:root {
            --bg: #fdf8f3; --card: #fffefb; --primary: #8b4513; --primary-light: #a0522d; --accent: #c0392b; --accent-light: #e74c3c; --gold: #b8860b; --gold-light: #d4a745; --text: #3e2723; --text-light: #5d4037; --text-muted: #7b5b4e; --border: #e0d5c7; --shadow: 0 4px 20px rgba(139, 69, 19, 0.10); --shadow-lg: 0 12px 40px rgba(139, 69, 19, 0.15); --radius: 16px; --radius-sm: 10px; --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1); --font-heading: 'STSong', 'Songti SC', 'Noto Serif SC', 'KaiTi', 'STKaiti', '楷体', 'SimSun', '宋体', serif; --font-body: 'PingFang SC', 'Microsoft YaHei', 'Hiragino Sans GB', 'Noto Sans SC', sans-serif;
        }
        * { margin: 0; padding: 0; box-sizing: border-box; }
        body { font-family: var(--font-body); background: var(--bg); background-image: radial-gradient(ellipse at 20% 20%, rgba(184, 134, 11, 0.04) 0%, transparent 60%), radial-gradient(ellipse at 80% 60%, rgba(139, 69, 19, 0.04) 0%, transparent 60%), radial-gradient(ellipse at 50% 80%, rgba(160, 82, 45, 0.03) 0%, transparent 50%); color: var(--text); min-height: 100vh; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 20px; position: relative; line-height: 1.6; }
        body::before { content: ''; position: fixed; top: -120px; right: -120px; width: 400px; height: 400px; border-radius: 50%; border: 1px solid rgba(184,134,11,0.08); pointer-events: none; z-index: 0; }
        body::after { content: ''; position: fixed; bottom: -80px; left: -100px; width: 300px; height: 300px; border-radius: 50%; border: 1px solid rgba(139,69,19,0.06); pointer-events: none; z-index: 0; }
        .app-container { width: 100%; max-width: 720px; position: relative; z-index: 1; display: flex; flex-direction: column; gap: 0; }
        .page { display: none; flex-direction: column; gap: 20px; animation: fadeSlideIn 0.45s ease; }
        .page.active { display: flex; }
        @keyframes fadeSlideIn { from { opacity: 0; transform: translateY(18px); } to { opacity: 1; transform: translateY(0); } }
        @keyframes popIn { 0% { opacity: 0; transform: scale(0.88); } 60% { transform: scale(1.03); } 100% { opacity: 1; transform: scale(1); } }
        @keyframes pulse { 0%, 100% { box-shadow: 0 0 0 0 rgba(192, 57, 43, 0.35); } 50% { box-shadow: 0 0 0 18px rgba(192, 57, 43, 0); } }
        .card { background: var(--card); border-radius: var(--radius); box-shadow: var(--shadow); padding: 28px 30px; border: 1px solid var(--border); transition: var(--transition); position: relative; }
        .card:hover { box-shadow: var(--shadow-lg); }
        .card--accent { border-left: 5px solid var(--accent); }
        .card--gold { border-left: 5px solid var(--gold); }
        .card--highlight { background: linear-gradient(135deg, #fffefb 0%, #fef9f2 100%); border: 2px solid var(--gold-light); box-shadow: 0 6px 28px rgba(184, 134, 11, 0.18); }
        .hero-title { font-family: var(--font-heading); font-size: 2.6em; font-weight: 700; color: var(--primary); text-align: center; letter-spacing: 0.04em; margin-bottom: 4px; line-height: 1.3; }
        .hero-title .icon { display: inline-block; font-size: 1.1em; animation: popIn 0.6s ease; }
        .hero-subtitle { text-align: center; color: var(--text-muted); font-size: 1.05em; margin-bottom: 8px; font-family: var(--font-heading); letter-spacing: 0.03em; }
        .hero-desc { text-align: center; color: var(--text-light); font-size: 0.95em; background: rgba(184,134,11,0.05); border-radius: 20px; padding: 14px 20px; line-height: 1.7; }
        .btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 28px; border-radius: 28px; border: none; cursor: pointer; font-size: 1.05em; font-weight: 600; letter-spacing: 0.03em; transition: var(--transition); font-family: var(--font-body); white-space: nowrap; position: relative; text-decoration: none; user-select: none; }
        .btn:active { transform: scale(0.96); }
        .btn--primary { background: var(--accent); color: #fff; font-size: 1.4em; padding: 18px 48px; border-radius: 36px; letter-spacing: 0.05em; box-shadow: 0 6px 22px rgba(192,57,43,0.35); animation: pulse 2.5s infinite; }
