:root{--primary: #0066ff;--primary-light: #e6f0ff;--primary-hover: #0052cc;--primary-soft: rgba(0, 102, 255, .08);--bg: #f6f6f6;--bg-card: #ffffff;--bg-hover: #f9f9f9;--bg-active: #f0f7ff;--ink: #121212;--ink-primary: #1a1a1a;--ink-secondary: #444444;--ink-tertiary: #8590a6;--ink-quaternary: #bfbfbf;--border: #ebebeb;--border-light: #f0f0f0;--divider: #e5e5e5;--red: #f1403c;--green: #12b37d;--gold: #faad14;--shadow: 0 1px 3px rgba(18, 18, 18, .04);--shadow-card: 0 2px 8px rgba(18, 18, 18, .06);--shadow-hover: 0 4px 16px rgba(18, 18, 18, .1);--shadow-modal: 0 8px 32px rgba(18, 18, 18, .16);--radius: 8px;--radius-lg: 12px;--radius-sm: 4px;--font: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-serif: "Noto Serif SC", "Source Han Serif SC", Georgia, serif}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font);background:var(--bg);color:var(--ink-primary);line-height:1.6;min-height:100vh;-webkit-font-smoothing:antialiased}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:var(--ink-quaternary);border-radius:3px}::-webkit-scrollbar-thumb:hover{background:var(--ink-tertiary)}.header{position:sticky;top:0;z-index:100;background:var(--bg-card);border-bottom:1px solid var(--border);padding:0 24px;height:56px;display:flex;align-items:center;gap:20px}.header-logo{font-size:20px;font-weight:700;color:var(--primary);text-decoration:none;white-space:nowrap;flex-shrink:0;letter-spacing:1px}.header-nav{display:flex;gap:4px;list-style:none}.header-nav a{display:inline-flex;align-items:center;gap:4px;padding:6px 14px;border-radius:var(--radius);color:var(--ink-secondary);text-decoration:none;font-size:14px;font-weight:500;transition:all .15s}.header-nav a:hover{color:var(--ink-primary);background:var(--bg-hover)}.header-nav a.active{color:var(--primary);background:var(--primary-light);font-weight:600}.header-search{flex:1;max-width:360px;display:flex;align-items:center;background:var(--bg);border:1px solid var(--border);border-radius:20px;padding:0 14px;gap:8px;height:36px;transition:all .15s}.header-search:focus-within{border-color:var(--primary);background:var(--bg-card)}.header-search input{flex:1;border:none;background:transparent;outline:none;font-size:13px;color:var(--ink-primary)}.header-search input::placeholder{color:var(--ink-quaternary)}.header-search-icon{font-size:13px;color:var(--ink-quaternary);cursor:pointer}.header-actions{display:flex;align-items:center;gap:10px}.main{max-width:1100px;margin:0 auto;padding:24px;min-height:calc(100vh - 56px)}.stories-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.story-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:20px;cursor:pointer;transition:all .2s;display:flex;flex-direction:column;gap:10px;box-shadow:var(--shadow-card)}.story-card:hover{border-color:var(--primary);box-shadow:var(--shadow-hover);transform:translateY(-1px)}.story-card-title{font-size:16px;font-weight:600;color:var(--ink-primary);line-height:1.4}.story-card-desc{font-size:14px;color:var(--ink-secondary);line-height:1.6;overflow:hidden;text-overflow:ellipsis;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical}.story-card-meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--ink-tertiary);margin-top:4px}.filter-bar{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:20px}.filter-chip{padding:6px 16px;border-radius:16px;border:1px solid var(--border);background:var(--bg-card);color:var(--ink-secondary);font-size:13px;cursor:pointer;transition:all .15s;font-weight:500}.filter-chip:hover{border-color:var(--primary);color:var(--primary)}.filter-chip.active{background:var(--primary);border-color:var(--primary);color:#fff;font-weight:600}.btn{display:inline-flex;align-items:center;justify-content:center;gap:4px;padding:8px 16px;border-radius:var(--radius);border:1px solid transparent;font-size:14px;font-weight:500;cursor:pointer;transition:all .15s;font-family:var(--font);text-decoration:none;white-space:nowrap;line-height:1.4}.btn:disabled{opacity:.5;cursor:not-allowed}.btn-primary{background:var(--primary);color:#fff}.btn-primary:hover:not(:disabled){background:var(--primary-hover)}.btn-ghost{background:transparent;color:var(--ink-secondary);border-color:var(--border)}.btn-ghost:hover:not(:disabled){background:var(--bg-hover);border-color:var(--primary);color:var(--primary)}.btn-danger{background:var(--red);color:#fff}.btn-danger:hover:not(:disabled){opacity:.85}.btn-sm{padding:5px 