:root {
  --bg: #f4f6fb;
  --card: #ffffff;
  --ink: #1c2430;
  --ink-2: #5a6a80;
  --line: #e3e9f2;
  --primary: #3b6ef6;
  --primary-d: #2a54c4;
  --ok: #2fa06a;
  --warn: #d97706;
  --bad: #d64545;
  --course: #93a8c9;
  --task: #4f8ef7;
  --deep: #7c5cbf;
  --locked: #d64545;
  --radius: 12px;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: "PingFang SC","Microsoft YaHei",system-ui,sans-serif; background: var(--bg); color: var(--ink); font-size: 14px; }
button { font-family: inherit; cursor: pointer; }
input, select { font-family: inherit; }

/* 顶栏 */
.topbar { display: flex; justify-content: space-between; align-items: center; padding: 12px 20px; background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 30; }
.brand h1 { font-size: 18px; }
.brand .tag { font-size: 12px; color: var(--ink-2); margin-left: 10px; }
.top-actions { display: flex; gap: 8px; }

/* 按钮 */
.btn { border: 1px solid var(--line); background: #fff; padding: 7px 14px; border-radius: 8px; font-size: 13px; transition: .15s; }
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn.primary { background: var(--primary); border-color: var(--primary); color: #fff; }
.btn.primary:hover { background: var(--primary-d); color: #fff; }
.btn.small { padding: 5px 10px; }
.btn.block { width: 100%; margin-top: 8px; }
.btn.ghost { border-color: transparent; background: #eef2fb; }
.btn.danger:hover { color: var(--bad); border-color: var(--bad); }

/* 布局 */
.layout { display: grid; grid-template-columns: 360px 1fr; gap: 14px; padding: 14px; align-items: start; }
@media (max-width: 980px) { .layout { grid-template-columns: 1fr; } }
.panel { min-width: 0; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px 16px; margin-bottom: 12px; }
.card h2 { font-size: 14px; margin-bottom: 10px; color: var(--ink); display: flex; align-items: center; gap: 6px; }
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 8px 10px; }
.form-grid.three { grid-template-columns: 1fr 1fr 1.2fr; }
.form-grid label { display: flex; flex-direction: column; gap: 4px; font-size: 12px; color: var(--ink-2); }
.form-grid input, .form-grid select { font-size: 13px; padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #fff; }
.hint { font-size: 12px; color: var(--ink-2); margin-top: 8px; line-height: 1.6; }

/* 行内录入 */
.row { display: flex; gap: 6px; align-items: center; margin-bottom: 8px; flex-wrap: wrap; }
.row input, .row select { padding: 6px 8px; border: 1px solid var(--line); border-radius: 8px; font-size: 13px; }
.grow { flex: 1; min-width: 80px; }
.w60 { width: 68px; }
.checkrow { gap: 14px; font-size: 12px; color: var(--ink-2); flex-wrap: wrap; }
.checkrow label { display: inline-flex; align-items: center; gap: 4px; cursor: pointer; }

/* 课程 chips 与任务列表 */
.chip-list { display: flex; flex-wrap: wrap; gap: 6px; }
.chip { background: #eef2fb; border: 1px solid var(--line); border-radius: 999px; padding: 3px 6px 3px 10px; font-size: 12px; display: inline-flex; align-items: center; gap: 6px; }
.chip button { border: 0; background: none; color: var(--ink-2); font-size: 13px; padding: 0 2px; }
.chip button:hover { color: var(--bad); }
.task-list { margin-top: 8px; display: flex; flex-direction: column; gap: 6px; max-height: 260px; overflow-y: auto; }
.task-item { border: 1px solid var(--line); border-radius: 10px; padding: 7px 10px; font-size: 12px; display: flex; justify-content: space-between; gap: 8px; background: #fbfcfe; }
.task-item .t-title { font-weight: 600; }
.task-item .t-meta { color: var(--ink-2); margin-left: 6px; font-weight: 400; }
.task-item .del { border: 0; background: none; color: var(--ink-2); }
.task-item .del:hover { color: var(--bad); }
.task-item.locked-badge { border-left: 3px solid var(--locked); }
.badge { font-size: 10px; padding: 1px 6px; border-radius: 999px; color: #fff; }
.badge.p5 { background: #d64545; } .badge.p4 { background: #e07b39; } .badge.p3 { background: #3b6ef6; } .badge.p2 { background: #2fa06a; } .badge.p1 { background: #8aa7c4; }

