/**
 * MP Vision - Thème Dark Premium
 * Design System & Variables CSS
 */

/* ===================================
   1. CSS VARIABLES
   =================================== */

:root {
    /* --- Couleurs principales --- */
    --primary: #8B5CF6;
    --primary-dark: #7C3AED;
    --primary-light: #A78BFA;

    --secondary: #06B6D4;
    --secondary-dark: #0891B2;
    --secondary-light: #22D3EE;

    --accent: #F59E0B;
    --accent-glow: #FBBF24;

    /* --- Backgrounds sombres --- */
    --dark-bg: #0A0A0F;
    --dark-bg-2: #13131A;
    --dark-bg-3: #1C1C26;

    /* --- Textes --- */
    --text-primary: #F9FAFB;
    --text-secondary: #D1D5DB;
    --text-muted: #9CA3AF;

    /* --- Bordures --- */
    --border: #374151;
    --border-light: #4B5563;

    /* --- Gradients --- */
    --gradient-primary: linear-gradient(135deg, #8B5CF6 0%, #06B6D4 100%);
    --gradient-hero: linear-gradient(135deg, #0A0A0F 0%, #1C1C26 50%, #13131A 100%);
    --gradient-card: linear-gradient(145deg, #13131A 0%, #1C1C26 100%);
    --gradient-accent: linear-gradient(90deg, #F59E0B 0%, #FBBF24 100%);

    /* --- Effets & Glows --- */
    --glow-primary: 0 0 40px rgba(139, 92, 246, 0.4);
    --glow-secondary: 0 0 40px rgba(6, 182, 212, 0.4);
    --glow-accent: 0 0 30px rgba(245, 158, 11, 0.5);

    /* --- Ombres --- */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.6);

    /* --- Glassmorphism --- */
    --glass-bg: rgba(28, 28, 38, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);

    /* --- Typographie --- */
    --font-heading: 'Montserrat', sans-serif;
    --font-body: 'Inter', sans-serif;
    --font-code: 'JetBrains Mono', monospace;

    /* --- Tailles de texte --- */
    --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;
    --text-7xl: 4.5rem;

    /* --- Espacements --- */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;

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

    /* --- Transitions --- */
    --transition-fast: 0.15s ease-in-out;
    --transition-base: 0.3s ease-in-out;
    --transition-slow: 0.5s ease-in-out;
}

/* ===================================
   2. RESET & BASE STYLES
   =================================== */

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

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

body {
    font-family: var(--font-body);
    font-size: var(--text-base);
    line-height: 1.6;
    color: var(--text-secondary);
    background-color: var(--dark-bg);
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ===================================
   3. TYPOGRAPHY
   =================================== */

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-4xl); }
h3 { font-size: var(--text-3xl); }
h4 { font-size: var(--text-2xl); }
h5 { font-size: var(--text-xl); }
h6 { font-size: var(--text-lg); }

@media (max-width: 768px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-2xl); }
}

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

a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color var(--transition-base);
}

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

strong {
    font-weight: 600;
    color: var(--text-primary);
}

/* ===================================
   4. LAYOUT
   =================================== */

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-md);
}

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

@media (max-width: 768px) {
    section {
        padding: var(--spacing-2xl) 0;
    }
}

/* ===================================
   5. NAVIGATION
   =================================== */

#mainNav {
    background-color: transparent;
    transition: all var(--transition-base);
    padding-top: var(--spacing-lg) !important;
    padding-bottom: var(--spacing-lg) !important;
}

#mainNav.scrolled {
    background-color: rgba(10, 10, 15, 0.95);
    backdrop-filter: blur(12px);
    box-shadow: var(--shadow-md);
    padding-top: var(--spacing-md) !important;
    padding-bottom: var(--spacing-md) !important;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-heading);
    color: var(--text-primary);
    font-weight: 700;
    font-size: var(--text-xl);
}

.nav-logo {
    height: 40px;
    width: auto;
}

.brand-text {
    display: flex;
    flex-direction: column;
    line-height: 1.2;
}

.brand-tagline {
    font-size: var(--text-xs);
    font-weight: 400;
    color: var(--text-muted);
    font-family: var(--font-body);
}

.navbar-nav .nav-link {
    color: var(--text-secondary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-md);
    transition: color var(--transition-base);
    position: relative;
}

.navbar-nav .nav-link:hover,
.navbar-nav .nav-link.active {
    color: var(--primary-light);
}

.navbar-nav .nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: width var(--transition-base);
}

.navbar-nav .nav-link:hover::after,
.navbar-nav .nav-link.active::after {
    width: 60%;
}

/* Reading Progress Bar */
.reading-progress {
    position: fixed;
    top: 0;
    left: 0;
    width: 0%;
    height: 3px;
    background: var(--gradient-primary);
    z-index: 9999;
    transition: width 0.1s ease-out;
}

/* ===================================
   6. FOOTER
   =================================== */

.footer {
    background-color: var(--dark-bg-2);
    color: var(--text-secondary);
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    border-top: 1px solid var(--border);
    position: relative;
}

.footer-logo {
    height: 50px;
    width: auto;
}

.footer-title {
    color: var(--text-primary);
    font-size: var(--text-xl);
    margin-bottom: var(--spacing-xs);
}

.footer-tagline {
    color: var(--accent);
    font-size: var(--text-sm);
    margin-bottom: var(--spacing-md);
}

.footer-description {
    font-size: var(--text-sm);
    color: var(--text-muted);
}

.footer-heading {
    color: var(--text-primary);
    font-size: var(--text-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.footer-links {
    list-style: none;
    padding: 0;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: var(--text-secondary);
    font-size: var(--text-sm);
    transition: color var(--transition-base);
}

.footer-links a:hover {
    color: var(--primary-light);
}

.footer-contact {
    list-style: none;
    padding: 0;
}

.footer-contact li {
    margin-bottom: var(--spacing-sm);
    display: flex;
    align-items: center;
    font-size: var(--text-sm);
}

.footer-contact a {
    color: var(--text-secondary);
    transition: color var(--transition-base);
}

.footer-contact a:hover {
    color: var(--primary-light);
}

.footer-social {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    transition: all var(--transition-base);
}

.social-link:hover {
    background: var(--primary);
    color: var(--text-primary);
    transform: translateY(-2px);
    box-shadow: var(--glow-primary);
}

.footer-bottom {
    margin-top: var(--spacing-2xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border);
}

.footer-legal {
    list-style: none;
    display: flex;
    gap: var(--spacing-md);
    margin: 0;
    padding: 0;
    justify-content: center;
}

@media (min-width: 768px) {
    .footer-legal {
        justify-content: flex-end;
    }
}

.footer-legal li {
    font-size: var(--text-sm);
}

.footer-legal a {
    color: var(--text-muted);
    transition: color var(--transition-base);
}

.footer-legal a:hover {
    color: var(--text-secondary);
}

/* Back to Top Button */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border: none;
    border-radius: var(--radius-full);
    color: var(--text-primary);
    font-size: var(--text-lg);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    z-index: 1000;
}

.back-to-top.show {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--glow-primary);
}

/* ===================================
   7. UTILITIES
   =================================== */

.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.bg-dark-1 { background-color: var(--dark-bg); }
.bg-dark-2 { background-color: var(--dark-bg-2); }
.bg-dark-3 { background-color: var(--dark-bg-3); }

.glow-primary { box-shadow: var(--glow-primary); }
.glow-secondary { box-shadow: var(--glow-secondary); }
.glow-accent { box-shadow: var(--glow-accent); }