:root{color-scheme:light;--page: #f3ecdf;--paper: #fffdf8;--ink: #191713;--muted: #7d746b;--line: #d8cdbb;--dash: #e2d7c6;--accent: #ad6b18;--soft: #f8f3ec;--chip: #fffaf2;--shadow: 0 8px 24px rgba(76, 54, 28, .08);font-family:Inter,-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,sans-serif}*{box-sizing:border-box}body{margin:0;background:var(--page);color:var(--ink);-webkit-font-smoothing:antialiased}button,input{font:inherit}button:focus-visible,input:focus-visible{outline:2px solid var(--accent);outline-offset:3px}.app-shell{width:min(100%,1480px);margin:0 auto;padding:24px 16px 48px}.study-shell{width:min(100%,760px)}.app-header{padding:20px 4px 22px}.eyebrow{margin:0 0 8px;color:var(--muted);font-size:14px;letter-spacing:.08em}h1{margin:0;font-family:Georgia,Times New Roman,serif;font-size:clamp(44px,13vw,72px);line-height:1;letter-spacing:0}.subhead{margin:12px 0 0;color:var(--muted);line-height:1.6}.toolbar{position:sticky;top:0;z-index:5;display:grid;gap:10px;padding:10px 0 18px;background:color-mix(in srgb,var(--page) 92%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px)}.search-bar{display:grid;gap:6px}.search-bar span{color:var(--muted);font-size:13px}.search-bar input{width:100%;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--ink);padding:12px 16px;outline:none}.segmented-control{display:flex;width:100%;border:1px solid var(--line);border-radius:999px;background:var(--paper);padding:3px}.segmented-control button{flex:1;border:0;border-radius:999px;background:transparent;color:var(--muted);padding:9px 10px;cursor:pointer}.segmented-control button[aria-pressed=true]{background:var(--ink);color:var(--paper)}.card-grid{display:grid;gap:18px}.category-strip{display:flex;gap:8px;margin:0 0 14px;overflow-x:auto;padding:0 0 8px;scrollbar-width:none}.category-strip::-webkit-scrollbar{display:none}.category-strip button{flex:0 0 auto;border:1px solid var(--line);border-radius:999px;background:var(--chip);color:#62594f;padding:9px 13px;cursor:pointer;white-space:nowrap}.category-strip button[aria-pressed=true]{border-color:var(--accent);background:var(--ink);color:var(--paper)}.library-summary{display:flex;flex-wrap:wrap;justify-content:space-between;gap:8px;margin:0 0 16px;color:var(--muted);font-size:14px}.preview-grid{display:grid;gap:16px}.expression-card,.card-face,.card-detail,.preview-card{min-width:0}.card-face,.card-detail,.preview-card{position:relative;border:1px solid var(--line);border-radius:18px;background:var(--paper);box-shadow:var(--shadow)}.card-face{min-height:420px;padding:30px;display:grid;place-items:center}.preview-card{display:grid;min-height:250px;gap:16px;overflow:hidden;padding:24px 24px 20px}.preview-card:before{position:absolute;top:0;bottom:0;left:0;width:5px;background:var(--accent);content:""}.preview-card-top{display:flex;justify-content:space-between;gap:18px}.preview-title-row{display:flex;align-items:center;gap:8px}.preview-card h2{margin:0;font-family:Georgia,Times New Roman,serif;font-size:38px;line-height:1;letter-spacing:0}.preview-audio{width:30px;height:30px;border:0;background:transparent}.preview-chinese{margin:18px 0 0;color:var(--ink);font-size:18px;line-height:1.45}.verb-badge{align-self:start;border-radius:8px;background:#fff3b8;color:#9a5a10;font-family:Georgia,Times New Roman,serif;font-size:16px;font-weight:700;padding:7px 10px;white-space:nowrap}.preview-usage{display:-webkit-box;margin:0;overflow:hidden;color:var(--muted);line-height:1.65;-webkit-box-orient:vertical;-webkit-line-clamp:3}.preview-footer{display:flex;align-items:center;justify-content:space-between;gap:12px;margin-top:auto}.preview-footer