/* =====================================================
   DSi Atlantic - CORE STYLES
   Reset, Variables, Typographie, Layout, Boutons, Header
   =====================================================
   
   Ce fichier contient les styles fondamentaux du site.
   Pour les styles de pages spécifiques, voir pages.css
   
   ===================================================== */

/* =====================================================
   1. CSS RESET & BASE
   ===================================================== */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 1.125rem;
    line-height: 1.75;
    color: var(--gray-700);
    background-color: var(--white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

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

ul,
ol {
    list-style: none;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

/* =====================================================
   2. CSS CUSTOM PROPERTIES (Design Tokens)
   ===================================================== */
:root {
    /* ---- Couleurs Bleu Nuit (Principale) ---- */
    --primary-900: #0a1628;
    --primary-800: #1a2744;
    --primary-700: #2a3d5f;
    --primary-600: #3d5a80;
    --primary-500: #5e81ac;
    --primary-400: #88a5c7;
    --primary-300: #a8c0d8;
    --primary-200: #c8d9e8;
    --primary-100: #e8f0f6;

    /* ---- Couleurs Neutres ---- */
    --white: #ffffff;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;

    /* ---- Couleurs d'Accent ---- */
    --accent: #2563eb;
    --accent-light: #3b82f6;
    --accent-dark: #1d4ed8;

    /* ---- Couleurs Sémantiques ---- */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --error: #ef4444;
    --error-light: #fee2e2;

    /* ---- Typographie ---- */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --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;

    --font-light: 300;
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;

    /* ---- Espacements ---- */
    --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;

    /* ---- Bordures ---- */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* ---- Ombres ---- */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);

    /* ---- Transitions ---- */
    --transition-fast: 150ms ease;
    --transition-base: 200ms ease;
    --transition-slow: 300ms ease;
    --transition-slower: 500ms ease;

    /* ---- Z-Index ---- */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;

    /* ---- Layout ---- */
    --container-sm: 640px;
    --container-md: 768px;
    --container-lg: 1024px;
    --container-xl: 1200px;
    --container-2xl: 1400px;
}

/* =====================================================
   3. TYPOGRAPHIE
   ===================================================== */
h1,
h2,
h3,
h4,
h5,
h6 {
    color: var(--gray-900);
    font-weight: var(--font-semibold);
    line-height: 1.2;
    margin-bottom: var(--space-4);
}

h1 {
    font-size: clamp(var(--text-4xl), 5vw, var(--text-6xl));
    font-weight: var(--font-bold);
    letter-spacing: -0.02em;
}

h2 {
    font-size: clamp(var(--text-3xl), 4vw, var(--text-5xl));
    letter-spacing: -0.01em;
}

h3 {
    font-size: clamp(var(--text-2xl), 3vw, var(--text-3xl));
}

h4 {
    font-size: var(--text-xl);
}

p {
    margin-bottom: var(--space-4);
}

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

.text-lead {
    font-size: var(--text-xl);
    color: var(--gray-600);
    line-height: 1.6;
}

.text-small {
    font-size: var(--text-sm);
}

.text-muted {
    color: var(--gray-500);
}

.text-primary {
    color: var(--primary-600);
}

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

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

/* =====================================================
   4. LAYOUT & CONTAINER
   ===================================================== */
.container {
    width: 100%;
    max-width: var(--container-xl);
    margin-left: auto;
    margin-right: auto;
    padding-left: var(--space-6);
    padding-right: var(--space-6);
}

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

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

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

section {
    padding: var(--space-20) 0;
}

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

.section-dark {
    background-color: var(--primary-900);
    color: var(--white);
}

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

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

/* Grid System */
.grid {
    display: grid;
    gap: var(--space-8);
}

.grid-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .grid-4 {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {

    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }

    section {
        padding: var(--space-16) 0;
    }
}

/* Flexbox Utilities */
.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-2 {
    gap: var(--space-2);
}

.gap-4 {
    gap: var(--space-4);
}

.gap-6 {
    gap: var(--space-6);
}

.gap-8 {
    gap: var(--space-8);
}

/* =====================================================
   5. BOUTONS
   ===================================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-8);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    text-decoration: none;
    white-space: nowrap;
}

.btn-primary {
    background-color: var(--accent);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background-color: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}

.btn-secondary:hover {
    background-color: var(--gray-50);
    border-color: var(--gray-400);
}

.btn-outline {
    background-color: transparent;
    color: var(--accent);
    border: 2px solid var(--accent);
}

.btn-outline:hover {
    background-color: var(--accent);
    color: var(--white);
}

.btn-ghost {
    background-color: transparent;
    color: var(--gray-700);
}

.btn-ghost:hover {
    background-color: var(--gray-100);
}

.btn-lg {
    padding: var(--space-5) var(--space-10);
    font-size: var(--text-lg);
}

