/* AI提分系统 —— 亮色系 · 手机/iPad/电脑自适应 */
:root {
  --bg: #f4f7fc;
  --card: #ffffff;
  --ink: #1c2333;
  --sub: #66708c;
  --line: #e6eaf3;
  --pri: #2f6bff;
  --pri-soft: #eaf0ff;
  --ok: #00b374;
  --ok-soft: #e6f9f1;
  --acc: #ff8f1f;
  --acc-soft: #fff3e3;
  --warn: #e5484d;
  --warn-soft: #ffecec;
  --radius: 16px;
  --shadow: 0 4px 16px rgba(28, 43, 82, .08);
}
* { margin: 0; padding: 0; box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  background: var(--bg); color: var(--ink); font-size: 16px; line-height: 1.55;
}
button { font-family: inherit; }

/* ---------- 顶栏 ---------- */
.topbar {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 10px;
  padding: 10px 16px; padding-top: calc(10px + env(safe-area-inset-top));
  background: rgba(255,255,255,.92); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.brand { display: flex; align-items: center; gap: 10px; min-width: 0; }
.logo {
  flex: none; width: 38px; height: 38px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, #2f6bff, #00b374);
  color: #fff; font-weight: 800; font-size: 15px;
}
.brand-t b { display: block; font-size: 17px; letter-spacing: .5px; }
.brand-t i { display: block; font-style: normal; font-size: 11px; color: var(--sub); }

/* ---------- 导航（手机：底部；电脑：左侧） ---------- */
#nav {
  position: fixed; z-index: 60; left: 0; right: 0; bottom: 0;
  display: flex; background: #fff; border-top: 1px solid var(--line);
  padding-bottom: env(safe-area-inset-bottom);
}
#nav button {
  flex: 1; border: 0; background: none; cursor: pointer;
  display: flex; flex-direction: column; align-items: center; gap: 2px;
  padding: 7px 0 6px; font-size: 19px; color: var(--sub);
}
#nav button span { font-size: 10.5px; }
#nav button.on { color: var(--pri); font-weight: 600; }
#nav button.on span { font-weight: 700; }

main { padding: 14px 14px calc(80px + env(safe-area-inset-bottom)); max-width: 1080px; margin: 0 auto; }

/* ---------- 通用卡片/按钮 ---------- */
.card {
  background: var(--card); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 16px; margin-bottom: 14px;
}
.card h3 { font-size: 16px; margin-bottom: 10px; }
h2.page-t { font-size: 20px; margin: 6px 2px 12px; }
.sub { color: var(--sub); font-size: 13px; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 0; cursor: pointer; border-radius: 12px;
  padding: 12px 20px; font-size: 15px; font-weight: 600;
  background: linear-gradient(135deg, #2f6bff, #1e4fd6); color: #fff;
  box-shadow: 0 4px 12px rgba(47,107,255,.3);
}
.btn:active { transform: scale(.97); }
.btn.green { background: linear-gradient(135deg, #00c389, #00915f); box-shadow: 0 4px 12px rgba(0,179,116,.3); }
.btn.orange { background: linear-gradient(135deg, #ffa02e, #f07d00); box-shadow: 0 4px 12px rgba(255,143,31,.3); }
.btn.ghost { background: var(--pri-soft); color: var(--pri); box-shadow: none; }
.btn.line { background: #fff; color: var(--ink); border: 1.5px solid var(--line); box-shadow: none; }
.btn.small { padding: 7px 12px; font-size: 13px; border-radius: 10px; }
.btn.block { width: 100%; }
.btn:disabled { opacity: .45; cursor: not-allowed; }
.row { display: flex; gap: 10px; flex-wrap: wrap; }
.grow { flex: 1; }

/* ---------- 首页 Hero ---------- */
.hero {
  border-radius: 20px; padding: 26px 20px; margin-bottom: 14px;
  background: linear-gradient(135deg, #2f6bff 0%, #245fe0 45%, #00b374 120%);
  color: #fff; box-shadow: 0 10px 24px rgba(47,107,255,.28);
}
.hero h1 { font-size: 26px; letter-spacing: 1px; }
.hero p { margin-top: 6px; font-size: 13.5px; opacity: .92; }
.hero .tagline {
  display: inline-block; margin-bottom: 10px; padding: 3px 10px;
  background: rgba(255,255,255,.18); border-radius: 999px; font-size: 12px;
}
.hero .row { margin-top: 16px; }
.hero .btn.line { background: rgba(255,255,255,.14); color: #fff; border-color: rgba(255,255,255,.55); }

.stat-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; margin-bottom: 14px; }
.stat { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; }
.stat .k { font-size: 12px; color: var(--sub); }
.stat .v { font-size: 22px; font-weight: 800; margin-top: 2px; }
.stat .v em { font-style: normal; font-size: 12px; font-weight: 600; color: var(--sub); }
.stat.blue .v { color: var(--pri); } .stat.green .v { color: var(--ok); }
.stat.orange .v { color: var(--acc); } .stat.red .v { color: var(--warn); }

