:root{color-scheme:light;--ink:#233e35;--muted:#748078;--green:#245c4b;--paper:#f8f9f5;--line:#e2e8df;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:24px}body{margin:0;background:var(--paper);color:var(--ink)}a{color:inherit}button,a{-webkit-tap-highlight-color:transparent}button{font:inherit}button:focus-visible,a:focus-visible{outline:3px solid #b27e2e;outline-offset:5px}.site-header,main,footer{max-width:1200px;margin:auto;padding-left:40px;padding-right:40px}.site-header{height:100px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.brand{text-decoration:none;display:flex;gap:13px;align-items:center;font-size:19px;letter-spacing:.3px}.brand b{font-weight:650}.brand-mark{display:grid;place-content:center;background:var(--green);color:white;font-size:27px;font-weight:750;width:43px;height:43px;border-radius:13px;position:relative}.brand-mark span{position:absolute;right:7px;bottom:6px;color:#d2db9d}.version{font-size:12px;color:#68766d;border:1px solid var(--line);padding:8px 13px;border-radius:100px;display:flex;align-items:center;gap:8px}.version i{width:6px;height:6px;border-radius:50%;background:#819767}.hero{display:grid;grid-template-columns:1.3fr 1fr;gap:80px;align-items:center;padding:64px 0 63px}.eyebrow{font-size:12px;font-weight:600;letter-spacing:2px;display:flex;gap:9px;align-items:center}.eyebrow>span{height:7px;width:7px;background:#9aac7c;border-radius:50%}h1{font-size:58px;line-height:1.22;letter-spacing:-2px;margin:20px 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span{background:#fff9;width:26px;height:26px;display:grid;place-items:center;border-radius:50%;font-size:10px;letter-spacing:.5px}.note-bottom{border-top:1px solid #dce4d2;padding-top:17px;margin-top:22px;font-size:10px;letter-spacing:.5px;color:#7b8870;display:flex;justify-content:space-between}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:18px}.section-kicker{font-size:11px;color:#7b8d74;letter-spacing:2px}h2{font-size:25px;letter-spacing:-.5px;margin:9px 0 0}.category-badge{font-size:12px;color:#456547;white-space:nowrap;border-radius:8px;background:#eaf0e3;padding:9px 11px}.category-badge span{border-left:1px solid #cdd9c5;margin-left:9px;padding-left:9px}.section-description{font-size:13px;color:var(--muted);margin:14px 0 25px}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:23px;scroll-margin-top:24px}.card{background:#fff;border:1px solid #e1e7df;border-radius:17px;overflow:hidden;box-shadow:0 5px 16px #233e3505;min-width:0;transition:box-shadow .2s,transform .2s}.card:hover{box-shadow:0 8px 25px #233e3510;transform:translateY(-3px)}.image-wrap{position:relative;background:#eef1e8;aspect-ratio:640/440}.image-wrap img{width:100%;height:100%;display:block;object-fit:contain}.card-number{position:absolute;left:16px;top:15px;display:grid;place-items:center;width:30px;height:25px;background:#ffffffc9;border:1px solid #ffffff90;border-radius:6px;color:#67725c;font-size:10px;font-variant-numeric:tabular-nums}.card-content{padding:24px}.word-line{font-size:23px;line-height:1.25;font-weight:700;margin:0;letter-spacing:-.5px;overflow-wrap:anywhere}.pos{font-size:13px;font-weight:400;color:#8b938c;letter-spacing:0;white-space:nowrap;margin-left:4px}.meaning{font-size:15px;color:#6d776f;margin:12px 0 25px}.sound-button{border:1px solid #d9e5dc;border-radius:9px;display:flex;align-items:center;justify-content:center;gap:10px;width:100%;min-height:47px;color:var(--green);background:#f1f6f0;cursor:pointer;font-size:13px;font-weight:600;transition:background .15s}.sound-button:hover{background:#e5eee3}.sound-button[aria-busy=true]{background:#245c4b;color:white}.sound-button svg{width:19px;height:19px;flex-shrink:0}.sound-button:disabled{opacity:.6;cursor:not-allowed}.audio-status{font-size:12px;color:#78867b;min-height:20px;margin:18px 0 0;text-align:center}.preview-notice{display:flex;align-items:center;gap:17px;padding:23px 25px;margin:36px 