/* css/main.css - Core styles and variables */

:root {
    /* Primary - Institutional Blue - Trust, Security */
    --color-primary-900: #0A2742;
    --color-primary-800: #0D3C63;
    --color-primary-700: #0F4C81;
    --color-primary-600: #1F5D93;
    --color-primary-500: #3873A9;
    --color-primary-400: #5C91BF;
    --color-primary-300: #89B3D6;
    --color-primary-200: #BAD5EA;
    --color-primary-100: #DCEAF5;
    --color-primary-50: #F3F8FC;

    /* Secondary - Accessibility Green - Inclusion, Sustainability */
    --color-secondary-900: #123C28;
    --color-secondary-800: #1B5A3A;
    --color-secondary-700: #2E8B57;
    --color-secondary-600: #3C9D66;
    --color-secondary-500: #56B37D;
    --color-secondary-400: #78C69C;
    --color-secondary-300: #A2D9BB;
    --color-secondary-200: #C9ECD8;
    --color-secondary-100: #E5F6EB;
    --color-secondary-50: #F4FBF6;

    /* Accent - Mobility Orange - Action, Movement */
    --color-accent-900: #7C4305;
    --color-accent-800: #A86407;
    --color-accent-700: #D97706;
    --color-accent-600: #F59E0B;
    --color-accent-500: #F7AF34;
    --color-accent-400: #F9C264;
    --color-accent-300: #FBD796;
    --color-accent-200: #FDE7BC;
    --color-accent-100: #FEF3DE;
    --color-accent-50: #FFF9EE;

    /* Neutral Grayscale */
    --color-gray-900: #1F2937;
    --color-gray-800: #273244;
    --color-gray-700: #374151;
    --color-gray-600: #4B5563;
    --color-gray-500: #6B7280;
    --color-gray-400: #8B95A7;
    --color-gray-300: #B6C0CF;
    --color-gray-200: #D7DEE8;
    --color-gray-150: #E5EBF2;
    --color-gray-100: #EEF4F8;
    --color-gray-50: #F8FAFC;

    /* Semantic Colors */
    --color-success: #16A34A;
    --color-success-bg: #DCFCE7;
    --color-warning: #F59E0B;
    --color-warning-bg: #FEF3C7;
    --color-error: #DC2626;
    --color-error-bg: #FEE2E2;
    --color-info: #2563EB;
    --color-info-bg: #DBEAFE;

    /* Background & Surface */
    --color-background: var(--color-gray-50);
    --color-background-alt: var(--color-gray-100);
    --color-surface: #FFFFFF;
    --color-surface-alt: #FFFFFF;
    --color-surface-muted: #F4F8FB;
    --color-surface-hover: var(--color-primary-50);

    /* Text */
    --color-text-primary: var(--color-gray-900);
    --color-text-secondary: var(--color-gray-600);
    --color-text-tertiary: var(--color-gray-500);
    --color-text-inverse: #FFFFFF;
    --color-text-link: var(--color-primary-700);

    /* Borders */
    --color-border: rgba(15, 76, 129, 0.12);
    --color-border-light: var(--color-gray-150);
    --color-border-dark: rgba(15, 76, 129, 0.22);
    --color-border-strong: rgba(15, 76, 129, 0.22);

    /* Compatibility aliases for existing site styles */
    --color-primary: var(--color-primary-700);
    --color-primary-dark: var(--color-primary-800);
    --color-secondary: var(--color-secondary-700);
    --color-secondary-dark: var(--color-secondary-800);
    --color-accent: var(--color-accent-600);
    --color-accent-dark: var(--color-accent-700);
    --color-accent-soft: var(--color-accent-200);
    --color-text: var(--color-text-primary);
    --color-text-light: var(--color-text-secondary);
    --color-text-lighter: var(--color-text-tertiary);

    /* Typography Scale */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --font-display: 'Inter', 'Source Serif Pro', Georgia, serif;
    --font-serif: 'Source Serif Pro', Georgia, serif;

    --text-4xl: clamp(2.5rem, 5vw, 4rem);
    --text-3xl: clamp(2rem, 3.5vw, 3rem);
    --text-2xl: clamp(1.5rem, 2.5vw, 2rem);
    --text-xl: clamp(1.25rem, 1.8vw, 1.5rem);
    --text-lg: clamp(1.125rem, 1.2vw, 1.25rem);
    --text-base: clamp(1rem, 1vw, 1.125rem);
    --text-sm: clamp(0.875rem, 0.8vw, 0.95rem);
    --text-xs: clamp(0.75rem, 0.6vw, 0.85rem);

    --leading-none: 1;
    --leading-tight: 1.25;
    --leading-normal: 1.5;
    --leading-relaxed: 1.75;
    --leading-loose: 2;

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

    /* Spacing Scale - 8px base */
    --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;
    --space-32: 8rem;
    --space-40: 10rem;

    /* Container */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1280px;
    --container-2xl: 1536px;
    --container-width: var(--container-xl);
    --container-padding: var(--space-6);

