/* Reset and Base Styles */
:root {
    /* Color Palette */
    --color-bg: #faf9f6; /* Very light warm grey/white */
    --color-text-main: #334155; /* Charcoal/Slate */
    --color-text-dark: #0f172a; /* Slate 900 */
    --color-primary: #0a192f; /* Midnight Blue */
    --color-gold: #c5a059; /* Brushed Gold */
    --color-gold-hover: #b48e42;
    --color-gold-light: rgba(197, 160, 89, 0.1);
    --color-surface: #ffffff;
    --color-border: #e2e8f0;
    
    /* Typography */
    --font-heading: 'Playfair Display', serif;
    --font-body: 'Inter', sans-serif;
    
    /* Variables */
    --radius-lg: 12px;
    --radius-md: 8px;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.05), 0 2px 4px -1px rgba(0,0,0,0.03);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
    --shadow-gold: 0 4px 14px 0 rgba(197, 160, 89, 0.39);
}

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 100px;
    font-size: 16px;
}

body {
    font-family: var(--font-body);
    color: var(--color-text-main);
    background-color: var(--color-bg);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    color: var(--color-primary);
    line-height: 1.3;
}

a {
    color: var(--color-primary);
    text-decoration: none;
    transition: color 0.3s ease;
}

a:focus-visible, button:focus-visible, .btn-primary:focus-visible, .btn-outline:focus-visible {
    outline: 2px solid var(--color-gold);
    outline-offset: 4px;
}

/* Typography Utilities */
.lead-text {
    font-size: 1.25rem;
    color: var(--color-text-dark);
    font-weight: 300;
    margin-bottom: 2rem;
    line-height: 1.8;
}

.math-box {
    background: var(--color-surface);
    border-left: 4px solid var(--color-gold);
    padding: 1.5rem;
    margin: 2rem 0;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    box-shadow: var(--shadow-sm);
    overflow-x: auto;
    font-size: 1.1rem;
}

/* Navigation - Glassmorphism */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(226, 232, 240, 0.5);
    z-index: 1000;
    transition: all 0.3s ease;
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.95);
    box-shadow: var(--shadow-sm);
}

.nav-container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-text {
    font-family: var(--font-heading);
    font-weight: 700;
    font-size: 1.25rem;
    color: var(--color-primary);
    letter-spacing: 0.5px;
}

.nav-links {
    list-style: none;
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-links a {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--color-text-main);
}

.nav-links a:hover {
    color: var(--color-gold);
}

/* Hamburger button */
.hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    z-index: 1100;
}

.hamburger span {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
    transform-origin: center;
}

.hamburger.open span:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}
.hamburger.open span:nth-child(2) {
    opacity: 0;
    transform: scaleX(0);
}
.hamburger.open span:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* Buttons */
.btn-primary {
    display: inline-block;
    background-color: var(--color-gold);
    color: white !important;
    padding: 0.8rem 1.8rem;
    border-radius: 30px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-gold);
}

.btn-primary:hover {
    background-color: var(--color-gold-hover);
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(197, 160, 89, 0.4);
}

.btn-outline {
    border: 1px solid var(--color-gold);
    color: var(--color-gold) !important;
    padding: 0.5rem 1.2rem;
    border-radius: 30px;
    transition: all 0.3s ease;
}

.btn-outline:hover {
    background: var(--color-gold);
    color: white !important;
}

/* Hero Section */
.hero {
    background-color: var(--color-primary);
    background-image: radial-gradient(circle at 10% 20%, rgba(197, 160, 89, 0.05) 0%, transparent 40%),
                      radial-gradient(circle at 90% 80%, rgba(197, 160, 89, 0.08) 0%, transparent 40%);
    color: white;
    padding: 12rem 2rem 8rem;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--color-bg);
    transform: skewY(-2deg);
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    z-index: 10;
}

.hero-subtitle {
    color: var(--color-gold);
    font-weight: 600;
    letter-spacing: 2px;
    text-transform: uppercase;
    font-size: 0.85rem;
    display: block;
    margin-bottom: 1rem;
}

