/* ============================================================
   小博士学习机 styles.css
   ============================================================ */
:root {
  --bg1: #fef6ff; --bg2: #eef5ff; --bg3: #fff6ec;
  --ink: #2b2350; --ink-soft: #6a6390;
  --card: #ffffff; --line: #ece8ff;
  --brand: #7c5cff; --brand2: #ff6b9d;
  --ok: #2bb673; --no: #ff5a6e;
  --shadow: 0 14px 38px rgba(86, 60, 180, .14);
  --shadow-sm: 0 6px 18px rgba(86, 60, 180, .1);
  font-size: 16px;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
html { overflow-x: hidden; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(900px 500px at 12% -8%, #ffe3f3 0%, transparent 60%),
    radial-gradient(900px 600px at 100% 0%, #dcebff 0%, transparent 55%),
    radial-gradient(700px 500px at 50% 120%, #d6f3ff 0%, transparent 60%),
    linear-gradient(160deg, var(--bg1), var(--bg2) 50%, var(--bg3));
  background-attachment: fixed;
  min-height: 100vh;
  min-height: 100dvh; /* 移动浏览器地址栏伸缩时高度更准 */
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -webkit-text-size-adjust: 100%;
}

/* 漂浮的装饰泡泡 */
body::before, body::after {
  content: ""; position: fixed; border-radius: 50%; filter: blur(2px);
  opacity: .5; pointer-events: none; z-index: 0;
}
body::before { width: 160px; height: 160px; left: -40px; top: 30%;
  background: radial-gradient(circle at 30% 30%, #ffd6ea, #ff9ec9); animation: float 9s ease-in-out infinite; }
body::after { width: 120px; height: 120px; right: -30px; top: 60%;
  background: radial-gradient(circle at 30% 30%, #cfe0ff, #93b6ff); animation: float 11s ease-in-out infinite reverse; }
@keyframes float { 0%,100%{transform:translateY(0)} 50%{transform:translateY(-26px)} }

.app { position: relative; z-index: 1; max-width: 920px; margin: 0 auto; padding: 18px 18px 60px; }

/* ---------- 顶栏 ---------- */
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-bottom: 10px; }
.brand { display: flex; align-items: center; gap: 10px; cursor: pointer; user-select: none; }
.brand-logo { width: 42px; height: 42px; border-radius: 14px;
  background: linear-gradient(135deg, var(--brand), var(--brand2)); display: grid; place-items: center;
  font-size: 24px; box-shadow: var(--shadow-sm); }
.brand-name { font-weight: 800; font-size: 1.25rem; letter-spacing: .5px;
  background: linear-gradient(90deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.brand-sub { font-size: .72rem; color: var(--ink-soft); font-weight: 600; }
.hud { display: flex; gap: 10px; flex-wrap: wrap; justify-content: flex-end; }
.pill { background: var(--card); border-radius: 999px; padding: 8px 14px; font-weight: 800;
  box-shadow: var(--shadow-sm); display: flex; align-items: center; gap: 6px; font-size: .95rem; }
.pill.stars { color: #f5a623; } .pill.streak { color: var(--brand2); }
.pill.quota { color: #1aa67c; }
.pill.quota.low { color: #ff9f1c; }
.pill.quota.empty { color: #ff4d6d; }
.pill.account { color: var(--brand); cursor: pointer; text-decoration: none;
  max-width: 9em; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.pill.account:hover { background: #f1eefe; }
.rank-btn { margin-top: 14px; }
/* 排行榜行 */
.rank-list { width: 100%; border-collapse: collapse; }
.rank-list td { padding: 9px 8px; border-bottom: 1px solid var(--line); font-weight: 700; }
.rank-list td:first-child { width: 48px; text-align: center; font-size: 1.1rem; }
.rank-list td:last-child { text-align: right; color: #f5a623; }
.rank-me { background: #fff7ea; border-radius: 10px; }
.rank-mine-note { text-align: center; color: var(--ink-soft); font-weight: 700; margin-top: 10px; font-size: .9rem; }

/* ---------- 配额用尽：休息卡片 ---------- */
.quota-lock { text-align: center; padding: 40px 24px; }
.quota-lock-emoji { font-size: 64px; line-height: 1; animation: floaty 2.4s ease-in-out infinite; }
.quota-lock-title { margin: 14px 0 8px; }
.quota-lock-text { color: var(--muted, #777); margin: 0 0 6px; }
.quota-lock-reset { font-weight: 800; color: #1aa67c; margin: 6px 0 18px; }
@keyframes floaty { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-8px); } }

