/* ============================================================
   拾级英语 · 专四入门学习站 — 简洁高级风
   ============================================================ */
:root{
  --paper:#F5F3EE;
  --card:#FFFFFF;
  --ink:#211F1B;
  --sub:#6F6A5F;
  --line:#E5E0D4;
  --line-soft:#EFEBE1;
  --green:#1E5C4F;
  --green-dark:#143E35;
  --green-soft:#EAF1EE;
  --gold:#B8892F;
  --gold-soft:#F6EFDC;
  --red:#B4553F;
  --red-soft:#F9ECE7;
  --shadow:0 1px 2px rgba(33,31,27,.04), 0 8px 28px rgba(33,31,27,.06);
  --shadow-lg:0 2px 4px rgba(33,31,27,.05), 0 18px 48px rgba(33,31,27,.10);
  --serif:'Noto Serif SC',Georgia,'Times New Roman',serif;
  --sans:'Noto Sans SC',-apple-system,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;
  --radius:14px;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  font-family:var(--sans);
  background:var(--paper);
  color:var(--ink);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
.bg-grain{
  position:fixed;inset:0;pointer-events:none;z-index:0;opacity:.5;
  background-image:radial-gradient(rgba(33,31,27,.035) 1px, transparent 1px);
  background-size:22px 22px;
}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px;position:relative;z-index:1}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
::selection{background:var(--green);color:#fff}

/* ---------- 顶栏 ---------- */
.topbar{
  position:sticky;top:0;z-index:50;
  background:rgba(245,243,238,.86);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line-soft);
}
.topbar-inner{display:flex;align-items:center;justify-content:space-between;height:66px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand-mark{
  width:38px;height:38px;border-radius:50%;
  background:var(--green);color:#F6F4EF;
  font-family:var(--serif);font-size:20px;font-weight:600;
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 4px 12px rgba(30,92,79,.28);
}
.brand-mark.small{width:28px;height:28px;font-size:14px;box-shadow:none}
.brand-text{font-family:var(--serif);font-weight:700;font-size:18px;letter-spacing:.5px;line-height:1.2;display:flex;flex-direction:column}
.brand-text em{font-style:normal;font-size:10.5px;color:var(--sub);letter-spacing:2px;font-family:var(--sans)}
.nav{display:flex;align-items:center;gap:2px;overflow-x:auto;scrollbar-width:none}
.nav::-webkit-scrollbar{display:none}
.nav a{
  padding:7px 12px;border-radius:999px;font-size:14px;color:var(--sub);
  white-space:nowrap;transition:all .18s ease;
}
.nav a:hover{color:var(--ink);background:var(--line-soft)}
.nav a.active{color:#fff;background:var(--green)}
.nav a.nav-em{color:var(--gold);font-weight:600}
.nav a.nav-em.active{color:#fff;background:var(--gold)}

main{min-height:calc(100vh - 160px);padding:36px 0 72px}

/* ---------- 通用 ---------- */
.card{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.section-head{margin:8px 0 22px}
.section-head .eyebrow{
  font-size:12px;letter-spacing:3px;color:var(--gold);font-weight:600;
  text-transform:uppercase;margin-bottom:6px;
}
.section-head h1{font-family:var(--serif);font-size:32px;font-weight:700;letter-spacing:.5px}
.section-head p{color:var(--sub);margin-top:6px;max-width:640px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  border:1px solid transparent;border-radius:999px;
  padding:11px 26px;font-size:15px;font-weight:500;
  transition:all .18s ease;user-select:none;
}
.btn:active{transform:translateY(1px)}
.btn-primary{background:var(--green);color:#fff}
.btn-primary:hover{background:var(--green-dark);box-shadow:0 8px 20px rgba(30,92,79,.25)}
.btn-gold{background:var(--gold);color:#fff}
.btn-gold:hover{filter:brightness(1.06);box-shadow:0 8px 20px rgba(184,137,47,.3)}
.btn-ghost{background:transparent;border-color:var(--line);color:var(--ink)}
.btn-ghost:hover{border-color:var(--green);color:var(--green)}
.btn-sm{padding:7px 18px;font-size:13.5px}
.btn[disabled]{opacity:.45;pointer-events:none}
.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 14px;border-radius:999px;font-size:12.5px;
  background:var(--green-soft);color:var(--green);font-weight:500;
}
.chip.gold{background:var(--gold-soft);color:#8a6516}
.chip.red{background:var(--red-soft);color:var(--red)}
.divider{height:1px;background:var(--line-soft);margin:28px 0;border:none}
.empty{
  text-align:center;color:var(--sub);padding:64px 24px;
  border:1.5px dashed var(--line);border-radius:var(--radius);
}
.empty .big{font-family:var(--serif);font-size:22px;color:var(--ink);margin-bottom:8px}

