/* ===== Variables ===== */
:root {
    --color-bg: #faf9f6;
    --color-bg-alt: #f0ede8;
    --color-primary: #1a365d;
    --color-primary-light: #2c5282;
    --color-accent: #b8860b;
    --color-accent-hover: #8b6914;
    --color-text: #2d3748;
    --color-text-muted: #718096;
    --color-white: #fff;
    --font-heading: 'Cormorant Garamond', Georgia, serif;
    --font-body: 'Source Sans 3', -apple-system, sans-serif;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
    --shadow: 0 4px 20px rgba(0,0,0,0.08);
    --shadow-md: 0 8px 30px rgba(0,0,0,0.1);
    --radius: 10px;
    --radius-sm: 6px;
    --header-height: 72px;
    --transition: 0.25s ease;
}

/* ===== Reset & base ===== */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    margin: 0;
    font-family: var(--font-body);
    font-size: 1rem;
    line-height: 1.65;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(26, 54, 93, 0.08);
    box-shadow: 0 1px 0 rgba(255,255,255,0.6);
    transition: background var(--transition), box-shadow var(--transition);
}
.header-inner {
    max-width: 1140px;
    margin: 0 auto;
    padding: 0 1.75rem;
    height: var(--header-height);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
}
.logo {
    font-family: var(--font-heading);
    font-size: 1.55rem;
    font-weight: 600;
    color: var(--color-primary);
    text-decoration: none;
    letter-spacing: 0.02em;
    transition: color var(--transition), opacity var(--transition);
}
.logo:hover {
    color: var(--color-primary-light);
    opacity: 0.95;
}
.main-nav {
    display: flex;
    gap: 0.15rem;
    align-items: center;
}
.main-nav a {
    padding: 0.5rem 0.85rem;
    color: var(--color-text);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    border-radius: var(--radius-sm);
    transition: color var(--transition), background var(--transition);
    position: relative;
}
.main-nav a::after {
    content: '';
    position: absolute;
    left: 0.85rem;
    right: 0.85rem;
    bottom: 0.35rem;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition);
    border-radius: 1px;
}
.main-nav a:hover {
    color: var(--color-primary);
    background: rgba(26, 54, 93, 0.04);
}
.main-nav a:hover::after { transform: scaleX(1); }
.main-nav a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 2px;
}
.nav-toggle {
    display: none;
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-bg-alt);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%231a365d' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M4 6h16M4 12h16M4 18h16'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 22px;
    cursor: pointer;
    transition: background-color var(--transition);
}
.nav-toggle:hover { background-color: rgba(26, 54, 93, 0.08); }
body.menu-open .nav-toggle {
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%231a365d' stroke-width='2'%3E%3Cpath d='M6 18L18 6M6 6l12 12'/%3E%3C/svg%3E");
}

/* ===== Hero ===== */
.hero {
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(145deg, var(--color-primary) 0%, var(--color-primary-light) 50%, #234e76 100%);
    color: var(--color-white);
    text-align: center;
    padding: 3rem 1.5rem;
}
.hero-content { max-width: 620px; }
.hero h1 {
    font-family: var(--font-heading);
    font-size: clamp(2.5rem, 6vw, 4rem);
    font-weight: 600;
    margin: 0 0 0.25rem;
    letter-spacing: 0.03em;
    line-height: 1.1;
}
.hero-subtitle {
    font-size: 1.3rem;
    opacity: 0.95;
    margin: 0 0 0.5rem;
    letter-spacing: 0.02em;
}
.hero-tagline {
    font-size: 1.05rem;
    opacity: 0.88;
    margin: 0 0 2rem;
}
.hero-actions {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    justify-content: center;
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 0.8rem 1.6rem;
    font-family: var(--font-body);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius);
    transition: background var(--transition), color var(--transition), box-shadow var(--transition), border-color var(--transition), transform var(--transition);
}
.btn:focus-visible { outline: 2px solid currentColor; outline-offset: 2px; }
.btn-primary {
    background: var(--color-accent);
    color: var(--color-white);
}
.btn-primary:hover {
    background: var(--color-accent-hover);
    box-shadow: var(--shadow);
    transform: translateY(-1px);
}
.btn-outline {
    background: transparent;
    color: var(--color-white);
    border: 2px solid rgba(255,255,255,0.75);
}
.btn-outline:hover {
    background: rgba(255,255,255,0.12);
    border-color: rgba(255,255,255,0.9);
}

