/**
 * Global Studies - Brand Design System
 * =====================================
 * This file contains all brand colors, typography, and reusable components.
 * To change the site-wide color scheme, update the CSS custom properties below.
 * 
 * Usage: All templates should use these CSS classes and variables for consistency.
 */

/* ==========================================================================
   CSS Custom Properties (Design Tokens)
   ========================================================================== */

:root {
    /* -------------------------------------------------------------------------
       Primary Brand Color
       Change these values to update the primary color across the entire site
       ------------------------------------------------------------------------- */
    --color-primary: #2563eb;           /* Main brand color (blue-600) */
    --color-primary-hover: #1d4ed8;     /* Hover state (blue-700) */
    --color-primary-light: #3b82f6;     /* Light variant (blue-500) */
    --color-primary-dark: #1e40af;      /* Dark variant (blue-800) */
    --color-primary-50: #eff6ff;        /* Lightest tint */
    --color-primary-100: #dbeafe;       /* Very light tint */
    
    /* -------------------------------------------------------------------------
       Secondary Brand Color (Purple accents)
       ------------------------------------------------------------------------- */
    --color-secondary: #9333ea;         /* Secondary color (purple-600) */
    --color-secondary-hover: #7c3aed;   /* Hover state (purple-700) */
    --color-secondary-light: #a855f7;   /* Light variant (purple-500) */
    --color-secondary-dark: #6b21a8;    /* Dark variant (purple-800) */
    
    /* -------------------------------------------------------------------------
       Accent Color (Success/Highlight)
       ------------------------------------------------------------------------- */
    --color-accent: #10b981;            /* Accent color (emerald-500) */
    --color-accent-hover: #059669;      /* Hover state (emerald-600) */
    
    /* -------------------------------------------------------------------------
       Neutral Colors
       ------------------------------------------------------------------------- */
    --color-text-primary: #111827;      /* Main text (gray-900) */
    --color-text-secondary: #4b5563;    /* Secondary text (gray-600) */
    --color-text-muted: #9ca3af;        /* Muted text (gray-400) */
    --color-background: #ffffff;        /* Main background */
    --color-surface: #f9fafb;           /* Surface/card background (gray-50) */
    --color-border: #e5e7eb;            /* Border color (gray-200) */
    
    /* -------------------------------------------------------------------------
       Button Tokens
       ------------------------------------------------------------------------- */
    --btn-primary-bg: var(--color-primary);
    --btn-primary-hover: var(--color-primary-hover);
    --btn-primary-text: #ffffff;
    --btn-primary-shadow: rgba(37, 99, 235, 0.35);
    
    --btn-secondary-bg: var(--color-secondary);
    --btn-secondary-hover: var(--color-secondary-hover);
    --btn-secondary-text: #ffffff;
    
    /* -------------------------------------------------------------------------
       Spacing & Sizing
       ------------------------------------------------------------------------- */
    --border-radius-sm: 0.375rem;       /* 6px */
    --border-radius-md: 0.5rem;         /* 8px */
    --border-radius-lg: 0.75rem;        /* 12px */
    --border-radius-xl: 1rem;           /* 16px */
    
    /* -------------------------------------------------------------------------
       Transitions
       ------------------------------------------------------------------------- */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ==========================================================================
   Button Components
   ========================================================================== */

/**
 * Primary Button
 * Use: Main call-to-action buttons
 * Example: <a href="#" class="btn-primary">Click me</a>
 */
.btn-primary {
    background-color: var(--btn-primary-bg);
    color: var(--btn-primary-text);
    box-shadow: 0 10px 15px -3px var(--btn-primary-shadow), 
                0 4px 6px -4px var(--btn-primary-shadow);
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
}

.btn-primary:hover {
    background-color: var(--btn-primary-hover);
    transform: scale(1.05);
    color: var(--btn-primary-text);
}

.btn-primary:focus {
    outline: 2px solid var(--color-primary-light);
    outline-offset: 2px;
}

.btn-primary:active {
    transform: scale(0.98);
}

/**
 * Secondary Button
 * Use: Secondary actions, less prominent CTAs
 */
.btn-secondary {
    background-color: var(--btn-secondary-bg);
    color: var(--btn-secondary-text);
    box-shadow: 0 4px 6px -1px rgba(147, 51, 234, 0.25);
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
}

.btn-secondary:hover {
    background-color: var(--btn-secondary-hover);
    transform: scale(1.05);
    color: var(--btn-secondary-text);
}

/**
 * Outline Button
 * Use: Tertiary actions, ghost buttons
 */
.btn-outline {
    background-color: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
    transition: all var(--transition-normal);
    cursor: pointer;
    text-decoration: none;
}

.btn-outline:hover {
    background-color: var(--color-primary);
    color: #ffffff;
    transform: scale(1.05);
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

/* Text colors using brand palette */
.text-primary { color: var(--color-primary) !important; }
.text-secondary { color: var(--color-secondary) !important; }
.text-accent { color: var(--color-accent) !important; }

/* Background colors using brand palette */
.bg-primary { background-color: var(--color-primary) !important; }
.bg-secondary { background-color: var(--color-secondary) !important; }
.bg-accent { background-color: var(--color-accent) !important; }

/* ==========================================================================
   Responsive Adjustments
   ========================================================================== */

