/* dehe-learning-companion / 共享样式 —— 浅色主题、移动优先、原生 CSS */
:root{
  --bg:#f6f8fb; --surface:#ffffff; --surface-2:#f0f4f9; --line:#e3e9f1;
  --ink:#1d2733; --ink-2:#5b6b7f; --ink-3:#8b9aad;
  --brand:#2f6fed; --brand-soft:#e8f0ff; --teal:#0e9f8a; --teal-soft:#e2f6f2;
  --amber:#d98b18; --amber-soft:#fff4e0; --rose:#d4576b; --rose-soft:#ffedf0;
  --ok:#0e9f8a; --shadow:0 2px 10px rgba(31,52,86,.06); --radius:14px;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{background:var(--bg);color:var(--ink);font:15px/1.6 -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;-webkit-font-smoothing:antialiased}
a{color:var(--brand);text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{cursor:pointer}
h1,h2,h3,h4{margin:0;font-weight:650;letter-spacing:-.01em}
h1{font-size:20px} h2{font-size:17px} h3{font-size:15px}
p{margin:0 0 10px}
small,.muted{color:var(--ink-3);font-size:12px}
.mono{font-family:ui-monospace,SFMono-Regular,Consolas,monospace;font-size:12px}

.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 20px;background:var(--surface);border-bottom:1px solid var(--line);position:sticky;top:0;z-index:20}
.topbar .brand{display:flex;align-items:center;gap:10px}
.logo{width:30px;height:30px;border-radius:9px;background:linear-gradient(135deg,var(--brand),#5b9bff);display:grid;place-items:center;color:#fff;font-weight:700;font-size:14px}
.topbar .nav{display:flex;gap:6px;flex-wrap:wrap}
.topbar .nav a{padding:6px 11px;border-radius:9px;color:var(--ink-2);font-size:13px}
.topbar .nav a.active,.topbar .nav a:hover{background:var(--brand-soft);color:var(--brand)}

.wrap{max-width:1180px;margin:0 auto;padding:22px 20px 60px}
.wrap.narrow{max-width:520px}
.page-head{display:flex;align-items:flex-end;justify-content:space-between;gap:14px;margin-bottom:18px;flex-wrap:wrap}
.page-head p{color:var(--ink-2);font-size:13px;margin:4px 0 0}

.card{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow);padding:18px;margin-bottom:14px}
.card.tight{padding:14px}
.card h2,.card h3{margin-bottom:12px}
.card .hint{color:var(--ink-2);font-size:12.5px;margin-bottom:12px}

.row{display:flex;gap:10px;align-items:center;flex-wrap:wrap}
.row.between{justify-content:space-between}
.grid{display:grid;gap:14px}
.g2{grid-template-columns:repeat(2,minmax(0,1fr))}
.g3{grid-template-columns:repeat(3,minmax(0,1fr))}
.g4{grid-template-columns:repeat(4,minmax(0,1fr))}
@media(max-width:860px){.g3,.g4{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:560px){.g2,.g3,.g4{grid-template-columns:1fr}}

.btn{border:1px solid var(--line);background:var(--surface);border-radius:10px;padding:9px 14px;font-size:13.5px;transition:.15s;color:var(--ink)}
.btn:hover{border-color:var(--brand);color:var(--brand)}
.btn.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.btn.primary:hover{background:#245fd6;color:#fff}
.btn.ghost{background:transparent;border-color:transparent;color:var(--ink-2)}
.btn.sm{padding:6px 10px;font-size:12px}
.btn:disabled{opacity:.45;cursor:not-allowed}
.field{display:block;margin-bottom:12px}
.field>span{display:block;font-size:12.5px;color:var(--ink-2);margin-bottom:5px;font-weight:600}
input[type=text],input[type=date],select,textarea{width:100%;border:1px solid var(--line);background:#fbfcfe;border-radius:10px;padding:9px 11px;outline:none;transition:.15s}
input:focus,select:focus,textarea:focus{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px var(--brand-soft)}
textarea{resize:vertical;min-height:70px}
.chips{display:flex;gap:7px;flex-wrap:wrap}
.chip{border:1px solid var(--line);background:#fbfcfe;border-radius:999px;padding:7px 13px;font-size:13px;transition:.15s}
.chip:hover{border-color:var(--brand)}
.chip.on{background:var(--brand);border-color:var(--brand);color:#fff}
.tag{display:inline-block;padding:2px 9px;border-radius:999px;font-size:11.5px;font-weight:600}
.tag.ok{background:var(--teal-soft);color:var(--teal)}
.tag.warn{background:var(--amber-soft);color:var(--amber)}
.tag.bad{background:var(--rose-soft);color:var(--rose)}
.tag.info{background:var(--brand-soft);color:var(--brand)}

