────────────────────────────────────────────── */

.workspace {
  flex: 1;
  min-width: 0;
  padding: 32px 40px;
  overflow-y: auto;
  height: 100vh;
  scroll-behavior: smooth;
  scroll-padding-top: 24px;
}

/* ─── Brand ───────────────────────────────────────────────────────── */

.brand h1 {
  font-size: 25px;
  font-weight: 800;
  margin: 0 0 5px;
  background: var(--gradient-accent);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  letter-spacing: -0.5px;
  line-height: 1.2;
}
.brand p { margin: 0; color: var(--muted); font-size: 12.5px; font-weight: 500; }

/* ─── Drop zone ───────────────────────────────────────────────────── */

.drop-zone {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border: 2px dashed var(--accent);
  border-radius: var(--border-radius);
  background: var(--accent-soft);
  padding: 22px 18px;
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}
.drop-zone::before {
  content: '';
  position: absolute;
  inset: 0;
  background: var(--gradient-accent);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 0;
}
.drop-zone:hover::before, .drop-zone.is-dragging::before { opacity: 1; }
.drop-zone:hover, .drop-zone.is-dragging {
  border-color: var(--accent-hover);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-glow);
}
.drop-zone input { position: absolute; width: 1px; height: 1px; opacity: 0; }
.drop-zone svg { margin-bottom: 10px; position: relative; z-index: 1; color: var(--accent); transition: color 0.3s; }
.drop-title { display: block; font-weight: 700; font-size: 15px; margin-bottom: 5px; position: relative; z-index: 1; color: var(--accent); transition: color 0.3s; }
.drop-hint { font-size: 12px; color: var(--muted); position: relative; z-index: 1; transition: color 0.3s; }
.drop-zone:hover .drop-title, .drop-zone.is-dragging .drop-title,
.drop-zone:hover .drop-hint, .drop-zone.is-dragging .drop-hint,
.drop-zone:hover svg, .drop-zone.is-dragging svg { color: #fff; }

/* ─── Status ──────────────────────────────────────────────────────── */

.status {
  min-height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: 10px;
  color: var(--text);
  font-size: 13px;
  font-weight: 500;
  background: var(--panel-soft);
  text-align: center;
}
.status.is-error { color: var(--bad); background: rgba(239, 68, 68, 0.07); border-color: rgba(239, 68, 68, 0.3); }

/* ─── Buttons ─────────────────────────────────────────────────────── */

button, input, select { font-family: inherit; }
button {
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
  padding: 9px 15px;
  font-size: 12.5px;
  font-weight: 600;
  transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}
button:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
  box-shadow: var(--shadow-sm), 0 0 0 2px var(--accent-glow);
}
button:active:not(:disabled) { transform: translateY(0); box-shadow: none; }
button:disabled { cursor: not-allowed; opacity: 0.45; }

.primary {
  background: var(--gradient-accent);
  border-color: transparent;
  color: #fff;
  box-shadow: var(--shadow-sm), 0 0 0 0 var(--accent-glow);
}
.primary:hover:not(:disabled) {
  color: #fff;
  box-shadow: var(--shadow-md), 0 0 0 3px var(--accent-glow);
  transform: translateY(-2px);
}

.button-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.full { width: 100%; }

/* ─── Sidebar unit list ───────────────────────────────────────────── */

.side-section { flex-grow: 1; display: flex; flex-direction: column; overflow: hidden; }
.side-section h2 {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.8px;
  color: var(--muted);
  font-weight: 700;
  margin: 0 0 10px;
}
.unit-list { display: flex; flex-direction: column; gap: 5px; overflow-y: auto; padding-right: 4px; margin-right: -4px; }
.unit-button {
  text-align: left;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 13px;
  border-radius: 9px;
  border: 1px solid transparent;
  background: transparent;
  transition: all 0.2s;
}
.unit-button:hover:not(.is-active) { background: var(--panel-soft); border-color: var(--line); }
.unit-button.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: inset 3px 0 0 var(--accent);
  border-radius: 4px 9px 9px 4px;
  padding-left: 10px;
}
.unit-name { font-weight: 600; font-size: 13.5px; line-height: 1.3; }
.unit-meta { color: var(--muted); font-size: 11.5px; }

