:root{
  --bg:#F7FAFC;--surface:#fff;--text:#263238;--muted:#66707D;--border:#E6EDF3;
  --blue:#6AA9FF;--green:#73CFA2;--yellow:#F6C85F;--coral:#F28C82;--purple:#B79CED;
  --sky:#E8F3FF;--mint:#DFF7EC;--cream:#FFF5DD;--danger-soft:#FFF1F2;
  --shadow:0 14px 34px rgba(64,78,92,.10);--radius-lg:28px;--radius-md:20px;--radius-sm:14px;
  --font-min:20px;
}
*{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;font-size:20px;background:var(--bg)}
html,body{margin:0;min-height:100%;background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",Arial,sans-serif}
body{font-size:20px;line-height:1.55}
button,input,select{font:inherit}button{cursor:pointer;touch-action:manipulation}img{display:block;max-width:100%}.hidden{display:none!important}
.app-shell{min-height:100vh;padding:18px max(24px,env(safe-area-inset-right)) max(34px,env(safe-area-inset-bottom)) max(24px,env(safe-area-inset-left))}
.topbar{max-width:1440px;margin:0 auto 18px;display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px}
.nav-left{display:flex;align-items:center;gap:14px;min-width:0}.brand{display:flex;align-items:center;gap:12px;min-width:0}.brand-mark{width:54px;height:54px;border-radius:17px;background:linear-gradient(145deg,#6AA9FF,#9AC5FF);display:grid;place-items:center;font-size:30px;box-shadow:0 10px 24px rgba(106,169,255,.25)}
.brand h1{font-size:26px;margin:0;line-height:1.15;white-space:nowrap}.brand p{margin:4px 0 0;color:var(--muted);font-size:20px;white-space:nowrap}
.global-back{height:56px;min-width:120px;border:2px solid #CFE0EF;background:#fff;color:#2F5F8C;border-radius:18px;padding:0 18px;font-size:22px;font-weight:800;box-shadow:0 6px 16px rgba(64,78,92,.08)}
.global-back:active{transform:scale(.98)}
.toolbar{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.icon-btn,.pill-btn{border:1px solid var(--border);background:#fff;color:var(--text);min-height:54px;padding:0 16px;border-radius:16px;display:inline-flex;align-items:center;gap:8px;box-shadow:0 5px 14px rgba(64,78,92,.05);font-size:20px;font-weight:700}
.primary-btn{border:0;background:var(--text);color:#fff;min-height:60px;padding:0 26px;border-radius:18px;font-weight:800;font-size:22px;box-shadow:0 10px 22px rgba(38,50,56,.17)}
.primary-btn.blue{background:#5E9FF2}.primary-btn.green{background:#56B98A}.primary-btn.light{background:#EFF6FF;color:#35689E;box-shadow:none}
.secondary-btn{border:1px solid var(--border);background:#fff;color:var(--text);min-height:58px;padding:0 22px;border-radius:18px;font-size:20px;font-weight:800}
.page{max-width:1440px;margin:0 auto}
.hero{display:grid;grid-template-columns:minmax(0,1.08fr) minmax(360px,.92fr);gap:24px;align-items:stretch}.hero-copy{background:linear-gradient(135deg,#EDF6FF 0%,#F9FCFF 55%,#F2FBF7 100%);border:1px solid #E3EFFA;border-radius:32px;padding:36px;min-height:370px;position:relative;overflow:hidden}.hero-copy:after{content:"";position:absolute;right:-80px;bottom:-100px;width:300px;height:300px;border-radius:50%;background:rgba(106,169,255,.10)}
