*{margin:0;padding:0;box-sizing:border-box}:root{--primary: #1e90ff;--primary-dark: #1c7ed6;--danger: #e74c3c;--success: #2ecc71;--warning: #f39c12;--bg: #f5f7fa;--sidebar-bg: #1a1d23;--sidebar-text: #a0a4ae;--sidebar-active: #1e90ff;--card-bg: #ffffff;--text: #2c3e50;--text-light: #7f8c8d;--border: #e1e5eb;--radius: 8px;--shadow: 0 2px 8px rgba(0, 0, 0, .08)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Noto Sans SC,sans-serif;background:var(--bg);color:var(--text);line-height:1.6}.login-container{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#1a1d23,#2c3e50)}.login-card{background:var(--card-bg);padding:40px;border-radius:12px;width:380px;box-shadow:0 10px 40px #0003}.login-header{text-align:center;margin-bottom:32px}.login-header h1{font-size:28px;color:var(--primary);margin-bottom:4px}.subtitle{color:var(--text-light);font-size:14px}.form-group{margin-bottom:20px}.form-group 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