/* ========================================
   GLOBAL STYLES - Architecture Brutaliste
   ======================================== */

/* Variables CSS */
:root {
    /* Couleurs - Palette architecturale */
    --concrete: #D4D2CE;
    --concrete-light: #E8E6E3;
    --charcoal: #1C1C1C;
    --charcoal-light: #2C2C2C;
    --steel-blue: #4A6C7A;
    --steel-blue-dark: #3A5C6A;
    --warm-gray: #8B8680;
    --warm-gray-light: #A09B95;
    --accent-orange: #E67E22;
    --accent-orange-dark: #D35400;

    /* RGB Values for RGBA */
    --charcoal-rgb: 28, 28, 28;
    --charcoal-light-rgb: 44, 44, 44;
    --steel-blue-rgb: 74, 108, 122;

    /* Espacement - Grille 8px */
    --grid-unit: 8px;
    --space-xs: calc(var(--grid-unit) * 1);   /* 8px */
    --space-sm: calc(var(--grid-unit) * 2);   /* 16px */
    --space-md: calc(var(--grid-unit) * 3);   /* 24px */
    --space-lg: calc(var(--grid-unit) * 4);   /* 32px */
    --space-xl: calc(var(--grid-unit) * 6);   /* 48px */
    --space-2xl: calc(var(--grid-unit) * 8);  /* 64px */
    --space-3xl: calc(var(--grid-unit) * 10); /* 80px */

    /* Typography */
    --font-primary: 'Helvetica Neue', -apple-system, BlinkMacSystemFont, 'Segoe UI', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Courier New', monospace;

    /* Layout */
    --max-width: 1400px;
    --content-width: 1200px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);

    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(var(--charcoal-rgb), 0.1);
    --shadow-md: 0 4px 8px rgba(var(--charcoal-rgb), 0.15);
    --shadow-lg: 0 8px 24px rgba(var(--charcoal-rgb), 0.2);
    --shadow-xl: 0 16px 48px rgba(var(--charcoal-rgb), 0.25);
}

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

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

body {
    font-family: var(--font-primary);
    font-size: 1rem;
    line-height: 1.6;
    color: var(--charcoal);
    background-color: var(--concrete);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Grid Overlay - Architectural touch */
.grid-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 9999;
    opacity: 0.03;
    background-image:
        repeating-linear-gradient(0deg, transparent, transparent 7px, var(--charcoal) 8px),
        repeating-linear-gradient(90deg, transparent, transparent 7px, var(--charcoal) 8px);
    mix-blend-mode: multiply;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 900;
    line-height: 1.1;
    text-transform: uppercase;
    letter-spacing: -0.02em;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: clamp(1.25rem, 2.5vw, 1.5rem); }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

p {
    margin-bottom: var(--space-md);
}

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

a:hover {
    color: var(--steel-blue-dark);
}

strong {
    font-weight: 700;
    color: var(--steel-blue);
}

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

/* Navigation */
.main-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--charcoal);
    z-index: 1000;
    border-bottom: 4px solid var(--steel-blue);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-sm) var(--space-md);
}

.logo {
    font-size: 1.5rem;
    font-weight: 900;
    color: var(--concrete);
    text-transform: uppercase;
    letter-spacing: -0.05em;
    transition: color var(--transition-fast);
}

.logo:hover {
    color: var(--accent-orange);
}

.nav-links {
    display: flex;
    gap: var(--space-lg);
    list-style: none;
}

.nav-links a {
    color: var(--concrete);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    position: relative;
    transition: color var(--transition-fast);
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--accent-orange);
    transition: width var(--transition-base);
}

.nav-links a:hover::after,
.nav-links a.active::after {
    width: 100%;
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1000;
}

.nav-toggle span {
    display: block;
    width: 24px;
    height: 3px;
    background: var(--concrete);
    transition: all var(--transition-base);
}

.nav-toggle.nav-active span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.nav-toggle.nav-active span:nth-child(2) {
    opacity: 0;
}

.nav-toggle.nav-active span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-weight: 700;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 2px solid transparent;
    cursor: pointer;
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--charcoal);
    color: var(--concrete);
    border-color: var(--charcoal);
}

.btn-primary:hover {
    background: var(--charcoal-light);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
    color: var(--concrete);
}

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

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

.btn-contact {
    background: var(--steel-blue);
    color: var(--concrete);
    border-color: var(--steel-blue);
}

.btn-contact:hover {
    background: var(--steel-blue-dark);
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
    color: var(--concrete);
}

.btn-icon {
    width: 20px;
    height: 20px;
    stroke-width: 2;
}

/* Tags & Badges */
.tag, .tech-tag, .skill-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    background: var(--warm-gray);
    color: var(--charcoal);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.tech-badge {
    background: var(--steel-blue);
    color: var(--concrete);
}

/* Footer */
.main-footer {
    background: var(--charcoal);
    color: var(--concrete);
    padding: var(--space-lg) 0;
    margin-top: var(--space-3xl);
    text-align: center;
}

.footer-content {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* Accessibility */
.skip-link {
    position: absolute;
    top: -40px;
    left: 6px;
    background: var(--charcoal);
    color: var(--concrete);
    padding: 8px;
    z-index: 10000;
    text-decoration: none;
    border-radius: 4px;
    transition: top var(--transition-fast);
}

.skip-link:focus {
    top: 6px;
}

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

.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); }

.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); }

/* Responsive */
@media (max-width: 768px) {
    :root {
        --grid-unit: 6px;
    }

    .nav-links {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(var(--charcoal-rgb), 0.95);
        backdrop-filter: blur(8px);
        display: flex;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        transform: translateX(100%);
        transition: transform var(--transition-base);
        gap: var(--space-xl);
        z-index: 1000;
    }

    .nav-links.nav-open {
        transform: translateX(0);
    }

    .nav-links a {
        font-size: 1.5rem;
        opacity: 1;
        transform: none;
    }

    .nav-toggle {
        display: flex;
    }

    .container {
        padding: 0 var(--space-sm);
    }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }
    h3 { font-size: 1.25rem; }
}