/* 学生端样式 —— 一机一组，手机/平板为主。
   配色与教师端同一套 token（来自课件），不硬编码零散色值。 */
:root {
  --ink: #1b1714;
  --paper: #f6f1e5;
  --paper-line: #dcd3c1;
  --red: #a11f1e;
  --gold: #e8c37a;
  --gold-deep: #b8860b;
  --white: #fffdf7;
  --muted: #6c6259;
  --ok: #1f7a4d;
}

* { box-sizing: border-box; }
html, body { margin: 0; }
body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  background: linear-gradient(180deg, #7d1514 0%, #a11f1e 26%, #f2ecdf 26.01%, #f2ecdf 100%);
  color: var(--ink);
  -webkit-text-size-adjust: 100%;
}
.hidden { display: none !important; }
.grow { flex: 1; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20;
  display: flex; align-items: center; gap: .6rem;
  padding: .7rem 1rem;
  background: rgba(125, 21, 20, .92);
  color: var(--white);
  backdrop-filter: blur(8px);
}
.brand { font-weight: 800; letter-spacing: .08em; font-size: .95rem; }
.badge {
  background: var(--gold); color: var(--ink);
  border-radius: 999px; padding: .15rem .7rem;
  font-size: .82rem; font-weight: 700;
}
.save { font-size: .75rem; color: rgba(255, 253, 247, .7); }
.mini {
  font: inherit; font-size: .8rem; color: var(--white);
  background: rgba(255, 253, 247, .14); border: 1px solid rgba(255, 253, 247, .28);
  border-radius: 999px; padding: .25rem .8rem; cursor: pointer;
}
.mini:hover { background: rgba(255, 253, 247, .26); }

.view { max-width: 760px; margin: 0 auto; padding: 1rem 1rem 4rem; }

/* ---------- 第一屏 ---------- */
.cover { text-align: center; color: var(--white); padding: 1.2rem 0 1.6rem; }
.cover h1 { margin: 0; font-size: clamp(28px, 9vw, 46px); letter-spacing: .18em; }
.cover-sub { margin: .5rem 0 .2rem; font-size: clamp(15px, 4.4vw, 20px); color: var(--gold); font-weight: 700; }
.cover-line { margin: 0; font-size: .82rem; color: rgba(255, 253, 247, .8); }

.card {
  background: var(--white);
  border-radius: 16px;
  padding: 1rem 1.1rem 1.2rem;
  margin-bottom: 1rem;
  box-shadow: 0 8px 26px rgba(80, 40, 30, .12);
}
.card h2 { margin: .1rem 0 .4rem; font-size: 1.05rem; color: var(--red); }
.hintline { margin: 0 0 .8rem; font-size: .82rem; color: var(--muted); line-height: 1.6; }

.groups { display: grid; grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: .6rem; }
.group-card {
  font: inherit; text-align: left; cursor: pointer;
  border: 2px solid var(--paper-line); background: var(--paper);
  border-radius: 12px; padding: .7rem .8rem;
  transition: transform .15s, border-color .15s, box-shadow .15s;
}
.group-card:hover { transform: translateY(-2px); }
.group-card .g-name { display: block; font-weight: 700; font-size: .95rem; }
.group-card .g-state { display: block; margin-top: .2rem; font-size: .74rem; color: var(--muted); }
.group-card.chosen { border-color: var(--red); background: #fff5f2; box-shadow: 0 0 0 3px rgba(161, 31, 30, .12); }
.group-card.chosen .g-name::after { content: " · 本组"; color: var(--red); font-size: .8rem; }

.event-note {
  margin: .9rem 0 1rem; padding: .7rem .8rem;
  background: var(--paper); border-left: 4px solid var(--red);
  border-radius: 8px; font-size: .85rem; line-height: 1.7;
}
.event-note b { color: var(--red); }

/* ---------- 单选/多选项 ---------- */
.opt-row { display: flex; flex-wrap: wrap; gap: .45rem; margin: .3rem 0 .1rem; }
.opt {
  display: inline-flex; align-items: center; gap: .35rem;
  border: 1.5px solid var(--paper-line); background: #fdfaf3;
  border-radius: 999px; padding: .3rem .75rem;
  font-size: .84rem; cursor: pointer; user-select: none;
  transition: background .15s, border-color .15s, color .15s;
}
.opt:hover { border-color: var(--red); }
.opt.on { background: var(--red); border-color: var(--red); color: var(--white); font-weight: 700; }
.opt .box { font-size: .8em; opacity: .75; }
.opt .star { font-size: 1rem; letter-spacing: .05em; }
.opt-form { display: inline-flex; align-items: center; gap: .3rem; font-size: .84rem; color: var(--muted); }

