/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --color-primary: #0071e3;
    --color-primary-dark: #0051a5;
    --color-text: #1d1d1f;
    --color-text-light: #86868b;
    --color-bg: #ffffff;
    --color-bg-light: #f5f5f7;
    --color-border: rgba(0, 0, 0, 0.1);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--color-text);
    background-color: var(--color-bg);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ============================================
   NAVIGATION
   ============================================ */
nav {
    position: fixed;
    top: 0;
    width: 100%;
    background-color: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
    -webkit-backdrop-filter: saturate(180%) blur(20px);
    border-bottom: 1px solid var(--color-border);
    z-index: 1000;
    padding: 0 22px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-size: 20px;
    font-weight: 600;
    color: var(--color-text);
    text-decoration: none;
    letter-spacing: -0.01em;
    transition: var(--transition);
}

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

.logo-mark {
    color: var(--color-text);
}

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

.nav-links {
    display: flex;
    gap: 40px;
    list-style: none;
    align-items: center;
}

.nav-links a {
    color: var(--color-text);
    text-decoration: none;
    font-size: 14px;
    font-weight: 400;
    transition: var(--transition);
    position: relative;
}

.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--color-primary);
    transition: var(--transition);
}

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

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

.mobile-menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--color-text);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
    margin-top: 60px;
    min-height: calc(85vh - 60px);
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 80px 22px 40px;
    background: linear-gradient(to bottom, var(--color-bg-light) 0%, var(--color-bg) 100%);
}

.hero-content {
    max-width: 980px;
    animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
    font-size: 64px;
    font-weight: 600;
    letter-spacing: -0.005em;
    margin-bottom: 20px;
    line-height: 1.07143;
    color: var(--color-text);
}

.hero p {
    font-size: 28px;
    font-weight: 400;
    color: var(--color-text-light);
    margin-bottom: 40px;
    line-height: 1.5;
}

.hero .btn {
    display: inline-block;
    padding: 14px 32px;
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 17px;
    font-weight: 400;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.hero .btn:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 10px 25px rgba(0, 113, 227, 0.3);
}

/* ============================================
   SECTIONS
   ============================================ */
.section {
    padding: 100px 22px;
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    font-size: 48px;
    font-weight: 600;
    letter-spacing: -0.003em;
    margin-bottom: 20px;
    line-height: 1.08349;
    text-align: center;
}

.section-subtitle {
    font-size: 21px;
    font-weight: 400;
    color: var(--color-text-light);
    text-align: center;
    margin-bottom: 60px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.section-content {
    font-size: 19px;
    font-weight: 400;
    color: var(--color-text);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

.section-content p {
    margin-bottom: 20px;
}

/* ============================================
   STEPS CONTAINER (Comment ça marche)
   ============================================ */
.steps-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px;
    max-width: 1100px;
    margin: 80px auto 0;
    padding: 0 22px;
}

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

.step-link-wrapper {
    text-align: center;
    margin-top: 20px;
}

.step-link-wrapper a {
    display: inline-block !important;
    text-align: center !important;
    margin-left: auto !important;
    margin-right: auto !important;
}

/* ============================================
   ABOUT ME SECTION (Qui suis-je)
   ============================================ */
.about-me-container {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 60px;
    align-items: start;
}

.about-me-title {
    text-align: left;
    margin-bottom: 40px;
}

/* ============================================
   CARDS & GRID
   ============================================ */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 40px;
    transition: var(--transition);
    text-align: center;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
    border-color: var(--color-primary);
}

.card-icon {
    font-size: 48px;
    margin-bottom: 20px;
}

.card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-text);
}

.card p {
    font-size: 17px;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* ============================================
   ARTICLES
   ============================================ */
.articles-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 60px;
}

.article-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    overflow: hidden;
    transition: var(--transition);
    text-decoration: none;
    color: inherit;
    display: block;
}

.article-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.article-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 48px;
}

.article-content {
    padding: 30px;
}

.article-date {
    font-size: 14px;
    color: var(--color-text-light);
    margin-bottom: 10px;
}

.article-card h3 {
    font-size: 24px;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--color-text);
}

.article-card p {
    font-size: 17px;
    color: var(--color-text-light);
    line-height: 1.5;
}