        .btn--primary:hover { background: #a93226; box-shadow: 0 10px 30px rgba(192,57,43,0.45); transform: translateY(-2px); animation: none; }
        .btn--primary:active { animation: none; }
        .btn--outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); padding: 12px 20px; font-size: 1em; border-radius: 24px; }
        .btn--outline:hover { background: rgba(139,69,19,0.06); border-color: var(--primary-light); }
        .btn--ghost { background: rgba(139,69,19,0.04); color: var(--text-light); padding: 12px 20px; font-size: 1em; border-radius: 24px; border: 1px solid transparent; }
        .btn--ghost:hover { background: rgba(139,69,19,0.1); border-color: var(--border); }
        .btn--equal { flex: 1 1 0; min-width: 0; padding: 12px 16px; font-size: 1em; border-radius: 24px; justify-content: center; }
        .home-buttons { display: flex; flex-direction: column; gap: 16px; align-items: center; }
        .home-secondary { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; width: 100%; }
        .btn--difficulty { flex: 1; min-width: 100px; padding: 16px 18px; border-radius: var(--radius-sm); font-weight: 700; font-size: 1em; border: 2px solid transparent; transition: var(--transition); font-family: var(--font-heading); }
        .btn--difficulty.btn--basic { background: #f0faf0; color: #2d6a4f; border-color: #b7d7c5; }
        .btn--difficulty.btn--basic:hover { background: #d8f0e0; border-color: #6aaf8a; }
        .btn--difficulty.btn--intermediate { background: #fef9ee; color: #8b6914; border-color: #e0d0a0; }
        .btn--difficulty.btn--intermediate:hover { background: #fdf3d6; border-color: #c9a84c; }
        .btn--difficulty.btn--advanced { background: #fdf4f4; color: #8b1a1a; border-color: #dbb5b5; }
        .btn--difficulty.btn--advanced:hover { background: #fce8e8; border-color: #c45a5a; }
        .btn--difficulty.selected { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,0.2) !important; border-width: 3px !important; }
        .btn--basic.selected { border-color: #2d6a4f !important; background: #c8e8d4 !important; }
        .btn--intermediate.selected { border-color: #8b6914 !important; background: #fcecb8 !important; }
        .btn--advanced.selected { border-color: #8b1a1a !important; background: #fad4d4 !important; }
        .four-diagnosis { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
        @media (max-width: 500px) { .four-diagnosis { grid-template-columns: repeat(2, 1fr); } .hero-title { font-size: 1.8em; } .btn--primary { font-size: 1.2em; padding: 14px 28px; } .card { padding: 18px 16px; } .home-secondary { flex-direction: column; } .btn--equal { width: 100%; } }
        .btn--diag { padding: 16px 12px; border-radius: var(--radius-sm); font-weight: 700; font-size: 1.05em; border: 2px solid var(--border); background: var(--card); color: var(--primary); cursor: pointer; transition: var(--transition); font-family: var(--font-heading); display: flex; flex-direction: column; align-items: center; gap: 6px; }
        .btn--diag:hover { border-color: var(--primary-light); box-shadow: 0 6px 20px rgba(139,69,19,0.18); transform: translateY(-2px); background: #fffdf9; }
        .btn--diag:active { transform: scale(0.94); }
        .btn--diag.explored { background: #f9f5ef; border-color: #c9b896; color: #6b4d34; cursor: default; opacity: 0.75; }
        .btn--diag.explored::after { content: '✓'; font-size: 0.75em; color: #6b9e6b; position: absolute; top: 6px; right: 10px; }
        .btn--diag .diag-icon { font-size: 1.6em; line-height: 1; }
        .btn--diag .diag-label { font-size: 0.85em; }
        .clue-area { background: #fdfaf5; border-radius: var(--radius-sm); padding: 16px 18px; border: 1px dashed var(--border); min-height: 60px; max-height: 280px; overflow-y: auto; }
        .clue-area:empty::before { content: '🔍 线索收集区：点击上方四诊按钮探查线索...'; color: #c5b5a0; font-style: italic; font-size: 0.9em; display: block; text-align: center; padding: 20px 0; }
        .clue-item { display: flex; gap: 10px; padding: 10px 14px; margin: 6px 0; background: #fffefb; border-radius: 8px; border-left: 3px solid var(--gold); animation: popIn 0.35s ease; font-size: 0.93em; }
