:root {
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-50: #f7f8fb;
    --color-gray-100: #edf1f6;
    --color-gray-200: #e3e8f0;
    --color-gray-300: #d2d9e5;
    --color-gray-400: #b8c2d4;
    --color-gray-500: #95a1b8;
    --color-gray-600: #73819b;
    --color-gray-700: #55637f;
    --color-gray-800: #3b4864;
    --color-gray-900: #1f2a44;
    --color-accent: #2f6fe4;
    --color-accent-hover: #295fcb;
    --color-accent-light: #e6eefc;
    --color-accent-dark: #2147a6;
    --color-success: #1b7f5f;
    --color-success-light: #d6efe6;
    --color-danger: #d64545;
    --color-danger-light: #f8dede;
    --color-warning: #e0a11b;
    --color-warning-light: #fdf1d4;
    --color-info: #1a9ccf;
    --color-info-light: #d6f0fb;
    --bg-primary: var(--color-white);
    --bg-secondary: #f3f6fb;
    --bg-tertiary: #eef2f7;
    --bg-hover: #e7edf5;
    --bg-sidebar: #111827;
    --bg-sidebar-hover: #182235;
    --bg-sidebar-active: #1f2f4a;
    --text-primary: var(--color-gray-900);
    --text-secondary: #5f6c85;
    --text-tertiary: #7b889f;
    --text-muted: #7b889f;
    --border-color: #d7deea;
    --border-hover: #c2cbdb;
    --border-light: #e4e9f1;
    --sidebar-text: #e7edf7;
    --sidebar-text-muted: #a7b2c8;
    --sidebar-border: #1e293b;
    --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.06);
    --shadow-md: 0 4px 10px rgba(16, 24, 40, 0.08);
    --shadow-lg: 0 10px 24px rgba(16, 24, 40, 0.12);
    --shadow-xl: 0 18px 40px rgba(16, 24, 40, 0.16);
    --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-family-mono: 'SF Mono', Monaco, 'Courier New', monospace;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    --spacing-0: 0;
    --spacing-1: 0.25rem;
    --spacing-2: 0.5rem;
    --spacing-3: 0.75rem;
    --spacing-4: 1rem;
    --spacing-5: 1.25rem;
    --spacing-6: 1.5rem;
    --spacing-8: 2rem;
    --spacing-10: 2.5rem;
    --spacing-12: 3rem;
    --spacing-16: 4rem;
    --radius-sm: 0.3rem;
    --radius-md: 0.45rem;
    --radius-lg: 0.6rem;
    --radius-xl: 0.8rem;
    --radius-full: 9999px;
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}
body.dark-mode {
    --bg-primary: #111827;
    --bg-secondary: #0f172a;
    --bg-tertiary: #162033;
    --bg-hover: #1b263c;
    --bg-sidebar: #0b1220;
    --bg-sidebar-hover: #121a2b;
    --bg-sidebar-active: #18243a;
    --text-primary: #e2e8f0;
    --text-secondary: #a3b0c6;
    --text-tertiary: #7f8aa3;
    --text-muted: #7f8aa3;
    --border-color: #22304a;
    --border-hover: #2b3a57;
    --border-light: #1b273d;
    --sidebar-text: #e2e8f0;
    --sidebar-text-muted: #a3b0c6;
    --sidebar-border: #162238;
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.45);
    --shadow-md: 0 4px 10px rgba(0, 0, 0, 0.55);
    --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 18px 40px rgba(0, 0, 0, 0.7);
}
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
    border-radius: var(--radius-sm);
}