:root{
  --red:#e8734a;        /* brand primary (was crimson, now terracotta) */
  --redl:#f4b860;       /* brand light (amber) */
  --redbg:#fff3e9;      /* brand tint background */
  --wrong:#e53e3e;      /* wrong-answer red (was --red/--redbg) */
  --wrongbg:#fdecea;
  --grn:#27ae60;--grnbg:#eafaf1;
  --gold:#f39c12;
  --dk:#5c3a2e;
  --gy:#a5714f;
  --lt:#f5e6da;
  --wh:#fff;
  --sh:0 4px 16px rgba(124,58,29,.10);
  --blu:#2980b9;--blul:#3498db;
  --purple:#8e44ad;--purplel:#9b59b6;
}
*{margin:0;padding:0;box-sizing:border-box}
body{font-family:'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;background:linear-gradient(135deg,#fffaf5,#fef3e7);color:var(--dk);line-height:1.7;min-height:100vh}
a{color:inherit;text-decoration:none}

.topbar{background:linear-gradient(135deg,var(--red),var(--redl));color:var(--wh);padding:14px 28px;display:flex;justify-content:space-between;align-items:center;position:sticky;top:0;z-index:100;box-shadow:0 3px 16px rgba(232,115,74,.25)}
.topbar h1{font-size:1.2rem;font-weight:600}
.topbar-left{display:flex;align-items:center;gap:12px}
.back-btn{background:rgba(255,255,255,.2);border:1px solid rgba(255,255,255,.4);color:var(--wh);padding:6px 14px;border-radius:8px;cursor:pointer;font-size:.85rem;transition:all .15s;display:none}
.back-btn:hover{background:rgba(255,255,255,.35)}
.timer-box{display:flex;align-items:center;gap:8px;font-size:1.1rem;font-variant-numeric:tabular-nums;display:none}
#clock{font-weight:700;min-width:60px;text-align:center}
#clock.warn{color:#f1c40f;animation:pulse 1s infinite}
#clock.danger{color:var(--wrong);animation:pulse .5s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.5}}
.container{max-width:900px;margin:0 auto;padding:24px 20px 90px}

/* ===== RUBY PINYIN ===== */
.ch{display:inline-block;text-align:center;vertical-align:bottom;margin:0 1px;line-height:1.2}
.ch .py{display:block;font-size:.6em;color:#999;font-weight:400;line-height:1.3;letter-spacing:.5px;white-space:nowrap}
.ch .hz{display:block;font-size:1em;line-height:1.4}
.cg{display:inline-flex;align-items:flex-end;flex-wrap:wrap;gap:1px;line-height:1}

/* ===== PAGE: BOOK SELECT ===== */
.page{display:none}
.page.active{display:block}
.hero{text-align:center;padding:60px 20px 30px}
.hero h2{font-size:2.2rem;color:var(--dk);margin-bottom:6px}
.hero .sub{font-size:1.05rem;color:var(--gy);margin-bottom:10px}
.hero .sub2{font-size:.88rem;color:#c9a68c;margin-bottom:40px}
.book-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:24px;max-width:800px;margin:0 auto;padding:0 20px}
.book-card{background:var(--wh);border-radius:20px;overflow:hidden;box-shadow:0 4px 20px rgba(124,58,29,.08);cursor:pointer;transition:all .25s;border:3px solid transparent;position:relative}
.book-card:hover{transform:translateY(-4px);box-shadow:0 8px 30px rgba(124,58,29,.14);border-color:var(--red)}
.book-card.disabled{opacity:.5;cursor:not-allowed;filter:grayscale(.4)}
.book-card.disabled:hover{transform:none;box-shadow:0 4px 20px rgba(124,58,29,.08);border-color:transparent}
.book-banner{height:140px;display:flex;align-items:center;justify-content:center;color:var(--wh);font-size:1.8rem;font-weight:800;letter-spacing:1px}
.book-banner.hsk1{background:linear-gradient(135deg,var(--red),var(--redl))}
.book-banner.hsk2{background:linear-gradient(135deg,var(--blu),var(--blul))}
.book-banner.hsk3{background:linear-gradient(135deg,var(--purple),var(--purplel))}
.book-info{padding:20px 22px 24px}
.book-info h3{font-size:1.15rem;color:var(--dk);margin-bottom:6px}
.book-info p{font-size:.88rem;color:var(--gy);line-height:1.5}
.badge{position:absolute;top:14px;right:14px;background:var(--gold);color:var(--wh);font-size:.7rem;font-weight:700;padding:3px 10px;border-radius:12px}
.badge.soon{background:var(--gy)}