/* ─── Topbar ──────────────────────────────────────────────────────── */

.topbar { display: flex; align-items: flex-end; justify-content: space-between; gap: 24px; margin-bottom: 28px; }
.topbar h2 { margin: 0 0 7px; font-size: 30px; font-weight: 800; letter-spacing: -0.5px; line-height: 1.1; }
.topbar p { margin: 0; color: var(--muted); font-size: 14px; }
.search {
  width: min(340px, 100%);
  border: 1px solid var(--line);
  border-radius: 9px;
  padding: 11px 16px;
  font-size: 13.5px;
  background: var(--panel);
  color: var(--text);
  box-shadow: var(--shadow-sm);
  transition: all 0.2s;
}
.search:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

/* ─── Panels ──────────────────────────────────────────────────────── */

.panel {
  border: 1px solid var(--panel-border);
  border-radius: var(--border-radius);
  background: var(--panel);
  margin-bottom: 22px;
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  scroll-margin-top: 24px;
  position: relative;
}

/* Accent top-edge line on each panel */
.panel::before {
  content: '';
  display: block;
  height: 3px;
  background: var(--gradient-accent);
  opacity: 0.6;
  flex-shrink: 0;
}

.panel-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  border-bottom: 1px solid var(--line);
  background: var(--panel-soft);
}
.panel-head h3 { margin: 0; font-size: 15px; font-weight: 700; color: var(--text); }
.panel-title { display: flex; align-items: center; gap: 11px; min-width: 0; }
.panel-actions { display: flex; align-items: center; justify-content: flex-end; gap: 9px; min-width: 0; }
.panel-toggle { padding: 6px 12px; font-size: 11.5px; white-space: nowrap; }
.panel-body {
  max-height: 9999px;
  opacity: 1;
  visibility: visible;
  overflow: hidden;
  transition: max-height 0.28s ease, opacity 0.22s ease, visibility 0.22s ease;
}
.panel.is-collapsed .panel-head { border-bottom: none; }
.panel.is-collapsed .panel-body {
  max-height: 0;
  opacity: 0;
  visibility: hidden;
}

/* Badge */
.badge {
  border-radius: 999px;
  background: var(--gradient-accent);
  color: #fff;
  padding: 3px 10px;
  font-size: 11px;
  font-weight: 700;
  box-shadow: var(--shadow-sm);
  letter-spacing: 0.3px;
}

/* ─── Table ───────────────────────────────────────────────────────── */

.table-wrap { overflow-x: auto; max-height: 65vh; }
table { width: 100%; border-collapse: separate; border-spacing: 0; text-align: left; font-size: 13.5px; }
th, td { padding: 14px 20px; border-bottom: 1px solid var(--line); vertical-align: top; }
th {
  background: var(--panel-soft);
  color: var(--muted);
  font-weight: 600;
  font-size: 11.5px;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  position: sticky;
  top: 0;
  z-index: 1;
  white-space: nowrap;
}
th::after { content: ''; position: absolute; left: 0; bottom: 0; width: 100%; border-bottom: 1px solid var(--line); }
tbody tr { transition: background 0.13s ease; }
tbody tr:hover { background: var(--accent-soft); }
tbody tr:last-child td { border-bottom: none; }
tbody tr.is-collapsed { display: none; }

.empty { color: var(--muted); text-align: center; padding: 44px; font-size: 14px; }

/* ─── Chips ───────────────────────────────────────────────────────── */

.chips { display: flex; flex-wrap: wrap; gap: 5px; }
.chip {
  border-radius: 6px;
  background: var(--chip);
  color: var(--chip-text);
  padding: 3px 8px;
  font-size: 11.5px;
  font-weight: 600;
  border: 1px solid var(--line);
}
.muted { color: var(--muted); }

/* ─── View mode button ────────────────────────────────────────────── */

.mode-button.is-individual {
  border-color: var(--mode-individual-border);
  background: var(--mode-individual-bg);
  color: var(--mode-individual-text);
  font-weight: 700;
}
.mode-button.is-group {
  border-color: var(--mode-group-border);
  background: var(--mode-group-bg);
  color: var(--mode-group-text);
  font-weight: 700;
}

