:root{--bg: #f3f5f8;--surface: #ffffff;--text: #1c2430;--muted: #5f6b7a;--border: #d9dee5;--primary: #2459d6;--primary-soft: #e7eefc;--success: #188a4c;--danger: #c62f2f;--warn-bg: #fff6dd;--warn-text: #7a5600;--error-bg: #fdeaea;--radius: 10px;--shadow: 0 2px 12px rgb(20 30 50 / 8%)}*{box-sizing:border-box}html,body{margin:0}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.45}h1{font-size:1.5rem;margin:0 0 .5rem}h2{font-size:1.2rem}h3{font-size:1.05rem;margin:0 0 .5rem}h4{margin:1rem 0 .4rem;font-size:.95rem}.app-header{background:#18212f;color:#fff;display:flex;align-items:center;justify-content:space-between;padding:12px 24px}.app-header .brand{color:#fff;font-weight:700;font-size:1.15rem;text-decoration:none}.app-header nav a{color:#c9d3e2;margin-left:18px;text-decoration:none}.app-header nav a.active,.app-header nav a:hover{color:#fff}.app-main{max-width:1280px;margin:24px auto;padding:0 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