/* ============================================================
   MBA 2601 课程日程表 — 轻量主题（无外部 CSS 依赖）
   亮/暗双主题：跟随系统，也可手动 data-theme 覆盖
   ============================================================ */

:root {
  --bg: #f5f6f8;
  --surface: #ffffff;
  --surface-2: #f8fafc;
  --surface-3: #f1f5f9;
  --border: #e4e7ec;
  --border-strong: #d5d9e0;
  --text: #0f172a;
  --text-2: #334155;
  --muted: #64748b;
  --brand: #2563eb;
  --brand-soft: #eaf1ff;
  --brand-fg: #ffffff;
  --ok: #10b981;
  --warn: #f59e0b;
  --err: #ef4444;
  --info: #6366f1;
  --shadow: 0 1px 2px rgba(15, 23, 42, .05), 0 6px 20px rgba(15, 23, 42, .06);
  --radius: 14px;
  --radius-sm: 9px;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0d1117;
    --surface: #161b22;
    --surface-2: #1c2128;
    --surface-3: #22272e;
    --border: #2a313c;
    --border-strong: #38414d;
    --text: #e6edf3;
    --text-2: #c2cedb;
    --muted: #8b98a5;
    --brand: #3b82f6;
    --brand-soft: #14243d;
    --brand-fg: #ffffff;
    --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
  }
}

:root[data-theme="dark"] {
  --bg: #0d1117;
  --surface: #161b22;
  --surface-2: #1c2128;
  --surface-3: #22272e;
  --border: #2a313c;
  --border-strong: #38414d;
  --text: #e6edf3;
  --text-2: #c2cedb;
  --muted: #8b98a5;
  --brand: #3b82f6;
  --brand-soft: #14243d;
  --shadow: 0 1px 2px rgba(0, 0, 0, .4), 0 8px 24px rgba(0, 0, 0, .35);
}

* { box-sizing: border-box; }

html, body { margin: 0; padding: 0; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
  font-size: 14px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: background-color .2s ease, color .2s ease;
}

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

/* ---------------- 布局骨架 ---------------- */
.shell { width: 100%; max-width: 1280px; margin: 0 auto; padding: 0 16px; }

header.topbar {
  position: sticky;
  top: 0;
  z-index: 40;
  background: color-mix(in srgb, var(--surface) 88%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}

.topbar-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  flex-wrap: wrap;
}

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

.brand-mark {
  width: 40px; height: 40px; flex: none;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--brand), var(--info));
  color: #fff;
  display: grid; place-items: center;
  box-shadow: 0 4px 12px color-mix(in srgb, var(--brand) 35%, transparent);
}

.brand h1 { margin: 0; font-size: 17px; font-weight: 700; letter-spacing: -.2px; }
.brand p { margin: 0; font-size: 12px; color: var(--muted); }

.tools { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }

main { flex: 1; padding: 20px 0 40px; }

/* ---------------- 控件 ---------------- */
.field {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  border-radius: var(--radius-sm);
  padding: 7px 10px;
  font-size: 13px;
  font-family: inherit;
  outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.field:focus { border-color: var(--brand); box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent); }
.field::placeholder { color: var(--muted); }

select.field { cursor: pointer; padding-right: 26px; }

.btn {
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text-2);
  border-radius: var(--radius-sm);
  padding: 7px 12px;
  font-size: 13px;
  font-family: inherit;
  cursor: pointer;
  display: inline-flex; align-items: center; gap: 6px;
  transition: all .15s;
  white-space: nowrap;
}
.btn:hover { background: var(--surface-3); border-color: var(--border-strong); }
.btn:disabled { opacity: .55; cursor: not-allowed; }
.btn-primary { background: var(--brand); border-color: var(--brand); color: var(--brand-fg); }
.btn-primary:hover { background: color-mix(in srgb, var(--brand) 85%, #000); border-color: transparent; }
.btn-sm { padding: 5px 9px; font-size: 12px; }