.eyebrow{display:inline-flex;align-items:center;gap:8px;color:#4D7FB6;background:#fff;border:1px solid #DDEBFA;border-radius:999px;padding:9px 14px;font-size:20px;font-weight:800}.hero h2{font-size:46px;line-height:1.18;margin:18px 0 14px;letter-spacing:-.03em}.hero-copy p{font-size:24px;line-height:1.65;color:var(--muted);max-width:760px;margin:0}.hero-actions{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}.hero-stats{display:flex;gap:12px;margin-top:24px;flex-wrap:wrap}.stat-chip{background:#fff;border:1px solid var(--border);border-radius:17px;padding:12px 16px;min-width:148px}.stat-chip b{font-size:28px;display:block}.stat-chip span{font-size:20px;color:var(--muted)}
.hero-media{border-radius:32px;overflow:hidden;min-height:370px;box-shadow:var(--shadow);position:relative;background:#DDE9F4}.hero-media img{width:100%;height:100%;object-fit:cover}.hero-media:after{content:"";position:absolute;inset:auto 0 0;height:38%;background:linear-gradient(transparent,rgba(18,31,44,.58))}.media-caption{position:absolute;z-index:2;bottom:22px;left:24px;right:24px;color:#fff}.media-caption b{font-size:26px}.media-caption span{display:block;margin-top:5px;font-size:20px;opacity:.95}
.section-head{display:flex;align-items:end;justify-content:space-between;gap:16px;margin:32px 4px 16px}.section-head h3{margin:0;font-size:32px}.section-head p{margin:6px 0 0;color:var(--muted);font-size:20px}
.module-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px}.module-card{background:#fff;border:1px solid var(--border);border-radius:24px;padding:20px;text-align:left;min-height:225px;display:flex;flex-direction:column;justify-content:space-between;transition:.2s ease;box-shadow:0 6px 16px rgba(64,78,92,.04)}.module-icon{width:58px;height:58px;border-radius:18px;display:grid;place-items:center;font-size:32px;margin-bottom:14px}.module-card h4{font-size:24px;line-height:1.4;margin:0 0 8px}.module-card p{font-size:20px;line-height:1.55;color:var(--muted);margin:0}.mini-progress{height:9px;background:#EDF1F5;border-radius:999px;overflow:hidden;margin-top:16px}.mini-progress i{display:block;height:100%;border-radius:999px}.module-card .meta{display:flex;justify-content:space-between;align-items:center;font-size:20px;color:var(--muted);margin-top:8px}
.module-hero{display:grid;grid-template-columns:1.25fr .75fr;gap:20px}.module-copy{background:#fff;border:1px solid var(--border);border-radius:28px;padding:30px}.back-link{display:none}.module-copy h2{font-size:40px;margin:4px 0 10px}.module-copy p{color:var(--muted);font-size:22px;line-height:1.65;margin:0}.module-media{border-radius:28px;overflow:hidden;min-height:235px;box-shadow:var(--shadow)}.module-media img{width:100%;height:100%;object-fit:cover}
.level-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}.level-card{border:1px solid var(--border);background:#fff;border-radius:22px;padding:20px;text-align:left;min-height:160px}.level-badge{display:inline-flex;padding:7px 11px;border-radius:999px;background:#F1F6FA;font-size:20px;color:#4E6F90;font-weight:900}.level-card h4{margin:12px 0 6px;font-size:24px}.level-card p{margin:0;color:var(--muted);font-size:20px;line-height:1.5}.level-card .level-progress{font-size:20px;color:var(--muted);margin-top:12px}
.question-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:12px;margin-top:16px}.q-tile{aspect-ratio:1.25;background:#fff;border:1px solid var(--border);border-radius:18px;overflow:hidden;position:relative;padding:0}.q-tile img{width:100%;height:100%;object-fit:cover}.q-tile .qid{position:absolute;left:8px;top:8px;background:rgba(255,255,255,.94);padding:5px 8px;border-radius:10px;font-size:20px;font-weight:900}.q-tile.done:after{content:"✓";position:absolute;right:8px;top:8px;width:34px;height:34px;border-radius:50%;display:grid;place-items:center;background:#52BA87;color:white;font-size:22px;font-weight:900}