        .clue-item .clue-tag { font-weight: 700; font-size: 0.8em; padding: 3px 10px; border-radius: 12px; color: #fff; }
        .tag-wang { background: #5b8c5a; } .tag-wen { background: #b8860b; } .tag-ask { background: #7b5ea7; } .tag-pulse { background: #c0392b; }
        .answer-area { display: flex; flex-wrap: wrap; gap: 10px; align-items: center; }
        .answer-area input { flex: 1; min-width: 140px; padding: 12px 16px; border-radius: 24px; border: 2px solid var(--border); font-size: 0.95em; background: #fffefb; outline: none; }
        .answer-area input:focus { border-color: var(--primary-light); box-shadow: 0 0 0 4px rgba(139,69,19,0.07); }
        .modal-overlay { position: fixed; inset: 0; background: rgba(30,15,5,0.55); z-index: 1000; display: flex; align-items: center; justify-content: center; animation: fadeIn 0.25s; padding: 20px; }
        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }
        .modal { background: var(--card); border-radius: var(--radius); padding: 28px 26px; max-width: 560px; width: 100%; max-height: 85vh; overflow-y: auto; box-shadow: var(--shadow-lg); animation: popIn 0.4s; position: relative; border: 1px solid var(--border); }
        .modal-close { position: absolute; top: 12px; right: 16px; width: 36px; height: 36px; border-radius: 50%; border: none; background: rgba(0,0,0,0.05); cursor: pointer; font-size: 1.2em; display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
        .modal-close:hover { background: rgba(0,0,0,0.12); color: var(--text); }
        .modal h3 { font-family: var(--font-heading); color: var(--primary); margin-bottom: 14px; }
        .tongue-sim { display: flex; gap: 20px; flex-wrap: wrap; justify-content: center; margin: 10px 0; align-items: center; }
        .tongue-visual { width: 80px; height: 110px; border-radius: 40px 40px 30px 30px; background: linear-gradient(180deg, #f0c8c0 30%, #e8b4b0 60%, #e0a8a0 100%); border: 3px solid #d4a098; box-shadow: inset 0 0 20px rgba(180,130,120,0.3); position: relative; }
        .tongue-visual::after { content: ''; position: absolute; top: 25%; left: 15%; width: 70%; height: 45%; background: rgba(220,195,150,0.55); border-radius: 35px 35px 20px 20px; background-image: repeating-linear-gradient(0deg, transparent, transparent 3px, rgba(200,170,120,0.3) 3px, rgba(200,170,120,0.3) 5px); }
        .tongue-img { width: 130px; height: 175px; border-radius: 40px 40px 30px 30px; border: 3px solid #d4a098; box-shadow: inset 0 0 20px rgba(180,130,120,0.3); object-fit: cover; background: #fdfaf5; }
        .tongue-img-lg { width: 260px; height: 347px; border-radius: 80px 80px 55px 55px; border: 4px solid #d4a098; box-shadow: inset 0 0 24px rgba(180,130,120,0.3), 0 8px 24px rgba(139,69,19,0.14); object-fit: cover; background: #fdfaf5; }
        .inspect-nav { width: 44px; height: 44px; border-radius: 50%; border: 2px solid var(--border); background: var(--card); cursor: pointer; font-size: 1.6em; color: var(--primary); display: flex; align-items: center; justify-content: center; transition: var(--transition); flex: none; }
        .inspect-nav:hover { background: rgba(139,69,19,0.06); border-color: var(--primary-light); }
        .tongue-desc { max-width: 220px; font-size: 0.92em; color: var(--text-light); line-height: 1.7; }
        .result-box { padding: 20px; border-radius: var(--radius-sm); margin: 12px 0; animation: popIn 0.4s; line-height: 1.7; }
        .result-box.success { background: #f0faf4; border: 2px solid #6aaf8a; color: #1e4d34; }
        .result-box.fail { background: #fef9f4; border: 2px solid #e0b060; color: #6b4d20; }
        .chat-area { flex: 1; overflow-y: auto; min-height: 160px; max-height: 300px; background: #fdfaf5; border-radius: 12px; padding: 14px; margin-bottom: 12px; border: 1px solid var(--border); display: flex; flex-direction: column; gap: 10px; }
        .chat-bubble { max-width: 85%; padding: 10px 14px; border-radius: 18px; line-height: 1.5; font-size: 0.93em; animation: popIn 0.25s; }