.icon {
  width: 20px; height: 20px; flex: none;
  border-radius: 7px; display: grid; place-items: center;
  cursor: pointer; border: 1px solid transparent;
  background: transparent; color: var(--muted);
  transition: all .15s;
}
.icon:hover { background: var(--surface-3); color: var(--text); border-color: var(--border); }
.icon svg { width: 15px; height: 15px; }

/* ---------------- 统计卡片 ---------------- */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin-bottom: 16px; }
@media (max-width: 900px) { .stats { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 480px) { .stats { grid-template-columns: 1fr; } }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
}

.stat { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.stat > div:first-child { min-width: 0; flex: 1 1 auto; }
.stat-label { font-size: 12px; color: var(--muted); font-weight: 500; display: flex; align-items: baseline; gap: 6px; flex-wrap: wrap; }
.stat-value { font-size: 22px; font-weight: 700; letter-spacing: -.4px; margin-top: 2px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.stat-sub { font-size: 11.5px; color: var(--muted); margin-top: 1px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
#nextCountdown { font-size: 11px; color: var(--brand); font-weight: 700; white-space: nowrap; }
#filterHint { white-space: normal; overflow: visible; line-height: 1.45; }
.stat-icon { width: 38px; height: 38px; border-radius: 11px; display: grid; place-items: center; font-size: 17px; flex: none; }
.dot-status { font-size: 12.5px; font-weight: 600; display: flex; align-items: center; gap: 6px; min-width: 0; }
.dot-status > span:last-child { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.dot { width: 8px; height: 8px; border-radius: 50%; background: var(--muted); flex: none; }
.dot.live { background: var(--ok); box-shadow: 0 0 0 3px color-mix(in srgb, var(--ok) 22%, transparent); animation: pulse 2.4s infinite; }
.dot.down { background: var(--err); box-shadow: 0 0 0 3px color-mix(in srgb, var(--err) 22%, transparent); }
.dot.loading { background: var(--warn); box-shadow: 0 0 0 3px color-mix(in srgb, var(--warn) 22%, transparent); animation: pulse 1.2s infinite; }
@keyframes pulse { 0%,100% { opacity: 1; } 50% { opacity: .45; } }

/* ---------------- 主区：日历 + 侧栏 ---------------- */
.layout { display: grid; grid-template-columns: 1fr 300px; gap: 16px; align-items: stretch; }
@media (max-width: 1024px) { .layout { grid-template-columns: 1fr; } }

.panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px;
}

.panel-head { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 10px; }
.panel-title { font-size: 13px; font-weight: 700; letter-spacing: .2px; }

.panel-side { display: flex; flex-direction: column; min-height: 0; }
.panel-side .upcoming { flex: 1 1 auto; min-height: 0; max-height: none; }
@media (max-width: 1024px) { .panel-side .upcoming { max-height: 320px; } }

.upcoming { list-style: none; margin: 0; padding: 0 4px 0 0; overflow-y: auto; }
.upcoming.faded {
  -webkit-mask-image: linear-gradient(180deg, #000 calc(100% - 20px), transparent 100%);
  mask-image: linear-gradient(180deg, #000 calc(100% - 20px), transparent 100%);
}
.upcoming li { display: flex; gap: 9px; padding: 7px 6px; border-radius: var(--radius-sm); cursor: pointer; transition: background .15s; }
.upcoming li:hover { background: var(--surface-3); }
.upcoming li + li { border-top: 1px solid var(--border); }
.up-bar { width: 3px; border-radius: 3px; flex: none; background: var(--brand); }
.up-date { font-size: 11px; color: var(--muted); font-variant-numeric: tabular-nums; white-space: nowrap; width: 44px; flex: none; }
.up-title { font-size: 12.5px; font-weight: 600; color: var(--text); display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.up-meta { font-size: 11px; color: var(--muted); display: block; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.empty { color: var(--muted); font-size: 12.5px; text-align: center; padding: 24px 0; }