/* ============================================
   ARTICLE TEMPLATE
   ============================================ */
.article-header {
    margin-top: 60px;
    padding: 60px 22px;
    text-align: center;
    background: var(--color-bg-light);
}

.article-header h1 {
    font-size: 48px;
    font-weight: 600;
    margin-bottom: 15px;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.article-meta {
    font-size: 16px;
    color: var(--color-text-light);
    margin-top: 20px;
}

.article-body {
    max-width: 800px;
    margin: 60px auto;
    padding: 0 22px;
}

.article-body h2 {
    font-size: 32px;
    font-weight: 600;
    margin-top: 40px;
    margin-bottom: 20px;
}

.article-body h3 {
    font-size: 24px;
    font-weight: 600;
    margin-top: 30px;
    margin-bottom: 15px;
}

.article-body p {
    font-size: 19px;
    line-height: 1.8;
    margin-bottom: 20px;
    color: var(--color-text);
}

.article-body ul,
.article-body ol {
    margin-left: 30px;
    margin-bottom: 20px;
    font-size: 19px;
    line-height: 1.8;
}

.article-body li {
    margin-bottom: 10px;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-block;
    padding: 12px 28px;
    background-color: var(--color-primary);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-size: 16px;
    font-weight: 400;
    transition: var(--transition);
    border: none;
    cursor: pointer;
}

.btn:hover {
    background-color: var(--color-primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 113, 227, 0.3);
}

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

.btn-secondary:hover {
    background-color: var(--color-primary);
    color: white;
}

/* ============================================
   FOOTER
   ============================================ */
footer {
    background: linear-gradient(to bottom, var(--color-bg) 0%, var(--color-bg-light) 100%);
    padding: 50px 22px 30px;
    border-top: 1px solid var(--color-border);
    margin-top: 100px;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
}

.footer-trust {
    text-align: center;
    padding: 20px 0;
    margin-bottom: 30px;
    border-bottom: 1px solid var(--color-border);
}

.footer-trust p {
    font-size: 14px;
    color: var(--color-text-light);
    line-height: 1.6;
    max-width: 700px;
    margin: 0 auto;
}

.footer-trust strong {
    color: var(--color-text);
    font-weight: 600;
}

.footer-content {
    display: flex;
    justify-content: center;
    gap: 80px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

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

.footer-column h3 {
    font-size: 13px;
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 15px;
    letter-spacing: 0.01em;
    text-transform: uppercase;
}

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

.footer-column ul li {
    margin-bottom: 8px;
}

.footer-column a {
    color: var(--color-text-light);
    text-decoration: none;
    font-size: 14px;
    transition: var(--transition);
    display: inline-block;
}

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

.footer-bottom {
    padding-top: 20px;
    border-top: 1px solid var(--color-border);
    text-align: center;
}

.footer-bottom p {
    font-size: 13px;
    color: var(--color-text-light);
    margin: 0;
}

.footer-links {
    display: none;
}

/* ============================================
   SIMULATEUR PAGE
   ============================================ */
.simulator-container {
    max-width: 1400px;
    margin: 100px auto 0;
    padding: 0 22px;
}

.simulator-box {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 50px 40px;
    text-align: center;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.simulator-box:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 50px rgba(0, 0, 0, 0.1);
}

.simulator-box h2 {
    font-size: 36px;
    font-weight: 600;
    margin-bottom: 20px;
}

.simulator-box p {
    font-size: 19px;
    color: var(--color-text-light);
    margin-bottom: 40px;
    line-height: 1.6;
}

.excel-preview {
    background: var(--color-bg-light);
    border: 2px dashed var(--color-border);
    border-radius: 8px;
    padding: 40px;
    margin: 40px 0;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-light);
}

/* ============================================
   COMPARISON TABLE
   ============================================ */
.comparison-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--color-bg);
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.comparison-table thead {
    background: var(--color-bg-light);
}

.comparison-table th {
    padding: 20px;
    font-size: 16px;
    font-weight: 600;
    color: var(--color-text);
    border-bottom: 2px solid var(--color-border);
}

.comparison-table td {
    padding: 18px 20px;
    font-size: 16px;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

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

.comparison-table tbody tr:hover {
    background-color: var(--color-bg-light);
}

/* ============================================
   DOWNLOAD SECTION
   ============================================ */
.download-section {
    padding: 100px 22px;
    text-align: center;
}

