/* ============================================================
   Arch 2.0 — Design Tokens (Light theme defaults)
   ============================================================ */

:root {
    /* Brand */
    --brand: #059669;
    --brand-hover: #10B981;
    --brand-active: #047857;
    --brand-subtle: rgba(5, 150, 105, .06);
    --brand-muted: rgba(5, 150, 105, .12);
    --brand-text: #FFFFFF;

    /* Backgrounds */
    --bg-app: #F5F6F8;
    --bg-surface: #FFFFFF;
    --bg-surface-alt: #F0F1F3;
    --bg-surface-hover: #F0F1F3;
    --bg-elevated: #FFFFFF;
    --bg-sidebar: #FFFFFF;
    --bg-topnav: rgba(255, 255, 255, .82);
    --bg-input: #FFFFFF;

    /* Text */
    --text-primary: #1A1F36;
    --text-secondary: #374151;
    --text-tertiary: #9CA3AF;
    --text-inverse: #FFFFFF;
    --text-link: #059669;

    /* Borders */
    --border: #E5E7EB;
    --border-subtle: #F3F4F6;
    --border-strong: #D1D5DB;
    --border-focus: #34D399;

    /* Semantic */
    --success: #16A34A;
    --success-bg: #DCFCE7;
    --success-text: #166534;
    --warning: #D97706;
    --warning-bg: #FEF3C7;
    --warning-text: #92400E;
    --danger: #DC2626;
    --danger-bg: #FEE2E2;
    --danger-text: #991B1B;
    --info: #2563EB;
    --info-bg: #DBEAFE;
    --info-text: #1E40AF;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, .06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, .08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, .12);
    --card-shadow: 0 1px 3px rgba(0, 0, 0, .06), 0 4px 12px rgba(0, 0, 0, .04);

    /* Spacing (8pt grid) */
    --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-12: 3rem;
    --space-16: 4rem;

    /* Border Radius */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Typography */
    --font-heading: 'Sora', sans-serif;
    --font-body: 'IBM Plex Sans', system-ui, sans-serif;
    --font-mono: 'JetBrains Mono', monospace;

    --fs-xs: clamp(0.65rem, 0.6rem + 0.25vw, 0.75rem);
    --fs-sm: clamp(0.78rem, 0.72rem + 0.3vw, 0.875rem);
    --fs-base: clamp(0.875rem, 0.82rem + 0.3vw, 1rem);
    --fs-md: clamp(1rem, 0.93rem + 0.35vw, 1.125rem);
    --fs-lg: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
    --fs-xl: clamp(1.375rem, 1.15rem + 0.7vw, 1.75rem);
    --fs-2xl: clamp(1.625rem, 1.3rem + 1vw, 2.25rem);

    /* Layout */
    --topnav-height: 54px;
    --sidebar-width: 220px;

    /* Motion */
    --ease: cubic-bezier(.4, 0, .2, 1);
    --duration: 0.25s;
}