:root{--brand:#0a6b3c;--brand-dark:#064a2a;--brand-soft:#e9f4ec;--brand-100:#d4e9dc;--gold:#e8a50f;--gold-dark:#c07c08;--gold-soft:#fdf4e0;--red:#d5281b;--red-dark:#b01f14;--red-soft:#fdecea;--bg:#faf7f0;--surface:#ffffff;--surface-2:#f4f1e9;--ink:#20242a;--muted:#667085;--faint:#9aa3ad;--border:#e7e1d7;--grad-hero:linear-gradient(135deg, #052b1a 0%, #0a6b3c 52%, #118a52 100%);--grad-gold:linear-gradient(135deg, #f7c31c 0%, #e8a50f 55%, #c9850a 100%);--grad-red:linear-gradient(135deg, #e5372a 0%, #c0261c 100%);--radius:16px;--radius-lg:24px;--radius-sm:10px;--shadow-sm:0 1px 2px rgba(10, 60, 36, 0.06);--shadow-md:0 10px 26px rgba(10, 60, 36, 0.12);--max-width:1080px;--font-sans:-apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono:"SF Mono", "Monaco", "Inconsolata", "Fira Code", monospace}[data-theme=dark]{--bg:#0b1a12;--surface:#12281c;--surface-2:#1b3828;--ink:#e6efe9;--muted:#a8bdb0;--faint:#7d9386;--border:#274234;--brand:#3fae73;--brand-dark:#5cc087;--brand-soft:#143523;--brand-100:#1b4530;--gold:#e8a50f;--gold-dark:#f0b429;--gold-soft:#2a2410;--red:#e55345;--red-dark:#f07568;--red-soft:#32140f;--shadow-sm:0 1px 2px rgba(0, 0, 0, 0.4);--shadow-md:0 10px 26px rgba(0, 0, 0, 0.45)}*{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:6rem}body{font-family:var(--font-sans);background:var(--bg);color:var(--ink);line-height:1.75;font-size:16px;min-height:100vh;display:flex;flex-direction:column;-webkit-font-smoothing:antialiased}a{color:var(--brand);text-decoration:none;transition:color .15s ease}a:hover{color:var(--brand-dark)}img{max-width:100%;height:auto;border-radius:var(--radius-sm)}.container{width:100%;max-width:var(--max-width);margin:0 auto;padding:0 24px}main{flex:1;padding:40px 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88px;max-width:760px}.hero-badge{display:inline-flex;align-items:center;gap:8px;font-size:.8rem;font-weight:600;letter-spacing:.02em;color:rgba(255,255,255,.85);background:rgba(255,255,255,.1);border-radius:999px;padding:6px 14px}.hero-badge .dot{width:8px;height:8px;border-radius:50%;background:var(--gold)}.hero-deep h1{margin-top:20px;font-size:clamp(2rem,5.5vw,3.4rem);line-height:1.15;font-weight:900;letter-spacing:-.02em;color:#fff}.hero-deep h1 .hl{color:var(--gold)}.hero-deep .hero-sub{margin-top:18px;font-size:1.12rem;line-height:1.7;color:rgba(255,255,255,.82);max-width:620px}.hero-actions{display:flex;gap:12px;margin-top:30px;flex-wrap:wrap}.hero-actions .btn img{border-radius:6px}.hero-stats{display:flex;gap:40px;flex-wrap:wrap;margin-top:34px;padding-top:24px;border-top:1px solid rgba(255,255,255,.16)}.hero-stats .stat{display:flex;flex-direction:column}.hero-stats .stat-num{font-size:30px;font-weight:800;color:var(--gold);line-height:1}.hero-stats 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h1{font-size:clamp(1.7rem,4.5vw,2.5rem);font-weight:900;line-height:1.25;letter-spacing:-.02em;margin-bottom:14px}.article-desc{font-size:1.05rem;color:var(--muted);line-height:1.7;margin-bottom:18px}.article-byline{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:.88rem;color:var(--faint)}.article-byline .author{display:inline-flex;align-items:center;gap:7px;color:var(--ink);font-weight:600}.article-byline .author img{width:26px;height:26px;border-radius:50%;object-fit:cover}.article-content{font-size:1.04rem;overflow-wrap:break-word;word-break:break-word}.article-content h2{font-size:1.5rem;font-weight:800;margin:44px 0 18px;padding-bottom:10px;border-bottom:1px solid var(--border);color:var(--ink)}.article-content h3{font-size:1.22rem;font-weight:700;margin:30px 0 14px;color:var(--ink)}.article-content h4{font-size:1.05rem;font-weight:700;margin:24px 0 12px}.article-content p{margin-bottom:18px}.article-content ul,.article-content ol{margin:18px 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a{color:var(--muted);font-size:.9rem}.footer-links