/* ===================================================
   泉城小课堂 · 济南市小学二年级学习网站
   设计系统：泉水蓝绿 + 荷花粉，圆角卡片，儿童友好
   =================================================== */

:root {
  --spring: #0f9b8e;          /* 泉水青 */
  --spring-dark: #0b7a70;
  --spring-light: #e6f7f5;
  --lotus: #ef7fa4;           /* 荷花粉 */
  --lotus-light: #fdeaf1;
  --willow: #7cb342;          /* 柳绿 */
  --willow-light: #f1f8e5;
  --sun: #f6a723;             /* 阳光黄 */
  --sun-light: #fff6e3;
  --sky: #2f80ed;
  --sky-light: #eaf2ff;
  --ink: #22303c;
  --ink-2: #4b5c6b;
  --ink-3: #8494a3;
  --line: #e6edf2;
  --bg: #f4f8fa;
  --card: #ffffff;
  --radius-l: 22px;
  --radius-m: 16px;
  --radius-s: 10px;
  --shadow-s: 0 2px 8px rgba(34, 48, 60, .06);
  --shadow-m: 0 8px 24px rgba(34, 48, 60, .08);
  --shadow-l: 0 16px 40px rgba(34, 48, 60, .12);
  --ok: #22a06b;
  --warn: #e8833a;
  --bad: #e14b4b;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: "PingFang SC", "Microsoft YaHei", "Hiragino Sans GB", "Source Han Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }

.wrap { width: min(1160px, 92vw); margin: 0 auto; }

/* ---------------- 顶部导航 ---------------- */
.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, .86);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 18px;
  height: 68px;
}
.brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: .5px; }
.brand-badge {
  width: 38px; height: 38px; border-radius: 12px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, var(--spring), #36c6b6);
  color: #fff; font-size: 20px;
  box-shadow: 0 6px 16px rgba(15, 155, 142, .32);
}
.brand small { display: block; font-size: 11px; font-weight: 500; color: var(--ink-3); letter-spacing: 2px; }
.nav-links { display: flex; gap: 6px; margin-left: auto; flex-wrap: wrap; }
.nav-links a {
  padding: 8px 14px; border-radius: 999px; font-size: 14px; color: var(--ink-2);
  transition: .2s;
}
.nav-links a:hover { background: var(--spring-light); color: var(--spring-dark); }
.nav-links a.active { background: var(--spring); color: #fff; box-shadow: 0 6px 16px rgba(15,155,142,.28); }

/* ---------------- Hero ---------------- */
.hero {
  position: relative;
  overflow: hidden;
  padding: 54px 0 40px;
  background:
    radial-gradient(900px 380px at 12% -10%, #d8f4f0 0%, transparent 60%),
    radial-gradient(700px 340px at 92% 0%, #ffe9f1 0%, transparent 62%),
    #fff;
  border-bottom: 1px solid var(--line);
}
.hero::after {
  content: "";
  position: absolute; inset: auto 0 -1px 0; height: 60px;
  background: radial-gradient(circle at 20px -10px, transparent 20px, #fff 21px) repeat-x;
  background-size: 40px 60px;
  opacity: .9;
}
.hero-grid { display: grid; grid-template-columns: 1.15fr .85fr; gap: 40px; align-items: center; }
.hero h1 { font-size: clamp(30px, 4.4vw, 46px); line-height: 1.24; margin: 12px 0 14px; letter-spacing: -.5px; }
.hero h1 em { font-style: normal; color: var(--spring); }
.hero p.lead { font-size: 16.5px; color: var(--ink-2); margin: 0 0 26px; max-width: 560px; }
.pill {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 15px; border-radius: 999px;
  background: var(--spring-light); color: var(--spring-dark);
  font-size: 13.5px; font-weight: 600;
}
.hero-cta { display: flex; gap: 12px; flex-wrap: wrap; }
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 26px; border-radius: 14px; border: 1px solid transparent;
  font-size: 15px; font-weight: 700; transition: .18s;
  background: #fff; color: var(--ink);
}
.btn-primary { background: linear-gradient(135deg, var(--spring), #34c1b2); color: #fff; box-shadow: 0 10px 24px rgba(15,155,142,.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(15,155,142,.36); }
.btn-ghost { background: #fff; border-color: var(--line); color: var(--ink-2); box-shadow: var(--shadow-s); }
.btn-ghost:hover { border-color: var(--spring); color: var(--spring-dark); }
.btn-sm { padding: 9px 16px; font-size: 13.5px; border-radius: 11px; }