.hero-title {
    font-size: 3.5rem;
    color: white;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero-description {
    font-size: 1.1rem;
    color: #cbd5e1;
    margin-bottom: 2.5rem;
}

/* Main Layout */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 4rem 2rem;
    display: flex;
    gap: 4rem;
}

.sidebar {
    width: 250px;
    flex-shrink: 0;
}

.sidebar-inner {
    position: sticky;
    top: 100px;
    background: var(--color-surface);
    padding: 2rem 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
}

.sidebar-inner h3 {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    color: var(--color-text-dark);
}

.sidebar-inner ul {
    list-style: none;
}

.sidebar-inner li {
    margin-bottom: 0.8rem;
}

.sidebar-inner a {
    color: #64748b;
    font-size: 0.95rem;
    display: block;
    padding: 0.4rem 0;
    transition: all 0.2s ease;
    border-left: 2px solid transparent;
    padding-left: 0.8rem;
}

.sidebar-inner a:hover, .sidebar-inner a.active {
    color: var(--color-gold);
    border-left-color: var(--color-gold);
    font-weight: 500;
}

.content {
    flex-grow: 1;
    max-width: 900px;
}

/* Sections */
.section-block {
    margin-bottom: 6rem;
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.intro-split {
    display: flex;
    gap: 3rem;
    align-items: center;
}

.intro-text {
    flex: 1;
}

.intro-visual {
    flex: 0 0 320px;
}

.premium-image {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border);
}

.section-block.visible {
    opacity: 1;
    transform: translateY(0);
}

.section-block h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--color-border);
    position: relative;
}

.section-block h2::after {
    content: '';
    position: absolute;
    bottom: -1px;
    left: 0;
    width: 80px;
    height: 3px;
    background-color: var(--color-gold);
}

.section-block h3 {
    font-size: 1.5rem;
    margin: 2.5rem 0 1rem;
    color: var(--color-text-dark);
}

.section-block p {
    margin-bottom: 1.5rem;
    text-align: justify;
}

.section-block p strong {
    color: var(--color-primary);
    font-weight: 700;
}

/* Lists */
.styled-list {
    list-style: none;
    margin-bottom: 2rem;
}

.styled-list li {
    position: relative;
    padding-left: 2rem;
    margin-bottom: 1rem;
    line-height: 1.7;
}

.styled-list li strong {
    color: var(--color-primary);
}

.styled-list li::before {
    content: '•';
    color: var(--color-gold);
    font-weight: bold;
    position: absolute;
    left: 0;
    font-size: 1.2rem;
    line-height: 1;
}

/* Vigilance Cards (Point de vigilance 2026) */
.vigilance-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-left: 4px solid var(--color-gold);
    margin: 2.5rem 0;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.vigilance-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.vigilance-header {
    background: var(--color-primary);
    color: white;
    padding: 1rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.year-2025 .vigilance-header, .year-2026 .vigilance-header {
    background: #1e293b;
}

.vigilance-header h4 {
    color: white;
    margin: 0;
    font-family: var(--font-body);
    font-weight: 600;
    font-size: 1.1rem;
}

.vigilance-body {
    padding: 1.5rem;
}

.vigilance-body p:last-child {
    margin-bottom: 0;
}

/* Comparative Block & Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin: 2rem 0;
}

.compare-card {
    background: var(--color-surface);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--color-border);
    transition: all 0.3s ease;
}

.compare-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-lg);
    border-color: var(--color-gold-light);
}

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid var(--color-border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.card-header h5 {
    margin: 0;
    font-size: 1.3rem;
    font-family: var(--font-body);
}

.badge {
    background: #f1f5f9;
    color: #475569;
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.badge-gold {
    background: var(--color-gold-light);
    color: var(--color-gold-hover);
}

.card-list {
    list-style: none;
    padding: 1.5rem;
}

.card-list li {
    margin-bottom: 1rem;
    font-size: 0.95rem;
    padding-bottom: 1rem;
    border-bottom: 1px dashed var(--color-border);
}