.notice{border-radius:11px;padding:11px 13px;font-size:13px;margin-bottom:12px;border:1px solid transparent}
.notice.info{background:var(--brand-soft);border-color:#cfe0ff;color:#22468f}
.notice.ok{background:var(--teal-soft);border-color:#c6ece5;color:#0a7a6a}
.notice.warn{background:var(--amber-soft);border-color:#f6dfb6;color:#96620d}
.notice.bad{background:var(--rose-soft);border-color:#f7ccd4;color:#a33a4c}

/* 学生端步骤条 */
.steps{display:flex;gap:6px;margin-bottom:16px}
.steps div{flex:1;text-align:center;font-size:11.5px;color:var(--ink-3);padding:7px 2px;border-radius:8px;background:var(--surface-2)}
.steps div.on{background:var(--brand);color:#fff;font-weight:600}

/* 陪伴区：静态 SVG + CSS 状态机，不依赖任何模型推理 */
.companion{display:flex;align-items:center;gap:14px;background:linear-gradient(135deg,#eef5ff,#f6fbf9);border:1px solid #dfeaf7;border-radius:var(--radius);padding:14px;margin-bottom:14px;position:relative;overflow:hidden}
.companion-stage{width:96px;height:96px;flex:0 0 96px;position:relative}
.companion-stage svg{width:100%;height:100%;display:block}
.bubble{position:relative;background:#fff;border:1px solid var(--line);border-radius:12px;padding:10px 13px;font-size:13px;color:var(--ink-2);box-shadow:var(--shadow);max-width:100%;min-height:38px}
.bubble:before{content:"";position:absolute;left:-6px;top:18px;width:10px;height:10px;background:#fff;border-left:1px solid var(--line);border-bottom:1px solid var(--line);transform:rotate(45deg)}
.companion-meta{margin-top:6px;font-size:11px;color:var(--ink-3)}

/* 状态机动画：class 切换驱动 */
.c-avatar{transform-origin:50% 88%}
.c-book{transform-origin:50% 70%}
.c-arm{transform-origin:50% 20%}
.c-sign{opacity:0;transform-origin:50% 100%}
.stage-idle .c-avatar{animation:sway 3.4s ease-in-out infinite}
.stage-idle .c-book{animation:flip 3.4s ease-in-out infinite}
.stage-studying .c-avatar{animation:breathe 4.2s ease-in-out infinite}
.stage-guiding .c-avatar{animation:turn 2.6s ease-in-out infinite}
.stage-guiding .c-arm{animation:think 2.2s ease-in-out infinite}
.stage-encouraging .c-avatar{animation:bounce .85s ease-in-out infinite}
.stage-encouraging .c-sign{opacity:1;animation:raise 1.1s ease-out}
.stage-encouraging .c-mouth{stroke:var(--teal)}
.stage-resting .c-avatar{animation:peek 3.6s ease-in-out infinite}
@keyframes sway{0%,100%{transform:rotate(-2deg)}50%{transform:rotate(2deg)}}
@keyframes flip{0%,100%{transform:rotate(0)}50%{transform:rotate(-12deg)}}
@keyframes breathe{0%,100%{transform:scale(1)}50%{transform:scale(1.035)}}
@keyframes turn{0%,100%{transform:rotate(0) translateX(0)}50%{transform:rotate(-6deg) translateX(-3px)}}
@keyframes think{0%,100%{transform:rotate(0)}50%{transform:rotate(-22deg)}}
@keyframes bounce{0%,100%{transform:translateY(0)}50%{transform:translateY(-7px)}}
@keyframes raise{from{transform:translateY(14px) rotate(-8deg)}to{transform:translateY(0) rotate(0)}}
@keyframes peek{0%,100%{transform:translateY(4px) scale(.98)}50%{transform:translateY(-3px) scale(1)}}