        .chat-bubble.user { align-self: flex-end; background: #e8f0fe; color: #1a3a5c; }
        .chat-bubble.patient { align-self: flex-start; background: #f5eee0; color: #4a3b2c; }
        .chat-input-area { display: flex; gap: 8px; }
        .chat-input-area input { flex: 1; padding: 12px 16px; border-radius: 24px; border: 2px solid var(--border); font-size: 0.95em; background: #fffefb; outline: none; }
        .chat-input-area button { padding: 10px 20px; border-radius: 24px; background: var(--primary); color: #fff; border: none; cursor: pointer; font-weight: 600; }
        .inquiry-hint { font-size: 12px; color: #9b8579; margin: 10px 2px 0; line-height: 1.6; }
        .data-card { background: #fff; border: 1px solid #e8dcc8; border-radius: 16px; padding: 18px; margin-top: 18px; }
        .data-stats { font-size: 15px; color: #5b4636; margin: 8px 0 14px; }
        .data-actions { display: flex; flex-wrap: wrap; gap: 10px; }
        .data-actions button { padding: 10px 16px; border-radius: 12px; border: 2px solid var(--border); background: #fffefb; color: var(--text-light); font-size: 0.9em; cursor: pointer; font-family: var(--font-body); transition: var(--transition); }
        .data-actions button:hover { border-color: var(--primary-light); color: var(--primary); }
        .site-header { width: 100%; max-width: 720px; position: relative; z-index: 1; margin-bottom: 4px; }
        .site-footer { position: fixed; bottom: 14px; right: 20px; z-index: 999; }
        .copyright { font-size: 0.8em; color: #b5a595; letter-spacing: 0.06em; font-family: var(--font-heading); pointer-events: none; background: rgba(253,248,243,0.7); padding: 4px 10px; border-radius: 12px; backdrop-filter: blur(4px); }
        .top-nav { display: flex; gap: 8px; flex-wrap: wrap; justify-content: center; margin-bottom: 4px; }
        .top-nav .nav-link { font-size: 0.85em; color: var(--text-muted); cursor: pointer; padding: 6px 14px; border-radius: 16px; font-family: var(--font-heading); border: 1px solid transparent; background: transparent; }
        .top-nav .nav-link:hover { color: var(--primary); background: rgba(139,69,19,0.05); }
        .top-nav .nav-link.nav-active { color: var(--accent); font-weight: 700; background: rgba(192,57,43,0.06); border-color: rgba(192,57,43,0.2); }
        .case-full { font-size: 0.92em; line-height: 1.7; color: var(--text-light); }
        .case-full strong { color: var(--primary); }
        .bank-block { margin: 6px 0 10px; }
        .bank-label { font-weight: 700; color: var(--primary); font-size: 0.82em; margin-bottom: 6px; }
        .bank-nav-wrap, .bank-chip-wrap { display: flex; flex-wrap: wrap; gap: 6px; }
        .bank-nav { border: 2px solid var(--border); background: #fffefb; color: var(--text-light); border-radius: 20px; padding: 6px 12px; font-size: 0.85em; cursor: pointer; font-family: var(--font-body); transition: var(--transition); }
        .bank-nav:hover { border-color: var(--primary-light); color: var(--primary); }
        .bank-nav.active { background: rgba(139,69,19,0.12); border-color: var(--primary); color: var(--primary); font-weight: 700; }
        .bank-chip { border: 1px solid var(--border); background: #fffefb; color: var(--text-muted); border-radius: 14px; padding: 4px 10px; font-size: 0.8em; cursor: pointer; font-family: var(--font-body); transition: var(--transition); }
        .bank-chip:hover { border-color: var(--primary-light); color: var(--primary); }
        .bank-chip.active { background: rgba(139,69,19,0.1); border-color: var(--primary-light); color: var(--primary); font-weight: 600; }
        .bank-summary { font-size: 0.85em; color: var(--text-muted); margin: 4px 0 8px; }
        .case-tag { display: inline-block; background: rgba(139,69,19,0.08); color: var(--primary); padding: 1px 8px; border-radius: 10px; font-size: 0.8em; font-weight: 600; margin-right: 4px; }
        .case-tag-cat { background: rgba(184,134,11,0.1); color: var(--gold); }
        .btn--sm { padding: 6px 12px; font-size: 0.85em; }
        .case-bank-item .btn--sm { animation: none; }
        .submission-form { display: flex; flex-direction: column; gap: 12px; }