span{border:1px solid var(--dash);border-radius:999px;background:var(--chip);color:var(--muted);padding:6px 10px}.text-button,.back-button{border:1px solid var(--line);border-radius:999px;background:var(--paper);color:#62594f;cursor:pointer}.text-button{padding:8px 13px}.back-button{margin:0 0 16px;padding:10px 16px}.study-topbar{display:flex;align-items:center;justify-content:space-between;gap:12px}.study-progress,.swipe-hint{color:var(--muted);font-size:13px}.swipe-hint{margin:14px 0 0;text-align:center}.expression-card{touch-action:pan-y}.card-face-audio{position:absolute;top:28px;right:28px}.card-face-center{text-align:center}.face-label{margin:0 0 18px;color:var(--muted);font-size:13px;letter-spacing:.12em}.card-face h2,.card-detail h2,.spanish-line{font-family:Georgia,Times New Roman,serif;letter-spacing:0}.card-face h2{margin:0;font-size:clamp(48px,15vw,72px);line-height:1}.card-face p,.detail-chinese,.chinese-line{color:var(--muted)}.audio-button{display:inline-flex;width:42px;height:42px;align-items:center;justify-content:center;border:1px solid var(--line);border-radius:999px;background:var(--paper);color:var(--muted);cursor:pointer}.audio-button:hover,.audio-button.is-playing{color:var(--ink);border-color:var(--accent)}.secondary-button{border:1px solid var(--line);border-radius:999px;background:var(--paper);color:#62594f;padding:11px 24px;cursor:pointer}.card-face .secondary-button{position:absolute;bottom:30px}.card-detail{padding:28px 26px}.detail-title{display:flex;align-items:center;gap:14px}.detail-title h2{margin:0;font-size:42px;line-height:1}.detail-chinese{margin:14px 0 0 44px}.source-verb{margin:10px 0 0 44px;color:var(--muted);font-size:14px;line-height:1.5}.source-verb strong{color:var(--ink);font-family:Georgia,Times New Roman,serif;font-size:18px;font-weight:600}.divider{border-top:1px dashed var(--dash);margin:20px 0 14px}.card-detail h3{margin:0 0 8px;color:var(--muted);font-size:13px;letter-spacing:.08em}.usage-text{margin:0;line-height:1.65}.example-list{display:grid;gap:10px}.example-card{display:grid;grid-template-columns:34px 1fr;gap:10px;align-items:start;border-left:4px solid var(--accent);border-radius:0 12px 12px 0;background:var(--soft);padding:14px}.inline-audio{width:30px;height:30px;border:0;background:transparent}.spanish-line{margin:0;font-size:22px}.chinese-line{margin:6px 0 0;font-size:15px}.chunk-list{display:flex;flex-wrap:wrap;gap:8px}.chunk-pill{display:inline-flex;align-items:center;gap:7px;border:1px solid var(--dash);border-radius:999px;background:var(--chip);padding:7px 10px}.chunk-pill small{color:var(--muted)}.chunk-audio{width:24px;height:24px;border:0;background:transparent}.detail-close{margin-top:22px}.site-footer{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:18px;border-top:1px solid var(--line);margin:34px 0 0;padding:24px 4px 0;color:var(--muted);line-height:1.6}.site-footer p{margin:0}.site-footer-title{color:var(--ink);font-family:Georgia,Times New Roman,serif;font-size:24px}.site-footer a{color:var(--accent);text-decoration:none}@media(min-width:720px){.toolbar{grid-template-columns:1fr 300px;align-items:end}.preview-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(min-width:1040px){.preview-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}@media(min-width:1360px){.preview-grid{grid-template-columns:repeat(4,minmax(0,1fr))}}