.btn-sm {
    padding: var(--space-2) var(--space-4);
    font-size: var(--text-sm);
}

/* Bouton sur fond sombre */
.section-dark .btn-primary {
    background-color: var(--white);
    color: var(--primary-900);
}

.section-dark .btn-primary:hover {
    background-color: var(--gray-100);
}

.section-dark .btn-outline {
    border-color: var(--white);
    color: var(--white);
}

.section-dark .btn-outline:hover {
    background-color: var(--white);
    color: var(--primary-900);
}

/* =====================================================
   6. HEADER & NAVIGATION
   ===================================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: var(--z-fixed);
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--gray-200);
    transition: all var(--transition-base);
}

.header.scrolled {
    background-color: rgba(255, 255, 255, 0.85);
    box-shadow: var(--shadow-md);
}

.header-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    padding: 0 var(--space-6);
    max-width: var(--container-xl);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    font-size: var(--text-xl);
    font-weight: var(--font-bold);
    color: var(--primary-900);
}

.logo img {
    height: 68px;
    width: auto;
    max-width: 280px;
}

.logo svg {
    width: 40px;
    height: 40px;
}

.nav {
    display: flex;
    align-items: center;
    gap: var(--space-8);
}

.nav-link {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    color: var(--gray-700);
    transition: color var(--transition-fast);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--accent);
}

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

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

.nav-cta {
    margin-left: var(--space-4);
}

/* Mobile Menu Toggle - Premium Animation */
.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 48px;
    height: 48px;
    padding: 0;
    cursor: pointer;
    z-index: 1000;
    position: relative;
    background: transparent;
    border-radius: var(--radius-lg);
    transition: background-color 0.2s ease;
}

.menu-toggle:hover {
    background-color: var(--gray-100);
}

.menu-toggle span {
    display: block;
    width: 22px;
    height: 2.5px;
    background-color: var(--primary-900);
    border-radius: 3px;
    position: absolute;
    transition: transform 0.4s cubic-bezier(0.23, 1, 0.32, 1),
        opacity 0.3s ease,
        width 0.3s ease;
}

.menu-toggle span:nth-child(1) {
    width: 22px;
    transform: translateY(-7px);
}

.menu-toggle span:nth-child(2) {
    width: 18px;
    transform: translateX(-2px);
}

.menu-toggle span:nth-child(3) {
    width: 22px;
    transform: translateY(7px);
}

.menu-toggle:hover span:nth-child(2) {
    width: 22px;
    transform: translateX(0);
}

/* Hamburger to X animation */
.menu-toggle.active span {
    width: 22px;
}

.menu-toggle.active span:nth-child(1) {
    transform: translateY(0) rotate(45deg);
}

.menu-toggle.active span:nth-child(2) {
    opacity: 0;
    transform: translateX(10px);
}

.menu-toggle.active span:nth-child(3) {
    transform: translateY(0) rotate(-45deg);
}

@media (max-width: 768px) {
    .menu-toggle {
        display: flex;
    }

    .nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100%;
        height: 100vh;
        flex-direction: column;
        justify-content: center;
        align-items: center;
        background: rgba(255, 255, 255, 0.92);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        padding: var(--space-8);
        gap: 0;
        opacity: 0;
        pointer-events: none;
        transition: opacity 0.4s cubic-bezier(0.23, 1, 0.32, 1);
        z-index: 999;
    }

    .nav.active {
        opacity: 1;
        pointer-events: auto;
    }

    /* Staggered link animations */
    .nav-link,
    .nav-cta {
        opacity: 0;
        transform: translateY(20px);
        transition: opacity 0.4s ease, transform 0.4s ease, color 0.2s ease;
    }

    .nav.active .nav-link:nth-child(1) {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0.1s;
    }

    .nav.active .nav-link:nth-child(2) {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0.15s;
    }

    .nav.active .nav-link:nth-child(3) {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0.2s;
    }

    .nav.active .nav-link:nth-child(4) {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0.25s;
    }

    .nav.active .nav-cta {
        opacity: 1;
        transform: translateY(0);
        transition-delay: 0.3s;
    }

    .nav-link {
        font-size: var(--text-2xl);
        font-weight: var(--font-semibold);
        color: var(--primary-900);
        padding: var(--space-4) var(--space-6);
        display: block;
        position: relative;
    }

    .nav-link::before {
        content: '';
        position: absolute;
        bottom: 8px;
        left: 50%;
        width: 0;
        height: 2px;
        background: var(--accent);
        transition: width 0.3s ease, left 0.3s ease;
        border-radius: 2px;
    }

    .nav-link:hover::before {
        width: 60%;
        left: 20%;
    }

    .nav-link:hover,
    .nav-link.active {
        color: var(--accent);
    }

    .nav-link::after {
        display: none;
    }

    .nav-cta {
        margin-left: 0;
        margin-top: var(--space-6);
        font-size: var(--text-lg);
    }
}