/* ═══════════════════════════════════════════════════════
   bi-app.net — Design System Variables
   Dark/Light Theme Engine
   ═══════════════════════════════════════════════════════ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&family=JetBrains+Mono:wght@400;500;600&display=swap');

:root {
    /* ── Typography ── */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

    /* ── Brand Colors ── */
    --brand-navy: #1a237e;
    --brand-navy-light: #283593;
    --brand-turquoise: #00bcd4;
    --brand-turquoise-light: #26c6da;
    --brand-turquoise-dark: #0097a7;
    --brand-accent: #00e5ff;
    --brand-gold: #ffd740;
    --brand-success: #00e676;
    --brand-warning: #ffab40;
    --brand-error: #ff5252;

    /* ── Spacing ── */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;

    /* ── Border Radius ── */
    --radius-sm: 6px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* ── Shadows ── */
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.12);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.15);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.18);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.2);
    --shadow-glow: 0 0 20px rgba(0,188,212,0.3);

    /* ── Transitions ── */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 400ms ease;
    --transition-spring: 350ms cubic-bezier(0.34, 1.56, 0.64, 1);

    /* ── Z-Index ── */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-modal-backdrop: 300;
    --z-modal: 400;
    --z-toast: 500;

    /* ── Container ── */
    --container-max: 1200px;
    --container-narrow: 800px;
}

/* ═══════════════════════════════════════════════════════
   DARK THEME (default)
   ═══════════════════════════════════════════════════════ */
[data-theme="dark"], :root {
    --bg-primary: #0a0e1a;
    --bg-secondary: #111827;
    --bg-tertiary: #1a2035;
    --bg-card: rgba(26, 32, 53, 0.8);
    --bg-card-hover: rgba(30, 40, 65, 0.9);
    --bg-code: #151c2c;
    --bg-input: rgba(26, 32, 53, 0.6);
    --bg-nav: rgba(10, 14, 26, 0.85);
    --bg-modal: rgba(17, 24, 39, 0.98);

    --text-primary: #f0f4ff;
    --text-secondary: #94a3b8;
    --text-tertiary: #64748b;
    --text-inverse: #0a0e1a;
    --text-link: var(--brand-turquoise-light);

    --border-primary: rgba(148, 163, 184, 0.12);
    --border-secondary: rgba(148, 163, 184, 0.06);
    --border-accent: rgba(0, 188, 212, 0.3);

    --glass-bg: rgba(26, 32, 53, 0.6);
    --glass-border: rgba(148, 163, 184, 0.1);
    --glass-blur: blur(20px);

    --gradient-hero: linear-gradient(135deg, #0a0e1a 0%, #1a237e 50%, #0a0e1a 100%);
    --gradient-card: linear-gradient(145deg, rgba(26,35,126,0.15), rgba(0,188,212,0.05));
    --gradient-accent: linear-gradient(135deg, var(--brand-turquoise), var(--brand-navy));
    --gradient-cta: linear-gradient(135deg, #00bcd4, #1a237e);

    --scrollbar-track: #111827;
    --scrollbar-thumb: #2d3748;
}

/* ═══════════════════════════════════════════════════════
   LIGHT THEME
   ═══════════════════════════════════════════════════════ */
[data-theme="light"] {
    --bg-primary: #f8fafc;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f1f5f9;
    --bg-card: rgba(255, 255, 255, 0.9);
    --bg-card-hover: rgba(249, 250, 251, 1);
    --bg-code: #f1f5f9;
    --bg-input: rgba(241, 245, 249, 0.8);
    --bg-nav: rgba(248, 250, 252, 0.9);
    --bg-modal: rgba(255, 255, 255, 0.98);

    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-tertiary: #94a3b8;
    --text-inverse: #f8fafc;
    --text-link: var(--brand-turquoise-dark);

    --border-primary: rgba(15, 23, 42, 0.1);
    --border-secondary: rgba(15, 23, 42, 0.05);
    --border-accent: rgba(0, 188, 212, 0.3);

    --glass-bg: rgba(255, 255, 255, 0.7);
    --glass-border: rgba(15, 23, 42, 0.08);
    --glass-blur: blur(20px);

    --gradient-hero: linear-gradient(135deg, #e8eaf6 0%, #bbdefb 50%, #e0f7fa 100%);
    --gradient-card: linear-gradient(145deg, rgba(26,35,126,0.05), rgba(0,188,212,0.03));
    --gradient-accent: linear-gradient(135deg, var(--brand-turquoise), var(--brand-navy));
    --gradient-cta: linear-gradient(135deg, #0097a7, #283593);

    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.1);
    --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
    --shadow-glow: 0 0 20px rgba(0,188,212,0.2);

    --scrollbar-track: #f1f5f9;
    --scrollbar-thumb: #cbd5e1;
}