a:hover{color:var(--brand)}.tags-cloud{display:flex;flex-wrap:wrap;gap:12px;margin-top:24px}.tag-lg{padding:10px 18px;border-radius:999px;background:var(--surface);border:1px solid var(--border);color:var(--ink);font-weight:600;font-size:.9rem}.tag-lg:hover{border-color:var(--brand);color:var(--brand)}.search-box{position:relative;margin:0 0 24px}.search-box input{width:100%;padding:14px 18px 14px 46px;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--surface);color:var(--ink);font-size:1rem;font-family:inherit;transition:border-color .15s ease,box-shadow .15s ease}.search-box input::placeholder{color:var(--faint)}.search-box input:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(10,107,60,.15)}.search-box .search-icon{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--faint);pointer-events:none}.search-results{position:absolute;z-index:60;top:calc(100% + 6px);left:0;right:0;list-style:none;margin:0;padding:8px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);box-shadow:var(--shadow-md);max-height:340px;overflow-y:auto}.search-results[hidden]{display:none}.search-results li{margin:0}.search-results a{display:block;padding:10px 12px;border-radius:8px;color:var(--ink)}.search-results a:hover{background:var(--surface-2)}.search-results .st{display:block;font-weight:700;line-height:1.4;margin-bottom:2px}.search-results .ss{display:block;font-size:.85rem;line-height:1.5;color:var(--faint)}.search-results .empty{padding:14px 12px;text-align:center;color:var(--faint);font-size:.9rem}.qq-float{position:fixed;right:20px;bottom:24px;z-index:200;display:flex;flex-direction:column;align-items:flex-end;padding-top:12px}.qq-card{position:absolute;right:0;bottom:100%;background:var(--surface);border:1px solid var(--border);border-radius:16px;box-shadow:var(--shadow-md);padding:18px 22px;width:min(320px,calc(100vw 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24px;border-radius:999px;background:var(--brand);color:#fff;font-size:1rem;font-weight:700;font-family:inherit;box-shadow:0 8px 24px rgba(10,107,60,.4);transition:transform .2s ease,box-shadow .2s ease}.qq-btn:hover{transform:translateY(-2px);box-shadow:0 12px 28px rgba(10,107,60,.5);color:#fff}.qq-btn svg{width:26px;height:26px;flex-shrink:0}.back-to-top{position:fixed;right:20px;bottom:92px;z-index:190;width:44px;height:44px;border-radius:50%;border:1px solid var(--border);background:var(--surface);color:var(--brand);display:flex;align-items:center;justify-content:center;cursor:pointer;padding:0;box-shadow:var(--shadow-md);opacity:0;visibility:hidden;transform:translateY(8px);transition:opacity .25s ease,transform .25s ease,visibility .25s ease}.back-to-top.show{opacity:1;visibility:visible;transform:translateY(0)}.back-to-top:hover{background:var(--brand);color:#fff;border-color:var(--brand)}.back-to-top svg{width:20px;height:20px}@media(max-width:640px){.site-header .container{height:56px}.main-nav{gap:0}.main-nav a{padding:6px 9px;font-size:.85rem}.hero-inner{padding:48px 0 72px}.hero-actions{display:grid;grid-template-columns:1fr 1fr}.hero-actions .btn:first-child{grid-column:1/-1}.article-card{padding:22px}.site-footer .container{flex-direction:column;text-align:center}.qq-float{right:14px;bottom:16px}.qq-btn{padding:10px 18px;font-size:.9rem}.qq-btn svg{width:22px;height:22px}.back-to-top{right:14px;bottom:76px}}@media(min-width:900px){.article-layout{display:grid;grid-template-columns:minmax(0,1fr)260px;gap:40px;align-items:start}.toc-sidebar{display:block;position:sticky;top:88px}.toc-mobile{display:none}.cta-grid{grid-template-columns:1fr 1fr}.related-grid{grid-template-columns:repeat(2,1fr)}.subtopic-grid{grid-template-columns:repeat(2,1fr)}.article-list.grid-3{grid-template-columns:repeat(3,1fr)}.article-list.grid-2{grid-template-columns:repeat(2,1fr)}}@media(prefers-reduced-motion:reduce){*{animation-duration:.01ms!important;transition-duration:.01ms!important}}.tools-header{margin:20px 0 28px}.tools-header