12px;font-size:13px}.loading{display:flex;align-items:center;justify-content:center;gap:8px;padding:60px}.loading-dot{width:8px;height:8px;background:var(--primary);border-radius:50%;animation:loading-bounce 1.4s ease-in-out infinite both}.loading-dot:nth-child(1){animation-delay:-.32s}.loading-dot:nth-child(2){animation-delay:-.16s}.loading-dot:nth-child(3){animation-delay:0s}@keyframes loading-bounce{0%,80%,to{transform:scale(0);opacity:.4}40%{transform:scale(1);opacity:1}}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;gap:12px;text-align:center}.empty-state-icon{font-size:40px;opacity:.5}.empty-state-text{font-size:14px;color:var(--ink-tertiary)}.toast{position:fixed;bottom:32px;left:50%;transform:translate(-50%);background:var(--ink-primary);color:#fff;padding:10px 24px;border-radius:24px;font-size:14px;z-index:9999;box-shadow:var(--shadow-modal);animation:toast-in .2s ease}@keyframes toast-in{0%{opacity:0;transform:translate(-50%) translateY(10px)}to{opacity:1;transform:translate(-50%) translateY(0)}}.modal-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000073;z-index:500;display:flex;align-items:center;justify-content:center;padding:20px}.modal{background:var(--bg-card);border-radius:var(--radius-lg);box-shadow:var(--shadow-modal);max-width:520px;width:100%;max-height:85vh;overflow-y:auto}.modal-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px 16px;border-bottom:1px solid var(--border)}.modal-title{font-size:17px;font-weight:600;color:var(--ink-primary);flex:1}.modal-close{background:none;border:none;font-size:18px;color:var(--ink-quaternary);cursor:pointer;padding:4px;border-radius:var(--radius-sm);line-height:1}.modal-close:hover{color:var(--ink-primary);background:var(--bg-hover)}.modal-body{padding:20px 24px}.modal-content{font-size:14px;color:var(--ink-secondary);line-height:1.8;white-space:pre-wrap;word-break:break-word;margin-bottom:12px}.modal-meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--ink-tertiary);margin-bottom:16px}.modal-actions{display:flex;gap:8px;justify-content:flex-end}.form-group{display:flex;flex-direction:column;gap:6px}.form-label{font-size:13px;font-weight:500;color:var(--ink-secondary)}.form-input{border:1px solid var(--border);border-radius:var(--radius);padding:10px 14px;font-size:14px;color:var(--ink-primary);background:var(--bg);outline:none;transition:all .15s;font-family:var(--font);width:100%}.form-input:focus{border-color:var(--primary);background:var(--bg-card);box-shadow:0 0 0 3px var(--primary-soft)}.form-input::placeholder{color:var(--ink-quaternary)}.form-error{font-size:13px;color:var(--red);padding:4px 0}.auth-modal{max-width:400px}.auth-tabs{display:flex;border-bottom:1px solid var(--border)}.auth-tab{flex:1;padding:14px;background:none;border:none;font-size:15px;font-weight:500;color:var(--ink-tertiary);cursor:pointer;border-bottom:2px solid transparent;margin-bottom:-1px;transition:all .15s;font-family:var(--font)}.auth-tab:hover{color:var(--ink-secondary)}.auth-tab.active{color:var(--primary);border-bottom-color:var(--primary)}.auth-form{padding:20px 24px 24px;display:flex;flex-direction:column;gap:14px}.auth-form .btn{width:100%;padding:11px;font-size:15px}.new-story-form{padding:20px 24px;display:flex;flex-direction:column;gap:14px}.write-form{position:fixed;bottom:0;left:0;right:0;background:var(--bg-card);border-top:2px solid var(--primary);padding:16px 24px 20px;box-shadow:0 -4px 24px #00000014;z-index:300}.write-form-header{display:flex;align-items:center;justify-content:space-between;margin-bottom:10px}.write-form-title{font-size:13px;color:var(--primary);font-weight:600}.write-textarea{width:100%;border:1px solid var(--border);border-radius:var(--radius);padding:12px 16px;font-size:14px;color:var(--ink-primary);background:var(--bg);outline:none;resize:none;line-height:1.6;font-family:var(--font);transition:all .15s}.write-textarea:focus{border-color:var(--primary);background:var(--bg-card);box-shadow:0 