.training-layout{display:grid;grid-template-columns:minmax(300px,.68fr) minmax(520px,1.32fr);gap:20px;align-items:stretch}.scene-card,.question-card{background:#fff;border:1px solid var(--border);border-radius:28px;box-shadow:var(--shadow);overflow:hidden}.scene-card{min-height:500px;position:relative;background:#EAF0F5}.scene-card img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0}.scene-badge{position:absolute;left:16px;top:16px;background:rgba(255,255,255,.94);border-radius:15px;padding:9px 12px;font-size:20px;font-weight:900;box-shadow:0 7px 20px rgba(0,0,0,.08)}
.question-card{padding:26px;display:flex;flex-direction:column;min-height:500px}.progress-row{display:flex;align-items:center;gap:12px}.progress-track{flex:1;height:11px;background:#EDF1F4;border-radius:99px;overflow:hidden}.progress-track i{height:100%;display:block;background:linear-gradient(90deg,#6AA9FF,#73CFA2);border-radius:99px}.progress-label{font-size:20px;color:var(--muted);white-space:nowrap}.q-meta{display:flex;justify-content:space-between;align-items:center;margin-top:16px;color:var(--muted);font-size:20px;gap:12px}.q-title{font-size:38px;line-height:1.38;margin:16px 0 18px;letter-spacing:-.02em}.speak-btn{border:0;background:#EEF6FF;color:#4479B3;border-radius:15px;padding:11px 14px;font-size:20px;font-weight:800}.options{display:grid;gap:12px}.option-btn{border:2px solid #E4ECF3;background:#FBFCFD;text-align:left;color:var(--text);border-radius:19px;padding:16px 18px;font-size:24px;line-height:1.48;min-height:70px;font-weight:650}.option-btn.correct{border-color:#68C495;background:#EEFAF3;color:#24744E}.option-btn.wrong{border-color:#F0B2B0;background:#FFF3F2;color:#9A4A47}.option-btn.disabled{opacity:.36;pointer-events:none}.feedback{margin-top:14px;border-radius:18px;padding:15px 18px;line-height:1.55;font-size:22px;display:none}.feedback.show{display:block}.feedback.ok{background:#EFFAF4;color:#2F6F4F;border:1px solid #CFEEDC}.feedback.retry{background:#FFF9E8;color:#775E20;border:1px solid #F4DF9B}.feedback small{font-size:20px}.q-actions{margin-top:auto;display:flex;gap:10px;padding-top:18px;flex-wrap:wrap}
.reward-layer{position:fixed;inset:0;z-index:50;background:rgba(24,34,43,.18);backdrop-filter:blur(3px);display:grid;place-items:center}.reward-card{width:min(560px,88vw);background:#fff;border-radius:30px;padding:34px;text-align:center;box-shadow:0 30px 70px rgba(25,37,49,.25);animation:pop .35s ease}.reward-card h3{font-size:38px;margin:10px 0 6px}.reward-card p{margin:0;color:var(--muted);font-size:22px;line-height:1.6}.stars{display:flex;justify-content:center;gap:14px;font-size:64px;margin:6px 0 14px}.stars span{display:inline-block;animation:star .55s cubic-bezier(.3,1.45,.55,1) both}.stars span:nth-child(2){animation-delay:.1s}.stars span:nth-child(3){animation-delay:.2s}@keyframes star{0%{transform:translateY(-20px) scale(.2) rotate(-20deg);opacity:0}100%{transform:none;opacity:1}}@keyframes pop{from{transform:scale(.93);opacity:0}to{transform:scale(1);opacity:1}}
