:root{--color-bg: #f2f4f7;--color-surface: #ffffff;--color-text: #1f2733;--color-muted: #6b7785;--color-border: #e3e8ee;--color-border-strong: #cbd4de;--color-primary: #1f6fd0;--color-primary-dark: #18589f;--color-primary-soft: #e8f2fe;--color-danger: #c0392b;--color-success: #1f7a4d;--radius-lg: 16px;--radius-md: 12px;--radius-sm: 8px;--nav-height: 58px;--content-max: 1120px}*{box-sizing:border-box}html,body{margin:0;padding:0}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,sans-serif;background:var(--color-bg);color:var(--color-text);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}button,input,select,textarea{font:inherit;color:inherit}button{cursor:pointer}a{color:var(--color-primary);text-decoration:none}.app{min-height:100vh;display:flex;flex-direction:column}.app-header{position:sticky;top:0;z-index:30;background:#fffffff5;border-bottom:1px solid 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100px);display:flex;align-items:center;justify-content:center}.login-card{width:100%;max-width:400px;display:flex;flex-direction:column;gap:18px;padding:26px 22px;background:var(--color-surface);border:1px solid var(--color-border);border-radius:var(--radius-lg);box-shadow:0 12px 40px #0f172a14}.login-brand{margin:0;font-size:24px;font-weight:700;letter-spacing:1px}.login-brand-sub{margin:0;color:var(--color-muted);font-size:13px}.login-form{display:flex;flex-direction:column;gap:14px}.form-error{margin:0;padding:9px 12px;border-radius:var(--radius-sm);background:#fdf1ef;color:var(--color-danger);font-size:13px}.image-field{display:flex;flex-direction:column;gap:8px}.image-preview{aspect-ratio:4 / 3;max-width:480px;overflow:hidden;border:1px solid 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