:root{--space-xs: 4px;--space-sm: 8px;--space-md: 16px;--space-lg: 24px;--space-xl: 32px;--space-2xl: 48px;--font-body: "Inter", system-ui, sans-serif;--font-display: "Scheherazade New", serif;--font-serif: "Source Serif 4", Georgia, serif;--font-mono: "SF Mono", "Fira Code", monospace;--text-xs: 11px;--text-sm: 13px;--text-base: 15px;--text-lg: 17px;--text-xl: 20px;--text-2xl: 24px;--text-xs-fluid: clamp(11px, .3vw + 10px, 12px);--text-sm-fluid: clamp(13px, .4vw + 11px, 14px);--text-base-fluid: clamp(15px, .5vw + 13px, 18px);--text-lg-fluid: clamp(18px, .6vw + 15px, 22px);--text-xl-fluid: clamp(22px, .8vw + 18px, 28px);--text-2xl-fluid: clamp(28px, 1vw + 22px, 36px);--reading-line-height: 1.6;--reading-max-width: 65ch;--radius-sm: 4px;--radius-md: 8px;--radius-lg: 12px;--radius-full: 999px;--transition-fast: .1s ease;--transition-base: .15s ease;--transition-slow: .3s ease;--container-sm: 480px;--container-md: 640px;--container-lg: 960px;--container-xl: 1200px}[data-theme=light]{--bg: #f7f6f3;--surface: #ffffff;--panel: #efede8;--text-primary: #1c1b1f;--text-secondary: #4a4750;--text-muted: #6a6670;--accent: #6d4cff;--accent-strong: #5a3df0;--border: #e3dde9;--shadow: rgba(20, 16, 30, .08);--nav-bg: rgba(247, 246, 243, .9);--nav-border: rgba(28, 27, 31, .08);--nav-dropdown-bg: #ffffff;--nav-dropdown-border: #e3dde9;--nav-dropdown-hover: #efede8;--primary-color: #6d4cff;--primary-gradient: linear-gradient(45deg, #6d4cff, #8f7bff);--bg-primary: var(--bg);--bg-secondary: var(--surface);--bg-tertiary: var(--panel);--accent-hover: var(--accent-strong);--danger: #dc2626;--danger-rgb: 220, 38, 38;--success: #16a34a;--success-rgb: 22, 163, 74;--warning: #d97706;--warning-rgb: 217, 119, 6}[data-theme=dark]{--bg: #0f1014;--surface: #171a24;--panel: #1e2230;--text-primary: #f3f1ff;--text-secondary: #c6c0d6;--text-muted: #9b96b0;--accent: #9b7bff;--accent-strong: #b39bff;--border: #2b2f43;--shadow: rgba(0, 0, 0, .4);--nav-bg: rgba(15, 16, 20, .88);--nav-border: rgba(255, 255, 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96px}.pi-hero{display:flex;flex-direction:column;gap:20px;margin-bottom:56px}.pi-eyebrow{font-size:12px;text-transform:uppercase;letter-spacing:.24em;color:var(--text-muted);-webkit-user-select:none;user-select:none}.pi-hero h1{font-family:Scheherazade New,serif;font-size:clamp(32px,5vw,46px);font-weight:700;line-height:1.1;-webkit-user-select:none;user-select:none}.pi-subtitle{font-size:17px;color:var(--text-secondary);max-width:720px;line-height:1.6}.mode-selector{display:flex;flex-wrap:wrap;gap:10px;margin-top:8px}.mode-btn{padding:10px 24px;border-radius:999px;border:1px solid var(--border);background:var(--surface);color:var(--text-secondary);font-size:14px;font-weight:600;font-family:Inter,Arial,sans-serif;cursor:pointer;transition:all .2s ease;-webkit-user-select:none;user-select:none}.mode-btn:hover{border-color:var(--accent);color:var(--text-primary)}.mode-btn.active{background:var(--accent);color:#fff;border-color:transparent}.mode-panel{display:none}.mode-panel.active{display:block}.pi-section{margin-bottom:48px}.pi-section h2{font-family:Scheherazade New,serif;font-size:clamp(24px,4vw,32px);font-weight:700;margin-bottom:16px;line-height:1.2}.pi-section h3{font-size:18px;font-weight:600;margin-bottom:10px;color:var(--text-primary)}.pi-section p{font-size:15px;color:var(--text-secondary);line-height:1.7;margin-bottom:12px}.feature-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:16px;margin-top:20px}.feature-card{padding:20px;background:var(--surface);border-radius:12px;border:1px solid var(--border);transition:border-color .2s ease}.feature-card:hover{border-color:var(--accent)}.feature-card h4{font-size:15px;font-weight:600;margin-bottom:8px;color:var(--text-primary)}.feature-card p{font-size:13px;color:var(--text-muted);line-height:1.6;margin-bottom:0}.bazi-compare{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin:24px 0}.bazi-col{display:flex;flex-direction:column;flex:1;gap:12px}.bazi-row--heading{text-align:center;font-weight:600;padding:12px}.bazi-col-header{font-size:13px;font-weight:700;text-transform:uppercase;letter-spacing:.1em;color:var(--text-muted);padding-bottom:8px;border-bottom:1px solid var(--border);-webkit-user-select:none;user-select:none}.bazi-row{padding:14px 16px;background:var(--surface);border-radius:8px;border:1px solid var(--border)}.bazi-row strong{display:block;font-size:13px;font-weight:600;margin-bottom:4px;color:var(--text-primary)}.bazi-row span{font-size:13px;color:var(--text-secondary);line-height:1.5}.usage-list{display:flex;flex-direction:column;gap:8px;margin-top:16px}.usage-item{display:flex;align-items:flex-start;gap:10px;padding:12px 14px;background:var(--surface);border-radius:8px;border:1px solid var(--border);font-size:14px;color:var(--text-secondary);line-height:1.5}.usage-icon{flex-shrink:0;font-size:16px;line-height:1.4}.pi-cta{display:flex;flex-direction:column;align-items:center;gap:16px;margin-top:56px;padding-top:40px;border-top:1px solid var(--border);text-align:center}.pi-cta p{font-size:15px;color:var(--text-muted)}.pi-cta-btn{display:inline-flex;align-items:center;gap:8px;padding:14px 32px;background:var(--accent);color:#fff;border-radius:999px;text-decoration:none;font-size:15px;font-weight:600;font-family:Inter,Arial,sans-serif;transition:transform .2s ease,box-shadow .2s ease}.pi-cta-btn:hover{transform:translateY(-1px);box-shadow:0 8px 24px #0003}.placeholder-panel{display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:300px;text-align:center;gap:12px;padding:48px 24px;background:var(--surface);border-radius:12px;border:1px solid var(--border);margin-top:32px}.placeholder-panel .placeholder-icon{font-size:36px;opacity:.6}.placeholder-panel h3{font-size:18px;font-weight:600;color:var(--text-primary);margin-bottom:0}.placeholder-panel p{font-size:14px;color:var(--text-muted);max-width:400px}[data-lang=cn] .pi-hero h1,[data-lang=cn] .pi-section h2{font-family:"Noto Serif SC",STSong,serif}@media(max-width:768px){.platform-intro{padding:40px 16px 64px}.bazi-compare,.feature-grid{grid-template-columns:1fr}.mode-selector{gap:8px}.mode-btn{padding:8px 18px;font-size:13px}}@media(max-width:480px){.pi-hero h1{font-size:28px}.pi-section h2{font-size:22px}}