/* ===== PAGE: TEST SELECT ===== */
.test-hero{text-align:center;padding:40px 20px 20px}
.test-hero h2{font-size:1.8rem;color:var(--red);margin-bottom:4px}
.test-hero .sub{font-size:.95rem;color:var(--gy);margin-bottom:36px}
.test-group{background:var(--wh);border-radius:16px;padding:28px 30px;margin-bottom:22px;box-shadow:var(--sh)}
.test-group-header{display:flex;align-items:center;gap:12px;margin-bottom:6px}
.test-group-icon{width:44px;height:44px;border-radius:12px;background:linear-gradient(135deg,var(--red),var(--redl));color:var(--wh);display:flex;align-items:center;justify-content:center;font-size:1.1rem;font-weight:800;flex-shrink:0}
.test-group-title{font-size:1.15rem;font-weight:700;color:var(--dk)}
.test-group-desc{font-size:.85rem;color:var(--gy);margin:4px 0 18px 56px;line-height:1.5}
.test-group-info{display:flex;gap:20px;margin:0 0 18px 56px;flex-wrap:wrap}
.tg-info{font-size:.82rem;color:var(--gy)}
.tg-info span{font-weight:700;color:var(--dk)}
.test-btns{display:flex;gap:12px;margin-left:56px;flex-wrap:wrap}
.test-btn{padding:12px 32px;font-size:.98rem;font-weight:600;border:none;border-radius:12px;cursor:pointer;color:var(--wh);transition:all .2s;display:flex;align-items:center;gap:8px}
.test-btn:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(124,58,29,.15)}
.test-btn-a{background:linear-gradient(135deg,var(--red),var(--redl))}
.test-btn-b{background:linear-gradient(135deg,var(--blu),var(--blul))}
.test-btn .icon{font-size:1.1em}
.test-group.locked{opacity:.55}
.test-group.locked .test-btn{cursor:not-allowed;opacity:.5}
.test-group.locked .test-btn:hover{transform:none;box-shadow:none}