/* ---------- 视图通用 ---------- */
.hidden { display: none !important; }
.view { animation: fadeUp .4s ease both; }
@keyframes fadeUp { from{opacity:0; transform:translateY(14px)} to{opacity:1; transform:translateY(0)} }

/* ---------- 首页 Hero ---------- */
.hero { text-align: center; padding: 14px 0 6px; }
.hero-mascot { width: 110px; margin: 0 auto; animation: bob 3s ease-in-out infinite; }
@keyframes bob { 0%,100%{transform:translateY(0) rotate(-2deg)} 50%{transform:translateY(-10px) rotate(2deg)} }
.hero h1 { font-size: clamp(1.6rem, 5vw, 2.4rem); margin: 8px 0 4px; }
.hero h1 b { background: linear-gradient(90deg, var(--brand), var(--brand2)); -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { color: var(--ink-soft); font-weight: 600; }
.section-title { font-size: 1.05rem; font-weight: 800; margin: 22px 4px 14px; display: flex; align-items: center; gap: 8px; }
.section-title::before { content: ""; width: 6px; height: 20px; border-radius: 4px; background: linear-gradient(var(--brand), var(--brand2)); }

/* ---------- 年级卡片 ---------- */
.grade-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 14px; }
.grade-card {
  --c: var(--brand);
  position: relative; border: none; cursor: pointer; text-align: left;
  background: var(--card); border-radius: 22px; padding: 18px 16px;
  box-shadow: var(--shadow-sm); overflow: hidden;
  transition: transform .18s, box-shadow .18s; animation: fadeUp .4s both;
  border: 2px solid transparent;
}
.grade-card::after { content: ""; position: absolute; inset: 0; border-radius: 22px;
  background: linear-gradient(135deg, color-mix(in srgb, var(--c) 16%, white), transparent 55%); opacity: 0; transition: opacity .2s; }
.grade-card:hover { transform: translateY(-6px) scale(1.02); box-shadow: var(--shadow); border-color: color-mix(in srgb, var(--c) 40%, white); }
.grade-card:hover::after { opacity: 1; }
.grade-card:active { transform: translateY(-2px) scale(.99); }
.grade-emoji { font-size: 2.6rem; line-height: 1; }
.grade-name { font-weight: 800; font-size: 1.25rem; margin-top: 8px; color: var(--ink); }
.grade-desc { font-size: .82rem; color: var(--ink-soft); margin-top: 3px; font-weight: 600; }
.grade-mastery { margin-top: 8px; font-size: .72rem; font-weight: 800; color: var(--c);
  background: color-mix(in srgb, var(--c) 14%, white); display: inline-block; padding: 3px 10px; border-radius: 999px; }

/* ---------- 学科卡片 ---------- */
.subhead { display: flex; align-items: center; gap: 12px; margin: 6px 0 4px; }
.btn-ghost { border: none; background: var(--card); box-shadow: var(--shadow-sm); cursor: pointer;
  border-radius: 14px; padding: 10px 16px; font-weight: 800; color: var(--ink); font-size: .92rem; transition: transform .15s; }
.btn-ghost:hover { transform: translateX(-3px); }
.subject-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 16px; margin-top: 8px; }
.subject-card { --c: var(--brand); border: none; cursor: pointer; background: var(--card);
  border-radius: 24px; padding: 26px 18px; text-align: center; box-shadow: var(--shadow-sm);
  transition: transform .18s, box-shadow .18s; animation: fadeUp .4s both; border: 2px solid transparent; }
.subject-card:hover { transform: translateY(-7px) scale(1.03); box-shadow: var(--shadow);
  border-color: color-mix(in srgb, var(--c) 45%, white); background: linear-gradient(160deg, white, color-mix(in srgb, var(--c) 10%, white)); }
.subject-emoji { font-size: 3.2rem; }
.subject-name { font-weight: 800; font-size: 1.2rem; margin-top: 8px; }

