:root{
  --navy:#3e4c6d;
  --navy-dark:#333f5c;
  --bg:#eef1f6;
  --card:#ffffff;
  --ink:#22283a;
  --sub:#8a90a3;
  --blue:#3d7bfd;
  --blue-soft:#e8efff;
  --green:#2eaa62;
  --red:#e05252;
  --line:#e4e7ef;
  --radius:16px;
}
*{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
html,body{height:100%}
body{
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans JP",sans-serif;
  background:var(--bg);color:var(--ink);
  -webkit-font-smoothing:antialiased;
}
button{font-family:inherit;border:none;background:none;cursor:pointer;color:inherit}
.hidden{display:none!important}
.page{max-width:520px;margin:0 auto;min-height:100vh;background:var(--bg)}

/* ---------- 首页 ---------- */
.hero{background:linear-gradient(160deg,#46557a,#333f5c);color:#fff;padding:34px 20px 26px;border-radius:0 0 24px 24px}
.hero-title{font-size:26px;font-weight:700;letter-spacing:2px}
.hero-sub{margin-top:8px;font-size:13px;opacity:.75}
.wrap{padding:16px}
.sec-label{font-size:13px;color:var(--sub);margin:18px 2px 10px;font-weight:600}
.sec-label:first-child{margin-top:2px}
.mod-row,.mode-row{display:flex;gap:12px}
.mod-row{gap:8px}
.mod-card,.mode-card{
  flex:1;min-width:0;background:var(--card);border-radius:var(--radius);padding:16px 12px;text-align:center;
  border:2px solid transparent;box-shadow:0 2px 8px rgba(40,50,80,.06);transition:.15s;
}
.mod-row .mod-card{padding:14px 6px}
.mod-row .mod-count{font-size:11px;line-height:1.35}
.mod-card.active,.mode-card.active{border-color:var(--blue);background:var(--blue-soft)}
.mod-emoji{width:46px;height:46px;margin:0 auto 8px;border-radius:14px;background:var(--navy);color:#fff;
  font-size:22px;font-weight:700;display:flex;align-items:center;justify-content:center}
.mod-name{font-size:17px;font-weight:700}
.mod-count{font-size:12px;color:var(--sub);margin-top:4px}
.mode-card{text-align:left;padding:14px}
.mode-name{font-size:16px;font-weight:700}
.mode-desc{font-size:12px;color:var(--sub);margin-top:4px;line-height:1.5}
.chips{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  padding:9px 18px;border-radius:999px;background:var(--card);font-size:14px;font-weight:600;color:var(--ink);
  box-shadow:0 1px 4px rgba(40,50,80,.08);transition:.15s;
}
.chip.active{background:var(--blue);color:#fff}
.btn-primary{
  display:block;width:100%;margin-top:24px;padding:15px;border-radius:14px;
  background:var(--blue);color:#fff;font-size:17px;font-weight:700;box-shadow:0 6px 16px rgba(61,123,253,.35);
}
.btn-primary:active{transform:scale(.98)}
.home-tip{margin-top:14px;font-size:12px;color:var(--sub);line-height:1.6}

/* ---------- 顶栏 ---------- */
.topbar{
  background:var(--navy);color:#fff;display:flex;align-items:center;
  padding:10px 12px calc(10px);gap:8px;
}
.icon-btn{font-size:30px;line-height:1;color:#fff;padding:0 6px}
.topbar-title{flex:1;text-align:center;font-size:16px;font-weight:600}
.topbar-home{font-size:14px;color:#fff;opacity:.85;padding:6px 4px}
.progress-row{background:var(--navy);padding:0 16px 12px;display:flex;align-items:center;gap:10px}
.progress-track{flex:1;height:5px;border-radius:3px;background:rgba(255,255,255,.25);overflow:hidden}
.progress-fill{height:100%;width:0;background:#fff;border-radius:3px;transition:width .25s}
.progress-text{font-size:12px;color:#fff;opacity:.9;min-width:52px;text-align:right}