0 38px;background:#f0f2eb;border:1px solid #e3e8dd;border-radius:12px}.notice-icon{flex-shrink:0;display:grid;place-items:center;width:22px;height:22px;border:1.5px solid #8d9b7e;border-radius:50%;color:#7b8a6c;font-family:Georgia,serif;font-weight:bold}.preview-notice strong{font-size:13px;font-weight:600}.preview-notice p{font-size:12px;line-height:1.8;color:#7f897a;margin:5px 0 0}.notice-count{white-space:nowrap;margin-left:auto;font-size:22px;color:#657958;font-variant-numeric:tabular-nums}.notice-count span{font-size:13px;color:#9da58f}footer{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:25px;padding-bottom:30px;font-size:11px;color:#8b9488}footer>span{font-weight:700;color:#66775d}footer p{margin:0}footer a{text-underline-offset:4px}.skip-link{position:fixed;top:-60px;left:12px;z-index:10;padding:12px;background:white}.skip-link:focus{top:10px}@media(min-width:1400px){.hero{padding-top:75px;padding-bottom:75px}}@media(max-width:950px){.hero{gap:40px}h1{font-size:49px}.cards{gap:16px}.card-content{padding:20px 17px}.word-line{font-size:21px}.practice-note{max-width:310px;padding:27px}.site-header,main,footer{padding-left:28px;padding-right:28px}}@media(max-width:700px){.site-header{height:79px}.site-header,main,footer{padding-left:20px;padding-right:20px}.brand{font-size:16px;gap:9px}.brand-mark{width:36px;height:36px;font-size:24px}.version{font-size:10px;padding:7px 9px}.hero{display:block;padding:36px 0 40px}h1{font-size:46px;margin:18px 0}.eyebrow{font-size:10px;letter-spacing:1.5px}.intro{font-size:13px}.practice-note{display:none}.start-link{margin-top:22px}.section-heading{align-items:center}h2{font-size:21px}.section-kicker{font-size:10px}.category-badge{font-size:10px;padding:8px}.section-description{font-size:12px;line-height:1.8}.cards{grid-template-columns:1fr;gap:22px}.card-content{padding:23px}.word-line{font-size:26px}.meaning{font-size:16px;margin-bottom:21px}.sound-button{min-height:50px;font-size:14px}.preview-notice{padding:20px 17px;gap:12px;align-items:flex-start;margin-top:26px}.notice-count{display:none}footer{gap:14px;flex-wrap:wrap}footer p{order:3;width:100%}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{transition:none!important}.card:hover{transform:none}}
/* 完整版学习工具，沿用已确认的卡片风格。 */
[hidden]{display:none!important}.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}.progress-panel{display:flex;align-items:center;justify-content:space-between;gap:40px;background:#eff2e8;border:1px solid #dfe6d7;border-radius:17px;padding:27px 30px;margin-bottom:43px}.progress-copy h2{font-size:21px}.progress-copy p{font-size:12px;color:#697b64;margin:10px 0 0}.progress-display{width:43%;max-width:430px}.progress-display>div{display:flex;justify-content:space-between;align-items:baseline;margin-bottom:11px}.progress-display strong{font-size:28px;font-variant-numeric:tabular-nums}.progress-display small{font-size:12px;font-weight:400;color:#6c7c67}.progress-display>div>span{font-size:12px;color:#648258}progress{display:block;width:100%;height:8px;border:0;border-radius:20px;overflow:hidden;background:#dce5d4;appearance:none;-webkit-appearance:none}progress::-webkit-progress-bar{background:#dce5d4;border-radius:20px}progress::-webkit-progress-value{background:#648d59;border-radius:20px}progress::-moz-progress-bar{background:#648d59;border-radius:20px}#storage-status{font-size:11px;color:#71816a;line-height:1.6;margin:11px 0 0}#storage-status.storage-warning{color:#986430}.study-tools{margin-bottom:18px}.tools-top,.tools-bottom{display:flex;align-items:center;justify-content:space-between;gap:17px}.tools-bottom{margin-top:17px;padding-top:17px;border-top:1px solid var(--line)}.category-tabs{display:flex;gap:5px;flex-wrap:wrap}.category-tabs button{padding:11px 15px;border:1px solid transparent;background:transparent;color:#6c7e70;border-radius:9px;font-size:13px;cursor:pointer;min-height:44px}.category-tabs