:root{--paper:#f6f4ed;--ink:#173f35;--muted:#626f64;--line:#d9ddd3;--white:#fffefa;--gold:#e8b85b;--red:#a43630;--green:#236246;--soft:#e7eee5;font-family:"Avenir Next","PingFang SC","Microsoft YaHei",sans-serif;color:var(--ink);background:var(--paper);font-synthesis:none;line-height:1.6}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a,input,select{-webkit-tap-highlight-color:transparent}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:default;opacity:.5}button:focus-visible,a:focus-visible,select:focus-visible,input:focus-visible{outline:3px solid #b07416;outline-offset:4px}a{color:inherit;text-decoration:none}button{color:inherit}h1,h2,h3,p{margin:0}h1{font-size:clamp(28px,5vw,42px);line-height:1.3;letter-spacing:-1px}h2{font-size:22px;line-height:1.4}h3{font-size:17px}small{font-size:12px}.masthead{max-width:1040px;margin:auto;padding:24px 28px;display:flex;justify-content:space-between;align-items:center;gap:12px;border-bottom:1px solid var(--line)}.brand{display:flex;gap:12px;align-items:center;font-size:17px;font-weight:700}.brand small{display:block;font-size:9px;letter-spacing:1.8px;font-weight:500}.brand-mark{background:var(--ink);color:var(--gold);font-size:35px;line-height:45px;width:44px;text-align:center;border-radius:12px}.language{border:1px solid var(--line);background:transparent;border-radius:30px;padding:8px 13px;font-size:13px;min-height:44px}.notice{max-width:980px;margin:14px auto 0;background:#fff0cd;border:1px solid #e9c66f;padding:12px 18px;font-size:14px;border-radius:12px}main{max-width:980px;margin:auto;padding:32px 0 118px;min-height:70vh}.eyebrow{display:block;font-size:11px;letter-spacing:2px;text-transform:uppercase;font-weight:700;margin-bottom:10px;color:var(--muted)}.hero{display:grid;grid-template-columns:1fr auto;gap:24px;align-items:center;background:var(--ink);color:var(--paper);border-radius:24px;padding:34px;position:relative;overflow:hidden}.hero .eyebrow{color:#bdd0ba}.hero p{color:#d1ddcc;margin:16px 0 24px;max-width:34em}.hero h1{font-weight:600;letter-spacing:1px}.road{width:150px;height:160px;opacity:.9}.primary,.secondary,.danger,.text-button{min-height:48px;padding:11px 20px;border-radius:12px;font-weight:600;border:1px solid transparent;display:inline-flex;align-items:center;justify-content:center;gap:12px}.primary{background:var(--ink);color:var(--white)}.hero .primary{background:var(--gold);color:var(--ink)}.secondary{background:var(--white);border-color:var(--line)}.danger{background:var(--red);color:white}.text-button{background:transparent;padding:9px 10px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);border:1px solid var(--line);border-radius:18px;overflow:hidden;margin:22px 0 32px}.stat{padding:20px;background:var(--white)}.stat strong{display:block;font-size:30px;font-family:Georgia,serif;line-height:1.2;font-weight:500}.stat span{font-size:13px;color:var(--muted)}.section-head{display:flex;justify-content:space-between;gap:12px;align-items:baseline;margin:28px 0 14px}.section-head span{color:var(--muted);font-size:13px}.cards{display:grid;grid-template-columns:1fr 1fr;gap:14px}.mode-card{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:22px;text-align:left;display:flex;gap:18px;align-items:center;min-height:124px}.mode-card:hover{border-color:var(--ink)}.mode-icon{font-family:Georgia,serif;font-size:27px;min-width:48px;height:48px;display:flex;align-items:center;justify-content:center;border-radius:13px;background:var(--soft)}.mode-card p{font-size:13px;color:var(--muted);margin-top:5px}.arrow{margin-left:auto;font-size:24px}.categories{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.category{border:1px solid var(--line);padding:18px;border-radius:14px;text-align:left;background:transparent}.category span{display:block;font-size:12px;color:var(--muted);margin-top:6px}.source-note{font-size:12px;color:var(--muted);padding:18px 0;margin-top:22px;border-top:1px solid var(--line)}.bottom-nav{position:fixed;z-index:5;bottom:0;left:50%;transform:translateX(-50%);width:min(100%,1040px);padding:9px 12px