/* ============================================
   Scaftra Design System - Base
   Reset, variables, typography, utilities
   ============================================ */

/* --- Reset --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 16px;
    line-height: 1.6;
    color: var(--gray-900);
    background: var(--white);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

/* --- CSS Variables --- */
:root {
    /* Primary - deep blue-teal */
    --primary-50: #f0f7fa;
    --primary-100: #d9edf4;
    --primary-200: #b3dbe9;
    --primary-300: #7dc2d9;
    --primary-400: #4da8c7;
    --primary-500: #3a8fba;
    --primary-600: #2e7399;
    --primary-700: #265d7d;
    --primary-800: #1f4d68;
    --primary-900: #1a3f56;
    --primary-950: #0f2838;

    /* Accent - warm orange */
    --accent: #ff6b35;
    --accent-hover: #e55a28;
    --accent-light: #fff0ea;

    /* Neutrals */
    --white: #ffffff;
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    --gray-950: #030712;

    /* Functional */
    --success: #10b981;
    --success-light: #ecfdf5;
    --warning: #f59e0b;
    --warning-light: #fffbeb;
    --error: #ef4444;
    --error-light: #fef2f2;

    /* Spacing */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    --space-5xl: 128px;

    /* Typography */
    --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;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.07), 0 2px 4px -2px rgba(0, 0, 0, 0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.08), 0 4px 6px -4px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.08), 0 8px 10px -6px rgba(0, 0, 0, 0.04);

    /* Borders */
    --radius-sm: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;
    --radius-full: 9999px;

    /* Layout */
    --container-max: 1200px;
    --container-narrow: 800px;
}

/* --- Typography --- */
h1, h2, h3, h4, h5, h6 {
    line-height: 1.15;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--gray-900);
}

h1 {
    font-size: var(--text-6xl);
    letter-spacing: -0.03em;
}

h2 {
    font-size: var(--text-4xl);
}

h3 {
    font-size: var(--text-xl);
    font-weight: 600;
}

h4 {
    font-size: var(--text-lg);
    font-weight: 600;
}

p {
    color: var(--gray-600);
}

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

.container-narrow {
    max-width: var(--container-narrow);
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

.section {
    padding: var(--space-5xl) 0;
}

.section-dark {
    background: var(--primary-950);
    color: var(--white);
}

.section-dark h1,
.section-dark h2,
.section-dark h3,
.section-dark h4 {
    color: var(--white);
}

.section-dark p {
    color: var(--primary-200);
}

.section-alt {
    background: var(--gray-50);
}

/* --- Scroll Reveal --- */
.reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger children */
.reveal-stagger > *:nth-child(1) { transition-delay: 0s; }
.reveal-stagger > *:nth-child(2) { transition-delay: 0.08s; }
.reveal-stagger > *:nth-child(3) { transition-delay: 0.16s; }
.reveal-stagger > *:nth-child(4) { transition-delay: 0.24s; }
.reveal-stagger > *:nth-child(5) { transition-delay: 0.32s; }

@media (prefers-reduced-motion: reduce) {
    .reveal {
        opacity: 1;
        transform: none;
        transition: none;
    }
}

/* --- Utilities --- */
.skip-link {
    position: absolute;
    top: -100%;
    left: 0;
    padding: 8px 16px;
    background: var(--primary-500);
    color: var(--white);
    z-index: 200;
    font-size: var(--text-sm);
    font-weight: 600;
    border-radius: 0 0 var(--radius-md) 0;
}

.skip-link:focus {
    top: 0;
}

.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

.text-center { text-align: center; }
.text-left { text-align: left; }

.mt-sm { margin-top: var(--space-sm); }
.mt-md { margin-top: var(--space-md); }
.mt-lg { margin-top: var(--space-lg); }
.mt-xl { margin-top: var(--space-xl); }
.mt-2xl { margin-top: var(--space-2xl); }
.mt-3xl { margin-top: var(--space-3xl); }

.mb-sm { margin-bottom: var(--space-sm); }
.mb-md { margin-bottom: var(--space-md); }
.mb-lg { margin-bottom: var(--space-lg); }
.mb-xl { margin-bottom: var(--space-xl); }

/* Section header pattern */
.section-label {
    display: inline-block;
    font-size: var(--text-sm);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.08em;
    color: var(--primary-500);
    margin-bottom: var(--space-md);
}

.section-dark .section-label {
    color: var(--accent);
}

.section-heading {
    font-size: var(--text-4xl);
    margin-bottom: var(--space-md);
}

.section-sub {
    font-size: var(--text-lg);
    color: var(--gray-500);
    max-width: 640px;
}

.text-center .section-sub {
    margin-left: auto;
    margin-right: auto;
}

/* --- Responsive --- */
@media (max-width: 992px) {
    h1 { font-size: var(--text-5xl); }
    h2 { font-size: var(--text-3xl); }
    .section { padding: var(--space-4xl) 0; }
}

@media (max-width: 768px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-2xl); }
    .section { padding: var(--space-3xl) 0; }
}

@media (max-width: 576px) {
    h1 { font-size: var(--text-3xl); }
    .container { padding: 0 var(--space-md); }
}