:root{--bg: #0f1220;--card: #151a2e;--text: #f8fafc;--muted: #94a3b8;--accent: #7c3aed;--accent2: #22d3ee;--border: rgba(148, 163, 184, .2);--green: #22c55e;--yellow: #eab308;--red: #ef4444;--orange: #f97316;--blue: #3b82f6;--purple: #a855f7;--gold: #fbbf24;--silver: #94a3b8;--bronze: #cd7f32}*{box-sizing:border-box;margin:0;padding:0}body{font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial;background:radial-gradient(circle at top left,#1f2440,#0b0d18 65%);color:var(--text);min-height:100vh;padding:40px 24px}.container{max-width:1000px;margin:0 auto}header{margin-bottom:32px}.back{color:var(--muted);text-decoration:none;font-size:.9rem;display:inline-block;margin-bottom:16px}.back:hover{color:var(--accent2)}h1{font-size:2rem;margin-bottom:8px}.subtitle{color:var(--muted);font-size:1rem}.card{background:#151a2eb3;border:1px solid var(--border);border-radius:12px;padding:24px;margin-bottom:20px}.card h3{font-size:1rem;color:var(--muted);margin-bottom:16px;text-transform:uppercase;letter-spacing:.5px}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px;margin-bottom:24px}.stat-card{background:#151a2eb3;border:1px solid var(--border);border-radius:12px;padding:20px;text-align:center}.stat-value{font-size:2rem;font-weight:700;color:var(--accent2)}.stat-value.active{color:var(--green)}.stat-value.pending{color:var(--yellow)}.stat-value.completed{color:var(--purple)}.stat-label{font-size:.8rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px;margin-top:4px}.tabs{display:flex;gap:8px;margin-bottom:24px;border-bottom:1px solid var(--border);padding-bottom:16px}.tab{background:transparent;border:1px solid var(--border);border-radius:8px;padding:10px 20px;color:var(--muted);cursor:pointer;font-size:.9rem;transition:all .2s}.tab:hover{border-color:var(--accent2);color:var(--text)}.tab.active{background:linear-gradient(135deg,var(--accent),var(--accent2));border-color:transparent;color:#fff}.challenge-list{display:flex;flex-direction:column;gap:16px}.challenge-card{background:#0003;border-radius:12px;padding:20px;border-left:4px solid var(--accent);transition:transform .2s,box-shadow .2s}.challenge-card:hover{transform:translate(4px);box-shadow:0 4px 20px #0000004d}.challenge-card.weekly{border-left-color:var(--accent2)}.challenge-card.monthly{border-left-color:var(--purple)}.challenge-card.archived{border-left-color:var(--muted);opacity:.7}.challenge-header{display:flex;justify-content:space-between;align-items:flex-start;margin-bottom:12px}.challenge-title{font-size:1.2rem;font-weight:600;margin-bottom:4px}.challenge-category{font-size:.75rem;color:var(--muted);text-transform:uppercase;letter-spacing:.5px}.challenge-badge{padding:4px 12px;border-radius:12px;font-size:.7rem;font-weight:600;text-transform:uppercase}.challenge-badge.weekly{background:#22d3ee33;color:var(--accent2)}.challenge-badge.monthly{background:#a855f733;color:var(--purple)}.challenge-badge.active{background:#22c55e33;color:var(--green)}.challenge-badge.ended{background:#94a3b833;color:var(--muted)}.challenge-description{color:var(--muted);font-size:.9rem;margin-bottom:16px;line-height:1.5}.challenge-meta{display:flex;gap:24px;align-items:center;flex-wrap:wrap}.challenge-stat{display:flex;align-items:center;gap:6px;font-size:.85rem;color:var(--muted)}.challenge-stat-value{color:var(--text);font-weight:600}.challenge-actions{display:flex;gap:12px;margin-top:16px}.btn{padding:10px 20px;border-radius:8px;font-size:.9rem;font-weight:500;cursor:pointer;transition:all .2s;border:none}.btn-primary{background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:0 4px 12px #7c3aed66}.btn-secondary{background:transparent;border:1px solid var(--border);color:var(--text)}.btn-secondary:hover{border-color:var(--accent2);color:var(--accent2)}.btn:disabled{opacity:.5;cursor:not-allowed}.leaderboard{display:flex;flex-direction:column;gap:12px}.leaderboard-entry{display:grid;grid-template-columns:50px 1fr auto auto;gap:16px;align-items:center;padding:16px;background:#0003;border-radius:12px}.leaderboard-entry.top-3{background:#0000004d;border:1px solid