:root{--bg-primary: #ffffff;--bg-secondary: #f5f5f7;--bg-card: #ffffff;--bg-hover: #f0f0f3;--border: #d2d2d7;--text-primary: #1d1d1f;--text-secondary: #6e6e73;--text-dim: #aeaeb2;--accent: #0071e3;--accent-hover: #0077ed;--green: #34c759;--yellow: #ff9f0a;--red: #ff3b30;--purple: #af52de;--teal: #5ac8fa;--pink: #ff2d55;--orange: #ff9500;--sidebar-width: 220px;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .08);--shadow-lg: 0 12px 40px rgba(0, 0, 0, .12);--radius-sm: 10px;--radius-md: 14px;--radius-lg: 20px}*{margin:0;padding:0;box-sizing:border-box}.login-screen{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(180deg,#fbfbfd,#f5f5f7)}.login-card{text-align:center;max-width:380px;width:100%;background:#fff;border-radius:20px;padding:40px 32px;box-shadow:var(--shadow-lg)}.login-logo{color:var(--accent);margin-bottom:16px}.login-card h1{font-size:24px;margin-bottom:8px;color:var(--text-primary)}.login-card 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