h1{font-size:clamp(1.7rem,4vw,2.2rem);font-weight:900;letter-spacing:-.02em;margin-bottom:10px}.tools-header p{color:var(--muted);font-size:1.02rem;max-width:680px;line-height:1.7}.tools-desc{color:var(--muted);font-size:1.02rem;max-width:680px;line-height:1.7}.tools-grid{display:grid;gap:16px;grid-template-columns:1fr}.tool-card{display:flex;gap:18px;align-items:flex-start;padding:24px 26px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--ink);transition:all .15s ease}.tool-card:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-md);color:var(--ink)}.tool-icon{flex:none;width:52px;height:52px;border-radius:14px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;font-size:1.6rem}.tool-card-body h2{font-size:1.15rem;font-weight:800;margin-bottom:6px;color:var(--ink)}.tool-card-body p{font-size:.9rem;color:var(--muted);line-height:1.6}.tool-cta{display:inline-block;margin-top:10px;font-weight:700;font-size:.9rem;color:var(--brand)}.home-tools-grid{display:grid;gap:14px;grid-template-columns:1fr}.home-tool-card{display:flex;align-items:center;gap:14px;padding:18px 20px;border:1px solid var(--border);border-radius:var(--radius);background:var(--surface);color:var(--ink);transition:all .15s ease}.home-tool-card:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-sm);color:var(--ink)}.home-tool-icon{flex:none;width:44px;height:44px;border-radius:12px;background:var(--brand-soft);display:flex;align-items:center;justify-content:center;font-size:1.35rem}.home-tool-body{display:flex;flex-direction:column;gap:3px;min-width:0}.home-tool-name{font-weight:700;font-size:1rem;color:var(--ink)}.home-tool-summary{font-size:.85rem;color:var(--muted);line-height:1.5}.calc-wrap{margin:8px 0 24px;border:1px solid var(--border);border-radius:var(--radius-lg);background:var(--surface);box-shadow:var(--shadow-sm);overflow:hidden}.calc-grid{display:grid;gap:0;grid-template-columns:1fr}.calc-form{padding:26px 28px}.calc-form .form-group{margin-bottom:18px}.calc-form label{display:block;font-weight:700;color:var(--ink);font-size:.9rem;margin-bottom:6px}.calc-form .hint{display:block;font-size:.8rem;color:var(--faint);margin-top:5px}.calc-form input[type=number],.calc-form select{width:100%;padding:12px 14px;border:2px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);color:var(--ink);font-size:1rem;font-family:inherit;transition:border-color .15s ease,box-shadow .15s ease}.calc-form input:focus,.calc-form select:focus{outline:none;border-color:var(--brand);box-shadow:0 0 0 3px rgba(10,107,60,.15)}.calc-form .form-row{display:grid;gap:14px;grid-template-columns:1fr}.calc-actions{display:flex;gap:12px;flex-wrap:wrap;margin-top:4px}.calc-actions .btn{width:100%}.calc-results{padding:26px 28px;background:var(--surface-2);border-left:1px solid var(--border)}.result-grid{display:grid;gap:12px;grid-template-columns:repeat(2,1fr)}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-sm);padding:15px 17px}.stat-card.hl{border-color:var(--gold);background:var(--gold-soft)}.stat-label{font-size:.78rem;color:var(--muted)}.stat-value{font-size:1.35rem;font-weight:800;color:var(--ink);margin-top:2px;line-height:1.25;word-break:break-all}.stat-value.pos{color:var(--brand)}.stat-value.neg{color:var(--red)}.stat-sub{font-size:.76rem;color:var(--faint);margin-top:2px}.calc-chart{padding:10px 20px 24px}.calc-chart svg{width:100%;height:auto;display:block}.calc-chart .chart-legend{display:flex;gap:18px;flex-wrap:wrap;margin-bottom:8px;font-size:.82rem;color:var(--muted)}.calc-chart .chart-legend span{display:inline-flex;align-items:center;gap:6px}.calc-chart .legend-dot{width:10px;height:10px;border-radius:50%;display:inline-block}@media(min-width:900px){.tools-grid{grid-template-columns:repeat(2,1fr)}.home-tools-grid{grid-template-columns:repeat(3,1fr)}.calc-grid{grid-template-columns:minmax(0,360px)minmax(0,1fr)}.calc-form .form-row{grid-template-columns:1fr 1fr}.calc-actions .btn{width:auto}}