:root {
  color-scheme: light;
  --bg: #f3f0e8;
  --paper: #fffdf8;
  --ink: #1d1a16;
  --muted: #5e584f;
  --line: #e2d9cc;
  --nav: #1c2430;
  --nav-ink: #f4efe6;
  --nav-dim: #b7c0cc;
  --accent: #9a4e24;
  --accent-ink: #fff8f3;
  --green: #1f6b45;
  --yellow: #8a5a10;
  --red: #9d2f2a;
  --blue: #1e4f86;
  --shadow: 0 10px 30px rgba(48, 36, 22, 0.06);
  --sidebar: 232px;
  --radius: 14px;
  --font: "Segoe UI", "PingFang TC", "Noto Sans CJK TC", "Microsoft JhengHei", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #10141a;
  --paper: #1a212b;
  --ink: #f3efe7;
  --muted: #b4b0a6;
  --line: #2d3642;
  --nav: #0c1016;
  --nav-ink: #f4efe6;
  --nav-dim: #9aa6b5;
  --accent: #e09a62;
  --accent-ink: #24160d;
  --green: #8ddeb3;
  --yellow: #f0c36a;
  --red: #ffb1ab;
  --blue: #9dc2ef;
  --shadow: none;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.45;
}
button, input, select, textarea { font: inherit; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
a { color: var(--blue); }
.skip {
  position: absolute; left: 12px; top: -40px; background: var(--accent); color: var(--accent-ink);
  padding: 8px 12px; z-index: 20;
}
.skip:focus { top: 12px; }

.login-screen {
  min-height: 100vh;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
}
.login-hero {
  background: linear-gradient(160deg, #1c2430 0%, #3d2a22 100%);
  color: #f7f1e8;
  padding: 64px 56px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.login-hero h1 { font-size: 42px; line-height: 1.15; margin: 12px 0; font-weight: 650; }
.login-hero p { max-width: 460px; color: #eadfd2; }
.eyebrow { letter-spacing: 0.14em; text-transform: uppercase; font-size: 12px; color: #e2b08a; margin: 0; }
.login-panel { display: grid; place-items: center; padding: 32px 20px; }
.login-card { width: min(420px, 100%); background: var(--paper); border: 1px solid var(--line); border-radius: 20px; padding: 28px; box-shadow: var(--shadow); }
.login-card h2 { margin: 0 0 8px; }

.shell { min-height: 100vh; display: grid; grid-template-columns: var(--sidebar) 1fr; }
.sidebar {
  background: var(--nav); color: var(--nav-ink); padding: 18px 12px; display: flex; flex-direction: column; gap: 8px;
  position: sticky; top: 0; height: 100vh;
}
.brand { padding: 8px 10px 16px; }
.brand strong { display: block; font-size: 16px; }
.brand span { color: var(--nav-dim); font-size: 12px; }
.nav-link {
  display: flex; align-items: center; gap: 8px; color: var(--nav-dim); text-decoration: none;
  padding: 10px 12px; border-radius: 10px;
}
.nav-link.active, .nav-link:hover { background: rgba(255,255,255,0.06); color: white; }
.sidebar-foot { margin-top: auto; padding: 10px; color: var(--nav-dim); font-size: 12px; }
.workspace { min-width: 0; }
.topbar {
  display: flex; align-items: center; gap: 12px; padding: 14px 22px; border-bottom: 1px solid var(--line);
  background: color-mix(in srgb, var(--paper) 88%, transparent); position: sticky; top: 0; z-index: 5;
}
.topbar h1 { font-size: 20px; margin: 0; flex: 1; }
.icon-btn, .btn, .btn-ghost, .btn-danger {
  border: 1px solid var(--line); background: var(--paper); border-radius: 10px; padding: 8px 12px; cursor: pointer;
}
.btn { background: var(--accent); color: var(--accent-ink); border-color: transparent; }
.btn-danger { background: var(--red); color: white; border-color: transparent; }
.btn-ghost { background: transparent; }
.icon-btn { padding: 8px 10px; }
.menu-btn { display: none; }
main { padding: 20px 22px 48px; }
.filters, .toolbar, .row-actions { display: flex; flex-wrap: wrap; gap: 10px; align-items: end; margin-bottom: 16px; }
.kpi-grid, .chart-grid { display: grid; gap: 12px; }
.kpi-grid { grid-template-columns: repeat(6, minmax(0, 1fr)); margin-bottom: 16px; }
.chart-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.card, .kpi {
  background: var(--paper); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; box-shadow: var(--shadow);
}
.kpi span { display: block; color: var(--muted); font-size: 12px; }
.kpi strong { font-size: 28px; font-variant-numeric: tabular-nums; }
.kpi em { font-style: normal; color: var(--muted); font-size: 12px; }
.card h2, .card h3 { margin: 0 0 10px; font-size: 16px; }
.chart-box { position: relative; height: 260px; }
.table-scroll { overflow-x: auto; }
table.data { width: 100%; border-collapse: collapse; font-size: 14px; }
table.data th, table.data td { text-align: left; padding: 8px 10px; border-bottom: 1px solid var(--line); vertical-align: top; white-space: nowrap; }
table.data th { color: var(--muted); font-weight: 600; font-size: 12px; }
.badge { display: inline-flex; align-items: center; border-radius: 999px; padding: 2px 8px; font-size: 12px; border: 1px solid var(--line); }
.tone-green { color: var(--green); background: color-mix(in srgb, var(--green) 12%, transparent); }
.tone-yellow { color: var(--yellow); background: color-mix(in srgb, var(--yellow) 14%, transparent); }
.tone-red { color: var(--red); background: color-mix(in srgb, var(--red) 12%, transparent); }
.tone-blue { color: var(--blue); background: color-mix(in srgb, var(--blue) 12%, transparent); }
.tone-neutral { color: var(--muted); }
.field { display: flex; flex-direction: column; gap: 4px; font-size: 13px; min-width: 140px; }
.field span { color: var(--muted); }
input, select, textarea {
  background: var(--bg); border: 1px solid var(--line); border-radius: 10px; padding: 8px 10px; width: 100%;
}
textarea { min-height: 90px; resize: vertical; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.form-grid .wide { grid-column: 1 / -1; }
.form-error { color: var(--red); margin: 0; }
.empty, .note { color: var(--muted); }
.tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 14px; }
.tabs button[aria-selected="true"] { background: var(--nav); color: white; border-color: transparent; }
.overlay {
  position: fixed; inset: 0; background: rgba(16, 16, 16, 0.46); display: grid; place-items: center; z-index: 30; padding: 18px;
}
.dialog { width: min(720px, 100%); max-height: min(86vh, 860px); overflow: auto; background: var(--paper); border-radius: 18px; padding: 18px; border: 1px solid var(--line); }
.dialog h2 { margin: 0 0 12px; }
.toast {
  position: fixed; right: 16px; bottom: 16px; background: var(--nav); color: white; padding: 12px 14px; border-radius: 12px; z-index: 40; max-width: 320px;
}
.rules { font-size: 13px; color: var(--muted); }
.rules li { margin: 4px 0; }
.split { display: grid; grid-template-columns: 1.4fr 0.8fr; gap: 12px; }
.kanban { display: grid; grid-template-columns: repeat(6, minmax(180px, 1fr)); gap: 10px; overflow-x: auto; }
.kanban-col { background: color-mix(in srgb, var(--paper) 70%, var(--bg)); border: 1px solid var(--line); border-radius: 12px; padding: 8px; min-height: 180px; }
.kanban-card { background: var(--paper); border: 1px solid var(--line); border-radius: 10px; padding: 8px; margin-bottom: 8px; }
.calendar { display: grid; grid-template-columns: repeat(7, minmax(0, 1fr)); gap: 6px; }
.calendar .day { min-height: 92px; border: 1px solid var(--line); border-radius: 10px; padding: 6px; background: var(--paper); }
.calendar .dow { color: var(--muted); font-size: 12px; text-align: center; }
.cal-item { display: block; font-size: 12px; margin-top: 4px; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }

