/* ============================================ AI 学习与交流 — site styles One hue family (~155°): every neutral is a tint of the green. Sharp edges, no radius. ============================================ */ :root { --paper: #F9FBFA; --card: #FFFFFF; --wash: #EFF3F1; --ink: #222926; --ink-body: #414B46; --ink-soft: #626D68; --line: #D3DBD6; --accent: #2E5C4A; --accent-deep: #23483A; --accent-tint: #E8F0EC; /* Noto is loaded non-blocking from Google Fonts in each page's . When it can't be reached (e.g. mainland China) the page simply keeps the system fonts listed after it. */ --serif: "Noto Serif SC", Georgia, "Songti SC", "STSong", "Noto Serif CJK SC", "Source Han Serif SC", "SimSun", serif; --sans: "Noto Sans SC", -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans CJK SC", "Source Han Sans SC", "Helvetica Neue", Arial, sans-serif; --mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace; } * { box-sizing: border-box; } html { scroll-behavior: smooth; } body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); font-size: 16px; line-height: 1.8; -webkit-font-smoothing: antialiased; } /* Language switching: html[data-lang] decides which copy is visible */ [data-lang="zh"] .en { display: none !important; } [data-lang="en"] .zh { display: none !important; } h1, h2, h3 { font-family: var(--serif); font-weight: 600; line-height: 1.35; margin: 0; } a { color: var(--accent); text-decoration: none; } a:hover { color: var(--accent-deep); } .container { max-width: 1060px; margin: 0 auto; padding: 0 24px; } :focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; } .skip-link { position: absolute; left: -9999px; top: 0; z-index: 100; background: var(--ink); color: #fff; padding: 8px 16px; } .skip-link:focus { left: 0; color: #fff; } /* ---------- Header ---------- */ .site-header { position: sticky; top: 0; z-index: 50; background: rgba(249, 251, 250, 0.92); backdrop-filter: blur(8px); -webkit-backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); } .header-inner { display: flex; align-items: center; gap: 28px; padding-top: 14px; padding-bottom: 14px; } .brand { display: flex; align-items: center; color: var(--ink); } .brand:hover { color: var(--ink); } .brand-name { font-family: var(--serif); font-size: 18px; font-weight: 700; letter-spacing: 0.06em; } .site-nav { display: flex; gap: 22px; margin-left: auto; } .site-nav a { color: var(--ink-soft); font-size: 15px; padding: 4px 2px; border-bottom: 2px solid transparent; } .site-nav a:hover { color: var(--ink); } .site-nav a.active { color: var(--accent); border-bottom-color: var(--accent); font-weight: 500; } .header-actions { display: flex; align-items: center; gap: 10px; } .lang-toggle { font-family: var(--sans); font-size: 13px; letter-spacing: 0.05em; border: 1px solid var(--line); background: var(--card); color: var(--ink-soft); padding: 5px 13px; cursor: pointer; } .lang-toggle:hover { border-color: var(--accent); color: var(--accent); } .nav-toggle { display: none; border: 1px solid var(--line); background: var(--card); padding: 5px 11px; cursor: pointer; font-size: 16px; color: var(--ink); } /* ---------- Hero (home) ---------- */ .hero { padding: 88px 0 64px; } .hero-title { font-size: clamp(38px, 6vw, 60px); letter-spacing: 0.05em; color: var(--ink); font-weight: 600; } .hero-lede { max-width: 34em; margin: 22px 0 34px; font-size: 17px; color: var(--ink-soft); } .hero-actions { display: flex; gap: 14px; flex-wrap: wrap; } .btn { display: inline-block; padding: 11px 26px; font-size: 15px; font-weight: 500; letter-spacing: 0.04em; transition: background 0.15s ease, color 0.15s ease, border-color 0.15s ease; } .btn-primary { background: var(--accent); color: #fff; border: 1px solid var(--accent); } .btn-primary:hover { background: var(--accent-deep); border-color: var(--accent-deep); color: #fff; } .btn-ghost { border: 1px solid var(--accent); color: var(--accent); background: transparent; } .btn-ghost:hover { background: var(--accent-tint); color: var(--accent-deep); } /* Page-load rise, one orchestrated moment */ @keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } } .hero-main > * { animation: rise 0.55s ease both; } .hero-main > *:nth-child(2) { animation-delay: 0.06s; } .hero-main > *:nth-child(3) { animation-delay: 0.12s; } .hero-main > *:nth-child(4) { animation-delay: 0.18s; } /* ---------- Sections ---------- */ .section { padding: 64px 0; } .section-head { display: flex; align-items: baseline; justify-content: space-between; gap: 16px; margin-bottom: 34px; flex-wrap: wrap; } .section-title { font-size: 30px; letter-spacing: 0.04em; } /* Section cards (home) */ .dept-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; } .dept-card { display: block; background: var(--card); border: 1px solid var(--line); padding: 28px; color: var(--ink); transition: border-color 0.15s ease; } .dept-card:hover { border-color: var(--accent); color: var(--ink); } .glyph { display: inline-flex; align-items: center; justify-content: center; width: 46px; height: 46px; border: 1px solid var(--accent); font-family: var(--serif); font-size: 23px; font-weight: 600; color: var(--accent); transition: background 0.15s ease, color 0.15s ease; } .dept-card:hover .glyph { background: var(--accent); color: var(--card); } .dept-card h3 { font-size: 20px; margin: 18px 0 8px; } .dept-card p { margin: 0 0 16px; font-size: 15px; color: var(--ink-soft); } .card-link { font-size: 14px; color: var(--accent); font-weight: 500; } /* ---------- Subpage head ---------- */ .page-head { padding: 64px 0 24px; } .page-head .glyph { width: 54px; height: 54px; font-size: 27px; margin-bottom: 20px; } .page-title { font-size: clamp(32px, 5vw, 44px); letter-spacing: 0.06em; } .page-lede { max-width: 42em; margin: 16px 0 0; font-size: 16.5px; color: var(--ink-soft); } /* ---------- Placeholder panel ---------- */ .note-panel { margin-top: 28px; background: var(--wash); border: 1px solid var(--line); border-left: 2px solid var(--accent); padding: 22px 26px; font-size: 15px; color: var(--ink-soft); } .note-panel p { margin: 0; } /* ---------- Fields ---------- */ .field-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; } .field-card { background: var(--card); border: 1px solid var(--line); padding: 26px; } .field-card h3 { font-size: 19px; margin-bottom: 8px; } .field-card > p { margin: 0 0 16px; font-size: 15px; color: var(--ink-soft); } .start-list { padding: 14px 18px; background: var(--wash); border-left: 2px solid var(--accent); font-size: 14px; } .start-list-title { display: block; font-size: 12px; letter-spacing: 0.16em; color: var(--accent); margin-bottom: 6px; font-weight: 500; text-transform: uppercase; } .start-list ul { margin: 0; padding-left: 18px; color: var(--ink-soft); } .start-list li { margin: 3px 0; } /* ---------- Prose (about) ---------- */ .prose { max-width: 46em; padding-bottom: 24px; } .prose h2 { font-size: 24px; margin: 46px 0 14px; } .prose p { margin: 0 0 14px; color: var(--ink-body); font-size: 15.5px; } .prose ul { margin: 0 0 14px; padding-left: 20px; color: var(--ink-body); font-size: 15.5px; } .prose li { margin: 6px 0; } /* ---------- Footer ---------- */ .site-footer { border-top: 1px solid var(--line); padding: 44px 0 36px; } .footer-grid { display: flex; justify-content: space-between; align-items: flex-start; gap: 24px; flex-wrap: wrap; } .footer-brand { display: flex; align-items: center; gap: 10px; font-family: var(--serif); font-weight: 700; letter-spacing: 0.08em; font-size: 18px; } .footer-tagline { margin: 10px 0 0; font-size: 13.5px; color: var(--ink-soft); } .footer-nav { display: flex; gap: 18px; flex-wrap: wrap; } .footer-nav a { font-size: 14px; color: var(--ink-soft); } .footer-nav a:hover { color: var(--accent); } /* ---------- Entry listings (courses / news / Q&A) ---------- */ .entry-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; } .entry-card { display: block; background: var(--card); border: 1px solid var(--line); padding: 24px 26px; color: var(--ink); transition: border-color 0.15s ease; } .entry-card:hover { border-color: var(--accent); color: var(--ink); } .entry-card