/* ---------- 任务单 ---------- */
.sheetbar { display: flex; align-items: center; gap: .5rem; margin: .2rem 0 .7rem; }
.sheetbar .mini { background: rgba(255, 253, 247, .9); color: var(--red); border-color: rgba(161, 31, 30, .25); }

.sheet { background: transparent; }
.paper {
  background: var(--white); border-radius: 14px; padding: 1rem 1.1rem 1.3rem;
  margin-bottom: 1rem; box-shadow: 0 8px 26px rgba(80, 40, 30, .1);
}
.paper > h2 { margin: .1rem 0 .2rem; font-size: 1.08rem; color: var(--red); }
.paper > .sub { margin: 0 0 .9rem; font-size: .82rem; color: var(--muted); }
.paper .step {
  margin: 1.2rem 0 .6rem; padding: .35rem .7rem;
  background: var(--red); color: var(--white); border-radius: 999px;
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: .04em;
}

.head-grid { display: grid; gap: .7rem; }
.head-row { display: grid; gap: .3rem; }
.head-row > label { font-size: .86rem; font-weight: 700; }
.head-row .inline { display: flex; align-items: center; gap: .4rem; flex-wrap: wrap; font-size: .88rem; }
.head-row .inline input { width: 4.5rem; }

.block { border-top: 1px dashed var(--paper-line); padding-top: .9rem; margin-top: .9rem; }
.block:first-child { border-top: 0; margin-top: 0; padding-top: 0; }
.block-head { display: flex; align-items: baseline; gap: .4rem; flex-wrap: wrap; }
.block-head .num { color: var(--red); font-weight: 800; }
.block-head .lead { font-weight: 700; font-size: .95rem; }
.block-head .optional { font-size: .74rem; color: var(--muted); border: 1px solid var(--paper-line); border-radius: 6px; padding: 0 .3rem; }
.block-tip { margin: .35rem 0 .5rem; font-size: .78rem; color: var(--muted); line-height: 1.6; }
.field { margin: .5rem 0; }
.field > label { display: block; font-size: .84rem; color: var(--ink); margin-bottom: .25rem; }
.field .lbl-strong { font-weight: 700; }

input[type="text"], input[type="number"], textarea, select {
  font: inherit; font-size: .9rem; color: var(--ink);
  background: #fdfaf3; border: 1.5px solid var(--paper-line); border-radius: 9px;
  padding: .45rem .6rem; width: 100%;
}
input:focus, textarea:focus { outline: none; border-color: var(--red); background: #fff; }
textarea { min-height: 3.6rem; resize: vertical; line-height: 1.65; }
.inp-line { display: inline-block; width: auto; min-width: 5rem; }
.wide { width: 100%; }
.date3 { display: flex; align-items: center; gap: .3rem; flex-wrap: wrap; font-size: .9rem; }
.date3 input { width: 4.2rem; }

.role-row { display: grid; grid-template-columns: 1.5rem 1fr; gap: .3rem .6rem; align-items: center; padding: .35rem 0; border-bottom: 1px dashed var(--paper-line); }
.role-row .pick { width: 1.2rem; height: 1.2rem; accent-color: var(--red); }
.role-row .role-name { font-weight: 700; font-size: .9rem; }
.role-row .role-desc { font-size: .76rem; color: var(--muted); }
.role-row .role-who { display: flex; align-items: center; gap: .35rem; font-size: .8rem; color: var(--muted); }
.role-row .role-who input { width: 7rem; }

/* 我的设计描述 */
.desc-box { background: var(--paper); border: 1.5px solid var(--paper-line); border-radius: 12px; padding: .8rem .9rem; }
.desc-box h3 { margin: 0 0 .3rem; font-size: .95rem; color: var(--red); }
.desc-box .note { margin: 0 0 .6rem; font-size: .76rem; color: var(--muted); line-height: 1.6; }
.desc-text { width: 100%; min-height: 7rem; background: #fff; }
.desc-acts { display: flex; flex-wrap: wrap; gap: .45rem; margin-top: .55rem; }
.desc-acts button { font: inherit; font-size: .82rem; cursor: pointer; border-radius: 999px; padding: .3rem .85rem; border: 1.5px solid var(--red); background: #fff; color: var(--red); }
.desc-acts button.solid { background: var(--red); color: var(--white); }

