:root{--primary: #4f7cf5;--primary-dark: #3d68e0;--primary-soft: #eef3ff;--text: #1f2430;--text-2: #6b7280;--text-3: #98a1b3;--line: #e8ecf4;--bg: #f2f4f9;--card: #ffffff;--header-h: 56px;--sidebar-w: 214px;--ok: #14b37d;--warn: #e79b2f;--danger: #e05252}*{margin:0;padding:0;box-sizing:border-box}body{font-family:PingFang SC,Microsoft YaHei,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:14px;-webkit-font-smoothing:antialiased}button{font-family:inherit;cursor:pointer}.icon{display:inline-block;vertical-align:-2px}.page{min-height:100vh;display:flex;flex-direction:column;align-items:center;justify-content:center;padding:24px;background:linear-gradient(135deg,#eef2ff,#f6f8fc 55%,#e8f4ef)}.login-card{width:100%;max-width:400px;background:var(--card);border-radius:20px;padding:36px 32px 28px;box-shadow:0 18px 48px 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#2b56be47}.header__brand{width:var(--sidebar-w);display:flex;align-items:center;gap:10px;padding-left:16px;flex-shrink:0}.header__logo{width:28px;height:28px;border-radius:8px;background:#ffffff38;display:flex;align-items:center;justify-content:center}.header__name{font-size:15px;font-weight:600;letter-spacing:.4px;white-space:nowrap}.topnav{display:flex;align-items:center;gap:2px;flex:1;overflow:hidden}.topnav__tab{display:flex;align-items:center;gap:6px;height:34px;padding:0 13px;border:none;border-radius:8px;background:transparent;color:#ffffffd1;font-size:13.5px;white-space:nowrap;transition:background .18s,color 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