:root{--color-primary: #0b4f7a;--color-primary-dark: #082b40;--color-primary-light: #237aa8;--color-accent: #b9812a;--color-accent-soft: #f3eadb;--color-steel: #3f6f7f;--color-text: #142131;--color-text-secondary: #536171;--color-text-muted: #8793a2;--color-bg: #ffffff;--color-bg-alt: #f5f8fb;--color-bg-dark: #071b29;--color-surface: #fbfcfe;--color-surface-raised: #ffffff;--color-border: #dfe7ef;--color-white: #ffffff;--shadow-sm: 0 1px 2px rgba(8, 43, 64, .05), 0 8px 20px rgba(8, 43, 64, .06);--shadow-md: 0 16px 36px rgba(8, 43, 64, .1);--shadow-lg: 0 24px 58px rgba(8, 43, 64, .15);--radius-sm: 6px;--radius-md: 8px;--radius-lg: 8px;--header-height: 76px;--container-max: 1360px;--font-sans: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;--font-display: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;--font-mono: "SF Mono", "JetBrains Mono", "Fira Code", Consolas, "Liberation Mono", Menlo, monospace;--text-xs: .75rem;--text-sm: .8125rem;--text-base: .9375rem;--text-md: 1rem;--text-lg: 1.125rem;--text-xl: 1.25rem;--text-2xl: 1.5rem;--text-3xl: 1.875rem;--text-4xl: 2.25rem;--leading-none: 1;--leading-tight: 1.25;--leading-snug: 1.4;--leading-normal: 1.6;--leading-relaxed: 1.75;--leading-loose: 2;--tracking-tighter: 0;--tracking-tight: 0;--tracking-normal: 0;--tracking-wide: 0;--tracking-wider: 0;--weight-normal: 400;--weight-medium: 500;--weight-semibold: 600;--weight-bold: 700;--weight-extrabold: 800}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;font-size:16px}body{font-family:var(--font-sans);font-size:var(--text-md);line-height:var(--leading-normal);color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;-webkit-text-size-adjust:100%;font-feature-settings:"kern" 1,"liga" 1,"calt" 1,"pnum" 1;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-display);color:var(--color-text);line-height:var(--leading-tight);letter-spacing:var(--tracking-tight);font-weight:var(--weight-bold)}h1{font-size:var(--text-4xl);font-weight:var(--weight-extrabold)}h2{font-size:var(--text-3xl)}h3{font-size:var(--text-2xl)}h4{font-size:var(--text-xl)}h5{font-size:var(--text-lg)}h6{font-size:var(--text-md);font-weight:var(--weight-semibold)}p{line-height:var(--leading-relaxed)}small{font-size:var(--text-sm)}strong,b{font-weight:var(--weight-semibold);color:var(--color-text)}a{color:inherit;text-decoration:none;transition:color .2s ease}img{max-width:100%;height:auto;display:block}ul,ol{list-style:none}button{font-family:inherit;cursor:pointer;border:none;background:none}input,textarea,select{font-family:inherit;font-size:var(--text-md)}::selection{background:#0d4f7c1f;color:var(--color-primary-dark)}.container{width:100%;max-width:var(--container-max);margin:0 auto;padding:0 24px}.section{padding:88px 0}.section-alt{background:linear-gradient(180deg,#f5f8fbeb,#fff0),var(--color-bg-alt)}.section-title{font-family:var(--font-display);font-size:2rem;font-weight:var(--weight-extrabold);letter-spacing:var(--tracking-tight);line-height:var(--leading-tight);color:var(--color-text);margin-bottom:10px}.section-subtitle{font-size:var(--text-base);font-weight:var(--weight-normal);letter-spacing:var(--tracking-wide);line-height:var(--leading-relaxed);color:var(--color-text-secondary);margin-bottom:46px;max-width:680px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:10px 24px;font-size:var(--text-base);font-weight:var(--weight-semibold);letter-spacing:var(--tracking-wide);border-radius:var(--radius-sm);transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease}.btn-primary{background:linear-gradient(180deg,var(--color-primary-light) 