:root{--color-bg:#f4f6f9;--color-card:#fff;--color-primary:#ffe600;--color-cyan:#00f0ff;--color-pink:#ff5376;--color-text-main:#1a1d20;--color-text-muted:#606c7a;--color-border:#1a1d20;--color-green:#0f6;--color-warm:#fffdf0;--border-width:4px;--radius-normal:12px;--radius-pill:999px;--shadow-hard:6px 6px 0px 0px var(--color-border);--shadow-medium:4px 4px 0px 0px var(--color-border);--shadow-small:3px 3px 0px 0px var(--color-border);--shadow-tiny:2px 2px 0px 0px var(--color-border);--shadow-active:2px 2px 0px 0px var(--color-border);--content-max:1200px;--content-narrow:900px}.cyber-page{background:var(--color-bg);min-height:100vh;color:var(--color-text-main);padding:32px 40px;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Helvetica Neue,Microsoft YaHei,sans-serif}.cyber-container{max-width:var(--content-max);margin:0 auto}.cyber-container.narrow{max-width:var(--content-narrow)}@media (max-width:768px){.cyber-page{padding:16px}}.cyber-card{background:var(--color-card);border:var(--border-width) solid var(--color-border);border-radius:var(--radius-normal);box-shadow:var(--shadow-hard);padding:24px;transition:transform .1s,box-shadow .1s;position:relative}.cyber-card.yellow{background:var(--color-primary)}.cyber-card.pink{background:var(--color-pink);color:#fff}.cyber-card.cyan{background:var(--color-cyan)}.cyber-card.interactive:hover{box-shadow:var(--shadow-active);transform:translate(2px,2px)}.cyber-btn{background:var(--color-primary);color:var(--color-text-main);border:var(--border-width) solid var(--color-border);border-radius:var(--radius-normal);box-shadow:var(--shadow-hard);cursor:pointer;-webkit-user-select:none;user-select:none;justify-content:center;align-items:center;gap:6px;padding:12px 24px;font-size:14px;font-weight:900;line-height:1;text-decoration:none;transition:transform .1s,box-shadow .1s;display:inline-flex}.cyber-btn:hover,.cyber-btn:active{box-shadow:var(--shadow-active);transform:translate(2px,2px)}.cyber-btn.pink{background:var(--color-pink);color:#fff}.cyber-btn.cyan{background:var(--color-cyan)}.cyber-btn.white{background:var(--color-card)}.cyber-btn.small{box-shadow:var(--shadow-medium);border-radius:8px;padding:8px 16px;font-size:12px}.cyber-badge{color:var(--color-text-main);background:var(--color-primary);border:3px solid var(--color-border);border-radius:var(--radius-pill);white-space:nowrap;padding:2px 10px;font-size:11px;font-weight:800;display:inline-block}.cyber-badge.pink{background:var(--color-pink);color:#fff}.cyber-badge.cyan{background:var(--color-cyan)}.cyber-badge.white{background:var(--color-card)}.section-title-wrap{border-bottom:var(--border-width) solid var(--color-border);margin-top:40px;margin-bottom:20px;padding-bottom:12px}.section-title{font-size:20px;font-weight:900;display:block}.section-subtitle{color:var(--color-text-muted);letter-spacing:2px;text-transform:uppercase;margin-top:2px;font-size:11px;font-weight:700;display:block}.grid-2{grid-template-columns:1fr 1fr;gap:16px;display:grid}.grid-3{grid-template-columns:1fr 1fr 1fr;gap:16px;display:grid}.grid-4{grid-template-columns:1fr 1fr 1fr 1fr;gap:16px;display:grid}@media (max-width:900px){.grid-3,.grid-4{grid-template-columns:1fr 1fr}}@media (max-width:600px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}.flex-row{align-items:center;gap:10px;display:flex}.flex-between{justify-content:space-between;align-items:center;display:flex}.flex-col{flex-direction:column;display:flex}.cyber-loading{color:var(--color-text-muted);flex-direction:column;align-items:center;padding:80px 