/* ============================================================
   PDF Editor — Design Tokens (variables.css)
   Base design system: colors, spacing, typography, elevation
   ============================================================ */

@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');

/* ── CSS Custom Properties for Animation ──────────────── */
@property --gradient-angle {
    syntax: '<angle>';
    initial-value: 0deg;
    inherits: false;
}
@property --glow-opacity {
    syntax: '<number>';
    initial-value: 0;
    inherits: false;
}
@property --border-progress {
    syntax: '<percentage>';
    initial-value: 0%;
    inherits: false;
}

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

    --text-xs: 0.75rem;
    --text-sm: 0.875rem;
    --text-base: 1rem;
    --text-lg: 1.125rem;
    --text-xl: 1.25rem;
    --text-2xl: 1.5rem;
    --text-3xl: 1.875rem;
    --text-4xl: 2.25rem;
    --text-5xl: 3rem;
    --text-6xl: 3.75rem;

    --weight-light: 300;
    --weight-normal: 400;
    --weight-medium: 500;
    --weight-semibold: 600;
    --weight-bold: 700;
    --weight-extrabold: 800;

    --leading-tight: 1.15;
    --leading-snug: 1.3;
    --leading-normal: 1.5;
    --leading-relaxed: 1.65;

    /* ── Spacing Scale ───────────────────────────────── */
    --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;

    /* ── Border Radius ───────────────────────────────── */
    --radius-sm: 0.375rem;
    --radius-md: 0.625rem;
    --radius-lg: 1rem;
    --radius-xl: 1.25rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;

    /* ── Z-Index Scale ───────────────────────────────── */
    --z-base: 0;
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-overlay: 300;
    --z-modal: 400;
    --z-toast: 500;
    --z-tooltip: 600;

    /* ── Transitions ─────────────────────────────────── */
    --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
    --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
    --ease-in-out-quart: cubic-bezier(0.76, 0, 0.24, 1);
    --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);

    --duration-fast: 150ms;
    --duration-normal: 250ms;
    --duration-slow: 400ms;
    --duration-slower: 600ms;

    /* ── Container Widths ────────────────────────────── */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1200px;
    --container-2xl: 1400px;

    /* ── Shadows ──────────────────────────────────────── */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.15), 0 8px 10px -6px rgba(0,0,0,0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.25);

    /* ── Tool Category Colors (stable across themes) ── */
    --cat-organize: #f59e0b;
    --cat-organize-bg: rgba(245, 158, 11, 0.12);
    --cat-convert: #6366f1;
    --cat-convert-bg: rgba(99, 102, 241, 0.12);
    --cat-edit: #8b5cf6;
    --cat-edit-bg: rgba(139, 92, 246, 0.12);
    --cat-optimize: #10b981;
    --cat-optimize-bg: rgba(16, 185, 129, 0.12);
    --cat-security: #ef4444;
    --cat-security-bg: rgba(239, 68, 68, 0.12);
    --cat-scan: #0ea5e9;
    --cat-scan-bg: rgba(14, 165, 233, 0.12);

    /* ── Default Theme: Midnight Indigo ───────────────── */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a27;
    --bg-elevated: #1e1e2e;

    --glass-bg: rgba(255, 255, 255, 0.035);
    --glass-bg-hover: rgba(255, 255, 255, 0.06);
    --glass-border: rgba(255, 255, 255, 0.07);
    --glass-border-hover: rgba(255, 255, 255, 0.14);
    --glass-blur: 20px;
    --glass-saturate: 180%;

    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-tertiary: #a78bfa;
    --accent-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 50%, #a78bfa 100%);
    --accent-glow: rgba(99, 102, 241, 0.35);
    --accent-soft: rgba(99, 102, 241, 0.1);

    --text-primary: #f0f0f5;
    --text-secondary: #9ca3af;
    --text-tertiary: #6b7280;
    --text-inverse: #0a0a0f;

    --success: #10b981;
    --success-bg: rgba(16, 185, 129, 0.12);
    --warning: #f59e0b;
    --warning-bg: rgba(245, 158, 11, 0.12);
    --danger: #ef4444;
    --danger-bg: rgba(239, 68, 68, 0.12);
    --info: #0ea5e9;
    --info-bg: rgba(14, 165, 233, 0.12);

    --divider: rgba(255, 255, 255, 0.06);
    --scrollbar-track: rgba(255, 255, 255, 0.02);
    --scrollbar-thumb: rgba(255, 255, 255, 0.08);

    /* ── Theme meta ──────────────────────────────────── */
    --theme-mode: dark;
    --noise-opacity: 0.025;
    --mesh-opacity: 0.5;
}