.card-list li:last-child {
    margin-bottom: 0;
    padding-bottom: 0;
    border-bottom: none;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin: 2rem 0;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-md);
}

.premium-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-surface);
}

.premium-table th {
    background: var(--color-primary);
    color: white;
    text-align: left;
    padding: 1.2rem;
    font-weight: 600;
    white-space: nowrap;
}

.premium-table td {
    padding: 1.2rem;
    border-bottom: 1px solid var(--color-border);
    color: var(--color-text-main);
}

.premium-table tbody tr:hover {
    background-color: #f8fafc;
}

.premium-table tbody tr:last-child td {
    border-bottom: none;
}

/* MySimul Banner Integration */
.simulation-banner {
    background: linear-gradient(135deg, var(--color-primary) 0%, #1e293b 100%);
    padding: 3.5rem 2.5rem;
    border-radius: var(--radius-lg);
    border-left: 5px solid var(--color-gold);
    color: white;
    text-align: center;
    box-shadow: var(--shadow-lg);
    margin: 3rem 0;
    position: relative;
    overflow: hidden;
}

.simulation-banner::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(197, 160, 89, 0.1) 0%, transparent 60%);
    z-index: 1;
}

.simulation-banner h3 {
    position: relative;
    color: white;
    font-size: 2rem;
    margin-top: 0;
    margin-bottom: 1rem;
    z-index: 2;
}

.simulation-banner p {
    position: relative;
    font-size: 1.15rem;
    color: #cbd5e1;
    max-width: 700px;
    margin: 0 auto 1rem;
    text-align: center;
    z-index: 2;
}

.simulation-banner .btn-primary, .simulation-banner .btn-outline {
    position: relative;
    z-index: 2;
}

/* Annex / Sources */
.annex {
    background: var(--color-surface);
    padding: 3rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border);
}

.sources-grid {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    margin-top: 2rem;
}

.source-card {
    padding-bottom: 2rem;
    border-bottom: 1px solid var(--color-border);
}

.source-card:last-child {
    border-bottom: none;
    padding-bottom: 0;
}

.source-card h3 {
    font-size: 1.2rem;
    color: var(--color-primary);
    margin-bottom: 1rem;
    font-family: var(--font-body);
}

.source-subgroup h4 {
    font-size: 1rem;
    color: #475569;
    margin: 1rem 0 0.5rem;
    font-family: var(--font-body);
}

.source-card ul {
    list-style: none;
    padding-left: 1rem;
}

.source-card li {
    position: relative;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    color: #64748b;
}

.source-card li::before {
    content: '-';
    position: absolute;
    left: -1rem;
    color: var(--color-gold);
}

.source-card li strong {
    color: var(--color-text-main);
}

/* Footer Professionnel */
.footer {
    background: #0f172a; /* Slate 900 for serious legal look */
    color: #94a3b8;
    padding: 4rem 2rem 2rem;
    margin-top: 6rem;
    border-top: 4px solid var(--color-gold);
}

.footer-content {
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-col h4 {
    color: white;
    font-size: 1.1rem;
    margin-bottom: 1.2rem;
}

.footer-col p {
    font-size: 0.9rem;
    line-height: 1.7;
    margin-bottom: 1rem;
}

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

.footer-links li {
    margin-bottom: 0.6rem;
}

.footer-links a {
    color: #94a3b8;
    font-size: 0.9rem;
}

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

.footer-disclaimer {
    grid-column: 1 / -1;
    background: rgba(255,255,255,0.03);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    border-left: 3px solid #ef4444; /* red indicator for disclaimer */
    font-size: 0.85rem;
    color: #64748b;
}

.footer-bottom {
    max-width: 1400px;
    margin: 0 auto;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.85rem;
}