/* ===== Sections ===== */
.section {
    padding: 4.5rem 0;
}
.section-alt { background: var(--color-bg-alt); }
.container {
    max-width: 860px;
    margin: 0 auto;
    padding: 0 1.75rem;
}
.section-title {
    font-family: var(--font-heading);
    font-size: 2rem;
    font-weight: 600;
    color: var(--color-primary);
    margin: 0 0 1rem;
    letter-spacing: 0.01em;
    line-height: 1.25;
}
.section-intro {
    color: var(--color-text-muted);
    margin: 0 0 2rem;
    font-size: 1.05rem;
}
.prose p { margin: 0 0 1rem; }
.prose p:last-child { margin-bottom: 0; }
.text-muted { color: var(--color-text-muted); font-size: 0.95rem; }
.teaching-topics {
    list-style: none;
    padding: 0;
    margin: 0 0 1.5rem;
}
.teaching-topics li {
    padding: 0.35rem 0;
    padding-left: 1.25rem;
    position: relative;
}
.teaching-topics li::before {
    content: '·';
    position: absolute;
    left: 0;
    color: var(--color-accent);
    font-weight: bold;
}
/* ===== Course cards ===== */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}
.course-card {
    background: var(--color-white);
    padding: 1.6rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition), border-color var(--transition);
    border: 1px solid transparent;
}
.course-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-3px);
    border-color: rgba(26, 54, 93, 0.08);
}
.course-card h3 {
    font-family: var(--font-heading);
    font-size: 1.35rem;
    color: var(--color-primary);
    margin: 0 0 0.5rem;
    letter-spacing: 0.01em;
}
.course-card p {
    margin: 0 0 1rem;
    color: var(--color-text-muted);
    font-size: 0.95rem;
}
.course-link {
    font-weight: 600;
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}
.course-link:hover { color: var(--color-accent-hover); }

/* ===== Resources ===== */
.resources-list { display: flex; flex-direction: column; gap: 1rem; }
.resource-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.35rem;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}
.resource-item:hover { box-shadow: var(--shadow); }
.resource-icon { font-size: 1.5rem; }
.resource-item strong { display: block; margin-bottom: 0.25rem; color: var(--color-primary); }
.resource-item p { margin: 0; color: var(--color-text-muted); font-size: 0.95rem; }
.resource-item a { color: var(--color-accent); text-decoration: none; }
.resource-item a:hover { text-decoration: underline; }

/* ===== Contact ===== */
.section-contact { padding-bottom: 4rem; }
.contact-block {
    background: var(--color-white);
    padding: 2rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition);
}
.contact-block:hover { box-shadow: var(--shadow); }
.contact-block p { margin: 0 0 0.75rem; }
.contact-block a { color: var(--color-accent); text-decoration: none; }
.contact-block a:hover { text-decoration: underline; }

/* ===== Footer ===== */
.site-footer {
    background: var(--color-primary);
    color: rgba(255,255,255,0.92);
    text-align: center;
    padding: 2rem 1.5rem;
    font-size: 0.95rem;
}
.site-footer p { margin: 0; }

/* ===== Course page template style (used in cours/*.html) ===== */
.content-block { margin-bottom: 1.5rem; }