/* ---------- 首页 ---------- */
.hero{padding:44px 0 12px;display:flex;flex-direction:column;align-items:center;text-align:center}
.hero .kicker{font-size:13px;letter-spacing:4px;color:var(--gold);font-weight:600;margin-bottom:16px}
.hero h1{
  font-family:var(--serif);font-size:clamp(34px,5.4vw,52px);font-weight:700;
  line-height:1.28;letter-spacing:1px;
}
.hero h1 .ink-green{color:var(--green)}
.hero .sub{margin-top:18px;color:var(--sub);max-width:560px;font-size:16.5px}
.hero .hero-actions{margin-top:30px;display:flex;gap:14px;flex-wrap:wrap;justify-content:center}
.hero .quote{
  margin-top:36px;font-family:var(--serif);color:var(--sub);font-size:15px;
  padding:14px 26px;border-left:3px solid var(--gold);background:var(--card);
  border-radius:0 var(--radius) var(--radius) 0;text-align:left;box-shadow:var(--shadow);
}
.hero .quote b{display:block;font-size:12px;color:var(--gold);letter-spacing:2px;margin-bottom:4px;font-family:var(--sans)}

.checkin-band{
  margin-top:44px;display:flex;align-items:center;justify-content:space-between;gap:20px;
  background:linear-gradient(120deg,var(--green),#27705F);
  color:#fff;border-radius:var(--radius);padding:26px 32px;box-shadow:var(--shadow-lg);
  flex-wrap:wrap;
}
.checkin-band h3{font-family:var(--serif);font-size:20px;font-weight:600}
.checkin-band p{opacity:.85;font-size:14px;margin-top:4px}
.checkin-band .streak-num{font-family:var(--serif);font-size:40px;font-weight:700;line-height:1}
.checkin-band .right{display:flex;align-items:center;gap:26px}
.checkin-band .btn{background:#fff;color:var(--green-dark);font-weight:600}
.checkin-band .btn[disabled]{background:rgba(255,255,255,.18);color:rgba(255,255,255,.85)}

.stat-row{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-top:24px}
.stat-cell{padding:20px 22px;text-align:left}
.stat-cell .num{font-family:var(--serif);font-size:30px;font-weight:700;color:var(--green)}
.stat-cell .num.gold{color:var(--gold)}
.stat-cell .lbl{font-size:13px;color:var(--sub);margin-top:2px}

.modules{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:26px}
.module-card{
  display:flex;flex-direction:column;gap:10px;padding:26px 24px;cursor:pointer;
  transition:all .22s ease;position:relative;overflow:hidden;
}
.module-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg);border-color:var(--green)}
.module-card .m-ico{
  width:46px;height:46px;border-radius:12px;font-family:var(--serif);font-size:22px;font-weight:700;
  display:flex;align-items:center;justify-content:center;
  background:var(--green-soft);color:var(--green);
}
.module-card.gold .m-ico{background:var(--gold-soft);color:#8a6516}
.module-card h3{font-family:var(--serif);font-size:19px;font-weight:600}
.module-card p{font-size:13.5px;color:var(--sub);line-height:1.7}
.module-card .m-meta{font-size:12px;color:var(--gold);margin-top:auto;letter-spacing:1px}