.sentence-wrap{display:grid;grid-template-columns:minmax(320px,.72fr) minmax(520px,1.28fr);gap:20px}.sentence-photo,.sentence-panel{background:#fff;border:1px solid var(--border);border-radius:28px;overflow:hidden;box-shadow:var(--shadow);min-height:500px}.sentence-photo img{width:100%;height:100%;object-fit:cover}.sentence-panel{padding:28px;display:flex;flex-direction:column}.sentence-panel h2{font-size:38px;margin:6px 0 8px}.sentence-panel .lead{color:var(--muted);font-size:22px;line-height:1.65;margin:0 0 18px}.assembly{min-height:112px;border:2px dashed #C8D8E7;border-radius:20px;padding:15px;background:#FAFCFE;display:flex;flex-wrap:wrap;align-content:flex-start;gap:9px;font-size:22px}.chunk-bank{display:flex;flex-wrap:wrap;gap:9px;margin:16px 0}.chunk{border:1px solid #CFE0EF;background:#EEF6FF;color:#3C6794;border-radius:14px;padding:11px 14px;font-size:22px;font-weight:800}.chunk.used{opacity:.3;pointer-events:none}.assembled{background:#DFF7EC;border-color:#BEE8D4;color:#2C7452}.sentence-hint{background:#FFF8E7;border:1px solid #F5E0AA;border-radius:16px;padding:14px;font-size:22px;line-height:1.6;margin-top:10px}
.expression-card{background:#fff;border:1px solid var(--border);border-radius:30px;padding:24px;box-shadow:var(--shadow)}.expression-photo{height:min(40vh,380px);border-radius:22px;overflow:hidden;background:#e8eef4}.expression-photo img{width:100%;height:100%;object-fit:cover}.expression-center{text-align:center;max-width:980px;margin:20px auto 0}.expression-center h2{font-size:38px;margin:0 0 8px}.expression-center p{color:var(--muted);font-size:22px}.target-reveal{display:none;margin:15px auto 0;background:#F5F9FD;border:1px solid #DDEAF4;border-radius:16px;padding:15px 18px;font-size:24px;line-height:1.6;max-width:920px}.target-reveal.show{display:block}
.selfcheck{display:grid;grid-template-columns:1fr .72fr;gap:20px}.selfcheck-main,.selfcheck-side{background:#fff;border:1px solid var(--border);border-radius:28px;padding:28px;box-shadow:var(--shadow)}.selfcheck h2{font-size:38px}.muted{color:var(--muted);font-size:20px}.check-list{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:16px}.check-item{border:1px solid var(--border);border-radius:18px;padding:15px;display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:22px}.check-toggle{width:50px;height:50px;border-radius:15px;border:1px solid #D7E0E8;background:#F7FAFC;font-size:26px}.check-toggle.on{background:#FFF3C8;border-color:#F6CF58}.selfcheck-side img{width:100%;border-radius:20px;aspect-ratio:16/10;object-fit:cover}.selfcheck-side h3{font-size:28px}.selfcheck-side p{color:var(--muted);font-size:21px;line-height:1.6}
.dashboard{display:grid;grid-template-columns:1.1fr .9fr;gap:20px}.dash-card{background:#fff;border:1px solid var(--border);border-radius:24px;padding:24px}.dash-card h2{font-size:38px}.dash-card h3{font-size:28px}.bar-list{display:grid;gap:12px;margin-top:18px}.bar-row{display:grid;grid-template-columns:190px 1fr 72px;gap:12px;align-items:center;font-size:20px}.bar{height:12px;background:#EEF2F5;border-radius:99px;overflow:hidden}.bar i{display:block;height:100%;border-radius:99px}.report-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:18px}.metric{background:#F8FAFC;border:1px solid var(--border);border-radius:17px;padding:16px}.metric b{font-size:32px}.metric span{display:block;color:var(--muted);font-size:20px;margin-top:3px}