.hero-card {
  background: #fff; border-radius: var(--radius-l); padding: 22px;
  box-shadow: var(--shadow-l); border: 1px solid var(--line);
  transform: rotate(-1.2deg);
}
.hero-card h4 { margin: 0 0 14px; font-size: 14px; color: var(--ink-3); font-weight: 600; letter-spacing: 1px; }
.hero-card .mini-row { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-bottom: 1px dashed var(--line); }
.hero-card .mini-row:last-child { border-bottom: 0; }
.hero-card .mini-ico { width: 34px; height: 34px; border-radius: 10px; display: grid; place-items: center; font-size: 17px; }
.hero-card .mini-row b { font-size: 14.5px; display: block; }
.hero-card .mini-row span { font-size: 12.5px; color: var(--ink-3); }

/* ---------------- 通用标题 ---------------- */
.section { padding: 56px 0; }
.section-head { margin-bottom: 26px; }
.section-head h2 { font-size: 26px; margin: 0 0 6px; letter-spacing: -.3px; }
.section-head p { margin: 0; color: var(--ink-3); font-size: 14.5px; }

/* ---------------- 学科卡片 ---------------- */
.subject-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 22px; }
.subject-card {
  position: relative; overflow: hidden;
  background: #fff; border-radius: var(--radius-l); padding: 28px;
  border: 1px solid var(--line); box-shadow: var(--shadow-m);
  transition: .22s;
}
.subject-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-l); }
.subject-card::before {
  content: ""; position: absolute; right: -50px; top: -60px;
  width: 190px; height: 190px; border-radius: 50%;
  background: var(--accent-soft, var(--spring-light)); opacity: .85;
}
.subject-card .sc-ico {
  position: relative; width: 54px; height: 54px; border-radius: 16px;
  display: grid; place-items: center; font-size: 27px; color: #fff;
  background: var(--accent, var(--spring));
  box-shadow: 0 10px 22px rgba(34,48,60,.18);
}
.subject-card h3 { position: relative; margin: 16px 0 4px; font-size: 21px; }
.subject-card .sc-sub { position: relative; color: var(--ink-3); font-size: 13.5px; margin-bottom: 18px; }
.chip-row { position: relative; display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 20px; }
.chip {
  font-size: 12.5px; padding: 5px 11px; border-radius: 999px;
  background: #f4f8fa; color: var(--ink-2); border: 1px solid var(--line);
}
.subject-card .sc-go {
  position: relative; display: inline-flex; align-items: center; gap: 6px;
  font-size: 14px; font-weight: 700; color: var(--accent, var(--spring));
}

/* ---------------- 功能特性 ---------------- */
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
.feature {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 22px; box-shadow: var(--shadow-s);
}
.feature .f-ico { font-size: 24px; }
.feature h4 { margin: 10px 0 6px; font-size: 16.5px; }
.feature p { margin: 0; font-size: 13.5px; color: var(--ink-3); line-height: 1.65; }

/* ---------------- 统计条 ---------------- */
.stat-bar {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px;
  background: linear-gradient(135deg, #0f9b8e, #2fb8a8);
  border-radius: var(--radius-l); padding: 26px; color: #fff;
  box-shadow: 0 18px 40px rgba(15,155,142,.28);
}
.stat-bar div { text-align: center; }
.stat-bar b { font-size: 28px; display: block; line-height: 1.2; }
.stat-bar span { font-size: 12.5px; opacity: .86; }