/* ---------- 练习通用 ---------- */
.practice-shell{display:grid;grid-template-columns:1fr;gap:20px}
.progress-bar{height:6px;border-radius:99px;background:var(--line-soft);overflow:hidden;margin:10px 0 4px}
.progress-bar i{display:block;height:100%;background:var(--green);border-radius:99px;transition:width .35s ease}
.progress-bar.gold i{background:var(--gold)}
.q-meta{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:var(--sub);margin-bottom:10px}
.q-text{font-size:18.5px;font-weight:500;line-height:1.8}
.q-text.serif{font-family:var(--serif)}
.opts{display:flex;flex-direction:column;gap:10px;margin-top:20px}
.opt{
  display:flex;align-items:flex-start;gap:12px;
  border:1.5px solid var(--line);border-radius:12px;padding:13px 18px;
  background:#fff;cursor:pointer;transition:all .15s ease;font-size:15.5px;text-align:left;width:100%;
}
.opt:hover{border-color:var(--green);background:var(--green-soft)}
.opt .key{
  flex-shrink:0;width:24px;height:24px;border-radius:50%;border:1.5px solid var(--line);
  font-size:12px;font-weight:600;display:flex;align-items:center;justify-content:center;color:var(--sub);
  margin-top:2px;transition:all .15s ease;
}
.opt.selected{border-color:var(--green);background:var(--green-soft)}
.opt.selected .key{background:var(--green);border-color:var(--green);color:#fff}
.opt.correct{border-color:var(--green);background:var(--green-soft);color:var(--green-dark);font-weight:500}
.opt.correct .key{background:var(--green);border-color:var(--green);color:#fff}
.opt.wrong{border-color:var(--red);background:var(--red-soft);color:#8f3f2c}
.opt.wrong .key{background:var(--red);border-color:var(--red);color:#fff}
.opt.disabled{pointer-events:none}
.explain{
  margin-top:18px;padding:16px 20px;border-radius:12px;font-size:14.5px;line-height:1.8;
  background:var(--gold-soft);border-left:3px solid var(--gold);color:#5c4a1e;
}
.explain.ok{background:var(--green-soft);border-left-color:var(--green);color:var(--green-dark)}
.explain.bad{background:var(--red-soft);border-left-color:var(--red);color:#8f3f2c}
.explain b{display:block;margin-bottom:4px;font-size:13px;letter-spacing:1px}
.pager{display:flex;justify-content:space-between;align-items:center;margin-top:24px}

/* ---------- 词汇 ---------- */
.vocab-top{display:flex;justify-content:space-between;align-items:flex-end;flex-wrap:wrap;gap:16px;margin-bottom:20px}
.vocab-stats{display:flex;gap:12px;flex-wrap:wrap}
.flip-card{perspective:1200px;cursor:pointer;min-height:380px}
.flip-inner{
  position:relative;width:100%;min-height:380px;transition:transform .55s cubic-bezier(.4,.1,.2,1);
  transform-style:preserve-3d;
}
.flip-card.flipped .flip-inner{transform:rotateY(180deg)}
.flip-face{
  position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;
  border-radius:var(--radius);border:1px solid var(--line);background:var(--card);
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:14px;
  padding:36px;text-align:center;box-shadow:var(--shadow);
}
.flip-face.back{transform:rotateY(180deg);background:linear-gradient(160deg,#fff,var(--green-soft))}
.flip-word{font-family:var(--serif);font-size:44px;font-weight:700;letter-spacing:1px}
.flip-ph{color:var(--sub);font-size:17px}
.flip-hint{font-size:12.5px;color:var(--gold);letter-spacing:2px;margin-top:10px}
.flip-cn{font-size:22px;font-weight:600;color:var(--green-dark)}
.flip-ex{font-size:15px;color:var(--ink);max-width:460px;line-height:1.9}
.flip-ex span{display:block;color:var(--sub);font-size:13.5px;margin-top:6px}
.mastery{display:flex;gap:5px}
.mastery i{width:26px;height:5px;border-radius:99px;background:var(--line-soft)}
.mastery i.on{background:var(--gold)}

/* ---------- 阅读 ---------- */
.passage{
  padding:32px 36px;font-size:16px;line-height:2.05;text-align:justify;
  white-space:pre-line;font-family:var(--serif);
}
.passage-title{font-family:var(--serif);font-size:20px;font-weight:600;padding:24px 36px 0}
.passage-hint{padding:0 36px;color:var(--sub);font-size:13px;margin-top:8px}
.reading-q{padding:24px 36px;border-top:1px solid var(--line-soft)}
.reading-q .q-text{font-size:16px}