@media (max-width: 640px) {
    .btn-primary,
    .btn-secondary,
    .btn-outline {
        padding: 0.75rem 1.5rem;
        font-size: 0.9375rem;
    }
}

/* ==========================================================================
   Reduced Motion Support
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
    .btn-primary,
    .btn-secondary,
    .btn-outline {
        transition: none;
    }
    
    .btn-primary:hover,
    .btn-secondary:hover,
    .btn-outline:hover {
        transform: none;
    }
}

/* ==========================================================================
   Global Studies — Premium Design System (site-wide)
   ========================================================================== */

:root {
    --gs-ink: #0a2540;
    --gs-ink-2: #14365c;
    --gs-ink-3: #1f4d7a;
    --gs-canvas: #fafaf7;
    --gs-surface: #ffffff;
    --gs-muted: #6b7280;
    --gs-subtle: #9aa3b2;
    --gs-border: #ebe8de;
    --gs-border-strong: #d8d3c2;
    --gs-accent: #b8945a;
    --gs-accent-2: #d4b078;
    --gs-accent-soft: #f5efe1;
}

body {
    background: var(--gs-canvas);
    color: var(--gs-ink);
    font-family: 'Inter', system-ui, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

.gs-container {
    max-width: 1240px;
    margin-left: auto;
    margin-right: auto;
    padding-left: 1.5rem;
    padding-right: 1.5rem;
}
@media (min-width: 1024px) {
    .gs-container { padding-left: 2.5rem; padding-right: 2.5rem; }
}
@media (max-width: 640px) {
    .gs-container { padding-left: 1rem; padding-right: 1rem; }
}

.gs-display {
    font-family: 'Inter', system-ui, sans-serif;
    letter-spacing: -0.04em;
    line-height: 0.98;
    font-weight: 600;
}
.gs-eyebrow {
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    font-weight: 600;
    color: var(--gs-ink-3);
}
.gs-serif { font-family: 'Roboto Slab', serif; }
.gs-section { padding-top: 6rem; padding-bottom: 6rem; }
@media (max-width: 768px) { .gs-section { padding-top: 4rem; padding-bottom: 4rem; } }
.gs-divider { height: 1px; background: var(--gs-border); }

/* Buttons (premium) */
.gs-btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 0.5rem;
    padding: 0.875rem 1.5rem;
    font-size: 0.9375rem; font-weight: 500;
    border-radius: 9999px;
    transition: transform .25s ease, background .25s ease, color .25s ease, box-shadow .25s ease, border-color .25s ease;
    will-change: transform;
    text-decoration: none;
    cursor: pointer;
}
.gs-btn-primary {
    background: var(--gs-ink); color: #fff;
    box-shadow: 0 1px 0 rgba(255,255,255,0.04) inset, 0 8px 24px -10px rgba(10, 37, 64, 0.45);
}
.gs-btn-primary:hover { background: #0d2d4f; transform: translateY(-1px); color: #fff; }
.gs-btn-ghost {
    background: transparent; color: var(--gs-ink);
    border: 1px solid var(--gs-border-strong);
}
.gs-btn-ghost:hover { border-color: var(--gs-ink); background: #fff; }
.gs-btn-light {
    background: rgba(255,255,255,0.08); color: #fff;
    border: 1px solid rgba(255,255,255,0.18);
    backdrop-filter: blur(10px);
}
.gs-btn-light:hover { background: rgba(255,255,255,0.16); color: #fff; }
.gs-btn-sm { padding: 0.55rem 1rem; font-size: 0.8125rem; }

/* Chip */
.gs-chip {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 0.4rem 0.85rem;
    border: 1px solid var(--gs-border-strong);
    border-radius: 9999px;
    font-size: 0.78rem; letter-spacing: 0.04em;
    color: var(--gs-ink-2); background: #fff;
}
.gs-chip .dot { width: 6px; height: 6px; border-radius: 9999px; background: var(--gs-accent); }

/* Card */
.gs-card {
    background: #fff;
    border: 1px solid var(--gs-border);
    border-radius: 20px;
    overflow: hidden;
    transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.gs-card:hover {
    transform: translateY(-4px);
    border-color: var(--gs-border-strong);
    box-shadow: 0 24px 48px -28px rgba(10, 37, 64, 0.18);
}

/* Animations */
@keyframes gsRise { from { opacity: 0; transform: translateY(14px); } to { opacity: 1; transform: translateY(0); } }
.gs-rise { animation: gsRise .8s cubic-bezier(.22,.61,.36,1) both; }
.gs-rise-2 { animation-delay: .08s; }
.gs-rise-3 { animation-delay: .16s; }
.gs-rise-4 { animation-delay: .24s; }

/* Link with arrow */
.gs-link {
    display: inline-flex; align-items: center; gap: 0.4rem;
    color: var(--gs-ink); font-weight: 500;
    border-bottom: 1px solid transparent;
    transition: gap .2s ease, border-color .2s ease;
    text-decoration: none;
}
.gs-link:hover { gap: 0.65rem; border-color: var(--gs-ink); color: var(--gs-ink); }

.gs-accent { color: var(--gs-accent); }

@media (prefers-reduced-motion: reduce) {
    .gs-rise, .gs-card, .gs-btn { animation: none !important; transition: none !important; }
}

section { scroll-margin-top: 80px; }