max(10px,env(safe-area-inset-bottom));display:flex;justify-content:space-around;background:rgba(246,244,237,.97);border-top:1px solid var(--line);backdrop-filter:blur(16px)}.bottom-nav a{display:flex;flex-direction:column;align-items:center;font-size:11px;gap:0;min-width:64px;min-height:48px;color:var(--muted);border-radius:12px}.bottom-nav a span{font-size:25px;line-height:30px}.bottom-nav a.active{background:var(--ink);color:var(--white)}.page-title{margin-bottom:24px}.page-title p{color:var(--muted);margin-top:8px}.toolbar{display:flex;gap:10px;justify-content:space-between;align-items:center;margin-bottom:18px;flex-wrap:wrap}.toolbar .text-button{padding-left:0}.pill{font-size:12px;border:1px solid var(--line);border-radius:20px;padding:5px 12px;display:inline-block;background:var(--white)}.progress-track{height:4px;background:var(--line);border-radius:4px;margin-bottom:24px;overflow:hidden}.progress-track i{display:block;height:100%;background:var(--ink);transition:width .15s}.question-shell{max-width:760px;margin:auto}.question-meta{display:flex;justify-content:space-between;color:var(--muted);font-size:12px;margin-bottom:12px;gap:12px}.question-stem{font-size:20px;font-weight:600;line-height:1.65;white-space:pre-line;overflow-wrap:anywhere}.secondary-language{color:var(--muted);font-size:14px;white-space:pre-line;margin-top:12px}.stem-images{margin:18px 0;display:flex;flex-wrap:wrap;gap:10px}.image-button{border:1px solid var(--line);padding:8px;background:white;border-radius:10px;max-width:100%;display:block}.image-button img{display:block;max-width:100%;max-height:260px;object-fit:contain;margin:auto}.options{display:grid;gap:12px;margin-top:22px}.option{display:grid;grid-template-columns:32px 1fr;align-items:start;gap:12px;text-align:left;border:1.5px solid var(--line);border-radius:14px;padding:16px;background:var(--white);width:100%;min-height:64px}.option:disabled{opacity:1}.option.selected{border-color:var(--ink);background:var(--soft)}.option.correct{border-color:var(--green);background:#e9f3e8}.option.incorrect{border-color:var(--red);background:#fff0eb}.option-letter{width:29px;height:29px;border:1px solid var(--line);border-radius:50%;font-size:14px;font-weight:600;display:flex;align-items:center;justify-content:center;background:white}.selected .option-letter{background:var(--ink);color:white;border-color:var(--ink)}.correct .option-letter{background:var(--green);color:white}.incorrect .option-letter{background:var(--red);color:white}.option-text{font-size:17px;white-space:pre-line;overflow-wrap:anywhere}.option-content img{display:block;max-width:100%;max-height:200px;object-fit:contain;background:white;margin:6px 0;border-radius:4px}.option-content .secondary-language{font-size:12px}.option-tools{display:flex;gap:8px;margin:-6px 0 2px 44px;flex-wrap:wrap}.option-tools button{font-size:12px;border:none;background:transparent;color:var(--muted);padding:5px 8px;min-height:34px;text-decoration:underline}.feedback{border-left:4px solid var(--green);background:#e9f3e8;border-radius:0 12px 12px 0;padding:17px;margin:22px 0}.feedback.wrong{border-color:var(--red);background:#fff0eb}.feedback strong{display:block;font-size:18px}.feedback p{font-size:14px;margin-top:8px;white-space:pre-line}.action-row{display:flex;gap:12px;align-items:center;margin-top:24px}.action-row>*{flex:1}.hint{font-size:12px;color:var(--muted);margin-top:14px}.timer{font-variant-numeric:tabular-nums;font-family:Georgia,serif;font-size:25px;letter-spacing:1px}.timer.urgent{color:var(--red)}.exam-grid{display:grid;grid-template-columns:repeat(10,1fr);gap:8px;margin:16px 0}.exam-grid button{aspect-ratio:1;border:1px solid var(--line);background:var(--white);border-radius:9px;min-height:38px;font-size:13px}.exam-grid button.answered{background:var(--soft);border-color:#9fbaa4}.exam-grid button.current{background:var(--ink);color:white}.exam-details{border:1px solid var(--line);padding:15px 18px;border-radius:14px;margin-top:25px}.exam-details summary{cursor:pointer;font-size:14px}.empty{padding:50px 22px;text-align:center;border:1px dashed var(--line);border-radius:20px;background:var(--white)}.empty