/* ---------- 完形 ---------- */
.cloze-passage{padding:32px 36px;line-height:2.2;font-size:16px;text-align:justify}
.blank-tag{
  display:inline-flex;align-items:center;justify-content:center;
  min-width:34px;height:24px;padding:0 8px;border-radius:7px;margin:0 3px;
  background:var(--gold-soft);color:#8a6516;font-size:12.5px;font-weight:700;cursor:pointer;
  border:1px dashed var(--gold);transition:all .15s;vertical-align:baseline;
}
.blank-tag:hover{background:var(--gold);color:#fff}
.blank-tag.ok{background:var(--green);border:1px solid var(--green);color:#fff}
.blank-tag.bad{background:var(--red);border:1px solid var(--red);color:#fff}
.blank-editor{
  margin-top:20px;padding:18px 22px;border-radius:12px;background:var(--green-soft);
  display:flex;align-items:center;gap:14px;flex-wrap:wrap;
}
.blank-editor b{font-family:var(--serif);font-size:18px;color:var(--green-dark)}
.blank-editor .opts{margin-top:0;display:flex;gap:10px;flex-wrap:wrap}
.blank-editor .opt{width:auto;padding:8px 18px;border-radius:999px}

/* ---------- 听写 ---------- */
.dict-card{padding:40px;text-align:center}
.dict-cn{font-family:var(--serif);font-size:24px;margin:14px 0 26px;color:var(--ink)}
.dict-input{
  width:100%;max-width:640px;padding:14px 20px;font-size:16.5px;font-family:var(--sans);
  border:1.5px solid var(--line);border-radius:12px;background:#fff;outline:none;transition:border .15s;
}
.dict-input:focus{border-color:var(--green)}
.dict-result{margin-top:22px;font-size:15px}
.dict-ref{font-family:var(--serif);font-size:18px;color:var(--green-dark);margin-top:8px}
.dict-score{font-size:13px;color:var(--sub);margin-top:6px}

/* ---------- 写作 ---------- */
.writing-grid{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.w-card{padding:26px 28px}
.w-card h3{font-family:var(--serif);font-size:18px;font-weight:600;margin-bottom:14px;display:flex;align-items:center;gap:10px}
.w-card h3 .dot{width:8px;height:8px;border-radius:50%;background:var(--gold)}
.tip-item{padding:13px 0;border-bottom:1px dashed var(--line-soft);font-size:14.5px;color:#4a463d;line-height:1.85}
.tip-item:last-child{border-bottom:none}
.pat-group{margin-bottom:18px}
.pat-group .cat{font-size:13px;font-weight:600;color:var(--gold);letter-spacing:2px;margin-bottom:8px}
.pat-item{
  font-size:14px;padding:9px 14px;border-radius:9px;background:var(--line-soft);margin-bottom:7px;
  font-family:Georgia,var(--serif);color:#403c34;display:flex;justify-content:space-between;gap:10px;align-items:center;
}
.pat-item button{border:none;background:none;color:var(--sub);font-size:12px;flex-shrink:0}
.pat-item button:hover{color:var(--green)}
.sample-box{padding:32px 38px;margin-top:18px}
.sample-box h3{font-family:var(--serif);font-size:20px;text-align:center;margin-bottom:18px}
.sample-box p{font-family:var(--serif);line-height:2.1;margin-bottom:14px;text-align:justify;font-size:15.5px}