h3 { font-size: 18px; margin-bottom: 8px; } .entry-card p { margin: 0 0 12px; font-size: 15px; color: var(--ink-soft); } .entry-meta { font-size: 13px; color: var(--ink-soft); letter-spacing: 0.04em; } .news-list { border-top: 1px solid var(--line); } .news-entry { padding: 22px 0; border-bottom: 1px solid var(--line); } .news-entry .entry-meta { display: block; margin-bottom: 6px; } .news-entry h3 { font-size: 19px; margin-bottom: 6px; } .news-entry h3 a { color: var(--ink); } .news-entry h3 a:hover { color: var(--accent); } .news-entry p { margin: 0; font-size: 15px; color: var(--ink-body); max-width: 46em; } .qa-list { border-top: 1px solid var(--line); } .qa-item { border-bottom: 1px solid var(--line); } .qa-item summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; align-items: baseline; gap: 16px; padding: 18px 0; font-size: 17px; font-weight: 600; color: var(--ink); } .qa-item summary::-webkit-details-marker { display: none; } .qa-item summary:hover { color: var(--accent); } .qa-item summary::after { content: "+"; flex-shrink: 0; font-weight: 400; color: var(--ink-soft); } .qa-item[open] summary::after { content: "\2212"; } .qa-answer { padding: 0 0 20px; } .qa-answer p { margin: 0 0 10px; font-size: 15px; color: var(--ink-body); max-width: 46em; } .qa-answer p:last-child { margin-bottom: 0; } /* ---------- Article page ---------- */ .post { max-width: 46em; padding: 56px 0 64px; } .post-meta { margin: 0 0 14px; font-size: 13px; letter-spacing: 0.06em; color: var(--ink-soft); } .post-title { font-size: clamp(28px, 4.5vw, 38px); letter-spacing: 0.02em; } .post-lede { margin: 14px 0 0; font-size: 16.5px; color: var(--ink-soft); } .post-body { margin-top: 36px; padding-top: 32px; border-top: 1px solid var(--line); font-size: 16px; color: var(--ink-body); } .post-body h2 { font-size: 22px; margin: 40px 0 12px; color: var(--ink); } .post-body h3 { font-size: 18px; margin: 28px 0 10px; color: var(--ink); } .post-body h2:first-child, .post-body h3:first-child { margin-top: 0; } .post-body p { margin: 0 0 16px; } .post-body ul, .post-body ol { margin: 0 0 16px; padding-left: 22px; } .post-body li { margin: 4px 0; } .post-body blockquote { margin: 20px 0; padding: 4px 0 4px 18px; border-left: 2px solid var(--accent); color: var(--ink-soft); } .post-body blockquote p:last-child { margin-bottom: 0; } .post-body code { font-family: var(--mono); font-size: 0.92em; background: var(--wash); padding: 1px 5px; } .post-body pre { margin: 0 0 18px; padding: 16px 18px; background: var(--wash); border: 1px solid var(--line); overflow-x: auto; font-size: 14px; line-height: 1.6; } .post-body pre code { background: none; padding: 0; font-size: inherit; } .post-body img { max-width: 100%; height: auto; display: block; border: 1px solid var(--line); } .post-body figure { margin: 20px 0; } .post-body figcaption { margin-top: 8px; font-size: 13.5px; color: var(--ink-soft); } .post-body table { width: 100%; border-collapse: collapse; margin: 0 0 18px; font-size: 15px; } .post-body th, .post-body td { border: 1px solid var(--line); padding: 8px 12px; text-align: left; vertical-align: top; } .post-body th { background: var(--wash); font-weight: 600; } .post-body hr { border: 0; border-top: 1px solid var(--line); margin: 32px 0; } .post-back { display: inline-block; margin-top: 40px; font-size: 14px; } /* Added by assets/article.js */ .post-toc { margin: 0 0 28px; padding: 14px 18px; background: var(--wash); border-left: 2px solid var(--accent); font-size: 14px; } .post-toc-title { display: block; font-weight: 600; margin-bottom: 6px; color: var(--ink); } .post-toc ol { margin: 0; padding-left: 20px; } .post-toc li { margin: 3px 0; } .post-toc .toc-h3 { list-style: none; padding-left: 12px; } .post-body h2 .anchor, .post-body h3 .anchor { margin-left: 8px; font-weight: 400; color: var(--ink-soft); opacity: 0; } .post-body h2:hover .anchor, .post-body h3:hover .anchor, .post-body .anchor:focus { opacity: 1; } .post-body pre { position: relative; } .copy-btn { position: absolute; top: 8px; right: 8px; font: 12px var(--sans); padding: 3px 9px; border: 1px solid var(--line); background: var(--card); color: var(--ink-soft); cursor: pointer; } .copy-btn:hover { border-color: var(--accent); color: var(--accent); } /* Prev / next lecture links */ .post-nav { display: flex; justify-content: space-between; gap: 16px; margin-top: 40px; padding-top: 20px; border-top: 1px solid var(--line); font-size: 14px; } .post-nav .post-next { margin-left: auto; text-align: right; } /* ---------- Report charts and stat tiles (reports/) ---------- */ :root { --chart-1: #2E8A63; } .