:root{--bg-primary: #f8f9fa;--bg-secondary: #ffffff;--bg-card: #ffffff;--text-primary: #1a1a2e;--text-secondary: #4a4a68;--text-muted: #6c757d;--accent: #0066cc;--accent-hover: #0052a3;--border: #e9ecef;--header-bg: #1a1a2e;--header-text: #ffffff;--success: #28a745;--warning: #ffc107;--danger: #dc3545}[data-theme=dark]{--bg-primary: #1a1a2e;--bg-secondary: #16213e;--bg-card: #1f2940;--text-primary: #e4e6eb;--text-secondary: #b0b3b8;--text-muted: #8a8d91;--accent: #4dabf7;--accent-hover: #74c0fc;--border: #2d3748;--header-bg: #0f0f1a}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;font-size:16px;line-height:1.6;color:var(--text-primary);background:var(--bg-primary);transition:background .3s ease,color .3s ease}a{color:var(--accent);text-decoration:none;transition:color .2s ease}a:hover{color:var(--accent-hover)}.site-header{background:var(--header-bg);padding:0 20px;position:sticky;top:0;z-index:100;box-shadow:0 2px 4px #0000001a}.header-container{max-width:1200px;margin:0 auto;display:flex;justify-content:space-between;align-items:center;height:60px}.site-logo{font-size:1.25rem;font-weight:700;color:var(--header-text);text-decoration:none}.site-logo:hover{color:var(--header-text);opacity:.9}.header-nav{display:flex;align-items:center;gap:24px}.header-nav a{color:var(--header-text);opacity:.85;font-size:.95rem;transition:opacity .2s ease}.header-nav a:hover,.header-nav a.active{opacity:1}.nav-divider{width:1px;height:20px;background:#fff3}.theme-toggle{background:none;border:none;color:var(--header-text);cursor:pointer;padding:8px;opacity:.85;font-size:1.1rem}.theme-toggle:hover{opacity:1}.main-content{max-width:900px;margin:0 auto;padding:30px 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var(--border);box-shadow:0 4px 12px #00000014}.login-form h2{text-align:center;margin-bottom:8px;font-size:1.5rem}.login-form p{text-align:center;color:var(--text-muted);margin-bottom:24px}.loading{text-align:center;padding:40px;color:var(--text-muted)}.error{text-align:center;padding:20px;color:var(--danger);background:#dc35451a;border-radius:8px}.site-footer{text-align:center;padding:24px;color:var(--text-muted);font-size:.85rem;border-top:1px solid var(--border);margin-top:40px}.site-footer a{color:var(--text-secondary)}@media(max-width:640px){.header-nav{gap:16px}.header-nav a{font-size:.85rem}.tenant-tabs{flex-wrap:wrap}.page-title{font-size:1.5rem}}