/* ---------------- FullCalendar 主题适配 ---------------- */
.fc {
  --fc-border-color: var(--border);
  --fc-button-bg-color: var(--surface);
  --fc-button-border-color: var(--border);
  --fc-button-text-color: var(--text-2);
  --fc-button-hover-bg-color: var(--surface-3);
  --fc-button-hover-border-color: var(--border-strong);
  --fc-button-active-bg-color: var(--brand);
  --fc-button-active-border-color: var(--brand);
  --fc-button-active-text-color: var(--brand-fg);
  --fc-today-bg-color: var(--brand-soft);
  --fc-neutral-bg-color: var(--surface-2);
  --fc-list-event-hover-bg-color: var(--surface-3);
  --fc-page-bg-color: var(--surface);
  --fc-highlight-color: var(--brand-soft);
  font-size: 13px;
}
.fc .fc-toolbar { flex-wrap: wrap; gap: 8px; margin-bottom: 12px !important; }
.fc .fc-toolbar-title { font-size: 16px; font-weight: 700; letter-spacing: -.2px; color: var(--text); }
.fc .fc-button { border-radius: 8px !important; font-weight: 500; padding: 6px 11px; box-shadow: none !important; text-transform: none; }
.fc .fc-button:focus { box-shadow: 0 0 0 3px color-mix(in srgb, var(--brand) 18%, transparent) !important; }
.fc-theme-standard th, .fc-theme-standard td { border-color: var(--border); }
.fc-col-header-cell { background: var(--surface-2); }
.fc .fc-col-header-cell-cushion, .fc .fc-daygrid-day-number { color: var(--muted); text-decoration: none; padding: 5px 7px; font-weight: 600; font-size: 12.5px; }
.fc .fc-day-today .fc-daygrid-day-number { color: var(--brand); font-weight: 800; }
.fc-daygrid-day-frame { min-height: 96px; }
.fc .fc-daygrid-event { padding: 1px 4px; }
.fc-event, .fc-daygrid-event {
  border-radius: 7px !important;
  border: none !important;
  padding: 2px 5px;
  font-size: 12px;
  cursor: pointer;
  box-shadow: 0 1px 2px rgba(0, 0, 0, .12);
  max-width: 100%;
  overflow: hidden;
}
.fc .fc-daygrid-event-harness,
.fc .fc-daygrid-day-events,
.fc .fc-event-main {
  min-width: 0;
  max-width: 100%;
  overflow: hidden;
}
.fc-event-title, .fc-event-time { font-weight: 500; }
.fc .fc-event-title { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.fc-daygrid-event-dot { border-width: 3px; }

/* 自定义月视图事件内容：必须允许收缩，否则长标题会溢出到相邻日期格 */
.course-block {
  display: flex;
  align-items: center;
  gap: 4px;
  width: 100%;
  min-width: 0;
  overflow: hidden;
  font-size: 11.5px;
  line-height: 1.3;
}
.course-block .seq {
  flex: 0 0 auto;
  font-variant-numeric: tabular-nums;
  color: inherit;
  opacity: .8;
  font-weight: 600;
  font-size: 10.5px;
}
.course-block .cname {
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.fc .fc-list-table td, .fc .fc-list-table th { border-color: var(--border); color: var(--text-2); }
.fc .fc-list-day-cushion { background: var(--surface-2); }
.fc .fc-list-event-title a { color: var(--text); }
.fc-timegrid-slot-label { color: var(--muted); font-size: 11px; }
.fc .fc-more-link { color: var(--brand); font-size: 11.5px; font-weight: 600; }
.calendar-wrap { min-height: 620px; }

.course-block { display: flex; align-items: center; gap: 6px; font-size: 12.5px; }
.seq { font-variant-numeric: tabular-nums; color: var(--muted); font-weight: 600; }