/* ===== PAGE: TEST ===== */
.section{background:var(--wh);border-radius:16px;padding:26px 28px;margin-bottom:22px;box-shadow:var(--sh)}
.sec-title{font-size:1.15rem;font-weight:700;color:var(--red);border-bottom:2px solid var(--lt);padding-bottom:10px;margin-bottom:18px}
.part-title{font-size:1rem;font-weight:700;color:var(--dk);margin-bottom:6px}
.part-desc{font-size:.85rem;color:var(--gy);margin-bottom:16px;line-height:1.5}
.question{margin-bottom:28px;padding-bottom:24px;border-bottom:1px solid #f3e6da}
.question:last-child{border-bottom:none;margin-bottom:0;padding-bottom:0}
.q-head{display:flex;align-items:center;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.q-num{background:var(--red);color:var(--wh);width:30px;height:30px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;font-size:.82rem;font-weight:700;flex-shrink:0}
.audio-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 22px;background:linear-gradient(135deg,var(--blu),var(--blul));color:var(--wh);border:none;border-radius:22px;cursor:pointer;font-size:.92rem;font-weight:600;transition:all .15s;user-select:none}
.audio-btn:hover{transform:scale(1.04);box-shadow:0 3px 12px rgba(41,128,185,.3)}
.audio-btn.off{opacity:.45;cursor:not-allowed;transform:none;box-shadow:none}
.audio-btn .speaker{font-size:1.2em}
.audio-text{margin:10px 0;padding:12px 16px;background:#eef6fc;border-left:3px solid var(--blu);border-radius:0 8px 8px 0;font-size:1rem;line-height:2.2;display:none}
.audio-text .spk{font-weight:700;color:var(--blu);margin-right:6px}
.tts-note{font-size:.72rem;color:#c9a68c;margin-top:4px;font-style:italic}
.q-stem{font-size:1.05rem;line-height:2.4;margin-bottom:10px}
.q-passage{background:#fdf7f1;border-left:3px solid var(--red);padding:14px 18px;border-radius:0 8px 8px 0;margin:10px 0 12px;font-size:1.05rem;line-height:2.4}
.q-question{font-size:1.02rem;line-height:2.2;margin-bottom:10px;font-weight:600}
.q-blank{display:inline-block;min-width:56px;border-bottom:2.5px solid var(--red);margin:0 3px;text-align:center;vertical-align:baseline}
.options{display:grid;gap:10px;margin-top:8px}
.opt{display:flex;align-items:center;gap:12px;padding:14px 18px;border:2px solid var(--lt);border-radius:12px;cursor:pointer;transition:all .15s;font-size:1rem;line-height:1.8;min-height:52px}
.opt:hover{border-color:var(--redl);background:var(--redbg)}
.opt input{display:none}
.opt.sel{border-color:var(--red);background:var(--redbg)}
.opt.sel .mk{background:var(--red);color:var(--wh);border-color:var(--red)}
.opt.correct{border-color:var(--grn)!important;background:var(--grnbg)!important}
.opt.correct .mk{background:var(--grn);color:var(--wh);border-color:var(--grn)}
.opt.wrong{border-color:var(--wrong)!important;background:var(--wrongbg)!important}
.opt.wrong .mk{background:var(--wrong);color:var(--wh);border-color:var(--wrong)}
.mk{width:28px;height:28px;border-radius:50%;border:2px solid #d9c3b0;display:flex;align-items:center;justify-content:center;font-size:.78rem;font-weight:700;flex-shrink:0;transition:all .15s;color:#b89478}
.opt-content{flex:1;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.explain{margin-top:8px;padding:10px 14px;border-radius:8px;font-size:.88rem;line-height:1.6;display:none}
.explain.show{display:block}
.explain.right{background:var(--grnbg);color:#1e8449}
.explain.wrong{background:var(--wrongbg);color:var(--wrong)}

/* ===== BOTTOM BAR ===== */
.bottom-bar{position:fixed;bottom:0;left:0;right:0;background:var(--wh);border-top:1px solid var(--lt);padding:14px 24px;display:none;z-index:100;box-shadow:0 -2px 12px rgba(124,58,29,.06)}
.bottom-inner{max-width:900px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;gap:16px}
.progress-text{font-size:.88rem;color:var(--gy)}
.progress-text span{font-weight:700;color:var(--dk)}
.progress-bar{flex:1;max-width:300px;height:8px;background:var(--lt);border-radius:8px;overflow:hidden}
.progress-fill{height:100%;background:linear-gradient(90deg,var(--red),var(--redl));border-radius:8px;transition:width .3s}
.submit-btn{padding:12px 36px;background:linear-gradient(135deg,var(--grn),#2ecc71);color:var(--wh);border:none;border-radius:12px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s;white-space:nowrap}
.submit-btn:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(39,174,96,.3)}

