:root{--primary: #2d3a8c;--primary-light: #4f5cb3;--primary-surface: #eef0f8;--primary-hover: #252f73;--accent: #00c4a3;--accent-light: #b2f0e4;--accent-surface: #e8faf6;--bg: #f8f9fb;--bg-card: #ffffff;--bg-elevated: #ffffff;--text: #1a1e2e;--text-secondary: #5e6478;--text-tertiary: #9098ad;--text-on-primary: #ffffff;--border: #e3e6ed;--border-light: #eff1f5;--success: #22a861;--success-surface: #edf9f2;--danger: #ef4444;--danger-surface: #fef2f2;--warning: #f59e0b;--radius: 12px;--radius-sm: 8px;--radius-lg: 16px;--radius-full: 9999px;--shadow-sm: 0 2px 8px rgba(26,30,46,.06);--shadow-md: 0 4px 16px rgba(26,30,46,.08);--shadow-lg: 0 12px 40px rgba(26,30,46,.12)}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Pretendard,-apple-system,BlinkMacSystemFont,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent}a{color:inherit;text-decoration:none}button{cursor:pointer;font-family:inherit}input{font-family:inherit}img{max-width:100%;height:auto}.page-center{display:flex;align-items:center;justify-content:center;min-height:100dvh;padding:24px}.loading{color:var(--text-secondary);font-size:16px}.btn-primary{background:var(--primary);color:var(--text-on-primary);border:none;border-radius:var(--radius-sm);padding:12px 24px;font-size:16px;font-weight:600;transition:background .15s}.btn-primary:hover{background:var(--primary-hover)}.btn-primary:disabled{opacity:.5;cursor:not-allowed}.btn-primary.btn-lg{padding:16px 32px;font-size:18px;border-radius:var(--radius)}.btn-secondary{background:var(--bg);color:var(--primary);border:1.5px solid var(--border);border-radius:var(--radius-sm);padding:12px 24px;font-size:16px;font-weight:600;transition:border-color .15s,background .15s}.btn-secondary:hover{background:var(--primary-surface);border-color:var(--primary-light)}.btn-ghost{background:none;color:var(--text-secondary);border:none;padding:8px 12px;font-size:15px;font-weight:500;transition:color .15s}.btn-ghost:hover{color:var(--text)}.btn-sm{padding:8px 16px;font-size:14px}.btn-success{background:var(--success);color:#fff;border:none;border-radius:var(--radius-sm);padding:14px 24px;font-size:16px;font-weight:600}.btn-fail{background:var(--danger);color:#fff;border:none;border-radius:var(--radius-sm);padding:14px 24px;font-size:16px;font-weight:600}.login-page{display:flex;align-items:center;justify-content:center;min-height:100dvh;padding:24px;background:linear-gradient(135deg,var(--primary) 0%,var(--primary-light) 100%)}.login-card{background:var(--bg-card);border-radius:var(--radius-lg);padding:40px 32px;width:100%;max-width:380px;box-shadow:var(--shadow-lg);text-align:center}.login-title{font-size:28px;font-weight:800;color:var(--primary);margin-bottom:4px}.login-subtitle{font-size:15px;color:var(--text-secondary);margin-bottom:32px}.login-form{display:flex;flex-direction:column;gap:12px}.login-input{width:100%;padding:14px 16px;font-size:16px;border:1.5px solid var(--border);border-radius:var(--radius-sm);background:var(--bg);color:var(--text);outline:none;transition:border-color .15s}.login-input:focus{border-color:var(--primary)}.login-input--pin{text-align:center;font-size:24px;letter-spacing:12px;font-weight:700}.login-error{background:var(--danger-surface);color:var(--danger);padding:10px 14px;border-radius:var(--radius-sm);font-size:14px;text-align:left}.login-btn{width:100%;padding:16px;font-size:17px;font-weight:700;background:var(--primary);color:var(--text-on-primary);border:none;border-radius:var(--radius-sm);margin-top:8px;transition:background .15s}.login-btn:hover{background:var(--primary-hover)}.login-btn:disabled{opacity:.5;cursor:not-allowed}.login-academy-select{cursor:pointer;text-align:left;color:var(--text-secondary)}.login-academy-select:not(:empty){color:var(--text)}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:100;background:#00000073;display:flex;align-items:center;justify-content:center;padding:24px}.modal-content{background:var(--bg-card);border-radius:var(--radius-lg);width:100%;max-width:360px;max-height:70vh;box-shadow:var(--shadow-lg);overflow:hidden;display:flex;flex-direction:column}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;border-bottom:1px solid var(--border)}.modal-header h2{font-size:18px;font-weight:700;margin:0}.modal-close{background:none;border:none;font-size:24px;color:var(--text-secondary);cursor:pointer;line-height:1}.academy-list{list-style:none;margin:0;padding:8px 0;overflow-y:auto}.academy-item{display:flex;align-items:center;gap:12px;padding:14px 20px;cursor:pointer;transition:background .12s}.academy-item:hover{background:var(--bg-hover, #f5f5f5)}.academy-item.selected{background:var(--primary-surface, #e8f0fe)}.academy-icon{font-size:22px}.academy-name{font-size:16px;font-weight:500}.academy-empty{color:var(--text-secondary);justify-content:center;cursor:default;font-size:14px}.play-header{display:flex;align-items:center;justify-content:space-between;padding:12px 16px;background:var(--bg-card);border-bottom:1px solid var(--border-light);position:sticky;top:0;z-index:10}.play-counter{font-size:15px;font-weight:600;color:var(--text-secondary)}.home-page{max-width:480px;margin:0 auto;padding:0 16px 32px}.home-header{display:flex;align-items:center;justify-content:space-between;padding:20px 0 16px}.home-header h1{font-size:22px;font-weight:700}.home-grade{font-size:14px;color:var(--text-secondary);margin-top:2px}.home-progress-card{background:var(--bg-card);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow-sm);margin-bottom:20px}.home-progress-header{display:flex;justify-content:space-between;align-items:center;font-size:15px;font-weight:600;margin-bottom:12px}.home-progress-header span:last-child{color:var(--primary)}.home-progress-bar{height:10px;background:var(--border-light);border-radius:var(--radius-full);overflow:hidden}.home-progress-fill{height:100%;background:linear-gradient(90deg,var(--primary),var(--accent));border-radius:var(--radius-full);transition:width .4s ease}.home-progress-pct{display:block;text-align:right;font-size:13px;color:var(--text-tertiary);margin-top:6px}.home-modes{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-bottom:24px}.home-mode-card{display:flex;flex-direction:column;align-items:center;gap:8px;background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius);padding:20px 12px;font-size:15px;font-weight:600;color:var(--text);transition:border-color .15s,box-shadow .15s}.home-mode-card:hover,.home-mode-card:active{border-color:var(--primary-light);box-shadow:var(--shadow-sm)}.home-mode-icon{font-size:32px}.home-mode-label{font-weight:700}.home-mode-count{font-size:13px;color:var(--text-tertiary);font-weight:500}.home-section{margin-top:8px}.home-section h2{font-size:17px;font-weight:700;margin-bottom:12px}.home-proof-list{display:flex;flex-direction:column;gap:10px}.home-proof-item{background:var(--bg-card);border-radius:var(--radius);padding:16px;box-shadow:var(--shadow-sm);display:flex;align-items:center;justify-content:space-between;gap:12px}.home-proof-info{display:flex;flex-direction:column;gap:3px;min-width:0;flex:1}.home-proof-title{font-weight:600;font-size:15px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.home-proof-meta{font-size:13px;color:var(--text-tertiary)}.home-proof-score{font-size:13px;font-weight:600}.home-proof-score.good{color:var(--success)}.home-proof-score.low{color:var(--danger)}.home-proof-actions{display:flex;gap:6px;flex-shrink:0}.gacha-play-page{max-width:480px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column}.play-center{flex:1;display:flex;align-items:center;justify-content:center}.play-card{flex:1;display:flex;flex-direction:column;padding:24px 16px;gap:20px}.play-card-badge{align-self:flex-start;background:var(--primary-surface);color:var(--primary);padding:4px 12px;border-radius:var(--radius-full);font-size:13px;font-weight:600}.play-card-question{flex:1;display:flex;align-items:center;justify-content:center;min-height:200px}.play-card-img{max-height:300px;border-radius:var(--radius-sm)}.play-card-text{font-size:20px;line-height:1.6;text-align:center;word-break:break-word}.play-answer-area{display:flex;flex-direction:column;gap:12px}.play-answer-input{width:100%;padding:14px 16px;font-size:18px;border:2px solid var(--border);border-radius:var(--radius);background:var(--bg-card);color:var(--text);outline:none;text-align:center;transition:border-color .15s}.play-answer-input:focus{border-color:var(--primary)}.play-answer-buttons{display:flex;gap:10px}.play-answer-buttons .btn-primary{flex:1}.play-answer-buttons .btn-ghost{padding:12px 16px;font-size:15px;border:1.5px solid var(--border);border-radius:var(--radius-sm)}.play-reveal{background:var(--accent-surface);border-radius:var(--radius);padding:20px;text-align:center}.play-reveal--small{padding:14px}.play-reveal-label{font-size:13px;font-weight:600;color:var(--accent);text-transform:uppercase;letter-spacing:1px;margin-bottom:8px}.play-reveal-answer{font-size:20px;font-weight:600}.play-self-check{text-align:center}.play-self-check p{font-size:15px;color:var(--text-secondary);margin-bottom:12px}.play-self-buttons{display:flex;gap:10px}.play-self-buttons