.feature-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.feat { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 14px; cursor: pointer; border: 1.5px solid transparent; }
.feat:active { border-color: var(--pri); }
.feat .ic { font-size: 24px; }
.feat b { display: block; margin: 6px 0 2px; font-size: 14.5px; }
.feat i { font-style: normal; font-size: 12px; color: var(--sub); }

/* ---------- 表单 ---------- */
.field { margin-bottom: 14px; }
.field label { display: block; font-size: 13.5px; font-weight: 600; margin-bottom: 6px; }
.field select, .field input[type=number], .field input[type=text] {
  width: 100%; padding: 11px 12px; font-size: 15px;
  border: 1.5px solid var(--line); border-radius: 12px; background: #fbfcff; color: var(--ink);
}
.field select:focus, .field input:focus { outline: none; border-color: var(--pri); }
.rate-item { margin-bottom: 12px; }
.rate-item .rt { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 4px; }
.rate-item .rt b { font-weight: 600; }
.rate-item .rt output { color: var(--pri); font-weight: 700; }
.rate-item input[type=range] { width: 100%; accent-color: var(--pri); }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }

/* ---------- 诊断结果 ---------- */
.band-chip {
  display: inline-block; padding: 4px 12px; border-radius: 999px;
  background: var(--acc-soft); color: var(--acc); font-weight: 700; font-size: 13px;
}
.predict {
  display: flex; align-items: baseline; gap: 8px;
  background: linear-gradient(135deg, #00c389, #00915f);
  color: #fff; border-radius: var(--radius); padding: 16px; margin: 12px 0;
}
.predict .num { font-size: 34px; font-weight: 800; }
.predict .cap { font-size: 13px; opacity: .92; }
.sum-li { display: flex; gap: 8px; margin-bottom: 8px; font-size: 14px; }
.sum-li::before { content: "▸"; color: var(--pri); font-weight: 700; }
.adv-li { display: flex; gap: 8px; margin-bottom: 8px; font-size: 14px; }
.adv-li::before { content: "✓"; color: var(--ok); font-weight: 700; }
.weak-list { margin-top: 10px; }
.weak-row { display: flex; align-items: center; gap: 10px; padding: 8px 0; border-top: 1px dashed var(--line); font-size: 14px; }
.weak-row .nm { width: 96px; flex: none; font-weight: 600; }
.weak-row .bar { flex: 1; height: 8px; border-radius: 99px; background: var(--line); overflow: hidden; }
.weak-row .bar i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, var(--acc), var(--warn)); }
.weak-row .g { flex: none; width: 86px; text-align: right; color: var(--ok); font-weight: 700; font-size: 13px; }

/* ---------- 计划 ---------- */
.progress-wrap { margin-bottom: 14px; }
.progress-top { display: flex; justify-content: space-between; font-size: 13.5px; margin-bottom: 6px; }
.progress { height: 10px; border-radius: 99px; background: var(--line); overflow: hidden; }
.progress i { display: block; height: 100%; border-radius: 99px; background: linear-gradient(90deg, #2f6bff, #00b374); transition: width .3s; }
.week-head { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.week-head .goal { font-size: 12px; color: var(--sub); }
.day-row {
  display: flex; align-items: flex-start; gap: 10px;
  padding: 10px 2px; border-top: 1px dashed var(--line); font-size: 14px;
}
.day-row .d { flex: none; width: 40px; color: var(--sub); font-size: 12.5px; padding-top: 2px; }
.day-row .t { flex: 1; }
.day-row.done .t { color: var(--sub); text-decoration: line-through; }
.ck {
  flex: none; width: 22px; height: 22px; margin-top: 1px;
  border: 2px solid #c6cede; border-radius: 7px; background: #fff; cursor: pointer;
  display: grid; place-items: center; font-size: 13px; color: transparent;
}
.day-row.done .ck { background: var(--ok); border-color: var(--ok); color: #fff; }
.mini-link { flex: none; }