/* AI 生成 */
.ai-stage { display: grid; gap: .8rem; grid-template-columns: 1fr; }
@media (min-width: 620px) { .ai-stage { grid-template-columns: 1fr 1fr; align-items: start; } }
.ai-side h4 { margin: 0 0 .4rem; font-size: .9rem; color: var(--red); }
.ai-work { background: var(--paper); border-radius: 12px; min-height: 9rem; display: grid; place-items: center; padding: .6rem; }
.ai-work img { width: 100%; border-radius: 10px; display: block; }
.ai-work .ph { font-size: .8rem; color: var(--muted); text-align: center; line-height: 1.7; }
.btn {
  font: inherit; font-size: .9rem; cursor: pointer;
  border-radius: 10px; padding: .55rem 1rem; border: 1.5px solid var(--red);
  background: #fff; color: var(--red);
}
.btn.primary { background: var(--red); color: var(--white); border-color: var(--red); font-weight: 700; }
.btn.primary:hover { background: #7d1514; }
.btn:disabled { opacity: .5; cursor: not-allowed; }
.acts { display: flex; flex-wrap: wrap; gap: .5rem; margin-top: .6rem; }

.styles { display: grid; grid-template-columns: repeat(auto-fill, minmax(96px, 1fr)); gap: .6rem; }
.style-card { cursor: pointer; border: 2px solid var(--paper-line); border-radius: 12px; overflow: hidden; background: var(--paper); padding: 0; }
.style-card img { width: 100%; aspect-ratio: 1; object-fit: cover; display: block; }
.style-card .s-name { padding: .35rem 0; text-align: center; font-size: .82rem; font-weight: 700; }
.style-card.on { border-color: var(--red); box-shadow: 0 0 0 3px rgba(161, 31, 30, .12); }

.compare { display: grid; gap: .6rem; grid-template-columns: 1fr; }
@media (min-width: 560px) { .compare { grid-template-columns: 1fr 1fr; } }
.compare figure { margin: 0; }
.compare figcaption { margin-top: .35rem; text-align: center; font-size: .8rem; color: var(--red); font-weight: 700; }
.compare img { width: 100%; border-radius: 10px; background: var(--paper); }

/* 互评 */
.peer { background: var(--white); border-radius: 14px; padding: .9rem 1rem 1.1rem; margin-bottom: 1rem; box-shadow: 0 8px 26px rgba(80, 40, 30, .1); }
.peer h3 { margin: .1rem 0 .4rem; font-size: 1rem; color: var(--red); }
.peer .thumb { width: 100%; border-radius: 10px; background: var(--paper); }
.rev-dims { display: grid; gap: .5rem; margin: .7rem 0; }
.rev-dim { display: grid; grid-template-columns: 1.6rem 5.5rem 1fr; align-items: center; gap: .4rem; }
.rev-dim .d-name { font-weight: 800; color: var(--red); font-size: 1rem; }
.rev-dim .d-mean { font-size: .76rem; color: var(--muted); }
.rev-dim .stars { display: flex; gap: .2rem; }
.star-btn { font-size: 1.3rem; line-height: 1; background: none; border: 0; cursor: pointer; color: #d9d2c4; padding: 0 .1rem; }
.star-btn.on { color: var(--gold-deep); }
.rev-ask { font-size: .8rem; color: var(--muted); margin: .2rem 0 .4rem; }
.mine { color: var(--muted); font-size: .8rem; }

.toast {
  position: fixed; left: 50%; bottom: 1.4rem; transform: translateX(-50%);
  background: rgba(27, 23, 20, .92); color: var(--white);
  border-radius: 999px; padding: .5rem 1.1rem; font-size: .84rem; z-index: 50;
}
.busy {
  position: fixed; left: 50%; top: 42%; transform: translate(-50%, -50%);
  display: flex; align-items: center; gap: .5rem;
  background: rgba(27, 23, 20, .9); color: var(--white);
  border-radius: 12px; padding: .7rem 1.1rem; font-size: .86rem; z-index: 60;
}
.spin { width: 14px; height: 14px; border: 2px solid rgba(255, 253, 247, .35); border-top-color: var(--gold); border-radius: 50%; animation: sp .8s linear infinite; }
@keyframes sp { to { transform: rotate(360deg); } }