0%,var(--color-primary) 100%);color:var(--color-white);box-shadow:0 12px 24px #0b4f7a2e}.btn-primary:hover{background:var(--color-primary-dark);transform:translateY(-1px);box-shadow:0 16px 32px #082b4038}.btn-outline{border:1px solid rgba(11,79,122,.34);color:var(--color-primary);background:#ffffffb3}.btn-outline:hover{background:var(--color-primary);color:var(--color-white)}.btn-ghost{color:var(--color-primary);min-height:40px;padding:8px 16px}.btn-ghost:hover{background:#0b4f7a14}.card{background:linear-gradient(180deg,var(--color-surface-raised) 0%,var(--color-surface) 100%);border-radius:var(--radius-md);box-shadow:0 1px #ffffffdb inset;border:1px solid rgba(216,226,236,.92);overflow:hidden;transition:border-color .25s ease,box-shadow .25s ease,transform .25s ease}.card:hover{box-shadow:var(--shadow-md);transform:translateY(-2px);border-color:#0b4f7a33}.rich-content{color:var(--color-text-secondary);font-size:var(--text-md);line-height:var(--leading-loose);letter-spacing:var(--tracking-normal);word-break:break-word}.rich-content>:first-child{margin-top:0}.rich-content>:last-child{margin-bottom:0}.rich-content img{display:block;max-width:100%;height:auto;border-radius:var(--radius-sm);margin:24px auto}.rich-content p{margin-bottom:16px;line-height:var(--leading-loose);text-indent:2em}.rich-content h1,.rich-content h2,.rich-content h3,.rich-content h4{color:var(--color-primary-dark);line-height:var(--leading-snug);letter-spacing:var(--tracking-tight);margin:32px 0 14px;font-weight:var(--weight-bold)}.rich-content h1{font-size:1.875rem;font-weight:var(--weight-extrabold)}.rich-content h2{font-size:1.5rem}.rich-content h3{font-size:1.2rem}.rich-content h4{font-size:1.0625rem}.rich-content ul,.rich-content ol{margin:0 0 16px;padding-left:22px}.rich-content li{line-height:var(--leading-relaxed)}.rich-content li+li{margin-top:8px}.rich-content a{color:var(--color-primary);text-decoration:underline;text-underline-offset:2px;transition:color .2s}.rich-content a:hover{color:var(--color-primary-light)}.rich-content blockquote{margin:24px 0;padding:16px 24px;border-left:3px solid var(--color-primary);background:#0f4c810a;border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--color-text-secondary);font-style:normal}.rich-content table{width:100%;border-collapse:collapse;margin:24px 0;overflow:hidden;font-size:var(--text-base)}.rich-content th,.rich-content td{padding:12px 16px;border:1px solid var(--color-border);text-align:left;line-height:var(--leading-snug)}.rich-content th{background:var(--color-bg-alt);color:var(--color-primary-dark);font-weight:var(--weight-semibold);font-size:var(--text-sm);letter-spacing:var(--tracking-wide)}.rich-content pre,.rich-content code{font-family:var(--font-mono)}.rich-content pre{padding:18px 20px;margin:24px 0;overflow-x:auto;border-radius:var(--radius-sm);background:#0f172a;color:#e2e8f0;font-size:var(--text-sm);line-height:var(--leading-relaxed)}.rich-content code{padding:2px 6px;border-radius:4px;background:#0f4c8114;font-size:.875em}.empty-state{text-align:center;padding:60px 24px;color:var(--color-text-muted);font-size:var(--text-base)}.loading-state{text-align:center;padding:60px 24px;color:var(--color-text-secondary);font-size:var(--text-base)}@media(max-width:768px){html{font-size:15px}.section{padding:64px 0}.section-title{font-size:1.55rem}.section-subtitle{font-size:var(--text-sm);margin-bottom:32px}.container{padding:0 16px}.rich-content{font-size:var(--text-base)}}