p{color:var(--muted);margin:14px auto 24px;max-width:36em}.list{display:grid;gap:12px}.list-item{padding:18px;border:1px solid var(--line);border-radius:14px;background:var(--white)}.list-item-head{display:flex;align-items:center;justify-content:space-between;gap:14px}.list-item h3{overflow-wrap:anywhere;white-space:pre-line}.list-item p{font-size:13px;color:var(--muted);margin-top:6px}.list-item .button-row{margin-top:12px}.button-row{display:flex;gap:10px;flex-wrap:wrap}.button-row button{flex:1}.chips{display:flex;gap:8px;flex-wrap:wrap;margin:18px 0}.chip{border-radius:24px;border:1px solid var(--line);background:var(--white);padding:8px 17px;min-height:44px}.chip.active{background:var(--ink);color:white}.result-hero{text-align:center;border-radius:22px;background:var(--ink);color:white;padding:32px}.result-hero .eyebrow{color:#bed0b9}.result-hero strong{font:72px/1.3 Georgia,serif}.result-hero .score-total{font-size:20px;color:#c4d4c4}.result-hero p{color:#d0dfce}.review-item summary{cursor:pointer;font-weight:600;list-style:none;overflow-wrap:anywhere}.review-item summary small{display:block;color:var(--muted);font-weight:400;margin-bottom:5px}.review-item .question-stem{font-size:17px;margin-top:18px}.settings-card{background:var(--white);border:1px solid var(--line);border-radius:18px;padding:22px;margin-bottom:16px}.settings-card p{font-size:14px;color:var(--muted);margin:9px 0 18px}.settings-card select{background:var(--white);border:1px solid var(--line);padding:10px;border-radius:10px;max-width:100%}.jump-form{display:flex;gap:10px;margin-top:14px}.jump-form input{width:100%;min-width:0;border:1px solid var(--line);border-radius:10px;padding:10px 14px;background:var(--white)}.backup-input{display:none}.offline-status{font-size:13px;color:var(--muted);margin-top:12px}.muted{color:var(--muted)}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}dialog{max-width:min(92vw,600px);padding:26px;border:1px solid var(--line);border-radius:20px;background:var(--white);color:var(--ink)}dialog::backdrop{background:rgba(12,31,26,.7)}dialog p{margin:15px 0 22px}#image-dialog{max-width:96vw;width:900px;padding:14px}#image-dialog img{max-width:100%;display:block;margin:auto}#image-dialog p{text-align:center;margin:8px 0;font-size:12px}.close-image{display:block;margin:0 0 12px auto;min-height:44px;background:var(--ink);color:white;border:0;border-radius:10px;padding:8px 18px}.loading{animation:pulse 1.2s ease-in-out infinite}@keyframes pulse{50%{opacity:.45}}@media(min-width:760px){main{animation:arrive .25s ease-out}.question-shell{background:var(--white);padding:30px;border:1px solid var(--line);border-radius:24px}.option{background:var(--paper)}}@keyframes arrive{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media(max-width:1040px){main{padding:26px 24px 118px}.notice{margin:12px 24px 0}}@media(max-width:600px){.masthead{padding:17px 20px}.brand{font-size:15px;gap:10px}.brand small{font-size:8px;letter-spacing:1px}.brand-mark{width:38px;line-height:40px;font-size:31px}main{padding:24px 20px 110px}.hero{padding:25px;gap:0;min-height:265px}.hero h1{font-size:30px}.hero p{font-size:13px;margin-top:12px;max-width:18em}.hero .road{width:74px;height:138px;position:absolute;right:13px;bottom:20px;opacity:.42}.hero .primary{position:relative;z-index:1}.stats{margin:18px 0 26px}.stat{padding:16px 12px}.stat strong{font-size:27px}.stat span{font-size:11px}.cards{gap:10px}.mode-card{padding:17px 14px;display:block;min-height:150px;position:relative}.mode-icon{width:38px;min-width:38px;height:36px;font-size:23px;margin-bottom:12px;border-radius:9px}.mode-card h3{font-size:16px}.mode-card p{font-size:11px}.mode-card .arrow{position:absolute;right:14px;top:18px}.categories{grid-template-columns:1fr;gap:9px}.category{display:flex;align-items:center;justify-content:space-between;padding:15px 17px}.category span{margin:0}.question-stem{font-size:19px}.option{padding:14px 12px;gap:10px}.option-text{font-size:16px}.exam-grid{grid-template-columns:repeat(7,1fr);gap:6px}.exam-grid button{min-height:36px}.action-row{gap:8px}.primary,.secondary,.danger{padding:11px 15px;font-size:14px}.page-title{margin-bottom:22px}.notice{margin:12px 20px 0;font-size:12px}.list-item{padding:15px}.settings-card{padding:18px}.source-note{font-size:11px}h2{font-size:20px}}@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}