/* ---------------- 设置面板 ---------------- */
.settings {
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}
.settings-inner { padding: 12px 0; display: flex; flex-wrap: wrap; align-items: flex-end; gap: 10px; }
.field-block { display: flex; flex-direction: column; gap: 5px; }
.field-block > label { font-size: 11px; font-weight: 700; letter-spacing: .6px; text-transform: uppercase; color: var(--muted); }
.field-block .field { min-width: 220px; }
.hidden { display: none !important; }

/* ---------------- 弹窗 ---------------- */
.modal {
  position: fixed; inset: 0; z-index: 60;
  background: rgba(15, 23, 42, .55);
  display: flex; align-items: center; justify-content: center;
  padding: 16px;
  animation: fade .15s ease;
}
@keyframes fade { from { opacity: 0; } to { opacity: 1; } }
.modal-card {
  background: var(--surface);
  color: var(--text);
  border-radius: 16px;
  width: 100%; max-width: 540px;
  max-height: 88vh; overflow: auto;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .3);
  border: 1px solid var(--border);
  animation: pop .18s cubic-bezier(.2, .9, .3, 1.2);
}
@keyframes pop { from { transform: translateY(12px) scale(.98); opacity: 0; } }
.modal-head { padding: 18px 20px 12px; border-bottom: 1px solid var(--border); display: flex; align-items: flex-start; justify-content: space-between; gap: 12px; }
.modal-head h3 { margin: 0; font-size: 16.5px; font-weight: 700; line-height: 1.4; }
.modal-body { padding: 16px 20px; display: grid; gap: 12px; }
.modal-foot { padding: 12px 20px 18px; display: flex; justify-content: flex-end; gap: 8px; flex-wrap: wrap; }
.kv { display: grid; grid-template-columns: 74px 1fr; gap: 10px; align-items: start; font-size: 13px; }
.kv > span:first-child { color: var(--muted); font-weight: 600; }
.kv > span:last-child { color: var(--text-2); }
.desc-box {
  background: var(--surface-2); border: 1px solid var(--border);
  border-radius: 10px; padding: 10px 12px;
  font-size: 12.5px; color: var(--text-2);
  white-space: pre-wrap; word-break: break-word; max-height: 200px; overflow: auto; margin-top: 6px;
}
.pill { display: inline-flex; align-items: center; gap: 5px; font-size: 12px; padding: 3px 9px; border-radius: 999px; background: var(--surface-3); color: var(--text-2); border: 1px solid var(--border); }

/* ---------------- Toast ---------------- */
.toast-box { position: fixed; right: 16px; bottom: 16px; z-index: 80; display: flex; flex-direction: column; gap: 8px; align-items: flex-end; }
.toast {
  background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-left: 3px solid var(--brand);
  border-radius: 10px; padding: 10px 14px; font-size: 12.5px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, .18);
  animation: slide .2s ease;
  max-width: 340px;
}
.toast.err { border-left-color: var(--err); }
.toast.ok { border-left-color: var(--ok); }
@keyframes slide { from { transform: translateX(16px); opacity: 0; } }

/* ---------------- 骨架屏 ---------------- */
.skeleton { position: relative; overflow: hidden; background: var(--surface-3); border-radius: 6px; }
.skeleton::after {
  content: ""; position: absolute; inset: 0; transform: translateX(-100%);
  background: linear-gradient(90deg, transparent, color-mix(in srgb, var(--surface) 70%, transparent), transparent);
  animation: shimmer 1.4s infinite;
}
@keyframes shimmer { 100% { transform: translateX(100%); } }
.sk-line { height: 12px; margin: 8px 0; }
.sk-block { height: 560px; border-radius: var(--radius); }

.spin { animation: rot 1s linear infinite; }
@keyframes rot { to { transform: rotate(360deg); } }

@media (max-width: 640px) {
  .brand h1 { font-size: 15px; }
  .tools { width: 100%; }
  .tools .search-field { flex: 1 1 160px; }
  .panel-side { order: -1; }
  .upcoming { max-height: 280px; }
}