    /* Section Spacing */
    --section-padding: clamp(4rem, 8vw, 8rem);
    --section-padding-sm: clamp(3rem, 5vw, 4rem);

    /* Component Spacing */
    --component-gap: clamp(1.5rem, 3vw, 3rem);
    --component-padding: clamp(1.5rem, 2.5vw, 2.5rem);

    /* Compatibility aliases for existing site spacing */
    --spacing-xs: var(--space-2);
    --spacing-sm: var(--space-4);
    --spacing-md: var(--space-8);
    --spacing-lg: var(--space-16);
    --spacing-xl: var(--space-24);

    /* Border Radius */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;

    /* Shadows */
    --shadow-sm: 0 2px 6px rgba(15, 76, 129, 0.08);
    --shadow-md: 0 10px 24px rgba(15, 76, 129, 0.12);
    --shadow-lg: 0 18px 42px rgba(15, 76, 129, 0.16);
    --shadow-xl: 0 24px 56px rgba(15, 76, 129, 0.20);
    --focus-ring: 0 0 0 3px rgba(245, 158, 11, 0.28);

    /* Transitions */
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: var(--text-base);
    color: var(--color-text-primary);
    line-height: var(--leading-relaxed);
    background-color: var(--color-background);
}

/* Container */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    margin-bottom: var(--spacing-sm);
    color: var(--color-primary);
}

h1 {
    font-size: var(--text-4xl);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.025em;
    font-family: var(--font-display);
}

h2 {
    font-size: var(--text-3xl);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
    font-family: var(--font-display);
}

h3 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    letter-spacing: -0.015em;
}

h4 {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    letter-spacing: -0.01em;
}

h5,
h6 {
    font-size: var(--text-lg);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-normal);
}

p {
    margin-bottom: var(--spacing-sm);
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
    color: var(--color-text-secondary);
}

a {
    color: var(--color-text-link);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--color-secondary);
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
.btn:focus-visible {
    outline: none;
    box-shadow: var(--focus-ring);
}

/* Typography Classes */
.heading-1 {
    font-size: var(--text-4xl);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.025em;
    font-family: var(--font-display);
}

.heading-2 {
    font-size: var(--text-3xl);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
    font-family: var(--font-display);
}

.heading-3 {
    font-size: var(--text-2xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    letter-spacing: -0.015em;
}

.heading-4 {
    font-size: var(--text-xl);
    font-weight: var(--weight-semibold);
    line-height: var(--leading-tight);
    letter-spacing: -0.01em;
}

.body-large {
    font-size: var(--text-lg);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
}

.body-base {
    font-size: var(--text-base);
    font-weight: var(--weight-regular);
    line-height: var(--leading-relaxed);
}

.body-small {
    font-size: var(--text-sm);
    font-weight: var(--weight-regular);
    line-height: var(--leading-normal);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius-md);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-base);
    border: 2px solid transparent;
    font-size: var(--text-base);
}

.btn-primary {
    background-color: var(--color-accent);
    color: white;
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background-color: var(--color-accent-dark);
    border-color: var(--color-accent-dark);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background-color: transparent;
    border-color: white;
    color: white;
}

.btn-outline:hover {
    background-color: white;
    color: var(--color-primary);
    transform: translateY(-2px);
}

.btn-large {
    padding: 1rem 2.5rem;
    font-size: var(--text-lg);
}

/* Section Headers */
.section-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.section-header.light {
    color: white;
}

.section-header.light .section-title {
    color: white;
}

.section-header.light .section-subtitle {
    color: rgba(255,255,255,0.9);
}

.section-title {
    font-size: var(--text-3xl);
    font-weight: var(--weight-bold);
    line-height: var(--leading-tight);
    letter-spacing: -0.02em;
    margin-bottom: var(--spacing-sm);
    position: relative;
    display: inline-block;
    font-family: var(--font-display);
}

.section-subtitle {
    font-size: var(--text-lg);
    color: var(--color-text-secondary);
    line-height: var(--leading-relaxed);
    margin-top: -0.5rem;
    margin-bottom: var(--spacing-sm);
}

.title-highlight {
    color: var(--color-secondary);
    position: relative;
    display: inline-block;
}

.title-underline {
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--color-primary), var(--color-accent));
    margin: var(--spacing-sm) auto 0;
    border-radius: 2px;
}

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

.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }
.mt-5 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-xs); }
.mb-2 { margin-bottom: var(--spacing-sm); }
.mb-3 { margin-bottom: var(--spacing-md); }
.mb-4 { margin-bottom: var(--spacing-lg); }
.mb-5 { margin-bottom: var(--spacing-xl); }

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.slide-up {
    animation: slideUp 0.8s ease forwards;
}

/* Responsive */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    :root {
        --spacing-lg: 3rem;
        --spacing-xl: 4rem;
    }
}

@media (max-width: 480px) {
    .container {
        --container-padding: 1rem;
    }
}