button{flex:1}.play-feedback{display:flex;align-items:center;justify-content:center;gap:12px;padding:24px;border-radius:var(--radius);font-size:24px;font-weight:800}.play-feedback--correct{background:var(--success-surface);color:var(--success)}.play-feedback--wrong{background:var(--danger-surface);color:var(--danger)}.play-feedback-icon{font-size:36px}.play-card-question-small{text-align:center;font-size:15px;color:var(--text-secondary)}.play-box-change{text-align:center;font-size:15px;font-weight:600;color:var(--text-secondary);padding:8px}.play-next-btn{align-self:stretch}.play-done{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:32px;gap:12px;text-align:center}.play-done-icon{font-size:56px}.play-done h2{font-size:22px;font-weight:700}.play-done p{font-size:15px;color:var(--text-secondary)}.play-error{color:var(--danger)}.proof-play-page{max-width:560px;margin:0 auto;min-height:100dvh;display:flex;flex-direction:column}.proof-play-title{padding:20px 16px 0}.proof-play-title h2{font-size:19px;font-weight:700}.proof-play-meta{display:block;font-size:13px;color:var(--text-tertiary);margin-top:4px}.proof-play-desc{padding:8px 16px 0;font-size:15px;color:var(--text-secondary);line-height:1.6}.proof-play-desc-img{margin:12px 16px 0;border-radius:var(--radius-sm);max-height:240px}.proof-play-instruction{padding:16px 16px 8px;font-size:14px;color:var(--text-tertiary);text-align:center;font-weight:500}.proof-play-actions{padding:20px 16px 32px;display:flex;gap:10px;justify-content:center}.proof-play-actions .btn-primary{flex:1;max-width:320px}.proof-play-actions .btn-secondary{flex:1;max-width:160px}.ordering-list{padding:12px 16px;display:flex;flex-direction:column;gap:8px}.ordering-step{display:flex;align-items:center;gap:10px;background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius);padding:14px 12px;box-shadow:var(--shadow-sm);touch-action:none;-webkit-user-select:none;user-select:none;cursor:grab;transition:border-color .15s,box-shadow .15s}.ordering-step:active{cursor:grabbing;border-color:var(--primary-light);box-shadow:var(--shadow-md)}.ordering-step-handle{color:var(--text-tertiary);font-size:18px;flex-shrink:0}.ordering-step-num{background:var(--primary-surface);color:var(--primary);width:28px;height:28px;border-radius:var(--radius-full);display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;flex-shrink:0}.ordering-step-content{flex:1;font-size:15px;line-height:1.5;min-width:0;overflow-wrap:break-word}.ordering-step-img{max-height:120px;border-radius:var(--radius-sm)}.fillblank-steps{padding:12px 16px;display:flex;flex-direction:column;gap:10px}.fillblank-step{background:var(--bg-card);border:1.5px solid var(--border);border-radius:var(--radius);padding:14px 16px;box-shadow:var(--shadow-sm)}.fillblank-step--active{border-color:var(--primary-light)}.fillblank-step-num{display:inline-block;font-size:12px;font-weight:700;color:var(--primary);background:var(--primary-surface);padding:2px 10px;border-radius:var(--radius-full);margin-bottom:8px}.fillblank-step-body{font-size:15px;line-height:1.7}.fillblank-step-img{max-height:160px;border-radius:var(--radius-sm);margin-bottom:8px}.fillblank-step-content{display:inline;line-height:2.2}.fillblank-input{display:inline-block;width:100px;padding:4px 8px;font-size:16px;font-weight:600;border:none;border-bottom:2.5px solid var(--primary);background:var(--primary-surface);color:var(--primary);text-align:center;outline:none;border-radius:4px 4px 0 0;margin:0 4px;vertical-align:baseline;transition:border-color .15s,background .15s}.fillblank-input:focus{background:#dde0f3;border-color:var(--primary-hover)}.fillblank-input::placeholder{color:var(--text-tertiary);font-weight:400}.proof-result{padding:24px 16px;display:flex;flex-direction:column;align-items:center;gap:20px}.proof-result-score{font-size:48px;font-weight:800}.proof-result-score.good{color:var(--success)}.proof-result-score.low{color:var(--danger)}.proof-result-detail{text-align:center;font-size:15px;color:var(--text-secondary);display:flex;flex-direction:column;gap:4px}.proof-result-steps{width:100%;display:flex;flex-direction:column;gap:6px}.proof-result-step{display:flex;align-items:center;justify-content:space-between;padding:10px 14px;border-radius:var(--radius-sm);font-size:14px;font-weight:500}.proof-result-step.correct{background:var(--success-surface);color:var(--success)}.proof-result-step.wrong{background:var(--danger-surface);color:var(--danger)}.proof-result-submitted{max-width:60%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.katex{font-size:1em}.katex-display{margin:8px 0}@media (max-width: 400px){.login-card{padding:32px 20px}.home-modes{gap:8px}.home-mode-card{padding:16px 8px}.home-proof-item{flex-direction:column;align-items:stretch}.home-proof-actions{justify-content:flex-end}.ordering-step{padding:12px 10px}.fillblank-input{width:80px}}