/* ===========================
   GREENFIELD R&D - BRAND SYSTEM
   Design Tokens & Foundation
   =========================== */

/* ===========================
   BRAND TOKENS
   =========================== */

:root {
    /* ========== COLORS ========== */
    
    /* Primary - Graphite & Ink (Authority) */
    --brand-graphite: #2a2a2a;
    --brand-ink: #1a1a1a;
    --brand-ink-light: #3a3a3a;
    /* Matches mark.png / logo-dark.png baked-in background */
    --brand-hero-bg: #131313;
    
    /* Surface - Parchment & Off-White (Calm) */
    --brand-parchment: #f5f5f0;
    --brand-parchment-dark: #e8e8e0;
    --brand-surface-white: #ffffff;
    --brand-surface-light: #fafaf8;
    
    /* Accent - Olive Green (Heritage brand) */
    --brand-sage: #5c6b2e;
    --brand-sage-dark: #4a5624;
    --brand-sage-light: #6d7f38;
    --brand-sage-subtle: #eef0e4;
    --brand-olive: #5a6b2e;
    --brand-olive-dark: #3d4a1f;
    --brand-gold: #c4a35a;
    --brand-cream: #f4f0e8;
    
    /* Neutrals - Grays (Hierarchy) */
    --brand-gray-900: #2a2a2a;
    --brand-gray-800: #3a3a3a;
    --brand-gray-700: #4a4a4a;
    --brand-gray-600: #5a5a5a;
    --brand-gray-500: #737373;
    --brand-gray-400: #9a9a9a;
    --brand-gray-300: #c0c0c0;
    --brand-gray-200: #e0e0e0;
    --brand-gray-100: #e8e8e8;
    --brand-gray-50: #f5f5f5;
    
    /* Semantic Colors */
    --brand-text-primary: var(--brand-graphite);
    --brand-text-secondary: var(--brand-gray-700);
    --brand-text-tertiary: var(--brand-gray-500);
    --brand-text-inverse: var(--brand-surface-white);
    
    --brand-bg-primary: var(--brand-surface-white);
    --brand-bg-secondary: var(--brand-parchment);
    --brand-bg-tertiary: var(--brand-parchment-dark);
    --brand-bg-dark: var(--brand-graphite);
    --brand-bg-darker: var(--brand-ink);
    
    --brand-border-light: var(--brand-gray-100);
    --brand-border-medium: var(--brand-gray-200);
    --brand-border-dark: var(--brand-gray-300);
    
    --brand-accent-primary: var(--brand-sage);
    --brand-accent-hover: var(--brand-sage-dark);
    --brand-accent-subtle: var(--brand-sage-subtle);
    
    /* ========== TYPOGRAPHY ========== */
    
    /* Font Families */
    --brand-font-display: 'Cormorant Garamond', 'Georgia', serif;
    --brand-font-serif: 'Cormorant Garamond', 'Georgia', 'Times New Roman', serif;
    --brand-font-sans: 'DM Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --brand-font-mono: 'IBM Plex Mono', 'SF Mono', 'Consolas', monospace;
    
    /* Font Sizes */
    --brand-text-xs: 0.8125rem;      /* 13px */
    --brand-text-sm: 0.875rem;       /* 14px */
    --brand-text-base: 1rem;         /* 16px */
    --brand-text-md: 1.125rem;       /* 18px */
    --brand-text-lg: 1.25rem;        /* 20px */
    --brand-text-xl: 1.5rem;         /* 24px */
    --brand-text-2xl: 1.875rem;      /* 30px */
    --brand-text-3xl: 2.25rem;       /* 36px */
    --brand-text-4xl: 3rem;          /* 48px */
    --brand-text-5xl: 3.75rem;       /* 60px */
    
    /* Font Weights */
    --brand-weight-light: 300;
    --brand-weight-normal: 400;
    --brand-weight-medium: 500;
    --brand-weight-semibold: 600;
    
    /* Line Heights */
    --brand-leading-tight: 1.25;
    --brand-leading-snug: 1.375;
    --brand-leading-normal: 1.5;
    --brand-leading-relaxed: 1.625;
    --brand-leading-loose: 1.75;
    
    /* Letter Spacing */
    --brand-tracking-tighter: -0.02em;
    --brand-tracking-tight: -0.01em;
    --brand-tracking-normal: 0;
    --brand-tracking-wide: 0.02em;
    --brand-tracking-wider: 0.05em;
    --brand-tracking-widest: 0.1em;
    
