/* 衍枢 — 古典 AI 详参 */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{font-size:15px;scroll-behavior:smooth}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB","Helvetica Neue",sans-serif;font-weight:450;background:#f8f6f0;color:#2c2c2c;line-height:1.8;min-height:100vh;display:flex;flex-direction:column}
a{color:#8b3a3a;text-decoration:none}
a:hover{color:#c0392b}

/* Header */
.header{background:#2c1818;color:#e8dcc8;padding:0 1rem;border-bottom:2px solid #8b4513}
.header-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;justify-content:space-between;height:56px}
.logo a{font-size:1.4rem;font-weight:bold;color:#e8dcc8;letter-spacing:2px}
.logo a:hover{color:#d4a574}
.logo-sub{font-size:.65rem;color:#a08060;margin-left:6px;letter-spacing:1px}
.nav{display:flex;gap:4px;align-items:center}
.nav a{color:#c8b898;padding:6px 12px;font-size:.85rem;border-radius:4px;transition:all .15s}
.nav a:hover{color:#e8dcc8;background:rgba(255,255,255,.08)}

/* Main */
.main{flex:1;max-width:1100px;width:100%;margin:0 auto;padding:1.5rem 1rem 3rem}

/* Book Grid */
.page-title{text-align:center;margin:1rem 0 2rem}
.page-title h1{font-size:1.6rem;color:#2c1818;font-weight:bold}
.subtitle{color:#8b7355;font-size:.85rem;margin-top:4px}
.book-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.book-card{background:#fff;border:1px solid #ddd8c8;border-radius:6px;padding:1.2rem;transition:all .15s;display:flex;flex-direction:column;gap:6px}
.book-card:hover{border-color:#c0392b;box-shadow:0 2px 8px rgba(0,0,0,.08);transform:translateY(-1px)}
.book-card-title{font-size:1.05rem;font-weight:bold;color:#2c1818}
.book-card-chapters{font-size:.8rem;color:#8b7355}

/* Book Detail */
.breadcrumb{font-size:.8rem;color:#8b7355;margin-bottom:1rem;padding:6px 0;border-bottom:1px solid #e8e0d0}
.breadcrumb a{color:#8b7355}
.breadcrumb a:hover{color:#8b3a3a}
.book-header{margin-bottom:1.5rem}
.book-header h1{font-size:1.5rem;color:#2c1818}
.book-author{color:#8b7355;font-size:.85rem;margin-top:4px}
.book-desc{color:#666;font-size:.85rem;margin-top:8px;line-height:1.7}
.book-count{color:#8b7355;font-size:.8rem;margin-top:6px}
.chapter-list{display:flex;flex-direction:column;gap:3px}
.chapter-item{display:flex;align-items:center;gap:10px;padding:8px 12px;background:#fff;border:1px solid #eee8d8;border-radius:4px;transition:all .1s;font-size:.9rem}
.chapter-item:hover{border-color:#c0392b;background:#fdf8f0}
.chapter-num{color:#8b7355;font-size:.75rem;min-width:2rem;text-align:right}
.chapter-title{color:#2c1818}

/* Chapter */
.chapter-header{margin-bottom:1.5rem}
.chapter-header h1{font-size:1.4rem;color:#2c1818}
.chapter-author{color:#8b7355;font-size:.8rem;margin-top:2px}
.chapter-content{background:#fff;border:1px solid #e8e0d0;border-radius:6px;padding:1.5rem 2rem;min-height:300px}
.text-para{margin-bottom:1rem;text-indent:2em;line-height:2;cursor:pointer;transition:background .15s;padding:2px 4px;border-radius:3px}
.text-para:hover{background:#f5f0e0}
.text-para.selected{background:#f0e4c8;outline:2px solid #d4a574}
.chapter-actions{margin-top:1rem;display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.credit-hint{font-size:.8rem;color:#8b7355}

/* Buttons */
.btn{display:inline-block;padding:8px 18px;border-radius:5px;border:1px solid #ccc0b0;background:#fff;color:#2c1818;cursor:pointer;font-size:.9rem;transition:all .15s;font-family:inherit}
.btn:hover{border-color:#8b3a3a;background:#f5ede0}
.btn-primary{background:#8b3a3a;color:#fff;border-color:#8b3a3a}
.btn-primary:hover{background:#a04040}
.btn-ai{background:#d4a574;color:#fff;border-color:#d4a574}
.btn-ai:hover{background:#c08a5a}
.btn-lg{padding:10px 32px;font-size:1rem}
.btn:disabled{opacity:.5;cursor:not-allowed}
.btn-mode.active{background:#2c1818;color:#e8dcc8;border-color:#2c1818}