0 0 3px var(--primary-soft)}.write-textarea::placeholder{color:var(--ink-quaternary)}.write-form-footer{display:flex;align-items:center;justify-content:space-between;margin-top:10px}.char-count{font-size:12px;color:var(--ink-tertiary)}.rank-list{display:flex;flex-direction:column;gap:10px}.rank-item{display:flex;align-items:center;gap:14px;background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);padding:14px 16px;cursor:pointer;transition:all .15s}.rank-item:hover{border-color:var(--primary);box-shadow:var(--shadow-card)}.rank-num{width:28px;height:28px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:13px;font-weight:700;background:var(--bg);color:var(--ink-tertiary);flex-shrink:0}.rank-num.top1{background:gold;color:#7a6000}.rank-num.top2{background:silver;color:#555}.rank-num.top3{background:#cd7f32;color:#fff}.rank-content{flex:1;min-width:0}.rank-content-text{font-size:14px;color:var(--ink-primary);line-height:1.4;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.rank-content-meta{font-size:12px;color:var(--ink-tertiary);margin-top:3px}.rank-like{font-size:13px;color:var(--red);font-weight:600;white-space:nowrap}.avatar{width:32px;height:32px;border-radius:50%;background:var(--primary-light);color:var(--primary);display:flex;align-items:center;justify-content:center;font-weight:600;font-size:13px;cursor:default;border:2px solid var(--primary)}.tree-page{display:flex;gap:0;min-height:calc(100vh - 56px);background:var(--bg)}.tree-sidebar{width:320px;flex-shrink:0;background:var(--bg-card);border-right:1px solid var(--border);padding:24px;overflow-y:auto;height:calc(100vh - 56px);position:sticky;top:56px}.tree-sidebar-header{display:flex;align-items:center;gap:8px;margin-bottom:20px;padding-bottom:16px;border-bottom:1px solid var(--border)}.tree-sidebar-title{font-size:18px;font-weight:700;color:var(--ink-primary);line-height:1.4}.tree-sidebar-desc{font-size:14px;color:var(--ink-secondary);line-height:1.6;margin-bottom:16px}.tree-sidebar-meta{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--ink-tertiary);margin-bottom:16px}.sidebar-root-content{background:var(--bg);border-radius:var(--radius);padding:16px;margin-bottom:20px;border:1px solid var(--border)}.sidebar-root-label{font-size:12px;font-weight:600;color:var(--primary);margin-bottom:8px;text-transform:uppercase;letter-spacing:.5px}.sidebar-root-text{font-size:14px;color:var(--ink-primary);line-height:1.7;word-break:break-all;margin-bottom:10px}.sidebar-root-meta{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--ink-tertiary)}.sidebar-section-title{font-size:13px;font-weight:600;color:var(--ink-tertiary);margin-bottom:10px;padding-bottom:8px;border-bottom:1px solid var(--border)}.sidebar-branch-list{display:flex;flex-direction:column;gap:8px}.sidebar-branch-item{padding:12px 14px;border-radius:var(--radius);border:1px solid var(--border);background:var(--bg-card);cursor:pointer;transition:all .15s;position:relative}.sidebar-branch-item:hover{border-color:var(--primary);background:var(--bg-active)}.sidebar-branch-item.active{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 2px var(--primary-soft)}.sidebar-branch-item:before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:transparent;border-radius:var(--radius-sm) 0 0 var(--radius-sm)}.sidebar-branch-item.active:before{background:var(--primary)}.sidebar-branch-content{font-size:14px;color:var(--ink-primary);line-height:1.5;word-break:break-all}.sidebar-branch-meta{display:flex;align-items:center;gap:8px;font-size:12px;color:var(--ink-tertiary);margin-top:6px}.tree-content{flex:1;padding:24px;overflow-x:auto;overflow-y:auto;height:calc(100vh - 56px);min-width:0}.mm-canvas{display:flex;gap:20px;min-width:max-content;align-items:flex-start}.mm-column{width:260px;flex-shrink:0;display:flex;flex-direction:column;gap:12px;max-height:calc(100vh - 120px);overflow-y:auto;padding-right:4px}.mm-col-header{font-size:13px;font-weight:600;color:var(--ink-tertiary);padding:8px 0;border-bottom:2px solid var(--border);margin-bottom:4px;text-transform:uppercase;letter-spacing:.5px}.mm-node{cursor:pointer;border-radius:var(--radius);transition:all .2s;background:var(--bg-card);border:1px solid var(--border);padding:14px;display:flex;flex-direction:column;gap:8px;box-shadow:var(--shadow-card);position:relative}.mm-node:hover{border-color:var(--primary);box-shadow:var(--shadow-hover);transform:translateY(-1px)}.mm-node.selected{border-color:var(--primary);background:var(--primary-light);box-shadow:0 0 0 3px var(--primary-soft)}.mm-node-header{display:flex;align-items:center;gap:8px}.mm-level-tag{font-size:11px;font-weight:600;color:var(--primary);background:var(--primary-light);border-radius:var(--radius-sm);padding:2px 8px;flex-shrink:0}.mm-expand-hint{font-size:11px;color:var(--ink-tertiary);font-weight:600;margin-left:auto;transition:all .15s}.mm-expand-hint.expanded{color:var(--primary)}.mm-node-content{font-size:14px;color:var(--ink-primary);line-height:1.6;word-break:break-all}.mm-node-footer{display:flex;align-items:center;gap:10px;font-size:12px;color:var(--ink-tertiary);padding-top:8px;border-top:1px solid var(--border-light)}.mm-author{color:var(--primary);font-weight:500}.mm-like{color:var(--red);font-weight:600}.mm-node-actions{display:flex;gap:8px;flex-wrap:wrap}.mm-connector{position:absolute;left:-20px;top:50%;width:20px;height:2px;background:var(--border)}.mm-column:not(:first-child){position:relative;padding-left:20px}.mm-column:not(:first-child):before{content:"";position:absolute;left:0;top:40px;bottom:20px;width:2px;background:var(--border)}.mm-read-more{display:inline-block;font-size:13px;color:var(--primary);cursor:pointer;background:none;border:none;padding:0;text-decoration:none;font-weight:500}.mm-read-more:hover{text-decoration:underline}.full-content-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#00000080;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.full-content-modal{background:var(--bg-card);border-radius:var(--radius-lg);padding:28px 32px;max-width:640px;width:100%;max-height:75vh;overflow-y:auto;box-shadow:var(--shadow-modal)}.fcm-level{font-size:12px;font-weight:600;color:var(--primary);background:var(--primary-light);display:inline-block;padding:4px 10px;border-radius:var(--radius-sm);margin-bottom:12px}.fcm-content{font-size:16px;line-height:2;color:var(--ink-primary);white-space:pre-wrap;word-break:break-word;margin-bottom:24px;font-family:var(--font-serif)}.fcm-footer{display:flex;align-items:center;gap:12px;font-size:13px;color:var(--ink-tertiary);border-top:1px solid var(--border);padding-top:16px;flex-wrap:wrap}.fcm-actions{margin-left:auto;display:flex;gap:8px}.story-root-card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius-lg);padding:32px;max-width:680px;margin:0 auto 24px;text-align:center;box-shadow:var(--shadow-card);cursor:pointer;transition:all .2s}.story-root-card:hover{border-color:var(--primary);box-shadow:var(--shadow-hover)}.story-root-title{font-size:24px;font-weight:700;color:var(--ink-primary);margin-bottom:12px}.story-root-desc{font-size:15px;color:var(--ink-secondary);line-height:1.7;margin-bottom:20px}.story-root-hint{display:inline-flex;align-items:center;gap:6px;font-size:14px;color:var(--primary);font-weight:600;padding:8px 20px;background:var(--primary-light);border-radius:20px}.breadcrumb{display:flex;align-items:center;gap:8px;margin-bottom:20px;font-size:14px}.breadcrumb a{color:var(--primary);text-decoration:none;font-weight:500}.breadcrumb a:hover{text-decoration:underline}.breadcrumb-sep{color:var(--ink-quaternary)}.breadcrumb-current{color:var(--ink-tertiary)}@media (max-width: 768px){.header{padding:0 16px;gap:10px;height:52px}.header-search,.header-nav a span{display:none}.header-nav a{padding:6px 10px}.stories-grid{grid-template-columns:1fr}.main{padding:16px}.tree-page{flex-direction:column}.tree-sidebar{width:100%;max-height:none;position:static;border-right:none;border-bottom:1px solid var(--border)}.tree-content{padding:16px}.mm-canvas{flex-direction:column}.mm-column{width:100%;padding-left:0!important}.mm-column:before{display:none}.mm-col-header{display:none}.modal{max-width:100%;margin:0;border-radius:var(--radius-lg) var(--radius-lg) 0 0;max-height:90vh}.story-root-card{padding:24px}.story-root-title{font-size:20px}}