button[aria-pressed=true]{color:#fff;background:var(--green)}.category-tabs span{margin-left:7px;font-size:10px;opacity:.75}.search-box{display:flex;align-items:center;gap:9px;padding:0 13px;background:white;border:1px solid #dce4d9;border-radius:9px;width:310px;min-width:190px}.search-box svg{width:18px;height:18px;color:#7c9080;flex-shrink:0}.search-box:focus-within{outline:2px solid #99b180;outline-offset:2px}.search-box input{font:inherit;font-size:13px;min-width:0;width:100%;height:44px;background:none;border:none;color:var(--ink);outline:none}.search-box input::placeholder{color:#8a978a}.toggle-options{display:flex;flex-wrap:wrap;gap:18px}.toggle-options label{display:flex;align-items:center;gap:6px;font-size:12px;color:#617361;cursor:pointer;min-height:44px}.toggle-options input{width:17px;height:17px;accent-color:var(--green);cursor:pointer}.random-tools{display:flex;gap:12px;align-items:center}.shuffle-button,.plain-button{min-height:44px;cursor:pointer;font-size:12px;border-radius:9px;padding:10px 15px}.shuffle-button{background:#eaf0e3;color:#446244;border:1px solid #d8e2ce;font-weight:600}.shuffle-button:hover{background:#dfe9d5}.shuffle-button:disabled{cursor:default;opacity:.45}.shuffle-button span{font-size:19px;margin-right:5px;line-height:1}.plain-button{border:0;background:transparent;color:#6f8069;text-decoration:underline;text-underline-offset:4px}.results-heading{display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#7a8876;margin:16px 0}.results-heading p{margin:0}.results-heading a{text-decoration:none;padding:8px 0}.card{display:flex;flex-direction:column}.card-content{display:flex;flex-direction:column;flex:1}.word-line{font-size:23px}.meaning{min-height:23px;line-height:1.6}.meaning.hidden-meaning{color:#94a08e;font-size:13px;letter-spacing:2px}.pronunciation-buttons{display:flex;flex-direction:column;gap:8px;margin-top:auto}.mastery-button{display:flex;align-items:center;justify-content:center;gap:8px;min-height:44px;width:100%;font-size:12px;background:none;border:0;color:#81907e;margin-top:9px;border-radius:8px;cursor:pointer}.mastery-button:hover{background:#f3f6ef}.mastery-button[aria-pressed=true]{color:#4c754b;background:#edf3e7}.mastery-icon{display:grid;place-items:center;width:17px;height:17px;border:1.4px solid currentColor;border-radius:50%;font-size:11px}.mastery-button[aria-pressed=true] .mastery-icon{background:#648b56;color:#fff;border-color:#648b56}.card.is-mastered{border-color:#b2c6a7}.empty-state{text-align:center;border:1px dashed #cbd8c1;border-radius:17px;padding:46px 20px;background:#f1f4eb}.empty-state>span{font-size:32px;color:#91a77b}.empty-state h3{font-size:20px;margin:17px 0 10px}.empty-state p{font-size:13px;color:#74836a;line-height:1.7}.empty-state button{margin-top:12px}.audio-status{line-height:1.7;min-height:24px}.word-line span[lang]{overflow-wrap:anywhere}@media(max-width:950px){.category-tabs button{padding:10px 11px}.search-box{width:265px}.word-line{font-size:21px}}@media(max-width:700px){.progress-panel{padding:23px;gap:20px;align-items:stretch;flex-direction:column;margin-bottom:33px}.progress-display{width:100%;max-width:none}.progress-copy h2{font-size:20px}.progress-copy p{font-size:12px}.progress-display strong{font-size:26px}.tools-top{flex-direction:column;align-items:stretch;gap:15px}.category-tabs{justify-content:space-between;gap:4px}.category-tabs button{flex:1;padding:10px 8px;font-size:12px}.category-tabs span{margin-left:4px}.search-box{width:100%}.search-box input{font-size:16px;min-height:46px}.tools-bottom{align-items:stretch;flex-direction:column;gap:7px}.toggle-options{justify-content:space-between;gap:8px}.toggle-options label{font-size:12px}.random-tools{justify-content:flex-end}.word-line{font-size:25px}.mastery-button{min-height:47px;font-size:13px}.progress-panel+.vocabulary-section .section-heading{gap:10px}.section-heading h2{font-size:21px}}