    /* ========== SPACING ========== */
    
    --brand-space-1: 0.25rem;    /* 4px */
    --brand-space-2: 0.5rem;     /* 8px */
    --brand-space-3: 0.75rem;    /* 12px */
    --brand-space-4: 1rem;       /* 16px */
    --brand-space-5: 1.25rem;    /* 20px */
    --brand-space-6: 1.5rem;     /* 24px */
    --brand-space-8: 2rem;       /* 32px */
    --brand-space-10: 2.5rem;    /* 40px */
    --brand-space-12: 3rem;      /* 48px */
    --brand-space-16: 4rem;      /* 64px */
    --brand-space-20: 5rem;      /* 80px */
    --brand-space-24: 6rem;      /* 96px */
    --brand-space-32: 8rem;      /* 128px */
    
    /* ========== LAYOUT ========== */
    
    --brand-container-xs: 640px;
    --brand-container-sm: 768px;
    --brand-container-md: 1024px;
    --brand-container-lg: 1200px;
    --brand-container-xl: 1400px;
    
    --brand-container-narrow: 800px;
    --brand-container-default: 1200px;
    
    /* ========== BORDERS ========== */
    
    --brand-radius-none: 0;
    --brand-radius-sm: 2px;
    --brand-radius-md: 4px;
    --brand-radius-lg: 6px;
    --brand-radius-xl: 8px;
    
    --brand-border-width: 1px;
    --brand-border-width-thick: 2px;
    --brand-border-width-heavy: 4px;
    
    /* ========== SHADOWS ========== */
    
    --brand-shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.04);
    --brand-shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.06);
    --brand-shadow-md: 0 4px 8px rgba(0, 0, 0, 0.08);
    --brand-shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.1);
    --brand-shadow-xl: 0 16px 32px rgba(0, 0, 0, 0.12);
    
    --brand-shadow-subtle: 0 1px 3px rgba(42, 42, 42, 0.06);
    
    /* ========== TRANSITIONS ========== */
    
    --brand-transition-fast: 150ms ease;
    --brand-transition-base: 200ms ease;
    --brand-transition-slow: 300ms ease;
    
    --brand-ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
    --brand-ease-out: cubic-bezier(0, 0, 0.2, 1);
    --brand-ease-in: cubic-bezier(0.4, 0, 1, 1);
    
    /* ========== Z-INDEX ========== */
    
    --brand-z-base: 0;
    --brand-z-dropdown: 1000;
    --brand-z-sticky: 1100;
    --brand-z-fixed: 1200;
    --brand-z-modal: 1300;
    --brand-z-popover: 1400;
    --brand-z-tooltip: 1500;
}

/* ===========================
   TYPOGRAPHY FOUNDATION
   =========================== */

/* Base Typography */
html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    text-rendering: optimizeLegibility;
}

body {
    font-family: var(--brand-font-sans);
    font-size: var(--brand-text-md);
    font-weight: var(--brand-weight-normal);
    line-height: var(--brand-leading-loose);
    color: var(--brand-text-primary);
    background-color: var(--brand-bg-primary);
}

/* Heading Foundation - Serif for Authority */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--brand-font-serif);
    font-weight: var(--brand-weight-normal);
    line-height: var(--brand-leading-tight);
    color: var(--brand-text-primary);
    margin: 0;
    letter-spacing: var(--brand-tracking-tight);
}

h1 {
    font-size: var(--brand-text-4xl);
    font-weight: var(--brand-weight-light);
}

h2 {
    font-size: var(--brand-text-3xl);
    font-weight: var(--brand-weight-light);
}

h3 {
    font-size: var(--brand-text-xl);
    font-weight: var(--brand-weight-normal);
}

h4 {
    font-size: var(--brand-text-lg);
    font-weight: var(--brand-weight-medium);
}

h5, h6 {
    font-size: var(--brand-text-base);
    font-weight: var(--brand-weight-medium);
}

/* Paragraph Foundation */
p {
    margin: 0 0 var(--brand-space-4);
    line-height: var(--brand-leading-relaxed);
}

p:last-child {
    margin-bottom: 0;
}

/* Link Foundation */
a {
    color: var(--brand-accent-primary);
    text-decoration: none;
    transition: color var(--brand-transition-base);
}

a:hover {
    color: var(--brand-accent-hover);
}

a:focus-visible {
    outline: 2px solid var(--brand-accent-primary);
    outline-offset: 2px;
    border-radius: var(--brand-radius-sm);
}

/* List Foundation */
ul, ol {
    margin: 0;
    padding: 0;
    list-style-position: inside;
}

/* Strong & Emphasis */
strong, b {
    font-weight: var(--brand-weight-semibold);
    color: var(--brand-text-primary);
}

em, i {
    font-style: italic;
}

/* ===========================
   LAYOUT FOUNDATION
   =========================== */

/* Container */
.container {
    width: 100%;
    max-width: var(--brand-container-default);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--brand-space-8);
    padding-right: var(--brand-space-8);
}