.gantt { border: 1px solid var(--line); border-radius: 14px; background: var(--paper); overflow: hidden; }
.gantt-scroll { overflow: auto; max-height: 70vh; }
.gantt-row, .gantt-head-row { display: grid; grid-template-columns: 220px 120px 104px 104px 72px 120px 88px minmax(480px, 1fr); }
.gantt-row > div, .gantt-head-row > div { border-bottom: 1px solid var(--line); border-right: 1px solid var(--line); padding: 6px 8px; min-height: 42px; }
.gantt-head-row { position: sticky; top: 0; z-index: 3; background: var(--paper); font-size: 12px; color: var(--muted); }
.gantt-name { position: sticky; left: 0; background: var(--paper); z-index: 2; }
.gantt-project { font-weight: 650; background: color-mix(in srgb, var(--accent) 8%, var(--paper)); }
.timeline { position: relative; padding: 0; min-height: 42px; }
.timeline-inner { position: relative; height: 42px; }
.bar {
  position: absolute; top: 10px; height: 22px; border-radius: 7px; background: var(--blue); color: white;
  font-size: 11px; display: flex; align-items: center; padding: 0 6px; touch-action: none; cursor: grab; min-width: 8px;
}
.bar.overdue { background: var(--red); }
.bar.done { background: var(--green); }
.bar .fill { position: absolute; left: 0; top: 0; bottom: 0; background: rgba(255,255,255,0.28); border-radius: 7px; }
.diamond {
  position: absolute; top: 12px; width: 16px; height: 16px; background: var(--accent); transform: rotate(45deg); cursor: grab; touch-action: none;
}
.gantt-today { position: absolute; top: 0; bottom: 0; width: 2px; background: var(--red); pointer-events: none; z-index: 2; }
.gantt-arrows { position: absolute; inset: 0; pointer-events: none; overflow: visible; }
.legend { display: flex; gap: 12px; flex-wrap: wrap; font-size: 12px; color: var(--muted); margin: 8px 0 12px; }
.user-chip { font-size: 13px; color: var(--muted); }

@media (max-width: 1100px) {
  .kpi-grid { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .chart-grid, .split, .login-screen { grid-template-columns: 1fr; }
  .login-hero { display: none; }
}
@media (max-width: 860px) {
  .shell { grid-template-columns: 1fr; }
  .sidebar { position: fixed; z-index: 15; transform: translateX(-105%); width: min(80vw, 280px); transition: transform 0.2s ease; }
  .sidebar.open { transform: none; }
  .menu-btn { display: inline-flex; }
  .kpi-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .gantt-row, .gantt-head-row { grid-template-columns: 160px minmax(420px, 1fr); }
  .gantt-extra { display: none; }
  main { padding: 14px; }
  .form-grid { grid-template-columns: 1fr; }
  .kanban { grid-template-columns: repeat(6, 220px); }
}
@media print {
  .sidebar, .topbar, .toolbar, .noprint { display: none !important; }
  .shell { display: block; }
  body { background: white; }
}