/* ---------- 答题页 ---------- */
.quiz-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-bottom: 8px; flex-wrap: wrap; }
.quiz-meta { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }
.tag { background: var(--card); border-radius: 999px; padding: 6px 14px; font-weight: 800; font-size: .85rem; box-shadow: var(--shadow-sm); }
.tag.muted { color: var(--ink-soft); }

.qcard { background: var(--card); border-radius: 28px; padding: 26px 24px; box-shadow: var(--shadow); margin-top: 6px; }
.q-head { display: flex; align-items: flex-start; gap: 14px; }
.mascot-box { width: 70px; flex: 0 0 70px; }
.q-stem { font-size: clamp(1.2rem, 3.4vw, 1.6rem); font-weight: 800; line-height: 1.45; padding-top: 6px; }

.q-art { margin: 18px 0 6px; padding: 18px; border-radius: 20px; text-align: center;
  background: linear-gradient(160deg, #fbf9ff, #f1f6ff); border: 2px dashed var(--line); }
.q-art svg { max-width: 100%; height: auto; max-height: 220px; }

.q-options { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; margin-top: 20px; }
@media (max-width: 520px){ .q-options { grid-template-columns: 1fr; } }
.option-btn { display: flex; align-items: center; gap: 12px; cursor: pointer; text-align: left;
  background: #fbfaff; border: 2px solid var(--line); border-radius: 18px; padding: 16px 16px;
  font-size: 1.15rem; font-weight: 700; color: var(--ink); transition: transform .12s, border-color .15s, background .15s;
  animation: fadeUp .35s both; }
.option-btn:hover:not(.disabled) { transform: translateY(-3px); border-color: var(--brand); background: #fff; box-shadow: var(--shadow-sm); }
.opt-key { width: 34px; height: 34px; flex: 0 0 34px; border-radius: 12px; display: grid; place-items: center;
  background: linear-gradient(135deg, var(--brand), var(--brand2)); color: #fff; font-weight: 800; font-size: 1rem; }
.option-btn.disabled { cursor: default; }
.option-btn.correct { border-color: var(--ok); background: #eafaf1; color: var(--ok); animation: pop .4s; }
.option-btn.correct .opt-key { background: var(--ok); }
.option-btn.wrong { border-color: var(--no); background: #ffeef0; color: var(--no); animation: shake .4s; }
.option-btn.wrong .opt-key { background: var(--no); }
@keyframes pop { 0%{transform:scale(1)} 40%{transform:scale(1.06)} 100%{transform:scale(1)} }
@keyframes shake { 0%,100%{transform:translateX(0)} 25%{transform:translateX(-7px)} 75%{transform:translateX(7px)} }

/* ---------- 反馈 ---------- */
.feedback { margin-top: 18px; border-radius: 18px; padding: 16px 18px; animation: fadeUp .3s both; }
.feedback.ok { background: linear-gradient(135deg, #e6fbf0, #d4f7e6); border: 2px solid #aeebcb; }
.feedback.no { background: linear-gradient(135deg, #fff0f2, #ffe2e6); border: 2px solid #ffc4cc; }
.fb-title { font-size: 1.2rem; font-weight: 800; }
.feedback.ok .fb-title { color: var(--ok); } .feedback.no .fb-title { color: var(--no); }
.fb-explain { margin-top: 6px; color: var(--ink-soft); font-weight: 600; font-size: .98rem; }
.combo { background: var(--brand2); color: #fff; padding: 2px 10px; border-radius: 999px; font-size: .85rem; }

.quiz-actions { display: flex; justify-content: center; margin-top: 22px; }
.btn-primary { border: none; cursor: pointer; font-weight: 800; font-size: 1.1rem; color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand2)); padding: 15px 44px; border-radius: 999px;
  box-shadow: 0 10px 24px rgba(124,92,255,.4); transition: transform .15s, box-shadow .15s; }
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 16px 30px rgba(124,92,255,.5); }
.btn-primary:active { transform: translateY(0); }
.hint { text-align: center; color: var(--ink-soft); font-size: .78rem; margin-top: 14px; font-weight: 600; }

/* ---------- 撒花 ---------- */
#confetti { position: fixed; inset: 0; pointer-events: none; z-index: 50; overflow: hidden; }
.confetti-piece { position: absolute; top: -20px; width: 11px; height: 16px; opacity: .95;
  animation: fall linear forwards; }
@keyframes fall { to { transform: translateY(108vh) rotate(720deg); opacity: .9; } }