.download-buttons {
    display: flex;
    gap: 30px;
    justify-content: center;
    align-items: center;
    margin-top: 60px;
    flex-wrap: wrap;
}

.btn-download-free {
    padding: 16px 40px;
    font-size: 17px;
    font-weight: 400;
    background-color: var(--color-bg);
    color: var(--color-text);
    border: 2px solid var(--color-border);
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    display: inline-block;
}

.btn-download-free:hover {
    border-color: var(--color-primary);
    color: var(--color-primary);
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.btn-download-premium {
    padding: 18px 50px;
    font-size: 18px;
    font-weight: 500;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
    color: white;
    border: none;
    text-decoration: none;
    border-radius: 8px;
    transition: var(--transition);
    display: inline-block;
    box-shadow: 0 5px 20px rgba(0, 113, 227, 0.3);
}

.btn-download-premium:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 113, 227, 0.4);
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 100%);
}

/* ============================================
   SIMULATOR VERSIONS GRID
   ============================================ */
.simulator-versions-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fade-in {
    animation: fadeInUp 0.6s ease-out;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute;
        top: 60px;
        left: 0;
        width: 100%;
        background-color: rgba(255, 255, 255, 0.95);
        backdrop-filter: saturate(180%) blur(20px);
        flex-direction: column;
        padding: 20px;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
    }

    .nav-links.active {
        display: flex;
    }

    .mobile-menu-toggle {
        display: block;
    }

    .hero h1 {
        font-size: 40px;
    }

    .hero p {
        font-size: 21px;
    }

    .section-title {
        font-size: 36px;
    }

    .section-subtitle {
        font-size: 19px;
    }

    .cards-grid,
    .articles-grid {
        grid-template-columns: 1fr;
    }

    .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
    }

    .simulator-box {
        padding: 40px 30px;
    }

    /* Simulateur versions - Responsive */
    .simulator-versions-grid {
        grid-template-columns: 1fr !important;
        gap: 30px !important;
    }

    .comparison-table {
        font-size: 14px;
    }

    .comparison-table th,
    .comparison-table td {
        padding: 12px 15px;
        font-size: 14px;
    }

    /* Section Comment ça marche - Responsive */
    .steps-container {
        grid-template-columns: 1fr !important;
        gap: 50px !important;
        margin-top: 50px !important;
    }

    /* Section Qui suis-je - Responsive */
    .about-me-container {
        grid-template-columns: 1fr !important;
        gap: 40px !important;
    }

    .about-me-title {
        text-align: center !important;
    }

    /* Download section - Responsive */
    .download-buttons {
        flex-direction: column;
        gap: 20px;
    }

    .btn-download-free,
    .btn-download-premium {
        width: 100%;
        max-width: 400px;
    }

    /* Footer responsive */
    .footer-content {
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 30px !important;
    }

    .footer-trust {
        padding: 20px 0 !important;
        margin-bottom: 30px !important;
    }

    .footer-trust p {
        font-size: 14px !important;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 32px;
    }

    .hero p {
        font-size: 18px;
    }

    .section {
        padding: 60px 22px;
    }
}

/* ============================================
   FREE DOWNLOAD FORM
   ============================================ */
.free-download-form {
    margin-top: 2rem;
}

.free-download-row {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
    justify-content: center;
}

.free-download-row input[type="email"] {
    flex: 1 1 280px;
    min-width: 0;
    max-width: 350px;
    padding: 14px 20px;
    border: 1px solid var(--color-border);
    border-radius: 8px;
    font-size: 16px;
    font-family: inherit;
    transition: var(--transition);
}

.free-download-row input[type="email"]:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.1);
}

.free-download-row input[type="email"]::placeholder {
    color: var(--color-text-light);
}

.form-helper {
    margin-top: 1rem;
    font-size: 0.95rem;
    color: var(--color-text-light);
    min-height: 1.5em;
}

.form-helper.error {
    color: #d9534f;
}

.form-helper.success {
    color: #28a745;
}

/* Screen reader only (accessibilité) */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

@media (max-width: 600px) {
    .free-download-row {
        flex-direction: column;
        align-items: center;
    }

    .free-download-row input[type="email"] {
        width: 100%;
        max-width: 100%;
    }

    .free-download-row .btn {
        width: 100%;
    }
}