:root{--body-bg: #E8E6E1;--bg-primary: #FAFAFA;--bg-secondary: #F2F2F4;--bg-tertiary: #FFFFFF;--sidebar-bg: #191D2B;--sidebar-border: #272C3E;--sidebar-text: #D1D5E4;--sidebar-text-secondary: #6C7293;--sidebar-hover: #21263A;--sidebar-active-bg: rgba(86, 141, 229, .14);--sidebar-active: #568DE5;--text-primary: #1A1A1A;--text-secondary: #6B6B6B;--text-tertiary: #9B9B9B;--text-inverse: #FFFFFF;--accent: #3B7DD8;--accent-hover: #2B62AD;--accent-light: rgba(59, 125, 216, .07);--gold: #C5961B;--gold-light: rgba(197, 150, 27, .08);--color-concept: #3B7DD8;--color-company: #47956A;--color-person: #C5961B;--color-lecture: #C2604A;--color-transcript: #7E5FAD;--border: #DCDCDC;--border-light: #EAEAEA;--shadow-sm: 0 1px 3px rgba(0,0,0,.06);--shadow-md: 0 4px 12px rgba(0,0,0,.08);--shadow-lg: 0 8px 30px rgba(0,0,0,.12);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-pill: 20px;--sidebar-width: 250px}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{font-size:16px;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}body{font-family:-apple-system,BlinkMacSystemFont,SF Pro Text,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--body-bg);color:var(--text-primary);line-height:1.6;min-height:100vh}a{color:var(--accent);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-hover)}::-webkit-scrollbar{width:4px;height:4px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:silver;border-radius:2px}.app-layout{display:flex;min-height:100vh}.sidebar{position:fixed;top:0;left:0;width:var(--sidebar-width);height:100vh;background:var(--sidebar-bg);border-right:1px solid var(--sidebar-border);display:flex;flex-direction:column;z-index:100;overflow-y:auto}.sidebar-logo{padding:24px 20px 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var(--sidebar-border)}.sidebar-ai-btn{display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;border-radius:var(--radius-md);background:linear-gradient(135deg,#c5961b,#a87d14);color:#1a1a1a;font-weight:600;font-size:14px;border:none;cursor:pointer;transition:all .2s ease;width:100%;text-decoration:none}.sidebar-ai-btn:hover{transform:translateY(-1px);box-shadow:0 4px 12px #c5961b4d}.sidebar-ai-badge{font-size:10px;background:#568de5;color:#fff;padding:1px 6px;border-radius:4px;font-weight:700;vertical-align:middle}.main-content{margin-left:var(--sidebar-width);flex:1;min-height:100vh;background:var(--body-bg)}.hero{background:linear-gradient(135deg,#191d2b,#1e2438,#252d45);padding:48px 48px 40px;color:#fff}.hero-title{font-size:28px;font-weight:700;letter-spacing:-.02em;margin-bottom:8px}.hero-subtitle{font-size:14px;color:#fff9;margin-bottom:24px}.hero-actions{display:flex;gap:12px}.hero-btn{display:inline-flex;align-items:center;gap:8px;padding:10px 24px;border-radius:22px;font-size:14px;font-weight:500;cursor:pointer;transition:all .2s ease;text-decoration:none;border:none}.hero-btn-primary{background:var(--gold);color:#1a1a1a}.hero-btn-primary:hover{background:#b8922a;transform:translateY(-1px)}.hero-btn-secondary{background:#ffffff1a;color:#fff;border:1px solid rgba(255,255,255,.3)}.hero-btn-secondary:hover{background:#ffffff26;border-color:#ffffff80}.content-container{max-width:1200px;margin:0 auto;padding:24px 32px}.stats-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:32px}.stat-card{background:#fff;border-radius:var(--radius-md);padding:20px;box-shadow:var(--shadow-sm);cursor:pointer;transition:all .2s ease;border-top:3px solid 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