.voice-panel{position:fixed;right:24px;bottom:24px;width:min(380px,90vw);background:#fff;border:1px solid var(--border);border-radius:20px;padding:20px;box-shadow:0 18px 50px rgba(32,47,60,.18);z-index:40}.voice-panel h4{margin:0 0 12px;font-size:28px}.voice-panel label{font-size:20px;color:var(--muted);display:block;margin:12px 0 6px}.voice-panel select{width:100%;font-size:20px;padding:8px}.voice-panel input[type=range]{width:100%}.voice-note{font-size:20px;color:var(--muted);line-height:1.55;margin-top:10px}
.empty{background:#fff;border:1px dashed #D3DEE7;border-radius:22px;padding:30px;text-align:center;color:var(--muted);font-size:22px}
@media(max-width:1250px){.module-grid{grid-template-columns:repeat(3,1fr)}.training-layout{grid-template-columns:340px minmax(0,1fr)}.sentence-wrap{grid-template-columns:330px minmax(0,1fr)}.scene-card,.question-card,.sentence-photo,.sentence-panel{min-height:470px}.question-grid{grid-template-columns:repeat(4,1fr)}.brand p{display:none}.toolbar{gap:6px}.pill-btn{padding:0 12px}}
@media(max-width:900px){.hero,.module-hero,.training-layout,.sentence-wrap,.selfcheck,.dashboard{grid-template-columns:1fr}.hero-media{min-height:310px}.scene-card{min-height:300px;max-height:360px}.sentence-photo{min-height:280px;max-height:340px}.module-grid{grid-template-columns:1fr 1fr}.level-list{grid-template-columns:1fr 1fr}.question-grid{grid-template-columns:repeat(3,1fr)}.check-list{grid-template-columns:1fr}.topbar{align-items:flex-start}.toolbar .pill-btn span{display:none}.brand h1{font-size:22px}.global-back{min-width:100px}}
@media(max-width:650px){html,body{font-size:20px}.app-shell{padding:12px}.module-grid,.level-list{grid-template-columns:1fr}.question-grid{grid-template-columns:1fr 1fr}.q-title{font-size:32px}.hero h2{font-size:38px}.hero-copy{padding:24px}.hero-copy p{font-size:20px}.global-back{height:52px;min-width:94px;font-size:20px}.brand-mark{display:none}.toolbar{width:100%;justify-content:flex-start}.topbar{flex-wrap:wrap}.option-btn{font-size:22px}}

/* ===== iPad Air 11 英寸横屏专版 ===== */
.portrait-guard{display:none}
@media (orientation:portrait) and (max-width:1100px){
  .portrait-guard{position:fixed;inset:0;z-index:9999;display:grid;place-items:center;background:linear-gradient(145deg,#edf6ff,#f8fbff 55%,#eefaf4);padding:32px}
  .portrait-guard-card{width:min(620px,92vw);background:#fff;border:2px solid #dceaf6;border-radius:32px;box-shadow:0 28px 80px rgba(38,50,56,.18);padding:42px;text-align:center}
  .rotate-icon{width:96px;height:96px;margin:0 auto 18px;border-radius:28px;display:grid;place-items:center;background:#e8f3ff;color:#3b78b3;font-size:64px;font-weight:900}
  .portrait-guard h2{font-size:38px;margin:0 0 14px}
  .portrait-guard p{font-size:24px;line-height:1.65;color:#66707d;margin:0}
}

/* 11-inch iPad Air landscape CSS viewport is around 1180×820. Keep core learning flow on one wide screen. */
@media (orientation:landscape) and (min-width:950px) and (max-width:1366px){
  html,body{font-size:20px}
  .app-shell{padding:12px max(18px,env(safe-area-inset-right)) max(18px,env(safe-area-inset-bottom)) max(18px,env(safe-area-inset-left))}
  .topbar{margin-bottom:12px;min-height:58px;max-width:1280px}
  .page{max-width:1280px}