/* Commentary */
.commentary-box{background:#fffbf0;border:1px solid #e8dcc0;border-radius:6px;padding:1.2rem 1.5rem;margin-top:1rem}
.commentary-text{font-size:.9rem;line-height:1.9;color:#2c2c2c}
.commentary-text br{margin-bottom:6px}
.commentary-loading{color:#8b7355;font-size:.85rem;padding:6px 0}

/* Divination */
.divination-form{max-width:500px;margin:0 auto}
.form-group{margin-bottom:1rem}
.form-group label{display:block;font-size:.85rem;color:#8b7355;margin-bottom:4px}
.form-input{width:100%;padding:8px 12px;border:1px solid #ddd8c8;border-radius:5px;font-size:.9rem;font-family:inherit;background:#fff}
.form-input:focus{outline:none;border-color:#8b3a3a}
.mode-switch{display:flex;gap:6px}
.yao-selectors{display:flex;flex-direction:column;gap:6px}
.yao-row{display:flex;align-items:center;gap:10px}
.yao-label{width:40px;font-size:.85rem;color:#666}
.yao-select{padding:4px 8px;border:1px solid #ddd8c8;border-radius:4px;font-family:inherit;font-size:.85rem}
.auth-form{max-width:360px;margin:0 auto;display:flex;flex-direction:column;gap:10px}
.auth-form input{padding:10px 14px;border:1px solid #ddd8c8;border-radius:5px;font-size:.9rem;font-family:inherit}
.auth-form input:focus{outline:none;border-color:#8b3a3a}
.auth-form button{padding:10px;background:#8b3a3a;color:#fff;border:none;border-radius:5px;font-size:.95rem;cursor:pointer;font-family:inherit}
.auth-form button:hover{background:#a04040}
.form-page{max-width:400px;margin:3rem auto;text-align:center}
.form-page h1{font-size:1.3rem;margin-bottom:1.5rem;color:#2c1818}
.form-link{font-size:.85rem;color:#8b7355;margin-top:1rem}
.form-link a{color:#8b3a3a}

/* Flash */
.flash-list{margin-bottom:1rem}
.flash{padding:10px 14px;border-radius:5px;margin-bottom:6px;font-size:.85rem}
.flash.success{background:#e8f5e0;color:#2e7d32;border:1px solid #a5d6a7}
.flash.error{background:#fde8e8;color:#c62828;border:1px solid #ef9a9a}
.flash.warning{background:#fff8e1;color:#e65100;border:1px solid #ffe082}

/* Result */
.result-page{max-width:900px;margin:0 auto}
.result-header h1{font-size:1.3rem;margin-bottom:1rem}
.result-meta{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:1rem;padding:12px 16px;background:#fff;border:1px solid #e8e0d0;border-radius:6px}
.gua-name{font-size:1.2rem;font-weight:bold;color:#2c1818}
.gua-gong{font-size:.8rem;color:#8b7355;font-weight:normal}
.gua-he{font-size:.8rem;color:#d4a574;font-weight:bold}
.gua-ganzhi{font-size:.8rem;color:#666;margin-left:auto}
.yao-table{overflow-x:auto;margin-bottom:1rem}
.yao-table table{width:100%;border-collapse:collapse;font-size:.8rem;background:#fff;border:1px solid #e0d8c8}
.yao-table th{background:#f5f0e0;padding:8px 6px;text-align:center;border-bottom:2px solid #ddd8c8;font-weight:600;color:#5a4a3a;white-space:nowrap}
.yao-table td{padding:7px 6px;text-align:center;border-bottom:1px solid #f0e8d8}
.tr-shi{background:#fffbe6!important}
.tr-ying{background:#eef4ff!important}
.tr-dong{background:#fff0e0!important}
.fu{color:#c0392b;font-size:.7rem}
.wx-木{color:#2e7d32;font-weight:bold}
.wx-火{color:#c62828;font-weight:bold}
.wx-土{color:#795548;font-weight:bold}
.wx-金{color:#b8860b;font-weight:bold}
.wx-水{color:#1565c0;font-weight:bold}
.result-actions{display:flex;gap:8px;flex-wrap:wrap;align-items:center;margin-bottom:1rem}
.result-actions .form-group{flex:1;margin-bottom:0}