/* ---------- 练习 ---------- */
.tabs { display: flex; gap: 8px; margin-bottom: 14px; background: var(--pri-soft); padding: 4px; border-radius: 12px; }
.tabs button { flex: 1; border: 0; background: none; padding: 9px 0; border-radius: 9px; font-size: 14px; font-weight: 600; color: var(--sub); cursor: pointer; }
.tabs button.on { background: #fff; color: var(--pri); box-shadow: 0 2px 6px rgba(47,107,255,.15); }
.chips { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 12px; }
.chip {
  padding: 8px 14px; border-radius: 999px; border: 1.5px solid var(--line);
  background: #fff; font-size: 13.5px; cursor: pointer; color: var(--ink);
}
.chip.on { background: var(--pri); border-color: var(--pri); color: #fff; font-weight: 600; }
.q-meta { display: flex; justify-content: space-between; font-size: 12.5px; color: var(--sub); margin-bottom: 8px; }
.q-text { font-size: 16.5px; font-weight: 600; margin-bottom: 14px; }
.opt {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  padding: 12px 14px; margin-bottom: 9px; border-radius: 12px;
  border: 1.5px solid var(--line); background: #fbfcff; font-size: 15px; cursor: pointer;
}
.opt .abc { flex: none; width: 26px; height: 26px; border-radius: 8px; background: var(--pri-soft); color: var(--pri); display: grid; place-items: center; font-weight: 700; font-size: 13px; }
.opt.correct { border-color: var(--ok); background: var(--ok-soft); }
.opt.correct .abc { background: var(--ok); color: #fff; }
.opt.wrong { border-color: var(--warn); background: var(--warn-soft); }
.opt.wrong .abc { background: var(--warn); color: #fff; }
.opt:disabled { cursor: default; }
.explain { background: var(--acc-soft); border-radius: 12px; padding: 12px; font-size: 13.5px; margin: 10px 0; }
.score-hero { text-align: center; padding: 26px 16px; }
.score-hero .big { font-size: 44px; font-weight: 800; color: var(--pri); }
.score-hero .big em { font-style: normal; font-size: 20px; color: var(--sub); }

/* ---------- 错题本 ---------- */
.m-card { border-left: 4px solid var(--acc); }
.m-card.ok { border-left-color: var(--ok); }
.m-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 6px; }
.tag { font-size: 11px; padding: 2px 8px; border-radius: 999px; background: var(--pri-soft); color: var(--pri); font-weight: 600; }
.tag.warn { background: var(--warn-soft); color: var(--warn); }
.tag.ok { background: var(--ok-soft); color: var(--ok); }
.m-q { font-size: 14.5px; font-weight: 600; margin-bottom: 6px; }
.m-e { font-size: 13px; color: var(--sub); margin-bottom: 8px; }

/* ---------- 图表 ---------- */
.chart { width: 100%; height: auto; display: block; }
.rg { fill: none; stroke: var(--line); stroke-width: 1; }
.al { stroke: var(--line); stroke-width: 1; }
.lt { font-size: 11px; fill: var(--sub); }
.rp { fill: rgba(47,107,255,.18); stroke: var(--pri); stroke-width: 2; }
.rd { fill: var(--pri); }
.rc { fill: var(--pri); }
.vt { font-size: 10px; fill: var(--pri); font-weight: 700; }
.gl { stroke: var(--line); stroke-width: 1; }
.glt { font-size: 10px; fill: var(--sub); }
.lp { fill: none; stroke: var(--pri); stroke-width: 2.5; stroke-linecap: round; }
.ld { fill: #fff; stroke: var(--pri); stroke-width: 2.5; }
.lvt { font-size: 11px; fill: var(--pri); font-weight: 700; }
.llb { font-size: 10px; fill: var(--sub); }
.chart2col { display: grid; grid-template-columns: 1fr; gap: 14px; }

/* ---------- 空状态 / 提示 ---------- */
.empty { text-align: center; padding: 40px 20px; }
.empty .ic { font-size: 46px; }
.empty b { display: block; margin: 10px 0 4px; }
.empty p { color: var(--sub); font-size: 13.5px; margin-bottom: 16px; }
.tip { color: var(--sub); font-size: 13px; }

/* ---------- Toast ---------- */
#toast {
  position: fixed; left: 50%; bottom: calc(96px + env(safe-area-inset-bottom));
  transform: translateX(-50%) translateY(16px);
  background: rgba(28,35,51,.92); color: #fff; font-size: 13.5px;
  padding: 10px 18px; border-radius: 999px; opacity: 0; pointer-events: none;
  transition: all .25s; z-index: 99; max-width: 86vw; text-align: center;
}
#toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .stat-grid { grid-template-columns: repeat(4, 1fr); }
  .feature-grid { grid-template-columns: repeat(4, 1fr); }
  .chart2col { grid-template-columns: 1fr 1fr; }
  main { padding: 20px 24px calc(80px + env(safe-area-inset-bottom)); }
}

/* ---------- 电脑端：左侧导航 ---------- */
@media (min-width: 920px) {
  #nav {
    left: 0; right: auto; top: 0; bottom: 0; width: 208px;
    flex-direction: column; border-top: 0; border-right: 1px solid var(--line);
    padding: 76px 10px 16px; gap: 4px;
  }
  #nav button { flex: none; flex-direction: row; justify-content: flex-start; gap: 12px;
    padding: 12px 14px; border-radius: 12px; font-size: 20px; }
  #nav button span { font-size: 15px; }
  #nav button.on { background: var(--pri-soft); }
  main { margin-left: 208px; padding: 20px 28px 40px; }
  .hero { padding: 40px 34px; }
  .hero h1 { font-size: 34px; }
  #toast { bottom: 40px; }
}

/* ---------- 打印（家长版报告） ---------- */
@media print {
  .no-print { display: none !important; }
  body { background: #fff; }
  main { padding: 0; margin: 0; }
  .card { box-shadow: none; border: 1px solid #dde3ee; break-inside: avoid; }
  .hero { box-shadow: none; }
}