/* ---------- 真题模拟（试卷风） ---------- */
.exam-gate{padding:44px;text-align:center}
.exam-gate h2{font-family:var(--serif);font-size:26px;margin-bottom:10px}
.exam-gate p{color:var(--sub);max-width:520px;margin:0 auto 8px}
.exam-gate .paper-map{display:flex;gap:12px;justify-content:center;flex-wrap:wrap;margin:26px 0}
.exam-gate .paper-map .chip{padding:8px 18px;font-size:13.5px}
.timer-float{
  position:fixed;top:80px;right:26px;z-index:40;
  background:var(--ink);color:#F6F4EF;border-radius:999px;padding:10px 22px;
  font-family:var(--serif);font-size:18px;letter-spacing:2px;box-shadow:var(--shadow-lg);
}
.timer-float.warn{background:var(--red);animation:pulse 1.2s infinite}
@keyframes pulse{50%{transform:scale(1.05)}}
.paper-sheet{
  background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);
  max-width:880px;margin:0 auto;padding:56px 64px;font-family:var(--serif);
}
.paper-head{text-align:center;margin-bottom:8px}
.paper-head .secret{font-size:13px;letter-spacing:3px;color:#8a8578;margin-bottom:14px}
.paper-head h1{font-size:26px;letter-spacing:2px;font-weight:700}
.paper-head .en{font-size:14px;color:var(--sub);letter-spacing:1px;margin-top:4px}
.paper-info{
  display:flex;justify-content:center;gap:32px;margin:20px 0;font-size:14px;color:#4a463d;
  border-top:1.5px solid var(--ink);border-bottom:1px solid var(--line);padding:10px 0;
}
.paper-note{
  font-size:13px;color:#6b665a;background:var(--paper);border:1px solid var(--line);
  padding:12px 18px;border-radius:8px;margin-bottom:34px;line-height:1.9;
}
.paper-part{font-size:16px;font-weight:700;letter-spacing:2px;margin:36px 0 6px;display:flex;justify-content:space-between;border-bottom:1.5px solid var(--ink);padding-bottom:6px}
.paper-part small{font-weight:400;color:var(--sub);letter-spacing:0}
.paper-q{margin:24px 0;font-size:15.5px;line-height:2}
.paper-q .stem{margin-bottom:8px}
.paper-opts{display:flex;flex-wrap:wrap;gap:6px 26px;padding-left:4px}
.paper-opts label{display:flex;gap:7px;align-items:flex-start;cursor:pointer;font-size:15px;min-width:200px}
.paper-opts input{margin-top:7px;accent-color:var(--green)}
.paper-sheet .cloze-passage{padding:16px 4px;font-family:var(--serif)}
.paper-writing{line-height:2.2;font-size:15.5px}
.paper-writing .lines{margin-top:14px}
.paper-writing .line{border-bottom:1px solid var(--line);height:38px}
.paper-actions{text-align:center;margin-top:40px;display:flex;justify-content:center;gap:14px;flex-wrap:wrap}
.paper-result{
  max-width:880px;margin:0 auto 22px;padding:26px 34px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap;
}
.paper-result .score{font-family:var(--serif);font-size:40px;font-weight:700;color:var(--green)}
.paper-result .score small{font-size:16px;color:var(--sub);font-weight:400}
.review-block{margin-top:8px}
.review-item{padding:16px 22px;border-top:1px dashed var(--line-soft);font-size:14.5px}
.review-item .r-head{display:flex;gap:10px;align-items:center;margin-bottom:6px}
.review-item .r-ans{color:var(--sub)}
.review-item.ok .r-head b{color:var(--green)}
.review-item.bad .r-head b{color:var(--red)}

/* ---------- 错题本 / 统计 ---------- */
.mistake-item{padding:22px 26px;margin-bottom:14px}
.mistake-item .m-tag{font-size:12px;color:var(--gold);letter-spacing:1px}
.mistake-item .m-q{font-size:16px;margin:8px 0}
.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.bar-row{display:flex;align-items:center;gap:14px;margin:13px 0;font-size:14px}
.bar-row .lbl{width:86px;color:var(--sub);flex-shrink:0;text-align:right}
.bar-row .track{flex:1;height:10px;border-radius:99px;background:var(--line-soft);overflow:hidden}
.bar-row .track i{display:block;height:100%;background:linear-gradient(90deg,var(--green),#2c8271);border-radius:99px}
.bar-row .val{width:70px;color:var(--ink);font-weight:500}
.week-grid{display:flex;gap:10px;margin-top:16px;flex-wrap:wrap}
.week-cell{
  flex:1;min-width:56px;text-align:center;padding:14px 6px;border-radius:12px;
  background:var(--line-soft);font-size:12.5px;color:var(--sub);
}
.week-cell .n{font-family:var(--serif);font-size:20px;font-weight:700;color:var(--ink);display:block}
.week-cell.hot{background:var(--green);color:rgba(255,255,255,.85)}
.week-cell.hot .n{color:#fff}

