:root{--primary: #6366f1;--primary-hover: #4f46e5;--bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e1b4b 100%);--card-bg: rgba(30, 41, 59, .7);--border-color: rgba(255, 255, 255, .1);--text-main: #f8fafc;--text-muted: #94a3b8;--accent: #f59e0b}body{margin:0;font-family:PingFang SC,Microsoft YaHei,sans-serif;background:var(--bg-gradient);color:var(--text-main);min-height:100vh}.app-container{max-width:1200px;margin:0 auto;padding:20px;box-sizing:border-box;display:flex;flex-direction:column;min-height:100vh}.game-header{display:flex;justify-content:space-between;align-items:center;padding-bottom:20px;border-bottom:1px solid var(--border-color);margin-bottom:24px}.header-left{display:flex;align-items:center;gap:10px}.header-left h1{font-size:1.5rem;margin:0;background:linear-gradient(to right,#a5b4fc,#818cf8);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.subtitle{font-size:.9rem;font-weight:400;color:var(--text-muted);margin-left:8px}.icon-sparkle{color:var(--accent);animation:pulse 2s infinite}.header-right{display:flex;gap:12px;align-items:center}.btn-icon{background:#ffffff0d;border:1px solid var(--border-color);color:var(--text-main);padding:8px;border-radius:8px;cursor:pointer;transition:all .2s}.btn-icon:hover{background:#ffffff1a}.btn-home{background:#6366f133;border:1px solid var(--primary);color:#c7d2fe;padding:8px 16px;border-radius:8px;cursor:pointer;display:flex;align-items:center;gap:6px;font-size:.9rem;transition:all .2s}.btn-home:hover{background:var(--primary);color:#fff}.welcome-card{background:var(--card-bg);border:1px solid var(--border-color);border-radius:16px;padding:24px;margin-bottom:32px;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.welcome-card h2{margin-top:0;color:#a5b4fc}.welcome-card p{color:var(--text-muted);line-height:1.6;margin-bottom:0}.level-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px}.level-card{background:#1e293b66;border:1px solid var(--border-color);border-radius:16px;padding:20px;cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;flex-direction:column;justify-content:space-between;min-height:160px;position:relative;overflow:hidden}.level-card.unlocked:hover{transform:translateY(-5px);border-color:var(--primary);box-shadow:0 10px 20px #6366f126;background:#1e293bcc}.level-card.locked{opacity:.5;cursor:not-allowed;background:#0f172a99}.level-card-header{display:flex;justify-content:space-between;align-items:center}.difficulty-badge{font-size:.75rem;padding:4px 8px;border-radius:9999px;font-weight:700}.diff-入门{background:#22c55e33;color:#4ade80}.diff-简单{background:#3b82f633;color:#60a5fa}.diff-中等{background:#f59e0b33;color:#fbbf24}.diff-困难{background:#ef444433;color:#f87171}.diff-大师{background:#a855f733;color:#c084fc}.completed-icon{color:#22c55e}.level-card-body{margin:16px 0}.level-card-body h3{margin:0;font-size:.85rem;color:var(--text-muted);text-transform:uppercase}.level-card-body h4{margin:4px 0 0;font-size:1.2rem;color:var(--text-main)}.level-card-footer{border-top:1px solid rgba(255,255,255,.05);padding-top:12px;display:flex;justify-content:space-between;align-items:center}.level-stats{display:flex;width:100%;justify-content:space-between;align-items:center}.stars{display:flex;gap:2px}.star-active{color:var(--accent);fill:var(--accent)}.star-inactive{color:#ffffff1a}.best-time{font-size:.75rem;color:var(--text-muted)}.locked-text{font-size:.8rem;color:var(--text-muted)}.game-info-bar{display:flex;justify-content:space-between;align-items:center;background:#1e293b80;border:1px solid var(--border-color);padding:12px 20px;border-radius:12px;margin-bottom:20px}.level-title-display{display:flex;align-items:center;gap:10px}.level-num{background:var(--primary);color:#fff;padding:4px 8px;border-radius:6px;font-size:.85rem;font-weight:700}.level-name-text{font-size:1.1rem;font-weight:700}.timer-display{display:flex;align-items:center;gap:8px;font-family:monospace;font-size:1.2rem;color:#38bdf8;background:#38bdf81a;padding:4px 12px;border-radius:8px}.game-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:32px;align-items:start}@media (max-width: 900px){.game-layout{grid-template-columns:1fr}}.board-wrapper{background:#0f172acc;padding:12px;border-radius:16px;border:2px solid rgba(255,255,255,.15);box-shadow:0 20px 25px -5px #00000080;width:100%;max-width:480px;margin:0 auto;box-sizing:border-box}.sudoku-board{display:grid;grid-template-columns:repeat(9,1fr);grid-template-rows:repeat(9,1fr);gap:1px;background-color:#ffffff1a;border:3px solid rgba(255,255,255,.4);border-radius:8px;overflow:hidden;aspect-ratio:1 / 1}.sudoku-cell{background-color:#1e293b;display:flex;align-items:center;justify-content:center;font-size:clamp(1rem,4.5vw,1.6rem);font-weight:700;cursor:pointer;-webkit-user-select:none;user-select:none;transition:all .15s ease;aspect-ratio:1 / 1}.border-r-bold{border-right:3px solid rgba(255,255,255,.4)}.border-b-bold{border-bottom:3px solid rgba(255,255,255,.4)}.cell-original{color:#cbd5e1;background-color:#1e293bcc}.cell-user{color:#818cf8}.cell-related{background-color:#6366f11a}.cell-selected{background-color:#6366f159!important;box-shadow:inset 0 0 0 2px var(--primary)}.cell-conflict{background-color:#ef444433!important;color:#f87171!important}.control-panel{display:flex;flex-direction:column;gap:20px}.action-button-group{display:grid;grid-template-columns:repeat(3,1fr);gap:10px}.btn-action{display:flex;flex-direction:column;align-items:center;gap:6px;padding:12px 8px;border-radius:12px;font-size:.85rem;font-weight:700;cursor:pointer;border:1px solid transparent;transition:all .2s}.btn-undo{background:#94a3b81a;color:#cbd5e1;border-color:#94a3b833}.btn-undo:hover:not(:disabled){background:#94a3b833}.btn-undo:disabled{opacity:.4;cursor:not-allowed}.btn-reset{background:#ef44441a;color:#f87171;border-color:#ef444433}.btn-reset:hover{background:#ef444433}.btn-hint{background:#f59e0b26;color:#fbbf24;border-color:#f59e0b4d}.btn-hint:hover:not(:disabled){background:#f59e0b40}.keyboard-container{background:#1e293b66;border:1px solid var(--border-color);padding:16px;border-radius:16px}.keyboard-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px}.btn-key{aspect-ratio:1 / 1;background:#1e293b;border:1px solid var(--border-color);color:var(--text-main);font-size:1.4rem;font-weight:700;border-radius:8px;cursor:pointer;transition:all .15s;display:flex;align-items:center;justify-content:center}.btn-key:hover{background:var(--primary);border-color:var(--primary);transform:scale(1.05)}.btn-clear-key{grid-column:span 2;aspect-ratio:auto;font-size:1rem;color:#f87171}.btn-clear-key:hover{background:#ef444433;border-color:#ef4444}.game-tips{font-size:.85rem;color:var(--text-muted);line-height:1.5;background:#ffffff05;padding:12px;border-radius:8px;border-left:3px solid var(--primary)}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#0f172ad9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;align-items:center;justify-content:center;z-index:100;padding:20px}.success-modal{background:#1e1b4b;border:2px solid var(--primary);border-radius:24px;padding:32px;max-width:440px;width:100%;text-align:center;box-shadow:0 25px 50px -12px #6366f180}.trophy-wrapper{margin-bottom:16px}.trophy-icon{color:var(--accent);filter:drop-shadow(0 0 12px rgba(245,158,11,.5))}.success-modal h2{font-size:2rem;margin:12px 0;background:linear-gradient(to right,#fbbf24,#f59e0b);-webkit-background-clip:text;-webkit-text-fill-color:transparent}.congrats-text{color:#c7d2fe;margin-bottom:24px}.stats-summary{display:grid;grid-template-columns:1fr 1fr;gap:16px;background:#ffffff0d;padding:16px;border-radius:16px;margin-bottom:24px}.stat-item{display:flex;flex-direction:column;gap:4px}.stat-label{font-size:.8rem;color:var(--text-muted)}.stat-value{font-size:1.2rem;font-weight:700;color:#38bdf8}.star-rating{display:flex;justify-content:center;gap:12px;margin-bottom:32px}.modal-actions{display:flex;gap:12px}.btn-modal-primary{flex:1;background:var(--primary);color:#fff;border:none;padding:12px 20px;border-radius:12px;font-weight:700;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:all .2s}.btn-modal-primary:hover{background:var(--primary-hover)}.btn-modal-secondary{flex:1;background:#ffffff0d;border:1px solid var(--border-color);color:var(--text-main);padding:12px 20px;border-radius:12px;font-weight:700;cursor:pointer;transition:all .2s}.btn-modal-secondary:hover{background:#ffffff1a}.animate-fade-in{animation:fadeIn .3s ease-out}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes pulse{0%,to{transform:scale(1);opacity:1}50%{transform:scale(1.1);opacity:.8}}