/* 一次性引导卡片 */
.guide-card{background:linear-gradient(135deg,#eaf2ff,#f2fbf8);border:1px solid #cfe0ff;border-radius:var(--radius);padding:16px;margin-bottom:14px;position:relative;animation:rise .3s ease-out}
.guide-card .close{position:absolute;right:10px;top:10px;border:0;background:rgba(255,255,255,.8);border-radius:8px;width:26px;height:26px;color:var(--ink-2);line-height:1}
.guide-card .label{font-size:11.5px;color:var(--brand);font-weight:700;letter-spacing:.06em;margin-bottom:7px}
.guide-card .text{font-size:15px;line-height:1.8}
.guide-card .foot{margin-top:10px;font-size:11.5px;color:var(--ink-3)}
@keyframes rise{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}

/* 指标卡 */
.metric{background:var(--surface-2);border-radius:11px;padding:11px 12px}
.metric .k{font-size:11.5px;color:var(--ink-2)}
.metric .v{font-size:22px;font-weight:700;letter-spacing:-.02em;margin-top:3px}
.metric .d{font-size:11px;color:var(--ink-3)}

/* 折叠草稿 */
details{border:1px solid var(--line);border-radius:11px;padding:10px 12px;background:#fbfcfe}
summary{cursor:pointer;font-size:13px;font-weight:600;color:var(--ink-2);list-style:none}
summary::-webkit-details-marker{display:none}
summary:before{content:"▸ ";color:var(--brand)}
details[open] summary:before{content:"▾ "}

/* 表格 */
table{width:100%;border-collapse:collapse;font-size:12.5px}
th,td{text-align:left;padding:9px 10px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--ink-2);font-weight:600;background:var(--surface-2);position:sticky;top:0}
tr:hover td{background:#fafcff}
.table-scroll{max-height:520px;overflow:auto;border:1px solid var(--line);border-radius:11px}
.cell-clip{max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* 验收清单 */
.check{display:flex;gap:11px;align-items:flex-start;padding:11px 12px;border:1px solid var(--line);border-radius:11px;margin-bottom:9px;background:#fbfcfe}
.check .dot{width:22px;height:22px;flex:0 0 22px;border-radius:50%;display:grid;place-items:center;color:#fff;font-size:12px;font-weight:700}
.check.pass .dot{background:var(--ok)} .check.pass{border-color:#c6ece5}
.check.fail .dot{background:var(--rose)} .check.fail{border-color:#f7ccd4}
.check .t{font-size:13.5px;font-weight:600}
.check .d{font-size:12px;color:var(--ink-3);margin-top:2px}

.tabs{display:flex;gap:6px;margin-bottom:16px;flex-wrap:wrap}
.tabs button{border:1px solid var(--line);background:var(--surface);border-radius:999px;padding:8px 15px;font-size:13px;color:var(--ink-2)}
.tabs button.on{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}
.hidden{display:none !important}
footer{color:var(--ink-3);font-size:11.5px;text-align:center;padding:24px}
.badge-row{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
.divider{height:1px;background:var(--line);margin:14px 0}
.kbd{background:var(--surface-2);border:1px solid var(--line);border-radius:5px;padding:1px 5px;font-size:11px}

/* v2.2 前后台一致性：移动端导航换行、表头吸顶 */
@media(max-width:720px){
  .topbar{flex-wrap:wrap;padding:12px 14px}
  .topbar .nav{width:100%;gap:4px}
  .topbar .nav a{padding:5px 9px;font-size:12px}
  .page-head{flex-direction:column;align-items:flex-start}
}
.table-scroll table thead th{position:sticky;top:0;background:var(--surface);z-index:2}
.card .grid + .grid{margin-top:10px}