var(--border)}.leaderboard-rank{font-size:1.5rem;font-weight:700;text-align:center}.leaderboard-rank.gold{color:var(--gold)}.leaderboard-rank.silver{color:var(--silver)}.leaderboard-rank.bronze{color:var(--bronze)}.leaderboard-user{display:flex;flex-direction:column}.leaderboard-name{font-weight:600;font-size:1rem}.leaderboard-streak{font-size:.8rem;color:var(--orange);display:flex;align-items:center;gap:4px}.leaderboard-stats{display:flex;gap:24px;text-align:center}.leaderboard-stat{display:flex;flex-direction:column}.leaderboard-stat-value{font-size:1.2rem;font-weight:600;color:var(--accent2)}.leaderboard-stat-label{font-size:.7rem;color:var(--muted);text-transform:uppercase}.leaderboard-points{font-size:1.5rem;font-weight:700;color:var(--accent2);text-align:right;min-width:80px}.submission-form{background:#0003;border-radius:12px;padding:24px}.form-group{margin-bottom:20px}.form-label{display:block;font-size:.9rem;color:var(--muted);margin-bottom:8px}.form-input,.form-textarea,.form-select{width:100%;padding:12px 16px;background:#0000004d;border:1px solid var(--border);border-radius:8px;color:var(--text);font-size:.95rem;transition:border-color .2s}.form-input:focus,.form-textarea:focus,.form-select:focus{outline:none;border-color:var(--accent2)}.form-textarea{min-height:100px;resize:vertical}.form-select{appearance:none;cursor:pointer;background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2394a3b8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 12px center;background-size:16px}.verification-status{display:flex;align-items:center;gap:12px;padding:16px;border-radius:8px;margin-top:16px}.verification-status.pending{background:#eab3081a;border:1px solid rgba(234,179,8,.3)}.verification-status.verified{background:#22c55e1a;border:1px solid rgba(34,197,94,.3)}.verification-status.rejected{background:#ef44441a;border:1px solid rgba(239,68,68,.3)}.verification-icon{font-size:1.5rem}.verification-content{flex:1}.verification-title{font-weight:600;margin-bottom:4px}.verification-message{font-size:.85rem;color:var(--muted)}.progress-ring{position:relative;width:80px;height:80px}.progress-ring-circle{transform:rotate(-90deg);transform-origin:50% 50%}.progress-ring-bg{fill:none;stroke:var(--border);stroke-width:6}.progress-ring-progress{fill:none;stroke:var(--accent2);stroke-width:6;stroke-linecap:round;transition:stroke-dashoffset .3s ease}.progress-ring-text{position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);font-size:1rem;font-weight:700;color:var(--accent2)}.time-remaining{display:flex;gap:16px;justify-content:center;margin:20px 0}.time-unit{text-align:center;padding:12px 16px;background:#0003;border-radius:8px;min-width:70px}.time-value{font-size:1.5rem;font-weight:700;color:var(--accent2)}.time-label{font-size:.7rem;color:var(--muted);text-transform:uppercase}.submissions-list{display:flex;flex-direction:column;gap:12px}.submission-entry{display:grid;grid-template-columns:auto 1fr auto auto;gap:16px;align-items:center;padding:16px;background:#0003;border-radius:8px}.submission-type-icon{font-size:1.5rem}.submission-info h4{font-size:.95rem;margin-bottom:4px}.submission-meta{font-size:.8rem;color:var(--muted)}.submission-status{padding:4px 12px;border-radius:12px;font-size:.75rem;font-weight:600;text-transform:uppercase}.submission-status.pending{background:#eab30833;color:var(--yellow)}.submission-status.verified{background:#22c55e33;color:var(--green)}.submission-status.rejected{background:#ef444433;color:var(--red)}.submission-points{font-weight:600;color:var(--accent2)}.two-col{display:grid;grid-template-columns:1fr 1fr;gap:20px}.empty-state{text-align:center;padding:48px 24px;color:var(--muted)}.empty-icon{font-size:3rem;margin-bottom:16px}.empty-title{font-size:1.2rem;color:var(--text);margin-bottom:8px}@media(max-width:768px){.stats-grid{grid-template-columns:repeat(2,1fr)}.two-col{grid-template-columns:1fr}.leaderboard-entry{grid-template-columns:40px 1fr auto}.leaderboard-stats{display:none}.challenge-meta{flex-direction:column;align-items:flex-start;gap:8px}.time-remaining{flex-wrap:wrap}}