:root{--color-accent: #df0000;--color-accent-hover: #b80000;--color-background: #131313;--color-surface: #2b2b2b;--color-surface-alt: #303030;--color-text: #ffffff;--color-text-secondary: rgba(255, 255, 255, .54);--color-text-muted: #adb5bd;--color-border: rgba(255, 255, 255, .54);--color-border-subtle: rgba(255, 255, 255, .12);--color-nav-bg: rgba(255, 255, 255, .04);--color-nav-border: rgba(255, 255, 255, .08);--color-content-bg: rgba(255, 255, 255, .03);--color-content-border: rgba(255, 255, 255, .08);--color-card-bg: rgba(255, 255, 255, .02);--color-card-border: rgba(255, 255, 255, .12);--color-logo-bg: rgba(255, 255, 255, .03);--color-logo-border: rgba(255, 255, 255, .12);--color-link-text: #d8d8d8;--color-footer-text: #b6c0cc;--color-ruo-bg: rgba(223, 0, 0, .14);--color-ruo-text: #f9d4d4;--body-gradient: radial-gradient(circle at top left, #20232b 0%, #131313 45%, #0e0f12 100%);font-family:Segoe UI,Arial,sans-serif;line-height:1.5;font-weight:400;color:var(--color-text);background-color:var(--color-background)}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--color-text);background:var(--body-gradient)}a{color:inherit;text-decoration:none}.app-shell{min-height:100vh;max-width:1180px;margin:0 auto;display:flex;flex-direction:column;gap:16px;padding:16px}.app-content-blocked{pointer-events:none;-webkit-user-select:none;user-select:none;filter:blur(1px)}.ruo-banner{border:1px solid var(--color-accent);background:var(--color-ruo-bg);color:var(--color-ruo-text);border-radius:10px;padding:10px 14px;display:flex;gap:10px;align-items:center}.ruo-icon{width:22px;height:22px;border-radius:999px;border:1px solid var(--color-accent);display:inline-flex;align-items:center;justify-content:center;font-weight:700}.top-nav{background:var(--color-nav-bg);border:1px solid var(--color-nav-border);border-radius:10px;padding:10px 12px;display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.top-nav-left{display:flex;align-items:center;gap:10px;min-width:0}.brand-logo-link{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--color-logo-border);border-radius:8px;background:var(--color-logo-bg);padding:6px;flex-shrink:0}.brand-logo{display:block;width:34px;height:34px;object-fit:contain}.top-nav-links{display:flex;gap:8px;flex-wrap:wrap}.top-nav-links a{border:1px solid var(--color-border-subtle);background:var(--color-nav-bg);border-radius:8px;padding:6px 10px;font-weight:600;color:var(--color-link-text)}.top-controls{display:flex;gap:8px;flex-wrap:wrap}.lang-switch,.theme-switch{display:flex;gap:6px}.lang-switch button,.theme-switch button{border:1px solid var(--color-border-subtle);background:transparent;color:var(--color-link-text);border-radius:8px;padding:6px 10px;cursor:pointer}.lang-switch button.active,.theme-switch button.active{border-color:var(--color-accent);background:var(--color-accent);color:#fff}.content{flex:1;background:var(--color-content-bg);border:1px solid var(--color-content-border);border-radius:12px;padding:20px}h1{margin:0 0 10px;font-size:clamp(1.3rem,3vw,1.8rem)}h2{margin:0 0 8px;font-size:1.05rem}p{margin:0;color:var(--color-text-muted)}.card-grid{display:grid;grid-template-columns:1fr;gap:12px;margin-top:18px}.card-grid.two-col{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}.card{border:1px solid var(--color-card-border);border-radius:10px;background:var(--color-card-bg);padding:14px}.grade-card.g2{border-color:#f59e0b59;background:#f59e0b14}.primary-btn{display:inline-block;margin-top:12px;border:1px solid var(--color-accent);background:var(--color-accent);color:#fff;border-radius:8px;padding:8px 12px;font-weight:700}.auth-controls{display:flex}.auth-btn{border:1px solid var(--color-accent);background:var(--color-accent);color:#fff;border-radius:8px;padding:6px 10px;cursor:pointer;font-weight:600}.auth-btn:disabled{opacity:.6;cursor:not-allowed}.primary-btn:focus-visible,.auth-btn:focus-visible{outline:2px solid #ffffff;outline-offset:2px}.auth-modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000bd;display:flex;align-items:center;justify-content:center;z-index:999;padding:16px}.auth-modal{width:min(520px,100%);border:1px solid var(--color-content-border);border-radius:12px;background:#16181d;padding:20px;box-shadow:0 10px 40px #00000059}.placeholder-box{margin-top:16px;border:1px dashed var(--color-accent);border-radius:10px;padding:18px}.actions-row{margin-top:14px}.legal-footer{border-top:1px solid var(--color-border-subtle);padding-top:12px;color:var(--color-footer-text);font-size:.92rem}@media(max-width:768px){.app-shell{padding:12px}.top-nav-left{width:100%}.brand-logo{width:30px;height:30px}.content{padding:16px}}