/* ===== DESIGN SYSTEM - VARIABLES GLOBALES ===== */

:root {
    /* === Couleurs === */
    --color-bg-primary: #FAFBFC;
    --color-bg-secondary: #FFFFFF;
    --color-bg-tertiary: #F8F9FA;

    --color-text-primary: #1a2332;
    --color-text-secondary: #5a6c7d;
    --color-text-muted: #8b95a3;

    --color-accent-primary: #00b4d8;
    --color-accent-hover: #0096b8;
    --color-accent-light: #e6f7fb;

    --color-border: #e2e8f0;
    --color-border-light: #eef2f6;

    /* === Typographie === */
    --font-family-primary: 'Inter', 'Segoe UI', 'Calibri', Arial, sans-serif;
    --font-family-heading: 'Inter', 'Segoe UI', Arial, sans-serif;

    --font-size-xs: 0.75rem;
    /* 12px */
    --font-size-sm: 0.875rem;
    /* 14px */
    --font-size-base: 1rem;
    /* 16px */
    --font-size-lg: 1.125rem;
    /* 18px */
    --font-size-xl: 1.25rem;
    /* 20px */
    --font-size-2xl: 1.5rem;
    /* 24px */
    --font-size-3xl: 1.875rem;
    /* 30px */
    --font-size-4xl: 2.25rem;
    /* 36px */
    --font-size-5xl: 3rem;
    /* 48px */

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

    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;

    /* === Espacements === */
    --spacing-xs: 0.25rem;
    /* 4px */
    --spacing-sm: 0.5rem;
    /* 8px */
    --spacing-md: 1rem;
    /* 16px */
    --spacing-lg: 1.5rem;
    /* 24px */
    --spacing-xl: 2rem;
    /* 32px */
    --spacing-2xl: 3rem;
    /* 48px */
    --spacing-3xl: 4rem;
    /* 64px */
    --spacing-4xl: 6rem;
    /* 96px */

    /* === Layout === */
    --container-max-width: 1200px;
    --container-padding: 2rem;
    --container-padding-mobile: 1.5rem;

    --header-height: 85px;
    --header-height-mobile: 75px;

    /* === Bordures et ombres === */
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 12px;
    --border-radius-xl: 16px;
    --border-radius-full: 9999px;

    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
    --shadow-hover: 0 12px 35px rgba(0, 180, 216, 0.15);
    --shadow-elevated: 0 20px 40px rgba(0, 0, 0, 0.15);
    --shadow-ultra: 0 30px 60px rgba(0, 0, 0, 0.25);

    /* === Transitions === */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
    --transition-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
    --transition-smooth: cubic-bezier(0.4, 0, 0.2, 1);

    /* === Animations === */
    --animation-duration-fast: 200ms;
    --animation-duration-normal: 300ms;
    --animation-duration-slow: 500ms;

    /* === Gradients Modernes === */
    --gradient-mesh:
        radial-gradient(at 40% 20%, hsla(240, 100%, 70%, 0.08) 0px, transparent 50%),
        radial-gradient(at 80% 80%, hsla(180, 100%, 70%, 0.08) 0px, transparent 50%),
        radial-gradient(at 0% 50%, hsla(200, 100%, 70%, 0.05) 0px, transparent 50%);

    /* === Project-specific colors === */
    --color-projet-integrateur: #11998e;

    /* === Breakpoints (pour référence) === */
    --breakpoint-mobile: 768px;
    --breakpoint-tablet: 1024px;
    --breakpoint-desktop: 1280px;
}

/* ===== DARK MODE VARIABLES ===== */
[data-theme="dark"] {
    /* === Couleurs Mode Sombre === */
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;

    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-muted: #94a3b8;

    --color-accent-primary: #00b4d8;
    --color-accent-hover: #00d4ff;
    --color-accent-light: rgba(0, 180, 216, 0.15);

    --color-border: #334155;
    --color-border-light: #475569;

    /* === Ombres adaptées au mode sombre === */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.5);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.6);
    --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.7);
    --shadow-hover: 0 12px 35px rgba(0, 180, 216, 0.25);
}