/* ---------------- 学科页头部 ---------------- */
.sub-hero {
  padding: 34px 0 20px;
  background: linear-gradient(180deg, #fff, var(--bg));
  border-bottom: 1px solid var(--line);
}
.sub-hero-top { display: flex; align-items: center; gap: 16px; flex-wrap: wrap; }
.sub-hero-top .sc-ico { width: 52px; height: 52px; border-radius: 16px; display: grid; place-items: center; font-size: 26px; color: #fff; }
.sub-hero h1 { font-size: 24px; margin: 0; }
.sub-hero .sub-note { font-size: 13.5px; color: var(--ink-3); }
.term-switch { margin-left: auto; display: flex; gap: 6px; background: #fff; padding: 5px; border-radius: 999px; border: 1px solid var(--line); box-shadow: var(--shadow-s); }
.term-switch button {
  border: 0; background: transparent; padding: 8px 16px; border-radius: 999px;
  font-size: 13.5px; font-weight: 600; color: var(--ink-2);
}
.term-switch button.on { background: var(--spring); color: #fff; }

/* ---------------- 标签页 ---------------- */
.tabs {
  position: sticky; top: 68px; z-index: 40;
  display: flex; gap: 8px; overflow-x: auto;
  padding: 14px 0; margin-bottom: 8px;
  background: linear-gradient(180deg, var(--bg) 70%, rgba(244,248,250,0));
  scrollbar-width: none;
}
.tabs::-webkit-scrollbar { display: none; }
.tabs button {
  flex: 0 0 auto;
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  padding: 10px 18px; border-radius: 999px; font-size: 14px; font-weight: 600;
  box-shadow: var(--shadow-s); transition: .18s; white-space: nowrap;
}
.tabs button:hover { border-color: var(--spring); color: var(--spring-dark); }
.tabs button.on { background: var(--ink); color: #fff; border-color: var(--ink); box-shadow: 0 8px 18px rgba(34,48,60,.22); }

.panel { display: none; padding-bottom: 70px; animation: fade .28s ease; }
.panel.on { display: block; }
@keyframes fade { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

/* ---------------- 单元导航 ---------------- */
.unit-nav { display: flex; gap: 8px; flex-wrap: wrap; margin: 8px 0 22px; }
.unit-nav button {
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  width: 40px; height: 40px; border-radius: 12px; font-weight: 700; font-size: 14px;
  box-shadow: var(--shadow-s); transition: .16s;
}
.unit-nav button:hover { border-color: var(--spring); color: var(--spring-dark); }
.unit-nav button.on { background: var(--spring-light); border-color: var(--spring); color: var(--spring-dark); }
.unit-nav button.done::after {
  content: "✓"; font-size: 10px; display: block; line-height: .6; color: var(--ok);
}

/* ---------------- 卡片 ---------------- */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 24px; box-shadow: var(--shadow-s); margin-bottom: 18px;
}
.card > h3 { margin: 0 0 4px; font-size: 18.5px; display: flex; align-items: center; gap: 9px; }
.card > h3 .dot { width: 9px; height: 9px; border-radius: 50%; background: var(--spring); }
.card .card-sub { color: var(--ink-3); font-size: 13px; margin: 0 0 16px; }

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }

/* 课文列表 */
.lesson-list { display: grid; gap: 10px; }
.lesson-item {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 13px 15px; border-radius: var(--radius-m);
  background: #fbfdfe; border: 1px solid var(--line); transition: .16s;
}
.lesson-item:hover { background: var(--spring-light); border-color: #bfe6e1; }
.lesson-item .li-no {
  flex: 0 0 auto; min-width: 26px; height: 26px; padding: 0 6px; border-radius: 8px;
  background: #fff; border: 1px solid var(--line); color: var(--ink-3);
  font-size: 12px; font-weight: 700; display: grid; place-items: center;
}
.lesson-item .li-body b { font-size: 15px; }
.lesson-item .li-body p { margin: 2px 0 0; font-size: 13px; color: var(--ink-3); }

