:root {
  --paper: #f7f8f6;
  --surface: #ffffff;
  --ink: #13181a;
  --muted: #5c6663;
  --line: #e0e5e0;
  --accent: #0e7357;
  --accent-ink: #0b5a45;
  --accent-soft: #e8f2ee;
  --danger: #b3312a;
  --radius: 8px;
  --font: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Microsoft YaHei", "Hiragino Sans GB", sans-serif;
  --mono: ui-monospace, SFMono-Regular, "Cascadia Code", Consolas, monospace;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--paper);
  color: var(--ink);
  font: 15px/1.6 var(--font);
}

button, input, select, textarea { font: inherit; color: inherit; }

a { color: var(--accent); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.muted { color: var(--muted); }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 15px;
}
.brand span { white-space: nowrap; }

.brand-mark {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  border-radius: 6px;
  background: var(--ink);
  color: #fff;
  font-size: 12px;
  font-weight: 700;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  cursor: pointer;
  transition: background 0.16s ease, border-color 0.16s ease;
}
.btn-primary { background: var(--ink); color: #fff; }
.btn-primary:hover { background: #000; }
.btn-ghost { background: #fff; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: #c3cfc9; }
.btn-danger { background: #fff; border-color: #f0d3d1; color: var(--danger); }
.btn-danger:hover { background: #fdf1f0; }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-block { width: 100%; }

.icon-btn {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font-size: 16px;
  line-height: 1;
  cursor: pointer;
}
.icon-btn:hover { border-color: #c3cfc9; background: #fbfcfb; }

.link-btn {
  padding: 0 4px;
  border: 0;
  background: none;
  color: var(--accent);
  font-size: 13px;
  white-space: nowrap;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 登录 ---------- */

.auth-wrap {
  display: grid;
  place-items: center;
  min-height: 100vh;
  padding: 24px;
}

.auth-card {
  width: 100%;
  max-width: 380px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
}

.auth-card h1 {
  margin: 22px 0 6px;
  font-size: 24px;
  font-weight: 650;
}

.auth-card .muted {
  margin: 0 0 24px;
  font-size: 13.5px;
}

.field {
  display: grid;
  gap: 6px;
  margin-bottom: 14px;
}
.field > span { font-size: 13px; color: var(--muted); }
.field input,
.field select,
.field textarea {
  width: 100%;
  padding: 9px 11px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: #fff;
}
.field textarea { min-height: 76px; resize: vertical; }

.seg {
  display: inline-flex;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 6px;
  width: fit-content;
}
.seg label { display: inline-flex; cursor: pointer; }
.seg input {
  position: absolute;
  width: 1px;
  height: 1px;
  opacity: 0;
}
.seg span {
  padding: 6px 16px;
  background: #fff;
  color: var(--muted);
  font-size: 13px;
}
.seg label + label span { border-left: 1px solid var(--line); }
.seg input:checked + span { background: var(--ink); color: #fff; }
.seg input:focus-visible + span { outline: 2px solid var(--accent); outline-offset: -2px; }
.field input:focus,
.field select:focus,
.field textarea:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(14, 115, 87, 0.12);
}

.form-error {
  margin: 0 0 12px;
  color: var(--danger);
  font-size: 13px;
}

/* ---------- 顶栏 ---------- */

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(247, 248, 246, 0.92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.topbar-inner {
  display: flex;
  align-items: center;
  gap: 16px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 24px;
  height: 60px;
}

.week-nav {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-left: 8px;
}

.week-label {
  min-width: 64px;
  text-align: center;
  font-size: 14px;
  font-weight: 600;
}
.week-parity {
  margin-left: 6px;
  color: var(--muted);
  font-size: 11px;
  font-weight: 500;
}

.topbar-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-left: auto;
}

/* ---------- 标签页 ---------- */

.tabs {
  display: flex;
  gap: 4px;
  max-width: 1080px;
  margin: 0 auto;
  padding: 18px 24px 0;
}

.tabs button {
  padding: 8px 16px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  color: var(--muted);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
}

.tabs button[aria-selected="true"] {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}