/* === DARK MODE SPECIFIC STYLES === */

[data-theme="dark"] .footer {
    background-color: #0a0f1a;
    border-top: 1px solid var(--color-border);
}

[data-theme="dark"] .nav-header {
    border-bottom: 1px solid var(--color-border);
}

/* === DARK MODE - IMAGE CONTAINERS === */

[data-theme="dark"] [style*="background-color: white"],
[data-theme="dark"] [style*="background-color:#fff"],
[data-theme="dark"] [style*="background-color: #fff"] {
    background-color: var(--color-bg-secondary) !important;
}

/* === DARK MODE - CALLOUTS === */

[data-theme="dark"] .callout,
[data-theme="dark"] [style*="background-color: #f0fdf4"],
[data-theme="dark"] [style*="background-color: #f8fafc"] {
    background-color: var(--color-bg-tertiary) !important;
    border-left-color: var(--color-accent-primary) !important;
}

[data-theme="dark"] .callout-title {
    color: var(--color-accent-primary) !important;
}

/* === DARK MODE - FOOTER TEXT === */

[data-theme="dark"] .footer {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .footer-section h4 {
    color: var(--color-text-primary);
}

[data-theme="dark"] .footer-links a {
    color: var(--color-text-secondary);
}

[data-theme="dark"] .footer-bottom {
    color: var(--color-text-muted);
}

/* ===== RESET ET BASE ===== */

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

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

body {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===== TYPOGRAPHIE ===== */

h1,
h2,
h3,
h4,
h5,
h6 {
    font-family: var(--font-family-heading);
    font-weight: var(--font-weight-bold);
    line-height: var(--line-height-tight);
    color: var(--color-text-primary);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--font-size-4xl);
    letter-spacing: -0.02em;
}

h2 {
    font-size: var(--font-size-3xl);
    letter-spacing: -0.01em;
}

h3 {
    font-size: var(--font-size-2xl);
}

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

h5 {
    font-size: var(--font-size-lg);
}

h6 {
    font-size: var(--font-size-base);
}

p {
    margin-bottom: var(--spacing-md);
    line-height: var(--line-height-relaxed);
}

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

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

/* ===== UTILITAIRES ===== */

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

.section {
    padding: var(--spacing-4xl) 0;
}

.section-sm {
    padding: var(--spacing-3xl) 0;
}

.section-lg {
    padding: calc(var(--spacing-4xl) * 1.5) 0;
}

/* Grille responsive */
.grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

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

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

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

.flex-between {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

/* Espacements utilitaires */
.mt-sm {
    margin-top: var(--spacing-sm);
}

.mt-md {
    margin-top: var(--spacing-md);
}

.mt-lg {
    margin-top: var(--spacing-lg);
}

.mt-xl {
    margin-top: var(--spacing-xl);
}

.mb-sm {
    margin-bottom: var(--spacing-sm);
}

.mb-md {
    margin-bottom: var(--spacing-md);
}

.mb-lg {
    margin-bottom: var(--spacing-lg);
}

.mb-xl {
    margin-bottom: var(--spacing-xl);
}

/* Text alignment */
.text-center {
    text-align: center;
}

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

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

/* === Utility Flex Layouts === */
.flex-center-gap {
    display: flex;
    gap: var(--spacing-2xl);
    justify-content: center;
    align-items: center;
    color: var(--color-text-secondary);
    opacity: 0.8;
}

.flex-gap-4xl {
    gap: var(--spacing-4xl);
}

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

@media (max-width: 768px) {
    :root {
        --font-size-4xl: 2rem;
        /* 32px */
        --font-size-3xl: 1.5rem;
        /* 24px */
        --font-size-2xl: 1.25rem;
        /* 20px */
    }

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

    .section {
        padding: var(--spacing-3xl) 0;
    }

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

@media (min-width: 769px) and (max-width: 1024px) {

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

/* ===== GLASSMORPHISM HEADER ===== */

/* Mode clair - flou léger (5px) + fond blanc très transparent */
:root .glassmorphism-header {
    background: rgba(255, 255, 255, 0.1) !important;
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Mode sombre - flou plus fort (10px) + fond gris foncé transparent */
[data-theme="dark"] .glassmorphism-header {
    background: rgba(30, 41, 59, 0.3) !important;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}