/* 生字卡 */
.word-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(112px, 1fr)); gap: 12px; }
.word-card {
  border: 1px solid var(--line); border-radius: var(--radius-m); background: #fff;
  padding: 12px 10px 10px; text-align: center; cursor: pointer;
  transition: .18s; position: relative; overflow: hidden;
  box-shadow: var(--shadow-s);
}
.word-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-m); border-color: #bfe6e1; }
.word-card .zi { font-size: 34px; font-weight: 700; line-height: 1.25; letter-spacing: 2px; font-family: "Kaiti SC", "KaiTi", "STKaiti", serif; }
.word-card .py { font-size: 12.5px; color: var(--spring-dark); height: 18px; opacity: 0; transition: .2s; }
.word-card.show .py, .word-card:hover .py { opacity: 1; }
.word-card .bz { font-size: 11.5px; color: var(--ink-3); margin-top: 2px; }
.word-card.show { background: var(--spring-light); border-color: var(--spring); }

/* 要点列表 */
.point-list { margin: 0; padding: 0; list-style: none; display: grid; gap: 10px; }
.point-list li {
  position: relative; padding: 12px 14px 12px 42px; border-radius: var(--radius-m);
  background: #fbfdfe; border: 1px solid var(--line); font-size: 14.2px; color: var(--ink-2);
}
.point-list li::before {
  content: attr(data-i); position: absolute; left: 12px; top: 12px;
  width: 21px; height: 21px; border-radius: 7px; display: grid; place-items: center;
  background: var(--spring-light); color: var(--spring-dark); font-size: 11.5px; font-weight: 800;
}
.point-list li b { color: var(--ink); }

.tag { display: inline-block; padding: 2px 9px; border-radius: 999px; font-size: 11.5px; font-weight: 700; margin-right: 6px; }
.tag-red { background: #fdecec; color: #c93b3b; }
.tag-green { background: var(--willow-light); color: #4f7d1e; }
.tag-blue { background: var(--sky-light); color: #1a5fbf; }
.tag-pink { background: var(--lotus-light); color: #c2567e; }

/* 乘法口诀表 */
.mul-table { display: grid; grid-template-columns: repeat(9, 1fr); gap: 6px; }
.mul-cell {
  aspect-ratio: 1 / 1; border-radius: 10px; border: 1px solid var(--line);
  background: #fff; display: grid; place-items: center; font-size: 12px;
  color: var(--ink-2); cursor: default; transition: .16s; text-align: center; line-height: 1.2; padding: 2px;
}
.mul-cell.empty { background: transparent; border-color: transparent; }
.mul-cell:hover { background: var(--sun-light); border-color: var(--sun); color: #a86b00; transform: scale(1.06); }

/* ---------------- 题目 ---------------- */
.q-toolbar {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  margin-bottom: 16px;
}
.q-toolbar .score {
  margin-left: auto; font-size: 13.5px; color: var(--ink-3);
  background: #fff; border: 1px solid var(--line); padding: 8px 14px; border-radius: 999px;
}
.q-toolbar .score b { color: var(--spring-dark); font-size: 15px; }

.q-item {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-m);
  padding: 18px 20px; margin-bottom: 12px; transition: .2s;
}
.q-item .q-head { display: flex; gap: 10px; font-size: 15px; font-weight: 600; margin-bottom: 12px; }
.q-item .q-no {
  flex: 0 0 auto; width: 24px; height: 24px; border-radius: 8px;
  background: var(--ink); color: #fff; font-size: 12.5px; display: grid; place-items: center;
}
.q-item .q-text { flex: 1; }
.q-opts { display: grid; gap: 9px; }
.q-opt {
  display: flex; align-items: center; gap: 10px;
  border: 1px solid var(--line); border-radius: var(--radius-s);
  padding: 11px 14px; font-size: 14.5px; background: #fbfdfe;
  transition: .16s; cursor: pointer; user-select: none;
}
.q-opt:hover { border-color: var(--spring); background: var(--spring-light); }
.q-opt .k {
  width: 22px; height: 22px; border-radius: 7px; display: grid; place-items: center;
  background: #fff; border: 1px solid var(--line); font-size: 12px; font-weight: 700; color: var(--ink-3);
}
.q-opt.sel { border-color: var(--spring); background: var(--spring-light); }
.q-opt.sel .k { background: var(--spring); border-color: var(--spring); color: #fff; }
.q-opt.right { border-color: var(--ok); background: #eaf8f1; }
.q-opt.right .k { background: var(--ok); border-color: var(--ok); color: #fff; }
.q-opt.wrong { border-color: var(--bad); background: #fdeeee; }
.q-opt.wrong .k { background: var(--bad); border-color: var(--bad); color: #fff; }