/* ---------- 弹窗 / Toast ---------- */
.modal-mask{
  position:fixed;inset:0;background:rgba(33,31,27,.42);z-index:90;
  display:flex;align-items:center;justify-content:center;backdrop-filter:blur(4px);
}
.modal{
  width:min(420px,calc(100vw - 40px));background:#fff;border-radius:18px;padding:40px 36px;
  box-shadow:var(--shadow-lg);text-align:center;
}
.modal h2{font-family:var(--serif);font-size:24px;margin-bottom:8px}
.modal p{color:var(--sub);font-size:14px;margin-bottom:22px}
.modal input{
  width:100%;padding:13px 18px;border:1.5px solid var(--line);border-radius:12px;
  font-size:16px;outline:none;text-align:center;margin-bottom:18px;font-family:inherit;
}
.modal input:focus{border-color:var(--green)}
.toast{
  position:fixed;bottom:34px;left:50%;transform:translateX(-50%) translateY(20px);
  background:var(--ink);color:#F6F4EF;padding:12px 26px;border-radius:999px;
  font-size:14px;opacity:0;pointer-events:none;transition:all .3s ease;z-index:99;box-shadow:var(--shadow-lg);
}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ---------- v2 新增：动效 / 朗读 / 音效 / 试卷列表 ---------- */
@keyframes fadeUp{from{opacity:0;transform:translateY(18px)}to{opacity:1;transform:none}}
.hero{position:relative}
.hero-canvas{position:absolute;inset:0;pointer-events:none}
.speak-btn{
  border:1px solid var(--line);background:#fff;border-radius:999px;
  padding:8px 20px;font-size:13.5px;color:var(--green);display:inline-flex;align-items:center;gap:7px;
  transition:all .18s ease;font-family:inherit;
}
.speak-btn:hover{border-color:var(--green);background:var(--green-soft);transform:translateY(-1px)}
.speak-btn:active{transform:translateY(0)}
.sound-btn{
  width:38px;height:38px;border-radius:50%;border:1px solid var(--line);background:#fff;
  font-size:15px;cursor:pointer;flex-shrink:0;transition:all .18s ease;
  display:flex;align-items:center;justify-content:center;
}
.sound-btn:hover{border-color:var(--green);transform:scale(1.06)}
.sound-btn.off{opacity:.5;filter:grayscale(.6)}
@keyframes floaty{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
.module-card .m-ico{animation:floaty 3.5s ease-in-out infinite}
.checkin-band{transition:transform .2s ease}
.paper-list{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:8px}
.paper-card{
  padding:26px 24px;display:flex;flex-direction:column;gap:10px;cursor:pointer;
  transition:all .22s ease;position:relative;overflow:hidden;
}
.paper-card::after{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--gold),var(--green));transform:scaleX(0);
  transform-origin:left;transition:transform .3s ease;
}
.paper-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}
.paper-card:hover::after{transform:scaleX(1)}
.paper-card .p-title{font-family:var(--serif);font-size:19px;font-weight:600}
.paper-card .p-sub{font-size:12px;color:var(--sub);letter-spacing:2px}
.paper-card .p-meta{display:flex;gap:8px;flex-wrap:wrap}
.paper-card .p-best{margin-top:auto;padding-top:12px;border-top:1px dashed var(--line-soft);font-size:13px;color:var(--sub)}
.paper-card .p-best b{color:var(--gold);font-family:var(--serif);font-size:18px}
.paper-card.predict{background:linear-gradient(150deg,#fff,var(--gold-soft))}
.paper-card.import-card{align-items:flex-start;text-align:left}
.score small{transition:none}
.week-cell{transition:all .3s ease}
.week-cell.hot{animation:fadeUp .5s ease both}