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; margin: 0 0 32px; } .stat { border: 1px solid var(--line); background: var(--card); padding: 16px 18px; } .stat-value { display: block; font-family: var(--sans); font-size: 30px; font-weight: 600; line-height: 1.2; color: var(--ink); } .stat-label { display: block; margin-top: 6px; font-size: 13.5px; color: var(--ink-soft); line-height: 1.5; } .chart { margin: 28px 0 36px; } .chart figcaption { margin-bottom: 12px; } .chart-title { display: block; font-weight: 600; color: var(--ink); font-size: 15.5px; } .chart-note { display: block; margin-top: 2px; font-size: 13px; color: var(--ink-soft); } .bars { list-style: none; margin: 0; padding: 0; } .bar-row { display: grid; grid-template-columns: minmax(0, 42%) minmax(0, 1fr) 72px; align-items: center; gap: 12px; padding: 5px 0; font-size: 14px; } .bar-label { color: var(--ink-body); line-height: 1.4; } .bar-track { display: block; height: 14px; background: var(--wash); } .bar-fill { display: block; height: 100%; background: var(--chart-1); } .bar-value { color: var(--ink-soft); font-variant-numeric: tabular-nums; white-space: nowrap; text-align: right; font-size: 13px; } .chart-rest { margin: 8px 0 0; font-size: 13px; color: var(--ink-soft); } .chart-data { margin-top: 8px; font-size: 13px; } .chart-data summary { cursor: pointer; color: var(--accent); } .chart-data table { width: 100%; border-collapse: collapse; margin-top: 8px; } .chart-data th, .chart-data td { border: 1px solid var(--line); padding: 5px 10px; text-align: left; } .chart-data td:nth-child(n+2), .chart-data th:nth-child(n+2) { text-align: right; font-variant-numeric: tabular-nums; } .chart-data th { background: var(--wash); font-weight: 600; } .report-body .stat-grid + h2 { margin-top: 32px; } @media (max-width: 860px) { .stat-grid { grid-template-columns: repeat(2, 1fr); } } @media (max-width: 600px) { .bar-row { grid-template-columns: minmax(0, 1fr) 72px; } .bar-label { grid-column: 1 / -1; padding-top: 4px; } } /* ---------- Print ---------- */ @media print { .site-header, .site-footer, .skip-link, .copy-btn, .post-toc, .post-nav, .post-back, .anchor, .hero-actions { display: none !important; } body { background: #fff; color: #000; font-size: 12pt; } .post { max-width: none; padding: 0; } .post-body { border-top: none; padding-top: 0; } .post-body pre { border: 1px solid #999; page-break-inside: avoid; } .post-body img { border: none; } .bar-fill { -webkit-print-color-adjust: exact; print-color-adjust: exact; } .chart-data { display: none; } a { color: inherit; text-decoration: underline; } } /* ---------- Responsive ---------- */ @media (max-width: 860px) { .site-nav { display: none; position: absolute; top: 100%; left: 0; right: 0; background: var(--paper); border-bottom: 1px solid var(--line); flex-direction: column; gap: 0; padding: 8px 24px 16px; } .site-header.nav-open .site-nav { display: flex; } .site-nav a { padding: 10px 0; border-bottom: none; font-size: 16px; } .nav-toggle { display: inline-flex; } .hero { padding: 56px 0 48px; } .dept-grid, .field-grid, .entry-grid { grid-template-columns: 1fr; } .section { padding: 48px 0; } .section-title { font-size: 25px; } .page-head { padding: 48px 0 16px; } .post { padding: 40px 0 48px; } } @media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } *, *::before, *::after { animation-duration: 0.001s !important; animation-delay: 0s !important; transition-duration: 0.001s !important; } }