/* ---------- 大卡片 ---------- */
.stage{padding:14px}
.main-card{
  position:relative;background:var(--card);border-radius:20px;padding:20px 16px 16px;
  box-shadow:0 4px 14px rgba(40,50,80,.08);
}
.main-front{text-align:center;padding:6px 0 2px}
.c-head{font-size:34px;font-weight:700;line-height:1.35;word-break:break-word;display:flex;align-items:center;justify-content:center;gap:10px;flex-wrap:wrap}
.c-head .lv{font-size:12px;font-weight:600;color:var(--blue);background:var(--blue-soft);
  border-radius:999px;padding:3px 10px;vertical-align:middle;margin-left:8px}
/* 词条/句型旁的小喇叭 */
.spk-word{
  width:34px;height:34px;border-radius:50%;flex:0 0 auto;
  background:#eef3ff;color:var(--blue);font-size:15px;
  box-shadow:0 2px 6px rgba(61,123,253,.22);display:inline-flex;align-items:center;justify-content:center;
}
.spk-word:active{transform:scale(.9)}
.c-reading{margin-top:6px;font-size:14px;color:var(--sub);letter-spacing:2px}
.c-example{
  margin-top:14px;background:#f5f6fa;border-radius:12px;padding:12px 48px 12px 14px;text-align:center;font-size:15px;line-height:1.7;
  position:relative;
}
/* 例句右侧喇叭 */
.spk-ex{
  position:absolute;right:10px;top:50%;transform:translateY(-50%);
  width:34px;height:34px;border-radius:50%;
  background:#fff;color:var(--blue);font-size:15px;
  box-shadow:0 2px 8px rgba(40,50,80,.15);display:flex;align-items:center;justify-content:center;
}
.spk-ex:active{transform:translateY(-50%) scale(.9)}
.c-example .jp{font-size:15px;color:var(--ink)}
.c-example .rd{font-size:12px;color:var(--sub);margin-top:2px}
.c-example .cn{font-size:13px;color:var(--sub);margin-top:4px}
.c-example .plus{color:var(--blue);font-weight:700}
/* 假名注音（<ruby>） */
.c-example .jp.furi{text-align:left;line-height:2.35;word-break:break-word}
.c-example ruby{ruby-align:center}
.c-example ruby rt{font-size:10px;color:#9aa3b5;font-weight:400;transform:translateY(1px)}
.c-example ruby.plus rt{color:var(--blue)}
.c-conj{margin-top:10px;display:flex;flex-direction:column;gap:6px;align-items:center;font-size:13px;color:var(--sub)}
.c-conj .conj-row{display:flex;flex-wrap:wrap;gap:6px;justify-content:center;align-items:center}
.c-conj .tag{background:var(--blue);color:#fff;border-radius:6px;padding:3px 10px;font-size:12px;font-weight:600}
.c-conj .tag.gray{background:#aeb6c9}
.speak-fab{
  display:none;
}

/* ---------- 开关条 ---------- */
.toggle-bar{
  margin-top:12px;background:var(--card);border-radius:12px;padding:10px 12px;
  display:flex;align-items:center;flex-wrap:wrap;gap:4px 10px;font-size:13px;
  box-shadow:0 2px 8px rgba(40,50,80,.05);
}
.toggle-bar label{display:flex;align-items:center;gap:4px;color:#444}
.toggle-bar input[type=checkbox]{width:16px;height:16px;accent-color:var(--blue)}
.toggle-bar select{margin-left:auto;border:1px solid var(--line);border-radius:8px;padding:4px 8px;font-size:13px;background:#fff}

/* ---------- 测验选项 ---------- */
.quiz-area{margin-top:12px;display:flex;flex-direction:column;gap:10px}
.opt{
  background:var(--card);border-radius:14px;padding:15px;font-size:15px;line-height:1.5;
  box-shadow:0 2px 8px rgba(40,50,80,.06);text-align:center;transition:.12s;border:2px solid transparent;
}
.opt:active{transform:scale(.985)}
.opt.correct{border:2px solid #22a35c;background:#f0faf4;color:#1f9d55;font-weight:700}
.opt.wrong{border:2px solid #f0a8a8;background:#fdf3f3;color:#e08c8c}
.opt.dim{opacity:.55}
.next-wrap{display:flex;justify-content:center;margin-top:2px}
.next-quiz{
  width:100%;padding:14px;border-radius:14px;background:var(--blue);color:#fff;
  font-size:16px;font-weight:700;box-shadow:0 6px 16px rgba(61,123,253,.35);
}
.next-quiz:active{transform:scale(.98)}
.quiz-feedback{font-size:13px;text-align:center;padding:4px 0 0;color:var(--sub)}
.quiz-score{font-size:12px;color:var(--sub);text-align:center;margin-top:2px}

/* ---------- 学习详情 ---------- */
.study-detail{margin-top:12px;display:flex;flex-direction:column;gap:10px}
.d-block{background:var(--card);border-radius:14px;padding:14px;box-shadow:0 2px 8px rgba(40,50,80,.05)}
.d-label{font-size:12px;font-weight:700;color:var(--blue);margin-bottom:6px}
.d-body{font-size:14px;line-height:1.75;white-space:pre-wrap}
.d-body .dim{color:var(--sub)}

/* ---------- 底部导航 ---------- */
.nav-row{display:flex;gap:10px;margin-top:14px}
.btn-nav{
  flex:1;background:var(--card);border-radius:12px;padding:12px 6px;font-size:14px;font-weight:600;
  box-shadow:0 2px 8px rgba(40,50,80,.06);color:var(--navy);
}
.btn-nav:active{transform:scale(.97)}

/* ---------- toast ---------- */
.toast{
  position:fixed;left:50%;bottom:48px;transform:translateX(-50%) translateY(20px);
  background:rgba(30,36,54,.92);color:#fff;font-size:13px;padding:9px 18px;border-radius:999px;
  opacity:0;pointer-events:none;transition:.25s;z-index:99;white-space:nowrap;
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}