.q-fill {
  display: flex; gap: 10px; flex-wrap: wrap; align-items: center;
}
.q-fill input {
  flex: 1 1 180px; padding: 11px 14px; border-radius: var(--radius-s);
  border: 1px solid var(--line); background: #fbfdfe; font-size: 15px; font-family: inherit;
  color: var(--ink); outline: none;
}
.q-fill input:focus { border-color: var(--spring); background: #fff; box-shadow: 0 0 0 3px rgba(15,155,142,.12); }
.q-fill input.right { border-color: var(--ok); background: #eaf8f1; }
.q-fill input.wrong { border-color: var(--bad); background: #fdeeee; }

.q-feedback {
  margin-top: 12px; padding: 11px 14px; border-radius: var(--radius-s);
  font-size: 13.5px; display: none; line-height: 1.65;
}
.q-feedback.show { display: block; }
.q-feedback.ok { background: #eaf8f1; color: #14764d; border: 1px solid #bfe8d5; }
.q-feedback.no { background: #fdeeee; color: #b03a3a; border: 1px solid #f6cdcd; }
.q-feedback b { font-weight: 800; }

.empty-tip {
  text-align: center; padding: 50px 20px; color: var(--ink-3); font-size: 14.5px;
  background: #fff; border: 1px dashed var(--line); border-radius: var(--radius-l);
}
.empty-tip .ico { font-size: 40px; display: block; margin-bottom: 10px; }

/* 错题本 */
.wrong-item {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--lotus);
  border-radius: var(--radius-m); padding: 16px 18px; margin-bottom: 12px;
}
.wrong-item .w-meta { font-size: 12px; color: var(--ink-3); margin-bottom: 6px; }
.wrong-item .w-q { font-size: 14.5px; font-weight: 600; margin-bottom: 8px; }
.wrong-item .w-line { font-size: 13.5px; color: var(--ink-2); }
.wrong-item .w-line b { color: var(--ok); }
.wrong-item .w-line i { color: var(--bad); font-style: normal; }

/* 进度环 */
.progress-row { display: flex; align-items: center; gap: 10px; margin-bottom: 12px; }
.progress-row .p-label { font-size: 13.5px; color: var(--ink-2); min-width: 92px; }
.bar { flex: 1; height: 9px; border-radius: 999px; background: #eef3f6; overflow: hidden; }
.bar > i { display: block; height: 100%; border-radius: 999px; background: linear-gradient(90deg, var(--spring), #43cbbc); transition: width .5s ease; }
.progress-row .p-val { font-size: 12.5px; color: var(--ink-3); min-width: 44px; text-align: right; }

/* 页脚 */
footer {
  padding: 34px 0 40px; border-top: 1px solid var(--line);
  background: #fff; color: var(--ink-3); font-size: 13px;
}
footer .foot-inner { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }
footer b { color: var(--ink-2); }

/* ===================================================
   学习小工具（tools.html）
   =================================================== */
.tool-tabs { display: flex; gap: 10px; flex-wrap: wrap; margin: 4px 0 22px; }
.tool-tabs button {
  display: flex; align-items: center; gap: 8px;
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  padding: 12px 20px; border-radius: 14px; font-size: 14.5px; font-weight: 700;
  box-shadow: var(--shadow-s); transition: .18s;
}
.tool-tabs button:hover { border-color: var(--spring); color: var(--spring-dark); }
.tool-tabs button.on { background: var(--ink); border-color: var(--ink); color: #fff; box-shadow: 0 10px 22px rgba(34,48,60,.22); }

.tool-panel { display: none; }
.tool-panel.on { display: block; animation: fade .28s ease; }