.footer { text-align: center; color: var(--ink-soft); font-size: .78rem; margin-top: 30px; font-weight: 600; }

/* ============================================================
   响应式 / 移动端适配
   ============================================================ */

/* 平板及以下：收紧整体留白 */
@media (max-width: 760px) {
  .app { padding: 16px 16px 48px; }
  .grade-grid, .subject-grid { gap: 12px; }
  .qcard { padding: 22px 18px; }
}

/* 手机：核心断点 */
@media (max-width: 560px) {
  :root { font-size: 15px; }
  .app {
    padding: 12px 12px calc(40px + env(safe-area-inset-bottom, 0px));
    padding-left: calc(12px + env(safe-area-inset-left, 0px));
    padding-right: calc(12px + env(safe-area-inset-right, 0px));
  }

  /* 顶栏：缩小品牌与胶囊，保证 三个胶囊 + 标题 一行放得下 */
  .topbar { gap: 8px; margin-bottom: 8px; }
  .brand { gap: 8px; min-width: 0; }
  .brand-logo { width: 36px; height: 36px; border-radius: 12px; font-size: 20px; }
  .brand-name { font-size: 1.02rem; letter-spacing: .2px; white-space: nowrap; }
  .brand-sub { font-size: .64rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
  .hud { gap: 6px; flex-shrink: 0; }
  .pill { padding: 6px 9px; font-size: .78rem; gap: 4px; }

  /* 首页 */
  .hero { padding: 8px 0 4px; }
  .hero-mascot { width: 84px; }
  .hero p { font-size: .9rem; }
  .section-title { margin: 16px 2px 10px; }

  /* 年级 / 学科：固定两列，照顾点按面积 */
  .grade-grid { grid-template-columns: repeat(2, 1fr); gap: 10px; }
  .grade-card { padding: 14px 12px; border-radius: 18px; }
  .grade-emoji { font-size: 2.1rem; }
  .grade-name { font-size: 1.05rem; }
  .subject-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .subject-card { padding: 20px 12px; border-radius: 20px; }
  .subject-emoji { font-size: 2.6rem; }
  .subject-name { font-size: 1.05rem; }

  /* 答题卡 */
  .qcard { padding: 18px 14px; border-radius: 20px; }
  .q-head { gap: 10px; }
  .mascot-box { width: 52px; flex: 0 0 52px; }
  .q-stem { padding-top: 2px; }
  .q-art { padding: 12px; margin: 14px 0 4px; }
  .q-art svg { max-height: 170px; }
  .q-options { gap: 10px; margin-top: 16px; }
  .option-btn { padding: 14px 12px; font-size: 1.05rem; border-radius: 14px; }
  .opt-key { width: 30px; height: 30px; flex: 0 0 30px; border-radius: 10px; }
  .quiz-actions { margin-top: 18px; }
  .btn-primary { width: 100%; padding: 16px; font-size: 1.05rem; }
  .feedback { padding: 14px; }
  .quota-lock { padding: 30px 16px; }
  .quota-lock-emoji { font-size: 52px; }
}

/* 小屏手机：进一步避免溢出 */
@media (max-width: 360px) {
  .pill { padding: 5px 7px; font-size: .72rem; }
  .brand-sub { display: none; }
  .brand-name { font-size: .96rem; }
  .grade-name { font-size: .98rem; }
  .option-btn { font-size: 1rem; }
}

/* 触屏设备：禁用 hover 抬升（否则手指点完会卡在高亮态），改用 active 反馈 */
@media (hover: none) {
  .grade-card:hover, .subject-card:hover,
  .option-btn:hover:not(.disabled),
  .btn-primary:hover, .btn-ghost:hover { transform: none; }
  .grade-card:hover::after { opacity: 0; } /* 不让渐变遮罩点完卡住 */
  .grade-card:active, .subject-card:active,
  .option-btn:active:not(.disabled), .btn-primary:active { transform: scale(.98); }
}

/* 横屏矮屏（如手机横放）：压缩纵向留白 */
@media (max-height: 480px) and (orientation: landscape) {
  .hero-mascot { width: 60px; }
  .hero { padding: 4px 0; }
  .qcard { padding: 16px 18px; }
  .q-options { margin-top: 12px; }
}