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12px;display:flex}.theme-preview-dot{border-radius:50%;width:10px;height:10px}.theme-preview-body{flex-direction:column;gap:4px;height:48px;padding:8px 12px;display:flex}.theme-preview-line{opacity:.6;border-radius:3px;height:6px}.theme-preview-label{text-align:center;padding:8px;font-size:11px;font-weight:700}.how-section{text-align:center;max-width:1000px;margin:0 auto;padding:80px 24px}.how-section h2{color:var(--text-primary);margin-bottom:40px;font-size:32px;font-weight:800}.how-steps{grid-template-columns:repeat(4,1fr);gap:20px;display:grid}.how-step{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-lg);text-align:center;box-shadow:var(--shadow-md);padding:30px 20px;transition:all .3s;position:relative}.how-step:hover{border-color:var(--accent-primary);box-shadow:var(--shadow-lg),0 0 15px var(--glow-color);transform:translateY(-5px)}.step-num{background:var(--accent-gradient);color:#fff;width:40px;height:40px;box-shadow:0 4px 12px var(--glow-strong);border-radius:50%;justify-content:center;align-items:center;margin:0 auto 20px;font-size:18px;font-weight:800;display:flex}.step-content h3{color:var(--text-primary);margin-bottom:10px;font-size:16px;font-weight:700}.step-content p{color:var(--text-muted);font-size:13px;line-height:1.6}.features-section{text-align:center;max-width:1100px;margin:0 auto;padding:100px 24px}.features-section .section-label{color:var(--accent-primary);text-transform:uppercase;letter-spacing:1px;margin-bottom:12px;font-size:13px;font-weight:700}.features-section h2{color:var(--text-primary);margin-bottom:16px;font-size:42px;font-weight:800}.features-section .sub{color:var(--text-secondary);max-width:600px;margin:0 auto 48px;font-size:16px;line-height:1.6}.features-grid{grid-template-columns:repeat(3,1fr);gap:24px;display:grid}.feature-card{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-lg);text-align:left;padding:32px 24px;transition:all .3s}.feature-card:hover{border-color:var(--border-focus);box-shadow:var(--shadow-lg);transform:translateY(-5px)}.feature-icon{border-radius:12px;justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:20px;display:flex}.feature-icon svg{width:24px;height:24px}.feature-card h3{color:var(--text-primary);margin-bottom:12px;font-size:18px;font-weight:700}.feature-card p{color:var(--text-secondary);font-size:14px;line-height:1.6}@media (max-width:768px){.navbar{padding:0 16px}.nav-links{display:none}.theme-picker-grid{grid-template-columns:repeat(2,1fr)}.tutorial-card-wide{width:90vw!important;max-width:90vw!important}.hero h1{font-size:36px}.features-grid{grid-template-columns:1fr}.how-steps{grid-template-columns:1fr;gap:16px}.stats-row,.stats-grid{grid-template-columns:repeat(2,1fr)}.progress-row{grid-template-columns:1fr;justify-items:center}.sidebar{display:none}.admin-main{margin-left:0;padding:24px 16px}.metric-grid{grid-template-columns:repeat(2,1fr)}.chart-row{grid-template-columns:1fr}.landing-nav{padding:0 16px}.overview-hero h1{font-size:28px}.arch-flow{flex-direction:column}.arch-arrow{padding:4px;transform:rotate(90deg)}}@media (max-width:900px){.panel-right,.panel-right~.resize-handle-h{display:none}.panel-left{width:40%!important}.panel-center{width:60%!important}}@media (max-width:600px){.panels{flex-direction:column}.resize-handle-h{display:none}.panel-left,.panel-center{border-right:none;border-bottom:1px solid var(--border-color);height:50%;width:100%!important}}.lb-tabs{gap:8px;margin-bottom:28px;display:flex}.lb-tab{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;align-items:center;gap:8px;padding:10px 20px;font-family:inherit;font-size:14px;font-weight:600;transition:all .2s;display:flex}.lb-tab svg{stroke:currentColor;fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round;width:16px;height:16px}.lb-tab:hover{background:var(--bg-hover);border-color:var(--accent-primary);color:var(--text-primary)}.lb-tab.active{background:var(--accent-gradient);color:#fff;border-color:#0000}.lb-tab.active svg{stroke:#fff}.lb-tab-badge{background:#fff3;border-radius:10px;padding:2px 8px;font-size:11px;font-weight:700}.lb-podium{justify-content:center;align-items:flex-end;gap:16px;margin-bottom:8px;display:flex}.lb-podium-card{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-lg);opacity:0;flex-direction:column;align-items:center;min-width:140px;padding:20px 24px;animation:.5s forwards fadeInUp;display:flex}.lb-podium-first{border-color:#ffd7004d;padding:28px 32px;box-shadow:0 0 40px #ffd70014}.lb-podium-rank{margin-bottom:8px;font-size:22px;font-weight:900}.lb-podium-avatar{color:#1a1a2e;border-radius:50%;justify-content:center;align-items:center;width:48px;height:48px;margin-bottom:8px;font-size:18px;font-weight:800;display:flex}.lb-podium-first .lb-podium-avatar{width:60px;height:60px;font-size:22px}.lb-podium-name{color:var(--text-primary);margin-bottom:4px;font-size:14px;font-weight:700}.lb-podium-stat{color:var(--accent-primary);font-size:13px;font-weight:700}.lb-podium-sub{color:var(--text-muted);font-size:12px}.lb-highlight td{background:rgba(var(--accent-primary),.05)!important}.lb-rank{align-items:center;gap:4px;font-size:13px;display:flex}.lb-table-avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;font-size:12px;font-weight:700;display:flex}.ach-summary{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-lg);align-items:center;gap:32px;margin-bottom:32px;padding:24px;display:flex}.ach-progress-ring{flex-shrink:0;width:120px;height:120px;position:relative}.ach-progress-ring svg{width:100%;height:100%}.ach-progress-text{text-align:center;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.ach-progress-num{color:var(--accent-primary);font-size:28px;font-weight:900;line-height:1}.ach-progress-den{color:var(--text-muted);font-size:13px;font-weight:600;display:block}.ach-summary-info h2{color:var(--text-primary);margin-bottom:4px;font-size:20px;font-weight:800}.ach-mini-stats{color:var(--text-secondary);gap:16px;margin-top:12px;font-size:13px;display:flex}.ach-mini-stats strong{color:var(--accent-primary)}.ach-grid{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px;display:grid}.ach-card{background:var(--bg-card);border:1px solid var(--glass-border);border-radius:var(--radius-md);opacity:0;align-items:center;gap:14px;padding:16px;transition:all .25s;animation:.4s forwards fadeInUp;display:flex}.ach-earned{border-color:var(--accent-primary);background:linear-gradient(135deg,var(--bg-card)0%,rgba(var(--accent-primary),.03)100%)}.ach-locked{opacity:.5}.ach-card:hover{box-shadow:var(--shadow-sm);transform:translateY(-2px)}.ach-icon{border-radius:var(--radius-sm);background:var(--bg-hover);flex-shrink:0;justify-content:center;align-items:center;width:42px;height:42px;display:flex}.ach-earned .ach-icon{background:var(--accent-gradient)}.ach-icon svg{width:20px;height:20px;stroke:var(--text-muted);fill:none;stroke-width:2px;stroke-linecap:round;stroke-linejoin:round}.ach-earned .ach-icon svg{stroke:#fff}.ach-info h4{color:var(--text-primary);margin-bottom:2px;font-size:14px;font-weight:700}.ach-info p{color:var(--text-muted);font-size:12px}.ach-check{background:var(--success);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;margin-left:auto;display:flex}.ach-check svg{stroke:#fff;fill:none;stroke-width:3px;stroke-linecap:round;stroke-linejoin:round;width:14px;height:14px}@keyframes skeleton-shimmer{0%{background-position:-400px 0}to{background-position:400px 0}}.skeleton{background:linear-gradient(90deg,var(--bg-input)25%,var(--bg-hover)37%,var(--bg-input)63%);background-size:800px 100%;border-radius:8px;animation:1.6s ease-in-out infinite skeleton-shimmer}.skeleton-text{border-radius:4px;height:14px;margin-bottom:10px}.skeleton-text.sm{width:60%}.skeleton-text.md{width:80%}.skeleton-text.lg{width:100%}.skeleton-text.xs{width:40%;height:12px}.skeleton-card{border-radius:12px;min-height:100px;padding:20px}.skeleton-avatar{border-radius:50%;flex-shrink:0;width:40px;height:40px}.skeleton-row{border-bottom:1px solid var(--border-subtle);align-items:center;gap:12px;padding:14px 16px;display:flex}.skeleton-stats-row{grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:24px;display:grid}.skeleton-table{border:1px solid var(--border-color);background:var(--bg-card);border-radius:12px;overflow:hidden}.skeleton-table-header{border-bottom:1px solid var(--border-color);background:var(--bg-secondary);gap:16px;padding:14px 20px;display:flex}.skeleton-podium{justify-content:center;gap:24px;margin-bottom:32px;display:flex}.skeleton-podium-card{border-radius:16px;flex-direction:column;align-items:center;gap:10px;width:160px;padding:24px 20px;display:flex}.page-skeleton{max-width:1200px;margin:0 auto;padding:24px 32px}@media (max-width:768px){.ide-layout .panels{flex-direction:column;overflow-y:auto}.ide-layout .panel-left,.ide-layout .panel-center,.ide-layout .panel-right{border-bottom:2px solid var(--border-color);flex:none;min-height:500px;width:100%!important}.resize-handle-h{display:none!important}.editor-toolbar{flex-wrap:wrap;gap:8px;height:auto;padding:8px 16px}.lang-select{flex:1;min-width:100px}.editor-area{min-height:300px}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}@property --tw-backdrop-blur{syntax:"*";inherits:false}@property --tw-backdrop-brightness{syntax:"*";inherits:false}@property --tw-backdrop-contrast{syntax:"*";inherits:false}@property --tw-backdrop-grayscale{syntax:"*";inherits:false}@property --tw-backdrop-hue-rotate{syntax:"*";inherits:false}@property --tw-backdrop-invert{syntax:"*";inherits:false}@property --tw-backdrop-opacity{syntax:"*";inherits:false}@property --tw-backdrop-saturate{syntax:"*";inherits:false}@property --tw-backdrop-sepia{syntax:"*";inherits:false}