/* ---------- v3 新增：考试中心分区 / 答题卡 / 标记 / 生词 / 导入 ---------- */
.exam-block{margin-top:34px}
.exam-block-title{
  font-family:var(--serif);font-size:20px;font-weight:600;
  display:flex;align-items:center;gap:10px;margin-bottom:4px;
}
.exam-block-title::before{content:"";width:5px;height:20px;border-radius:3px;background:var(--gold)}
.exam-block-sub{font-size:13.5px;color:var(--sub);margin-bottom:16px}
.mark-btn{
  border:none;background:none;color:var(--gold);font-size:17px;line-height:1;
  cursor:pointer;margin-right:8px;vertical-align:-2px;transition:transform .15s ease;
}
.mark-btn:hover{transform:scale(1.25)}
.sheet-toggle{
  position:fixed;top:80px;left:26px;z-index:41;
  background:var(--gold);color:#fff;border:none;border-radius:999px;
  padding:10px 20px;font-size:14px;font-weight:500;cursor:pointer;
  box-shadow:var(--shadow-lg);transition:transform .15s ease;
}
.sheet-toggle:hover{transform:scale(1.05)}
.sheet-panel{
  position:fixed;top:130px;left:26px;z-index:41;width:270px;
  padding:18px 20px;max-height:calc(100vh - 200px);overflow:auto;
}
.sheet-title{font-family:var(--serif);font-size:16px;display:block;margin-bottom:12px}
.sheet-title span{font-size:13px;color:var(--gold);margin-left:6px;font-family:var(--sans)}
.sheet-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:7px}
.sheet-cell{
  width:34px;height:34px;border-radius:9px;border:1.5px solid var(--line);
  background:#fff;font-size:13px;color:var(--sub);cursor:pointer;transition:all .15s ease;
}
.sheet-cell:hover{border-color:var(--green);transform:scale(1.08)}
.sheet-cell.answered{background:var(--green);border-color:var(--green);color:#fff}
.sheet-cell.marked{box-shadow:0 0 0 2px var(--gold)}
.sheet-legend{display:flex;gap:14px;margin-top:14px;font-size:12px;color:var(--sub)}
.dot-c{display:inline-block;width:10px;height:10px;border-radius:3px;border:1.5px solid var(--line);vertical-align:-1px;margin-right:4px}
.dot-c.answered{background:var(--green);border-color:var(--green)}
.dot-c.marked{box-shadow:0 0 0 2px var(--gold)}
.vw{cursor:pointer;border-bottom:1px dotted var(--gold);transition:all .12s ease}
.vw:hover{background:var(--gold-soft);border-bottom-style:solid}
.vb-item{padding:20px 26px;margin-bottom:14px}
.vb-word{font-family:var(--serif);font-size:24px;font-weight:700;color:var(--green-dark)}
.vb-ctx{font-size:13.5px;color:var(--sub);margin:8px 0 12px;line-height:1.8;font-style:italic}
.vb-actions{display:flex;gap:10px}
.imp-label{display:block;font-size:13px;color:var(--sub);margin-bottom:8px}
.imp-file-row{display:flex;align-items:center;gap:14px;margin-bottom:12px;flex-wrap:wrap}

/* ---------- v5 新增：今日学习 / 学习日历 ---------- */
.today-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin-top:8px}
.today-card{padding:28px 30px;text-align:center;display:flex;flex-direction:column;align-items:center}
.today-card .flip-word,.today-card .flip-ph,.today-card .flip-cn,.today-card .flip-ex{width:100%}
.today-card .opts{text-align:left;width:100%}
.cal-card{padding:24px 26px;margin-top:8px}
.cal-nav{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px}
.cal-title{font-family:var(--serif);font-size:19px}
.cal-week{display:grid;grid-template-columns:repeat(7,1fr);gap:6px;margin-bottom:8px;text-align:center;font-size:12.5px;color:var(--sub)}
.cal-grid{display:grid;grid-template-columns:repeat(7,1fr);gap:6px}
.cal-cell{
  position:relative;min-height:56px;border-radius:10px;border:1.5px solid var(--line-soft);
  background:#fff;cursor:pointer;transition:all .15s ease;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;
}
.cal-cell:hover{border-color:var(--green);transform:translateY(-2px)}
.cal-cell.blank{background:transparent;border:none;pointer-events:none}
.cal-cell.future{opacity:.45}
.cal-cell.active{background:var(--green-soft);border-color:#bcd6cf}
.cal-cell.today .cal-num{color:var(--gold);font-weight:700}
.cal-cell.today{border-color:var(--gold)}
.cal-cell.selected{border-color:var(--green);box-shadow:0 0 0 2px rgba(30,92,79,.18)}
.cal-num{font-size:14px;color:var(--ink)}
.cal-count{font-size:11px;color:var(--green);font-weight:600}
.cal-dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--green);position:absolute;top:6px;right:6px}
.cal-dot.active-d{background:var(--gold);position:static;margin-right:5px}
.cal-legend{display:flex;gap:18px;margin-top:14px;font-size:12.5px;color:var(--sub);align-items:center}
.cal-detail{padding:24px 28px;margin-top:18px}
.cal-detail h3{font-family:var(--serif);font-size:18px;margin-bottom:14px}
@media (max-width:900px){
  .today-grid{grid-template-columns:1fr}
}
.imp-textarea{
  width:100%;min-height:280px;padding:16px 18px;font-size:14.5px;font-family:Consolas,Monaco,monospace;
  border:1.5px solid var(--line);border-radius:12px;background:#fff;outline:none;
  resize:vertical;line-height:1.9;transition:border .15s;
}
.imp-textarea:focus{border-color:var(--green)}
.imp-preview{margin-top:10px;font-size:13.5px;color:var(--green)}
@media (max-width:600px){
  .sheet-toggle{top:auto;bottom:74px;left:16px;padding:9px 16px}
  .sheet-panel{top:auto;bottom:120px;left:16px;width:calc(100vw - 32px)}
  .sheet-grid{grid-template-columns:repeat(6,1fr)}
  .exam-block-title{font-size:18px}
}