[hidden]{display:none!important}.auth-layout{display:grid;grid-template-columns:1fr 1fr;gap:38px;align-items:start;margin:22px 0}.auth-story{background:var(--ink);color:var(--white);border-radius:24px;padding:36px;min-height:480px;position:relative;overflow:hidden}.auth-story::after{content:'↗';position:absolute;right:10px;bottom:5px;font:210px/1 Georgia,serif;color:#e8b85b;opacity:.16;pointer-events:none}.auth-story .eyebrow{color:#bfd1bc}.auth-story h1{font-size:39px;line-height:1.6;margin:26px 0 22px}.auth-story p{font-size:15px;color:#d1ddcc}.auth-highlights{display:grid;gap:10px;margin-top:30px;font-size:13px;color:#d1ddcc}.auth-highlights span::before{content:'✓';padding-right:12px;color:var(--gold)}.auth-card{padding:22px 8px}.auth-card>p{font-size:14px;margin:10px 0 24px}.form-field{display:block;margin:16px 0}.form-field span{display:block;font-size:13px;font-weight:600;margin-bottom:7px}.form-field input{display:block;width:100%;min-height:48px;border:1px solid var(--line);border-radius:10px;padding:12px;background:var(--white);color:var(--ink);font-size:16px}.form-field input::placeholder{font-size:12px;color:#748074}.form-error{color:var(--red);font-size:13px;margin:10px 0;min-height:20px}.wide{width:100%}.auth-links{display:flex;justify-content:space-between;flex-wrap:wrap;margin-top:14px}.auth-links .text-button{font-size:12px;padding:8px 0}.auth-card .hint a{display:block;text-decoration:underline;margin-top:10px}.recovery-card{border-color:#d2a447;background:#fff5da}.recovery-code{display:block;overflow-wrap:anywhere;word-break:break-all;font:18px/1.7 ui-monospace,monospace;letter-spacing:1px;padding:15px;background:white;border:1px dashed #be9440;border-radius:10px;margin:18px 0;user-select:all}.settings-card h2:not(:first-child){margin-top:24px}.settings-card .button-row+.button-row{margin-top:14px}@media(max-width:700px){.auth-layout{grid-template-columns:1fr;gap:12px;margin-top:0}.auth-story{min-height:0;padding:24px}.auth-story h1{font-size:27px;line-height:1.5;margin:12px 0}.auth-story p{font-size:13px}.auth-highlights{display:none}.auth-story::after{font-size:160px;bottom:-12px}.auth-card{padding:22px 2px}.auth-card h2{font-size:22px}.auth-card>p{margin-bottom:18px}.form-field{margin:14px 0}}
/* Interface and question languages are independent; layout accommodates either. */
.brand>span:last-child{min-width:0}.brand-mark{flex-shrink:0}.language{flex-shrink:0}.brand-name{overflow-wrap:anywhere}.bottom-nav a .nav-label{font-size:11px;line-height:18px}.hero h1,.hero p,.auth-story h1,.auth-story p{white-space:pre-line}.mode-select-label{display:block;font-size:13px;margin:12px 0 6px}.hero select{display:block;max-width:100%;border:1px solid #b8c9b5;border-radius:10px;background:var(--white);color:var(--ink);padding:10px;margin-bottom:20px}.translation-checkbox{display:flex;align-items:center;gap:10px;margin-top:18px;font-size:14px}.translation-checkbox input{width:20px;height:20px;accent-color:var(--ink)}.mode-card>div{min-width:0}.mode-card h3,.category h3,.settings-card h2,.section-head{overflow-wrap:anywhere}.option-content{min-width:0}.question-meta{flex-wrap:wrap}.section-head{flex-wrap:wrap}.button-row>*{max-width:100%}.action-row{flex-wrap:wrap}.action-row>*{min-width:0}.auth-story h1{line-height:1.35}.auth-layout .auth-story p{line-height:1.8}.settings-card p{overflow-wrap:anywhere}
@media(max-width:380px){.masthead{padding:15px 16px;gap:8px}.brand{font-size:13px;gap:8px}.brand small{font-size:7px;letter-spacing:.7px}.brand-mark{width:32px;line-height:36px;font-size:27px}.language{padding:8px 10px;font-size:12px}.hero h1{font-size:27px}.hero{padding:22px}.stat{padding:14px 9px}.stat strong{font-size:25px}.bottom-nav a{min-width:58px}.button-row .secondary,.button-row .primary{min-width:min(100%,145px)}.category{gap:8px}.category span{flex-shrink:0}}