/* Profile */
.profile-card{background:#fff;border:1px solid #e8e0d0;border-radius:6px;padding:1.2rem 1.5rem;margin-bottom:1.5rem}
.profile-card p{margin-bottom:6px;font-size:.95rem}
.credits{color:#c0392b;font-size:1.2rem}
.credit-note{font-size:.8rem;color:#8b7355}
.profile-sections{display:grid;gap:1.5rem}
.profile-section{background:#fff;border:1px solid #e8e0d0;border-radius:6px;padding:1rem 1.2rem}
.profile-section h2{font-size:1rem;color:#2c1818;margin-bottom:.8rem;border-bottom:1px solid #eee8d8;padding-bottom:6px}
.history-list{display:flex;flex-direction:column;gap:4px}
.history-item{display:flex;gap:10px;align-items:center;padding:6px 8px;font-size:.82rem;border-bottom:1px solid #f5f0e5}
.history-item:last-child{border:none}
.h-gua{font-weight:bold;min-width:120px;color:#2c1818}
.h-type{min-width:60px;font-weight:bold}
.h-qiu{color:#666;flex:1;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.h-credits{color:#c0392b;min-width:40px;text-align:right}
.h-time{color:#999;min-width:70px;text-align:right;font-size:.75rem}
.empty{color:#999;font-size:.85rem;padding:1rem 0}

/* Settings */
.settings-card{max-width:500px;margin:0 auto;background:#fff;border:1px solid #e8e0d0;border-radius:6px;padding:1.5rem}
.settings-note{font-size:.82rem;color:#8b7355;margin-bottom:1.2rem;line-height:1.6}
.settings-form .form-group{margin-bottom:1rem}

/* Error */
.error-page{text-align:center;padding:4rem 0}
.error-page h1{font-size:1.3rem;color:#666;margin-bottom:1rem}

/* Footer */
.footer{background:#2c1818;color:#8b7355;text-align:center;padding:1rem;font-size:.75rem;margin-top:auto}

/* Responsive */
@media(max-width:640px){
  .header-inner{flex-wrap:wrap;height:auto;padding:8px 0;gap:6px}
  .nav{gap:2px;flex-wrap:wrap}
  .nav a{font-size:.75rem;padding:4px 8px}
  .book-grid{grid-template-columns:1fr}
  .chapter-content{padding:1rem}
  .yao-table table{font-size:.7rem}
  .yao-table td,.yao-table th{padding:4px 3px}
}

/* ─── 首页 Hero ─── */
.hero{text-align:center;padding:4rem 1rem 3rem;background:linear-gradient(180deg,#2c1818 0%,#3d2222 40%,#f8f6f0 100%);color:#e8dcc8;margin:-1.5rem -1rem 2rem}
.hero-brand{font-size:2.8rem;font-weight:bold;letter-spacing:8px;margin-bottom:.5rem;color:#d4a574}
.hero-tagline{font-size:1.1rem;letter-spacing:3px;color:#c8b898;margin-bottom:1.2rem}
.hero-desc{max-width:520px;margin:0 auto 1.8rem;font-size:.9rem;line-height:1.8;color:#b8a888}
.hero-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.hero-actions .btn{min-width:140px;padding:10px 24px}
.hero-actions .btn-primary{background:#d4a574;border-color:#d4a574;color:#2c1818}
.hero-actions .btn-primary:hover{background:#c08a5a;color:#2c1818}
.hero-actions .btn:not(.btn-primary){border-color:#8b7355;color:#c8b898}
.hero-actions .btn:not(.btn-primary):hover{background:rgba(255,255,255,.08);color:#e8dcc8}

/* ─── 三个模块 ─── */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin-bottom:2.5rem}
.feature-card{background:#fff;border:1px solid #e8e0d0;border-radius:8px;padding:1.5rem;text-align:center;transition:all .15s}
.feature-card:hover{border-color:#c0392b;box-shadow:0 2px 12px rgba(0,0,0,.06);transform:translateY(-2px)}
.feature-icon{font-size:2rem;margin-bottom:.6rem}
.feature-card h3{font-size:1.05rem;color:#2c1818;margin-bottom:.5rem}
.feature-card p{font-size:.82rem;color:#666;line-height:1.7}

/* ─── 计价 ─── */
.pricing-info{text-align:center;padding:2rem 1rem;margin-bottom:2rem;background:#fff;border:1px solid #e8e0d0;border-radius:8px}
.pricing-info h2{font-size:1.15rem;color:#2c1818;margin-bottom:.5rem}
.pricing-sub{font-size:.85rem;color:#8b7355;margin-bottom:1rem}

/* ─── 典籍库 ─── */
.books-section{margin-bottom:2rem}
.books-section h2{font-size:1.15rem;color:#2c1818;margin-bottom:1rem;display:flex;align-items:center;gap:8px}
.books-section h2 .sub{font-size:.8rem;color:#8b7355;font-weight:normal}

@media(max-width:768px){
  .features{grid-template-columns:1fr}
  .hero-brand{font-size:2rem}
  .hero-tagline{font-size:.95rem}
}