.container-narrow {
    max-width: var(--brand-container-narrow);
}

/* Section Spacing */
section {
    padding-top: var(--brand-space-24);
    padding-bottom: var(--brand-space-24);
}

/* ===========================
   COMPONENT FOUNDATIONS
   =========================== */

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--brand-space-3) var(--brand-space-6);
    font-family: var(--brand-font-sans);
    font-size: var(--brand-text-base);
    font-weight: var(--brand-weight-medium);
    line-height: var(--brand-leading-normal);
    border: none;
    border-radius: var(--brand-radius-sm);
    cursor: pointer;
    transition: all var(--brand-transition-base);
    text-decoration: none;
}

.btn-primary {
    background-color: var(--brand-olive);
    color: var(--brand-text-inverse);
    text-transform: uppercase;
    letter-spacing: var(--brand-tracking-wider);
    font-size: var(--brand-text-sm);
    padding: var(--brand-space-4) var(--brand-space-8);
}

.btn-primary:hover {
    background-color: var(--brand-olive-dark);
    color: var(--brand-text-inverse);
}

.btn-secondary {
    background-color: transparent;
    color: var(--brand-accent-primary);
    border: var(--brand-border-width) solid var(--brand-accent-primary);
}

.btn-secondary:hover {
    background-color: var(--brand-accent-subtle);
    border-color: var(--brand-accent-hover);
    color: var(--brand-accent-hover);
}

/* Cards */
.card {
    background-color: var(--brand-bg-primary);
    border: var(--brand-border-width) solid var(--brand-border-light);
    border-radius: var(--brand-radius-md);
    padding: var(--brand-space-8);
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--brand-space-1) var(--brand-space-3);
    font-size: var(--brand-text-xs);
    font-weight: var(--brand-weight-medium);
    letter-spacing: var(--brand-tracking-wider);
    text-transform: uppercase;
    border-radius: var(--brand-radius-sm);
    background-color: var(--brand-accent-subtle);
    color: var(--brand-accent-primary);
}

/* Dividers */
.divider {
    height: var(--brand-border-width);
    background-color: var(--brand-border-light);
    border: none;
    margin: var(--brand-space-8) 0;
}

/* ===========================
   UTILITY CLASSES
   =========================== */

/* Spacing */
.mt-0 { margin-top: 0; }
.mt-4 { margin-top: var(--brand-space-4); }
.mt-8 { margin-top: var(--brand-space-8); }
.mt-12 { margin-top: var(--brand-space-12); }
.mt-16 { margin-top: var(--brand-space-16); }

.mb-0 { margin-bottom: 0; }
.mb-4 { margin-bottom: var(--brand-space-4); }
.mb-8 { margin-bottom: var(--brand-space-8); }
.mb-12 { margin-bottom: var(--brand-space-12); }
.mb-16 { margin-bottom: var(--brand-space-16); }

/* Text Alignment */
.text-left { text-align: left; }
.text-center { text-align: center; }
.text-right { text-align: right; }

/* Text Colors */
.text-primary { color: var(--brand-text-primary); }
.text-secondary { color: var(--brand-text-secondary); }
.text-tertiary { color: var(--brand-text-tertiary); }
.text-accent { color: var(--brand-accent-primary); }

/* Background Colors */
.bg-white { background-color: var(--brand-bg-primary); }
.bg-parchment { background-color: var(--brand-bg-secondary); }
.bg-dark { background-color: var(--brand-bg-dark); }

/* ===========================
   LOGO DARK MODE SUPPORT
   =========================== */

/* Automatic logo switching for dark mode (if section uses dark background) */
.who-section .logo-img,
.bg-dark .logo-img,
[data-theme="dark"] .logo-img {
    content: url('public/brand/logo-dark.png');
}

.logo-light-bg .logo-wordmark,
.logo-light-bg .logo-img {
    content: url('public/brand/GreenfieldCropped.png');
}

/* System dark mode preference (optional - currently using logo-dark by default) */
@media (prefers-color-scheme: dark) {
    /* Uncomment to enable automatic dark mode logo switching:
    .logo-img {
        content: url('public/brand/GreenfieldCropped.png');
    }
    */
}

/* ===========================
   RESPONSIVE BREAKPOINTS
   =========================== */

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    body {
        font-size: var(--brand-text-base);
    }
    
    h1 {
        font-size: var(--brand-text-3xl);
    }
    
    h2 {
        font-size: var(--brand-text-2xl);
    }
    
    section {
        padding-top: var(--brand-space-16);
        padding-bottom: var(--brand-space-16);
    }
    
    .container {
        padding-left: var(--brand-space-4);
        padding-right: var(--brand-space-4);
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    h1 {
        font-size: var(--brand-text-2xl);
    }
    
    section {
        padding-top: var(--brand-space-12);
        padding-bottom: var(--brand-space-12);
    }
}