.tool-stage {
  background:
    radial-gradient(600px 260px at 8% 0%, #e6f7f5 0%, transparent 60%),
    radial-gradient(520px 240px at 96% 10%, #eaf2ff 0%, transparent 62%),
    #fff;
  border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 30px; box-shadow: var(--shadow-m); text-align: center;
}
.tool-stage .ts-label { font-size: 13px; color: var(--ink-3); letter-spacing: 1px; }
.big-q {
  font-size: clamp(40px, 9vw, 64px); font-weight: 800; letter-spacing: 3px;
  margin: 14px 0 6px; color: var(--ink); line-height: 1.2;
  font-variant-numeric: tabular-nums;
}
.big-q small { font-size: .5em; color: var(--ink-3); font-weight: 600; letter-spacing: 1px; }
.answer-row { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
.answer-row input {
  width: 190px; text-align: center; font-size: 26px; font-weight: 800;
  padding: 12px 16px; border-radius: 14px; border: 2px solid var(--line);
  background: #fff; outline: none; font-family: inherit; color: var(--ink);
}
.answer-row input:focus { border-color: var(--spring); box-shadow: 0 0 0 4px rgba(15,155,142,.12); }
.answer-row input.right { border-color: var(--ok); background: #eaf8f1; }
.answer-row input.wrong { border-color: var(--bad); background: #fdeeee; }

.tool-stat {
  display: flex; gap: 18px; justify-content: center; flex-wrap: wrap;
  margin-top: 22px; padding-top: 20px; border-top: 1px dashed var(--line);
}
.tool-stat div { min-width: 96px; }
.tool-stat b { display: block; font-size: 24px; line-height: 1.2; font-variant-numeric: tabular-nums; }
.tool-stat span { font-size: 12px; color: var(--ink-3); }
.tool-stat .s-ok b { color: var(--ok); }
.tool-stat .s-no b { color: var(--bad); }
.tool-stat .s-t b { color: var(--spring-dark); }

.tool-hint { font-size: 13.5px; color: var(--ink-3); margin-top: 14px; min-height: 22px; }

.keypad { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; max-width: 320px; margin: 18px auto 0; }
.keypad button {
  border: 1px solid var(--line); background: #fff; border-radius: 14px;
  padding: 14px 0; font-size: 20px; font-weight: 700; color: var(--ink);
  box-shadow: var(--shadow-s); transition: .14s;
}
.keypad button:hover { border-color: var(--spring); background: var(--spring-light); color: var(--spring-dark); }
.keypad button:active { transform: scale(.96); }

.clock-wrap { display: flex; justify-content: center; margin: 10px 0 4px; }
.clock-svg { width: min(300px, 74vw); height: auto; }

/* 钟面输入 */
.time-inputs { display: flex; gap: 10px; justify-content: center; align-items: center; flex-wrap: wrap; margin-top: 16px; }
.time-inputs input {
  width: 90px; text-align: center; font-size: 22px; font-weight: 800;
  padding: 10px; border-radius: 12px; border: 2px solid var(--line); outline: none;
  font-family: inherit; color: var(--ink);
}
.time-inputs input:focus { border-color: var(--spring); }
.time-inputs span { font-size: 18px; font-weight: 700; color: var(--ink-2); }

/* ===================================================
   模拟卷（exam.html）
   =================================================== */
.paper-head {
  display: flex; align-items: center; gap: 14px; flex-wrap: wrap;
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-l);
  padding: 18px 22px; box-shadow: var(--shadow-s); margin-bottom: 18px;
  position: sticky; top: 68px; z-index: 30;
}
.paper-head .ph-title { font-size: 17px; font-weight: 800; }
.paper-head .ph-sub { font-size: 12.5px; color: var(--ink-3); }
.paper-head .ph-right { margin-left: auto; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.timer-pill {
  font-size: 15px; font-weight: 800; color: var(--sky); background: var(--sky-light);
  border-radius: 999px; padding: 8px 16px; font-variant-numeric: tabular-nums;
}
.timer-pill.warn { color: #b03a3a; background: #fdeeee; }