/* 图例 */
.legend { display: flex; gap: 14px; align-items: center; padding: 8px 4px 12px; flex-wrap: wrap; font-size: 12px; color: var(--ink-2); }
.dot { display: inline-block; width: 10px; height: 10px; border-radius: 3px; margin-right: 4px; vertical-align: -1px; }
.dot.course { background: var(--course); } .dot.task { background: var(--task); } .dot.deep { background: var(--deep); } .dot.locked { background: var(--locked); }

/* 时间轴 */
.timeline { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); overflow-x: auto; padding-bottom: 6px; }
.tl-grid { display: grid; grid-template-columns: 46px repeat(7, minmax(120px, 1fr)); min-width: 900px; }
.tl-gutter { position: relative; height: 620px; border-right: 1px solid var(--line); }
.tl-hour { position: absolute; right: 4px; font-size: 10px; color: var(--ink-2); transform: translateY(-6px); }
.tl-col { border-right: 1px solid #f0f3f9; }
.tl-col.today { background: #f6f9ff; }
.tl-head { text-align: center; padding: 8px 2px; font-size: 12px; border-bottom: 1px solid var(--line); color: var(--ink-2); }
.tl-head b { display: block; color: var(--ink); font-size: 13px; }
.tl-head.today b { color: var(--primary); }
.tl-body { position: relative; height: 620px; }
.tl-body .hourline { position: absolute; left: 0; right: 0; border-top: 1px dashed #eef1f7; }
.block { position: absolute; border-radius: 6px; overflow: hidden; cursor: pointer; padding: 2px 6px; font-size: 11px; color: #fff; box-shadow: 0 1px 2px rgba(20,30,50,.15); transition: .1s; }
.block:hover { filter: brightness(1.07); }
.block.course { background: var(--course); cursor: default; }
.block.task { background: var(--task); }
.block.deep { background: var(--deep); }
.block.locked { outline: 2px solid var(--locked); }
.block .b-time { font-size: 10px; opacity: .85; }
.block .b-title { white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.block.p4 { box-shadow: inset 3px 0 0 rgba(0,0,0,.25); }
.block.p5 { box-shadow: inset 4px 0 0 rgba(0,0,0,.35); }
.block .lock-ico { float: right; }

/* 弹层 */
.pop { position: fixed; z-index: 60; background: #fff; border: 1px solid var(--line); border-radius: 10px; box-shadow: 0 8px 24px rgba(20,30,60,.18); padding: 10px; width: 220px; font-size: 13px; }
.pop h4 { font-size: 13px; margin-bottom: 2px; }
.pop .p-time { color: var(--ink-2); font-size: 12px; margin-bottom: 8px; }
.pop .p-actions { display: flex; gap: 6px; flex-wrap: wrap; }
.pop .p-actions button { flex: 1; }

/* toast */
.toasts { position: fixed; top: 60px; right: 16px; z-index: 90; display: flex; flex-direction: column; gap: 8px; max-width: 420px; }
.toast { background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--primary); border-radius: 10px; box-shadow: 0 6px 18px rgba(20,30,60,.12); padding: 10px 14px; font-size: 13px; animation: slidein .25s ease; }
.toast.warn { border-left-color: var(--warn); }
.toast.bad { border-left-color: var(--bad); }
.toast.ok { border-left-color: var(--ok); }
@keyframes slidein { from { opacity: 0; transform: translateX(16px); } }

/* unmet */
.unmet { margin-top: 12px; background: #fff7ec; border: 1px solid #f2d9b3; border-radius: var(--radius); padding: 12px 16px; }
.unmet h3 { font-size: 13px; color: var(--warn); margin-bottom: 6px; }
.unmet li { font-size: 13px; margin: 4px 0 4px 18px; color: #7a5410; }
.hidden { display: none; }