:root{--bg-primary: #f8fafc;--bg-secondary: #ffffff;--bg-tertiary: #f1f5f9;--bg-card: #ffffff;--text-primary: #1e293b;--text-secondary: #64748b;--text-muted: #94a3b8;--accent-cyan: #06b6d4;--accent-blue: #3b82f6;--accent-purple: #8b5cf6;--accent-orange: #f97316;--accent-yellow: #eab308;--accent-green: #22c55e;--accent-red: #ef4444;--go-blue: #00add8;--go-teal: #0891b2;--go-yellow: #ca8a04;--go-green: #22c55e;--danger: #ef4444;--border-color: #e2e8f0;--border-light: #f1f5f9;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 16px;--shadow-sm: 0 1px 2px rgba(0,0,0,.05);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--shadow-lg: 0 8px 24px rgba(0,0,0,.12);--font-mono: "JetBrains Mono", monospace;--font-sans: "Commissioner", 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input::placeholder{color:var(--text-muted)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.875rem 1.5rem;font-size:1rem;font-weight:600;font-family:var(--font-sans);border:none;border-radius:var(--radius-sm);cursor:pointer;transition:all .2s}.btn-primary{background:linear-gradient(135deg,var(--go-blue),var(--go-teal));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 16px #00add866}.btn-secondary{background:var(--bg-tertiary);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:var(--border-color)}.btn-ghost{background:transparent;color:var(--go-blue)}.btn-ghost:hover{background:#00add81a}.auth-footer{text-align:center;margin-top:1.5rem;color:var(--text-secondary)}.auth-footer a{color:var(--go-blue);text-decoration:none;font-weight:500}.auth-footer a:hover{text-decoration:underline}.error-message{background:#f851491a;border:1px solid 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.5rem;background:#00add826;color:var(--go-blue);border-radius:4px;font-size:.7rem;font-weight:600;text-transform:uppercase}.sprint-item-title{font-size:1rem;font-weight:600;flex:1}.sprint-check{color:var(--accent-green);font-weight:700}.sprint-item-topics{display:flex;flex-wrap:wrap;gap:.5rem 1rem;margin-bottom:.75rem}.sprint-topic-inline{display:flex;align-items:center;gap:.375rem;font-size:.8rem;color:var(--text-secondary)}.sprint-topic-inline svg{color:var(--go-teal)}.sprint-item-footer{display:flex;align-items:center;justify-content:space-between}.sprint-mini-progress{display:flex;align-items:center;gap:.5rem;font-size:.75rem;color:var(--text-muted)}.progress-bar-mini{width:80px;height:4px;background:var(--bg-tertiary);border-radius:2px;overflow:hidden}.sprint-arrow{color:var(--go-blue);opacity:0;transition:opacity .2s}.sprint-item:hover .sprint-arrow{opacity:1}.lesson-icon{width:32px;height:32px;display:flex;align-items:center;justify-content:center;font-size:1.25rem;flex-shrink:0}.lesson-title{display:flex;align-items:center;gap:.5rem}.lesson-check-inline{color:var(--accent-green)}.sprint-header-card{position:relative;background:linear-gradient(135deg,var(--bg-card) 0%,rgba(0,173,216,.08) 100%);border:1px solid var(--go-blue);border-radius:var(--radius-lg);padding:2rem;margin-bottom:2rem;overflow:hidden}.sprint-header-number{position:absolute;top:1rem;right:1.5rem;font-family:var(--font-mono);font-size:5rem;font-weight:700;color:#00add826;line-height:1}.sprint-header-content{position:relative;z-index:1}.sprint-header-card h1{font-size:1.75rem;margin-bottom:.5rem}.sprint-header-card>.sprint-header-content>p{color:var(--text-secondary);margin-bottom:1.5rem}.sprint-header-topics{display:flex;flex-wrap:wrap;gap:1.5rem;margin-bottom:1.5rem}.sprint-header-topic{display:flex;align-items:center;gap:.5rem;color:var(--text-secondary);font-size:.9rem}.sprint-header-topic svg{color:var(--go-teal)}.sprint-header-progress{max-width:400px}.sprint-header-progress .progress-bar{height:8px;margin-bottom:.5rem}.leaderboard-podium{display:grid;grid-template-columns:1fr 1fr 1fr;gap:1rem;margin-bottom:2rem}.podium-item{display:flex;flex-direction:column;align-items:center;padding:1.5rem;background:var(--bg-card);border-radius:var(--radius-lg);text-align:center}.podium-item.gold{background:linear-gradient(135deg,#fff9e6,#fef3cd);border:2px solid #ffd700;order:1;transform:scale(1.05)}.podium-item.silver{background:linear-gradient(135deg,#f8f9fa,#e9ecef);border:2px solid 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