  .brand-mark{width:48px;height:48px;border-radius:15px;font-size:27px}
  .brand h1{font-size:24px}.global-back{height:52px;min-width:112px;font-size:22px}
  .icon-btn,.pill-btn{min-height:50px;font-size:20px;padding:0 13px}

  /* 首页：横向充分利用宽度 */
  .hero{grid-template-columns:minmax(0,1.18fr) minmax(360px,.82fr);gap:16px}
  .hero-copy,.hero-media{min-height:315px;border-radius:26px}
  .hero-copy{padding:26px}.hero h2{font-size:40px;margin:12px 0 10px}.hero-copy p{font-size:21px;line-height:1.55}
  .hero-actions{margin-top:16px}.hero-stats{margin-top:16px}.stat-chip{padding:9px 13px;min-width:132px}.stat-chip b{font-size:25px}
  .section-head{margin:22px 4px 12px}.section-head h3{font-size:29px}
  .module-grid{grid-template-columns:repeat(5,minmax(0,1fr));gap:12px}
  .module-card{min-height:215px;padding:16px;border-radius:20px}.module-icon{width:50px;height:50px;font-size:28px;margin-bottom:10px}
  .module-card h4{font-size:22px;line-height:1.3}.module-card p{font-size:19px;line-height:1.42}.module-card .meta{font-size:18px}

  /* 模块页：5级一行显示，题目缩略图横向浏览更方便 */
  .module-hero{grid-template-columns:1.35fr .65fr;gap:16px}.module-copy{padding:22px;border-radius:24px}.module-copy h2{font-size:36px}.module-copy p{font-size:21px;line-height:1.5}
  .module-media{min-height:205px;max-height:245px;border-radius:24px}
  .level-list{grid-template-columns:repeat(5,minmax(0,1fr));gap:10px}.level-card{min-height:150px;padding:15px;border-radius:18px}.level-card h4{font-size:21px;margin:9px 0 5px}.level-card p{font-size:18px;line-height:1.4}.level-card .level-progress{font-size:18px}
  .question-grid{grid-template-columns:repeat(6,1fr);gap:10px}.q-tile .qid{font-size:18px}

  /* 训练题：左图缩小，右侧文字放大；尽量一屏完成 */
  .training-layout{grid-template-columns:minmax(300px,.62fr) minmax(600px,1.38fr);gap:16px}
  .scene-card,.question-card{min-height:630px;max-height:calc(100dvh - 92px);border-radius:24px}
  .scene-card{min-height:630px}.scene-card img{object-fit:cover}.scene-badge{font-size:19px}
  .question-card{padding:22px}.q-meta{margin-top:12px}.q-title{font-size:40px;line-height:1.35;margin:12px 0 16px}
  .option-btn{font-size:25px;min-height:76px;padding:16px 18px}.feedback{font-size:23px;padding:14px 16px}.feedback small{font-size:20px}
  .q-actions{padding-top:12px}.primary-btn{min-height:58px}.secondary-btn{min-height:56px}

  /* 长句：照片只占约三分之一 */
  .sentence-wrap{grid-template-columns:minmax(300px,.6fr) minmax(620px,1.4fr);gap:16px}
  .sentence-photo,.sentence-panel{min-height:630px;max-height:calc(100dvh - 92px);border-radius:24px}
  .sentence-panel{padding:24px}.sentence-panel h2{font-size:36px}.sentence-panel .lead{font-size:21px;line-height:1.55}
  .assembly{min-height:104px;font-size:22px}.chunk{font-size:22px}.sentence-hint{font-size:22px}

  /* 自主表达：图片明显缩小，老人更容易看清正文 */
  .expression-card{padding:18px;border-radius:24px}.expression-photo{height:min(31vh,255px)}
  .expression-center{margin-top:14px}.expression-center h2{font-size:36px}.expression-center p{font-size:22px;line-height:1.55}.target-reveal{font-size:24px}

  .selfcheck{grid-template-columns:1.25fr .75fr;gap:16px}.selfcheck-main,.selfcheck-side{padding:22px}.selfcheck h2{font-size:36px}.check-item{font-size:22px}
  .dashboard{grid-template-columns:1.2fr .8fr;gap:16px}.dash-card{padding:20px}.dash-card h2{font-size:36px}.dash-card h3{font-size:26px}
}