.footer{border-top:1px solid var(--line-soft);padding:26px 0;position:relative;z-index:1}
.footer-inner{display:flex;align-items:center;gap:12px;color:var(--sub);font-size:13.5px;flex-wrap:wrap}
.footer-sub{margin-left:auto;letter-spacing:1px;font-family:var(--serif)}

/* ---------- 响应式 ---------- */
@media (max-width:900px){
  .modules{grid-template-columns:repeat(2,1fr)}
  .stat-row,.stats-grid{grid-template-columns:repeat(2,1fr)}
  .writing-grid{grid-template-columns:1fr}
  .paper-list{grid-template-columns:1fr}
  .paper-sheet{padding:36px 26px}
  .paper-info{gap:16px;flex-wrap:wrap}
}
@media (max-width:600px){
  .modules{grid-template-columns:1fr}
  .hero h1{font-size:32px}
  .timer-float{top:auto;bottom:20px;right:16px}
  .checkin-band{padding:22px}
  .checkin-band .right{width:100%;justify-content:space-between}
  .paper-opts{flex-direction:column;gap:8px}
}

/* ---------- 顶栏优化：语言切换胶囊 + 导航滚动渐隐 + 移动端汉堡 ---------- */
.topbar-inner{gap:10px}
.lang-switch{
  flex-shrink:0;display:inline-flex;align-items:center;gap:6px;
  border:1.5px solid var(--line);color:var(--sub);border-radius:999px;
  padding:7px 15px;font-size:13px;font-weight:600;letter-spacing:.5px;
  transition:all .18s ease;white-space:nowrap;background:var(--card);
}
.lang-switch:hover{border-color:var(--green);color:var(--green);background:var(--green-soft);transform:translateY(-1px)}
.lang-switch .ls-flag{font-size:15px;line-height:1}
.nav-wrap{position:relative;flex:1;min-width:0;display:flex;align-items:center;overflow:hidden}
.nav-mask{position:relative;flex:1;min-width:0;overflow:hidden}
.nav{width:100%}
.nav::after{content:'';position:sticky;right:0;top:0;flex:0 0 14px;align-self:flex-start;height:34px;margin-left:-14px;background:linear-gradient(90deg,transparent,var(--paper));pointer-events:none}
.nav-toggle{display:none}
.v-more{margin-left:auto;font-size:12.5px;color:var(--gold);font-weight:500;font-family:var(--sans);letter-spacing:0}
.v-more:hover{text-decoration:underline}

/* ---------- 导航箭头 ---------- */
.nav-arrows{position:absolute;right:-34px;top:50%;transform:translateY(-50%);display:flex;gap:4px;z-index:3}
.nav-arrow{
  width:26px;height:26px;border-radius:50%;border:1px solid var(--line);
  background:var(--card);color:var(--sub);font-size:15px;line-height:1;
  display:flex;align-items:center;justify-content:center;
  opacity:0;transition:opacity .2s ease;pointer-events:none;
}
.nav-arrow:hover{border-color:var(--green);color:var(--green)}
@media (max-width:760px){.nav-arrows{display:none}}