.count {
  display: inline-grid;
  place-items: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  margin-left: 4px;
  border-radius: 9px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 11px;
}

.content {
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 24px 96px;
}

/* ---------- 课表 ---------- */

.today-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  width: 100%;
  margin: 0 0 14px;
  padding: 10px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--ink);
  font-size: 13.5px;
  text-align: left;
  cursor: pointer;
}
.today-bar:hover { border-color: #c3cfc9; }
.today-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.today-bar.soon .today-dot { background: #c98a2e; }
.today-bar.late .today-dot { background: var(--danger); }
.today-bar.late .today-text { color: var(--danger); font-weight: 600; }
.today-more {
  margin-left: auto;
  color: var(--accent);
  font-size: 13px;
  font-weight: 600;
}

.tt-scroll { overflow-x: auto; padding-bottom: 4px; }

.timetable {
  display: grid;
  grid-template-columns: 78px repeat(7, minmax(0, 1fr));
  grid-template-rows: 44px repeat(12, 54px);
  gap: 1px;
  min-width: 760px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--line);
}

.timetable > * { background: #fff; }

.tt-corner { background: #fbfcfb; }

.tt-day {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0;
  background: #fbfcfb;
  font-size: 13px;
  font-weight: 600;
}
.tt-day small { color: var(--muted); font-size: 11px; font-weight: 400; }
.tt-day.today { background: var(--accent-soft); color: var(--accent-ink); }
.tt-day.today small { color: var(--accent-ink); opacity: 0.75; }

.tt-slot {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1px;
  background: #fbfcfb;
  color: var(--muted);
  font: 12px var(--mono);
}
.tt-slot b { font-weight: 600; }
.tt-slot small {
  font-size: 9.5px;
  color: #8a9490;
  white-space: nowrap;
  letter-spacing: 0;
}

.tt-cell {
  border: 0;
  padding: 0;
  background: #fff;
  cursor: pointer;
}
.tt-cell:hover { background: #f2f7f4; }

.course {
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 2px;
  padding: 6px 8px;
  overflow: hidden;
  border: 0;
  border-radius: 6px;
  background: var(--c, var(--accent));
  color: #fff;
  text-align: left;
  cursor: pointer;
}
.course:hover { filter: brightness(1.08); }
.course.conflict {
  outline: 2px dashed rgba(255, 255, 255, 0.85);
  outline-offset: -4px;
}
.course.alt { margin-left: 24%; }
.course strong {
  font-size: 12.5px;
  font-weight: 600;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  overflow-wrap: anywhere;
}
.course span {
  font-size: 11px;
  opacity: 0.85;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  overflow-wrap: anywhere;
}

.empty {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 14px;
}

/* ---------- 作业 ---------- */

.tasks {
  margin: 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  overflow: hidden;
}

.task {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}
.task:last-child { border-bottom: 0; }

.task-check {
  width: 18px;
  height: 18px;
  margin: 2px 0 0;
  accent-color: var(--accent);
  cursor: pointer;
  flex: none;
}

.task-main { flex: 1; min-width: 0; }

.task-title {
  margin: 0;
  font-size: 14.5px;
  overflow-wrap: anywhere;
}

.task-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 6px 0 0;
  font-size: 12.5px;
  color: var(--muted);
}

.tag {
  padding: 1px 7px;
  border-radius: 4px;
  background: color-mix(in srgb, var(--c, #0e7357) 12%, #fff);
  color: var(--c, #0e7357);
  font-size: 11.5px;
}

.due.late { color: var(--danger); font-weight: 600; }
.due.soon { color: #a35a17; font-weight: 600; }

.task.done .task-title { color: #9aa5a1; text-decoration: line-through; }
.task.done .task-meta { opacity: 0.6; }

.subhead {
  margin: 28px 0 10px;
  font-size: 14px;
  font-weight: 600;
  color: var(--muted);
}

/* ---------- 浮动添加按钮 ---------- */

.fab {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 15;
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 0;
  border-radius: 50%;
  background: var(--ink);
  color: #fff;
  font-size: 26px;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 10px 24px -10px rgba(19, 24, 26, 0.55);
}
.fab:hover { background: #000; }