/* ===== RESULT ===== */
.result-card{background:var(--wh);border-radius:20px;padding:40px;text-align:center;box-shadow:0 4px 24px rgba(124,58,29,.10);margin:40px auto;max-width:600px}
.result-card h2{font-size:1.6rem;margin-bottom:6px}
.result-score{font-size:4rem;font-weight:800;margin:16px 0;background:linear-gradient(135deg,var(--red),var(--redl));-webkit-background-clip:text;-webkit-text-fill-color:transparent}
.result-breakdown{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}
.rb-item{background:#fdf7f1;border-radius:12px;padding:16px}
.rb-item .label{font-size:.85rem;color:var(--gy)}
.rb-item .val{font-size:1.4rem;font-weight:700;color:var(--dk)}
.result-stats{display:flex;justify-content:center;gap:32px;margin:20px 0}
.stat{text-align:center}
.stat .num{font-size:1.5rem;font-weight:700}
.stat .lbl{font-size:.8rem;color:var(--gy)}
.stat.ok .num{color:var(--grn)}
.stat.no .num{color:var(--wrong)}
.home-btn{margin-top:24px;padding:14px 44px;background:linear-gradient(135deg,var(--red),var(--redl));color:var(--wh);border:none;border-radius:12px;font-size:1rem;font-weight:700;cursor:pointer;transition:all .2s}
.home-btn:hover{transform:translateY(-2px);box-shadow:0 4px 16px rgba(232,115,74,.3)}

/* ===== LANDING PAGE ===== */
.landing-hero{text-align:center;padding:48px 20px 8px}
.landing-hero h2{font-size:1.8rem;color:var(--dk)}
.landing-hero .sub{font-size:.9rem;color:var(--gy);margin-top:4px}
.landing-grid{display:flex;gap:16px;padding:28px 24px;flex-wrap:wrap;justify-content:center;max-width:700px;margin:0 auto}
.landing-card{flex:1;min-width:220px;background:var(--wh);border-radius:16px;padding:24px;box-shadow:var(--sh);text-align:center;cursor:pointer;transition:all .2s}
.landing-card:hover{transform:translateY(-4px);box-shadow:0 8px 26px rgba(124,58,29,.14)}
.landing-card .emoji{font-size:2rem}
.landing-card .title{font-weight:700;color:var(--dk);margin:8px 0 4px}
.landing-card .desc{font-size:.8rem;color:var(--gy)}

/* ===== LOGIN PAGE ===== */
.login-wrap{display:flex;align-items:center;justify-content:center;min-height:100vh;padding:20px}
.login-card{background:var(--wh);border-radius:20px;padding:40px;max-width:360px;width:100%;box-shadow:var(--sh);text-align:center}
.login-card h2{color:var(--dk);margin-bottom:6px}
.login-card .sub{font-size:.85rem;color:var(--gy);margin-bottom:24px}
.login-card input{width:100%;padding:12px 14px;border:2px solid var(--lt);border-radius:10px;font-size:1rem;margin-bottom:14px}
.login-card input:focus{outline:none;border-color:var(--red)}
.login-card button{width:100%;padding:12px;background:linear-gradient(135deg,var(--red),var(--redl));color:var(--wh);border:none;border-radius:10px;font-size:1rem;font-weight:700;cursor:pointer}
.login-error{color:var(--wrong);font-size:.85rem;margin-bottom:10px;display:none}
.login-error.show{display:block}

/* ===== SLIDES PAGE ===== */
.slides-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:20px;max-width:800px;margin:0 auto;padding:0 20px}
.slide-card{background:var(--wh);border-radius:16px;padding:22px;box-shadow:var(--sh);cursor:pointer;transition:all .2s;text-align:center}
.slide-card:hover{transform:translateY(-4px);box-shadow:0 8px 26px rgba(124,58,29,.14)}
.slide-card .emoji{font-size:1.8rem}
.slide-card .title{font-weight:700;color:var(--dk);margin-top:8px}

@media(max-width:600px){
  .topbar{padding:10px 16px}
  .topbar h1{font-size:1rem}
  .container{padding:16px 12px 90px}
  .section{padding:18px 16px}
  .opt{padding:10px 12px}
  .result-card{padding:28px 20px}
  .book-grid{grid-template-columns:1fr}
  .test-group-desc,.test-group-info,.test-btns{margin-left:0}
  .bottom-inner{flex-wrap:wrap;gap:10px}
  .progress-bar{max-width:100%;order:3;width:100%}
  .landing-grid{flex-direction:column}
}