/* Responsive Design */
@media (max-width: 1024px) {
    .container {
        flex-direction: column;
    }
    .intro-split {
        flex-direction: column;
    }
    .intro-visual {
        flex: auto;
        max-width: 400px;
        margin: 0 auto;
    }
    .sidebar {
        width: 100%;
        position: relative;
    }
    .sidebar-inner {
        position: static;
    }
    .hero-title {
        font-size: 2.8rem;
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    .nav-links {
        display: flex;
        flex-direction: column;
        align-items: flex-start;
        position: fixed;
        top: 0;
        right: 0;
        width: 80%;
        max-width: 320px;
        height: 100vh;
        background: white;
        box-shadow: -4px 0 30px rgba(0,0,0,0.15);
        padding: 6rem 2rem 2rem;
        gap: 0;
        z-index: 1050;
        transform: translateX(100%);
        transition: transform 0.35s cubic-bezier(0.4, 0, 0.2, 1);
        overflow-y: auto;
    }
    .nav-links.open {
        transform: translateX(0);
    }
    .nav-links li {
        width: 100%;
        border-bottom: 1px solid var(--color-border);
    }
    .nav-links a {
        display: block;
        padding: 1rem 0;
        font-size: 1rem;
        font-weight: 500;
    }
    .nav-links .btn-outline {
        border: none;
        padding: 1rem 0;
        border-radius: 0;
        color: var(--color-gold) !important;
    }
    /* Dark overlay behind the menu */
    .nav-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, 0.5);
        z-index: 1040;
        opacity: 0;
        transition: opacity 0.35s ease;
    }
    .nav-overlay.open {
        display: block;
        opacity: 1;
    }
    .hero {
        padding: 8rem 1rem 5rem;
    }
    .hero-title {
        font-size: 2.2rem;
    }
    .annex {
        padding: 1.5rem;
    }
}

/* --- Section Bon pour Étude --- */
.bon-container {
    padding: 2rem 0;
    margin-top: 2rem;
}

.bon-certificate {
    background: var(--color-surface);
    border: 2px dashed var(--color-gold);
    padding: 4rem 3rem;
    border-radius: var(--radius-lg);
    position: relative;
    box-shadow: var(--shadow-lg);
    background-image: linear-gradient(rgba(197, 160, 89, 0.03) 1px, transparent 1px),
                      linear-gradient(90deg, rgba(197, 160, 89, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    overflow: hidden;
}

.bon-header {
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    z-index: 2;
}

.bon-title {
    font-size: 2.2rem !important;
    margin: 0.5rem 0 !important;
    font-family: var(--font-heading);
    color: var(--color-primary);
}

.bon-subtitle {
    text-transform: uppercase;
    letter-spacing: 3px;
    font-size: 0.85rem;
    color: var(--color-gold);
    font-weight: 700;
    font-family: var(--font-body);
}

.bon-form {
    max-width: 650px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
}

.bon-form .form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
}

.bon-form .form-group {
    margin-bottom: 1.5rem;
    text-align: left;
}

.bon-form label {
    display: block;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--color-primary);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 0.5rem;
}

.bon-form input, .bon-form select {
    width: 100%;
    padding: 1rem 1.2rem;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: #f8fafc;
    font-family: var(--font-body);
    font-size: 0.95rem;
    color: var(--color-text-main);
    transition: all 0.3s ease;
}

.bon-form input:focus, .bon-form select:focus {
    outline: none;
    border-color: var(--color-gold);
    background: var(--color-surface);
    box-shadow: 0 0 0 3px var(--color-gold-light);
}

.form-footer {
    text-align: center;
    margin-top: 2.5rem;
}

.legal-mention {
    font-size: 0.8rem;
    color: #94a3b8;
    margin-bottom: 1.5rem;
    font-style: italic;
}

.bon-seal {
    position: absolute;
    bottom: -20px;
    right: -20px;
    width: 140px;
    height: 140px;
    border: 2px double var(--color-gold);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transform: rotate(-15deg);
    opacity: 0.15;
    pointer-events: none;
}

.seal-text {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-gold);
    text-transform: uppercase;
    text-align: center;
    font-family: var(--font-heading);
    line-height: 1.2;
}

@media (max-width: 768px) {
    .bon-form .form-row { grid-template-columns: 1fr; gap: 0; }
    .bon-certificate { padding: 2.5rem 1.5rem; }
    .bon-title { font-size: 1.8rem !important; }
}