:root {
    color-scheme: light;

    --color-bg-main: #f5f4ef;
    --color-bg-card: #fcfbf8;
    --color-bg-elevated: rgba(252, 251, 248, 0.92);
    --color-bg-muted: #ecebe3;
    --color-bg-soft: rgba(18, 20, 24, 0.04);
    --color-bg-overlay: rgba(14, 15, 17, 0.22);

    --color-text-primary: #121418;
    --color-text-secondary: #5a6068;
    --color-text-tertiary: #8b9198;
    --color-text-inverse: #f5f7fa;

    --color-border-subtle: rgba(18, 20, 24, 0.08);
    --color-border-hover: rgba(18, 20, 24, 0.16);

    --color-accent: #171a20;
    --color-accent-hover: #242a33;
    --color-accent-text: #f5f7fa;

    --color-highlight: #2f7cf6;
    --color-success: #22c55e;
    --color-danger: #ef4444;
    --color-focus-ring: rgba(47, 124, 246, 0.32);
    --color-grid-line: rgba(18, 20, 24, 0.04);
    --color-brand-wall: #e8e7dd;
    --color-chat-assistant: #eff1f4;
    --color-placeholder-start: rgba(244, 242, 236, 0.92);
    --color-placeholder-end: rgba(252, 251, 248, 0.72);
    --color-code-bg: #121419;
    --color-code-header: #1c2128;
    --color-code-border: rgba(18, 20, 24, 0.18);
    --color-code-text: rgba(245, 247, 250, 0.82);

    --font-family-sans: "Space Grotesk", "Segoe UI", Helvetica, Arial, sans-serif;
    --font-family-mono: "IBM Plex Mono", "SFMono-Regular", Consolas, "Liberation Mono", Menlo, 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: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3.5rem;
    --font-size-6xl: 4.5rem;

    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;

    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;
    --space-32: 8rem;
    --space-40: 10rem;

    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.06);
    --shadow-glow: 0 0 0 1px rgba(0, 0, 0, 0.04), 0 8px 40px rgba(0, 0, 0, 0.06);

    --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-normal: 300ms cubic-bezier(0.16, 1, 0.3, 1);
    --transition-slow: 500ms cubic-bezier(0.16, 1, 0.3, 1);
}

body {
    font-family: var(--font-family-sans);
    background-color: var(--color-bg-main);
    color: var(--color-text-primary);
    font-size: var(--font-size-base);
    letter-spacing: -0.01em;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: var(--font-weight-semibold);
    letter-spacing: -0.03em;
    color: var(--color-text-primary);
    margin: 0;
}

h1 {
    letter-spacing: -0.04em;
}

.glass-effect {
    background: var(--color-bg-elevated);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
}

@media (prefers-color-scheme: dark) {
    :root {
        color-scheme: dark;

        --color-bg-main: #0f1216;
        --color-bg-card: #151a20;
        --color-bg-elevated: rgba(21, 26, 32, 0.92);
        --color-bg-muted: #131820;
        --color-bg-soft: rgba(241, 244, 247, 0.06);
        --color-bg-overlay: rgba(3, 6, 10, 0.58);

        --color-text-primary: #f1f4f7;
        --color-text-secondary: #b3bcc7;
        --color-text-tertiary: #8b96a3;
        --color-text-inverse: #0f1216;

        --color-border-subtle: rgba(241, 244, 247, 0.09);
        --color-border-hover: rgba(241, 244, 247, 0.16);

        --color-accent: #f1f4f7;
        --color-accent-hover: #d9e0e7;
        --color-accent-text: #101419;

        --color-highlight: #73a7ff;
        --color-focus-ring: rgba(115, 167, 255, 0.22);
        --color-grid-line: rgba(241, 244, 247, 0.05);
        --color-brand-wall: #121820;
        --color-chat-assistant: #1b2129;
        --color-placeholder-start: rgba(22, 27, 34, 0.96);
        --color-placeholder-end: rgba(18, 22, 27, 0.78);
        --color-code-bg: #0c0f13;
        --color-code-header: #121820;
        --color-code-border: rgba(241, 244, 247, 0.08);
        --color-code-text: rgba(241, 244, 247, 0.8);

        --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.24);
        --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.22);
        --shadow-lg: 0 18px 44px rgba(0, 0, 0, 0.3);
        --shadow-glow: 0 0 0 1px rgba(241, 244, 247, 0.04), 0 14px 48px rgba(0, 0, 0, 0.28);
    }
}