        .submission-form label { font-weight: 600; color: var(--text-light); font-size: 0.9em; }
        .submission-form input[type="text"], .submission-form textarea { width: 100%; padding: 10px 14px; border-radius: 10px; border: 2px solid var(--border); font-size: 0.95em; background: #fffefb; outline: none; transition: var(--transition); font-family: var(--font-body); }
        .submission-form input[type="text"]:focus, .submission-form textarea:focus { border-color: var(--primary-light); box-shadow: 0 0 0 4px rgba(139,69,19,0.07); }
        .submission-form textarea { min-height: 80px; resize: vertical; }
        .submission-form .required-star { color: var(--accent); }
        .submission-form .form-row { display: flex; gap: 12px; flex-wrap: wrap; }
        .submission-form .form-row > div { flex: 1; min-width: 160px; }
        .submission-form .file-input { border: 2px dashed var(--border); padding: 10px; border-radius: 10px; background: #fdfaf5; }
        .submission-form .file-input input[type="file"] { width: 100%; }
        .submission-form .btn-submit { width: 100%; padding: 14px; font-size: 1.1em; border-radius: 28px; background: var(--primary); color: #fff; border: none; cursor: pointer; font-weight: 700; transition: var(--transition); }
        .submission-form .btn-submit:hover { background: var(--primary-light); }
        .submission-form .form-hint { font-size: 0.8em; color: var(--text-muted); }
        .difficulty-select { position: relative; }
        .difficulty-select-display { padding: 10px 14px; border: 2px solid var(--border); border-radius: 10px; background: #fffefb; cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: var(--transition); }
        .difficulty-select-display:hover { border-color: var(--primary-light); }
        .difficulty-select-display .arrow { color: var(--text-muted); font-size: 0.8em; }
        .difficulty-options { position: absolute; top: 100%; left: 0; right: 0; background: #fffefb; border: 2px solid var(--border); border-top: none; border-radius: 0 0 10px 10px; z-index: 10; box-shadow: 0 6px 16px rgba(0,0,0,0.08); }
        .difficulty-option { display: block; width: 100%; padding: 10px 14px; border: none; background: none; text-align: left; cursor: pointer; font-family: var(--font-body); font-size: 0.95em; color: var(--text); transition: background 0.2s; }
        .difficulty-option:hover { background: rgba(139,69,19,0.06); }
        .difficulty-option.selected { background: rgba(139,69,19,0.1); font-weight: 600; }
        .tongue-judge-form { display: flex; flex-direction: column; gap: 8px; margin: 8px 0 0; }
        .tongue-judge-form textarea { width: 100%; padding: 10px 12px; border-radius: 10px; border: 2px solid var(--border); font-size: 0.95em; font-family: var(--font-body); line-height: 1.7; background: #fffefb; outline: none; resize: vertical; box-sizing: border-box; }
        .tongue-judge-form textarea:focus { border-color: var(--primary-light); box-shadow: 0 0 0 3px rgba(139,69,19,0.07); }
        .tongue-badge { position: absolute; top: 10px; left: 10px; font-size: 0.72em; font-weight: 700; color: #fff; background: rgba(139,69,19,0.85); padding: 3px 10px; border-radius: 12px; letter-spacing: 0.04em; z-index: 5; }
        .tongue-img-wrap { position: relative; display: inline-block; }
        .wrong-card { padding: 14px; margin: 10px 0; background: #fffefb; border-radius: 12px; border: 1px solid var(--border); border-left: 4px solid var(--accent); font-size: 0.9em; line-height: 1.7; }
        .wrong-card .wrong-title { font-weight: 700; color: var(--accent); margin-bottom: 4px; }
        .wrong-card .wrong-meta { color: var(--text-muted); font-size: 0.8em; margin-bottom: 4px; }
        .wrong-card .wrong-actions { display: flex; gap: 8px; margin-top: 10px; flex-wrap: wrap; }
        .btn--sm { padding: 8px 16px; font-size: 0.85em; border-radius: 20px; }
        .source-tag { display: inline-block; background: rgba(184,134,11,0.1); color: var(--gold); padding: 2px 10px; border-radius: 12px; font-size: 0.85em; font-weight: 600; }