/* ---------- 弹窗 ---------- */

.dialog {
  width: min(520px, calc(100vw - 32px));
  max-height: calc(100vh - 64px);
  overflow-y: auto;
  padding: 0;
  border: 0;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 30px 70px -30px rgba(19, 24, 26, 0.45);
}
.dialog::backdrop { background: rgba(19, 24, 26, 0.38); }

.dialog-form { padding: 24px 24px 20px; }
.dialog-form h2 { margin: 0 0 18px; font-size: 18px; font-weight: 650; }

.periods {
  margin: 0 0 18px;
  padding: 0;
  border: 0;
}
.periods legend {
  margin-bottom: 8px;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
}
.period-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px 14px;
}
.period-row {
  display: flex;
  align-items: center;
  gap: 5px;
  color: var(--muted);
  font-size: 12.5px;
}
.period-row > span { width: 50px; flex: none; }
.period-row input {
  width: 96px;
  padding: 5px 6px;
  border: 1px solid var(--line);
  border-radius: 5px;
  font-size: 12.5px;
}
.period-row input:focus {
  border-color: var(--accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(14, 115, 87, 0.12);
}

.slot-hint {
  margin: -6px 0 14px;
  color: var(--muted);
  font-size: 12.5px;
}

.danger-zone {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin: 4px 0 18px;
  padding: 12px 14px;
  border: 1px solid #f0d3d1;
  border-radius: 8px;
  background: #fdf8f7;
}
.danger-zone strong { display: block; font-size: 13px; }
.danger-zone span { color: var(--muted); font-size: 12px; }

.dialog:has(.periods) {
  width: min(640px, calc(100vw - 32px));
}

.row {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}

.colors {
  display: flex;
  gap: 10px;
  margin: 4px 0 18px;
  padding: 0;
  border: 0;
}
.colors legend {
  margin-bottom: 8px;
  padding: 0;
  color: var(--muted);
  font-size: 13px;
}
.colors label { display: inline-flex; cursor: pointer; }
.colors input { position: absolute; opacity: 0; }
.colors span {
  display: block;
  width: 24px;
  height: 24px;
  border-radius: 6px;
  background: var(--c);
  border: 2px solid #fff;
  box-shadow: 0 0 0 1px var(--line);
}
.colors input:checked + span { box-shadow: 0 0 0 2px var(--ink); }

.dialog-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 6px;
}
.spacer { flex: 1; }

@media (max-width: 640px) {
  .topbar-inner {
    flex-wrap: wrap;
    height: auto;
    gap: 10px;
    padding: 10px 16px;
  }
  .brand { flex: 1; }
  .week-nav { order: 3; width: 100%; margin-left: 0; flex-wrap: wrap; }
  .week-label { min-width: 54px; font-size: 13px; }
  .content { padding: 16px 16px 96px; }
  .tabs { padding: 14px 16px 0; }
  .row { grid-template-columns: 1fr 1fr; }
  .period-grid { grid-template-columns: 1fr; }
  .fab { right: 16px; bottom: 16px; }
  .auth-card { padding: 24px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: 0.01ms !important; }
}

/* ---------- 打印 ---------- */

.print-head { display: none; }

@media print {
  @page { size: A4 landscape; margin: 10mm; }

  body { background: #fff; }
  .topbar,
  .tabs,
  .fab,
  .today-bar,
  .empty { display: none !important; }

  .content { max-width: none; padding: 0; }
  .print-head { display: block; margin-bottom: 10px; }
  .print-head h1 { margin: 0; font-size: 18px; font-weight: 650; }
  .print-head p { margin: 3px 0 0; color: #555; font-size: 12px; }

  .tt-scroll { overflow: visible; }
  .timetable { min-width: 0; width: 100%; border-color: #999; }
  .timetable > *,
  .course {
    print-color-adjust: exact;
    -webkit-print-color-adjust: exact;
  }
  .timetable { break-inside: avoid; }
}