0;font-size:14px;display:flex}.cyber-loading:before{content:"";border:4px solid var(--color-border);border-top-color:var(--color-primary);border-radius:50%;width:32px;height:32px;margin-bottom:12px;animation:.8s linear infinite cyber-spin}@keyframes cyber-spin{to{transform:rotate(360deg)}}.cyber-empty{text-align:center;color:var(--color-text-muted);padding:80px 20px}.cyber-empty-icon{margin-bottom:12px;font-size:48px;display:block}.cyber-empty-text{font-size:14px}.cyber-nav{background:var(--color-card);border-bottom:var(--border-width) solid var(--color-border);z-index:100;justify-content:space-between;align-items:center;height:64px;padding:0 40px;display:flex;position:sticky;top:0}.cyber-nav-inner{max-width:var(--content-max);justify-content:space-between;align-items:center;width:100%;margin:0 auto;display:flex}.cyber-nav-logo{color:var(--color-text-main);font-size:20px;font-weight:900;text-decoration:none}.cyber-nav-links{gap:4px;display:flex}.cyber-nav-link{color:var(--color-text-muted);border-radius:var(--radius-pill);border:2px solid #0000;padding:8px 18px;font-size:14px;font-weight:700;text-decoration:none;transition:all .15s}.cyber-nav-link:hover{color:var(--color-text-main);background:var(--color-bg)}.cyber-nav-link.active{color:var(--color-text-main);background:var(--color-primary);border-color:var(--color-border);box-shadow:var(--shadow-small)}@media (max-width:768px){.cyber-nav{padding:0 16px}.cyber-nav-links{gap:2px}.cyber-nav-link{padding:6px 10px;font-size:12px}}.chat-bubble-agent{background:var(--color-card);border:3px solid var(--color-border);box-shadow:var(--shadow-medium);border-radius:4px 20px 20px;padding:14px 18px;font-size:14px;line-height:1.6}.chat-bubble-user{background:var(--color-primary);border:3px solid var(--color-border);box-shadow:var(--shadow-medium);border-radius:20px 4px 20px 20px;padding:14px 18px;font-size:14px;line-height:1.6}.tab-group{flex-wrap:wrap;gap:8px;margin-bottom:24px;display:flex}.tab-pill{border:var(--border-width) solid var(--color-border);border-radius:var(--radius-pill);background:var(--color-card);box-shadow:var(--shadow-medium);cursor:pointer;-webkit-user-select:none;user-select:none;padding:8px 20px;font-size:13px;font-weight:700;transition:all .1s}.tab-pill:hover{background:var(--color-bg)}.tab-pill.active{background:var(--color-primary);box-shadow:var(--shadow-active);transform:translate(2px,2px)}.post-img{border:3px solid var(--color-border);border-radius:var(--radius-normal);box-shadow:var(--shadow-medium);object-fit:cover}.teacher-stamp{background:var(--color-primary);border:3px solid var(--color-border);box-shadow:var(--shadow-small);z-index:2;border-radius:4px;padding:4px 10px;font-size:11px;font-weight:800;position:absolute;top:-8px;right:-8px;transform:rotate(6deg)}.progress-bar{background:var(--color-card);border:3px solid var(--color-border);border-radius:var(--radius-pill);height:12px;overflow:hidden}.progress-fill{background:var(--color-pink);border-radius:var(--radius-pill);height:100%}.two-col{grid-template-columns:1fr 320px;align-items:start;gap:24px;display:grid}@media (max-width:900px){.two-col{grid-template-columns:1fr}.two-col .sidebar{order:-1}}.hero-section{background:var(--color-primary);border:var(--border-width) solid var(--color-border);border-radius:var(--radius-normal);box-shadow:var(--shadow-hard);grid-template-columns:1fr 380px;align-items:center;gap:40px;padding:48px;display:grid}@media (max-width:900px){.hero-section{grid-template-columns:1fr;padding:32px}}