/* ─── Preview panel ───────────────────────────────────────────────── */

.panel-note { color: var(--muted); font-size: 12.5px; }
.preview-head { padding: 11px 22px; }
.preview-select {
  width: min(300px, 100%);
  border: 1px solid var(--line);
  border-radius: 9px;
  background: var(--panel);
  color: var(--text);
  padding: 9px 13px;
  font-size: 13px;
  font-weight: 500;
}
pre {
  margin: 0;
  max-height: 60vh;
  overflow: auto;
  background: var(--preview-bg);
  color: var(--preview-text);
  padding: 22px;
  font-size: 13.5px;
  font-family: 'Consolas', 'Courier New', monospace;
  white-space: pre-wrap;
  line-height: 1.65;
}

/* ─── Warnings ────────────────────────────────────────────────────── */

.warning-list { display: flex; flex-direction: column; gap: 10px; padding: 20px; }
.warning {
  border-left: 4px solid var(--warn);
  border-radius: 0 10px 10px 0;
  background: var(--warn-bg);
  padding: 14px;
  font-size: 13.5px;
  color: var(--text);
}
.warning code {
  display: block;
  margin-top: 7px;
  color: var(--warn);
  font-family: 'Consolas', monospace;
  background: rgba(0,0,0,0.05);
  padding: 9px;
  border-radius: 6px;
  white-space: pre-wrap;
  font-size: 12.5px;
}

/* ─── Utilities ───────────────────────────────────────────────────── */

.is-hidden { display: none !important; }

/* ─── Responsive: medium (1024px) ────────────────────────────────── */

@media (max-width: 1024px) {
  .sidebar { width: 284px; }
  .workspace { padding: 24px 28px; }
}

/* ─── Responsive: mobile (768px) ─────────────────────────────────── */

@media (max-width: 768px) {
  body { overflow: auto; }
  .app-shell { flex-direction: column; height: auto; overflow: visible; }

  /* Sidebar full-width on mobile, no collapse */
  .sidebar {
    width: 100% !important;
    padding: 18px 18px 18px 18px;
    border-right: none;
    border-bottom: 1px solid var(--sidebar-border);
    overflow: visible;
    transition: none;
    opacity: 1 !important;
    pointer-events: auto !important;
  }

  /* Rail becomes a horizontal sticky tab bar on mobile */
  .sidebar-rail {
    width: 100%;
    position: sticky;
    top: 0;
    z-index: 30;
    background: var(--bg-base);
    border-bottom: 1px solid var(--line);
    padding: 7px 16px;
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 6px;
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
  }

  /* Hide desktop toggle on mobile */
  .sidebar-toggle {
    position: static;
    width: 38px;
    height: 38px;
    min-width: 38px;
    border: 1px solid var(--line);
    border-left: 1px solid var(--line);
    border-radius: 999px;
    box-shadow: var(--shadow-sm);
    transform: none !important;
    flex-shrink: 0;
  }
  .sidebar-toggle:hover { width: 38px; }
  .sidebar-toggle-icon { transform: rotate(90deg) !important; }

  /* Section tabs horizontal row on mobile */
  .section-tabs {
    position: static;
    transform: none;
    flex-direction: row;
    flex-wrap: nowrap;
    gap: 5px;
    overflow-x: auto;
    flex: 1;
    pointer-events: auto;
  }

  .section-tab,
  button.section-tab:hover:not(:disabled),
  .section-tab:focus-visible {
    width: auto;
    min-width: 38px;
    height: 38px;
    min-height: 38px;
    border-radius: 999px;
    border: 1px solid var(--line);
    border-left: 1px solid var(--line);
    transform: none;
    box-shadow: var(--shadow-sm);
    padding: 8px 12px;
    flex-shrink: 0;
    transition: none;
  }

  .section-tab-label {
    opacity: 1;
    transform: none;
    transition: none;
    font-size: 11px;
  }

  .workspace { padding: 18px; height: auto; }
  .topbar { flex-direction: column; align-items: flex-start; gap: 10px; margin-bottom: 18px; }
  .topbar h2 { font-size: 22px; }
  .search { width: 100%; }
  .button-grid { grid-template-columns: 1fr; }
  .panel-head,
  .preview-head,
  .panel-actions { align-items: stretch; flex-direction: column; }
  .panel-title { justify-content: space-between; width: 100%; }
  .preview-select { width: 100%; }
}