.setup-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.setup-cell { background: #fbfdfe; border: 1px solid var(--line); border-radius: var(--radius-m); padding: 16px; }
.setup-cell h4 { margin: 0 0 10px; font-size: 14px; color: var(--ink-2); }
.opt-row { display: flex; gap: 8px; flex-wrap: wrap; }
.opt-row button {
  border: 1px solid var(--line); background: #fff; color: var(--ink-2);
  padding: 9px 16px; border-radius: 999px; font-size: 13.5px; font-weight: 600; transition: .16s;
}
.opt-row button.on { background: var(--spring); border-color: var(--spring); color: #fff; }

.result-hero {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  background: linear-gradient(135deg, #0f9b8e, #2fb8a8); color: #fff;
  border-radius: var(--radius-l); padding: 26px; margin-bottom: 18px;
  box-shadow: 0 18px 40px rgba(15,155,142,.26);
}
.result-hero .rh-score { font-size: 46px; font-weight: 800; line-height: 1; font-variant-numeric: tabular-nums; }
.result-hero .rh-score small { font-size: 16px; font-weight: 600; opacity: .8; }
.result-hero .rh-info { font-size: 13.5px; opacity: .92; line-height: 1.8; }
.q-item.j-right { border-color: #bfe8d5; }
.q-item.j-wrong { border-color: #f6cdcd; }
.q-mark { font-size: 12.5px; font-weight: 800; padding: 2px 10px; border-radius: 999px; }
.q-mark.ok { background: #eaf8f1; color: #14764d; }
.q-mark.no { background: #fdeeee; color: #b03a3a; }

/* ===================================================
   错题复习卡
   =================================================== */
.flash-card {
  background: #fff; border: 1px solid var(--line); border-left: 4px solid var(--lotus);
  border-radius: var(--radius-m); padding: 18px 20px; margin-bottom: 12px;
}
.flash-card .fc-meta { font-size: 12px; color: var(--ink-3); margin-bottom: 8px; }
.flash-card .fc-q { font-size: 15px; font-weight: 600; margin-bottom: 12px; }
.flash-card .fc-answer {
  background: #fbfdfe; border: 1px dashed var(--line); border-radius: var(--radius-s);
  padding: 12px 14px; font-size: 14px; color: var(--ink-2); display: none;
}
.flash-card.reveal .fc-answer { display: block; }
.flash-card .fc-actions { display: flex; gap: 10px; margin-top: 12px; flex-wrap: wrap; }
.flash-card.gone { display: none; }

/* ===================================================
   打印（练习卷 / 模拟卷）
   =================================================== */
@media print {
  .nav, .tabs, .unit-nav, footer, .term-switch, .tool-tabs, .paper-head .ph-right,
  .btn, #btnClear, .q-toolbar { display: none !important; }
  body { background: #fff; }
  .panel, .tool-panel { display: block !important; }
  .card, .q-item, .paper-head { box-shadow: none; border-color: #ccc; break-inside: avoid; }
  .q-feedback { display: block !important; }
}

/* ---------------- 响应式 ---------------- */
@media (max-width: 900px) {
  .setup-grid { grid-template-columns: 1fr; }
  .paper-head { position: static; }
  .hero-grid { grid-template-columns: 1fr; gap: 26px; }
  .hero-card { transform: none; }
  .subject-grid { grid-template-columns: 1fr; }
  .feature-grid { grid-template-columns: 1fr 1fr; }
  .stat-bar { grid-template-columns: 1fr 1fr; gap: 22px; }
  .grid-2 { grid-template-columns: 1fr; }
  .tabs { top: 64px; }
  .nav-inner { height: 62px; }
  .nav-links a { padding: 7px 10px; font-size: 13px; }
}
@media (max-width: 560px) {
  .feature-grid { grid-template-columns: 1fr; }
  .mul-table { gap: 3px; }
  .mul-cell { font-size: 9px; border-radius: 6px; }
  .brand small { display: none; }
  .card { padding: 18px; }
  .hero { padding: 36px 0 30px; }
}