/* ===== Theme toggle (dark mode) ===== */
.theme-toggle {
    width: 44px;
    height: 44px;
    border: none;
    border-radius: var(--radius-sm);
    background: var(--color-bg-alt);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%231a365d' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M20.354 15.354A9 9 0 018.646 3.646 9.003 9.003 0 0012 21a9.003 9.003 0 008.354-5.646z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 22px;
    cursor: pointer;
    margin-left: 0.25rem;
    transition: background-color var(--transition);
}
.theme-toggle:hover { background-color: rgba(26, 54, 93, 0.08); }
.theme-toggle:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
body.dark .theme-toggle {
    background: rgba(255,255,255,0.06);
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23e8eaed' stroke-width='2' stroke-linecap='round'%3E%3Cpath d='M12 3v1m0 16v1m9-9h-1M4 12H3m15.364 6.364l-.707-.707M6.343 6.343l-.707-.707m12.728 0l-.707.707M6.343 17.657l-.707.707M16 12a4 4 0 11-8 0 4 4 0 018 0z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: center;
    background-size: 22px;
}
body.dark .theme-toggle:hover { background-color: rgba(255,255,255,0.1); }

/* ===== Dark mode ===== */
body.dark {
    --color-bg: #1a1d23;
    --color-bg-alt: #252830;
    --color-primary: #7eb8da;
    --color-primary-light: #9ec9e8;
    --color-accent: #d4a84b;
    --color-accent-hover: #e4bc6a;
    --color-text: #e8eaed;
    --color-text-muted: #9aa0a6;
    --color-white: #252830;
    --color-bg-card: #252830;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
    --shadow: 0 4px 12px rgba(0,0,0,0.4);
}
body.dark .site-header {
    background: rgba(37, 40, 48, 0.95);
    border-bottom-color: rgba(255,255,255,0.06);
    box-shadow: 0 1px 0 rgba(0,0,0,0.2);
}
body.dark .main-nav a { color: var(--color-text); }
body.dark .main-nav a:hover { background: rgba(255,255,255,0.06); color: var(--color-primary); }
body.dark .main-nav a::after { background: var(--color-accent); }
body.dark .course-card,
body.dark .resource-item,
body.dark .contact-block { background: var(--color-bg-card); }
body.dark .site-footer { background: #15171c; }

/* ===== Cours particuliers preview ===== */
.particuliers-preview {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.5rem;
}
.particuliers-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1rem;
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
}
.pill {
    display: inline-block;
    padding: 0.2em 0.6em;
    font-size: 0.8rem;
    font-weight: 600;
    background: var(--color-accent);
    color: var(--color-white);
    border-radius: 999px;
}
.btn-outline-dark {
    background: transparent;
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}
.btn-outline-dark:hover { background: rgba(44, 82, 130, 0.1); }
body.dark .btn-outline-dark { color: var(--color-primary-light); border-color: var(--color-primary-light); }
body.dark .btn-outline-dark:hover { background: rgba(126, 184, 218, 0.15); }

/* ===== Actualités ===== */
.text-center { text-align: center; }
.news-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 1.5rem;
}
.news-card {
    background: var(--color-white);
    padding: 1.6rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    transition: box-shadow var(--transition), transform var(--transition);
}
.news-card:hover {
    box-shadow: var(--shadow);
    transform: translateY(-2px);
}
.news-date { font-size: 0.85rem; color: var(--color-accent); font-weight: 600; display: block; margin-bottom: 0.5rem; }
.news-card h3 { font-size: 1.1rem; color: var(--color-primary); margin: 0 0 0.5rem; }
.news-card p { margin: 0; color: var(--color-text-muted); font-size: 0.95rem; }

/* ===== Témoignages ===== */
.testimonials { display: flex; flex-direction: column; gap: 1.5rem; }
.testimonial {
    background: var(--color-white);
    padding: 1.6rem;
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    border-left: 4px solid var(--color-accent);
    margin: 0;
    transition: box-shadow var(--transition);
}
.testimonial:hover { box-shadow: var(--shadow); }
.testimonial p { margin: 0 0 0.5rem; font-style: italic; }
.testimonial cite { font-size: 0.9rem; color: var(--color-text-muted); font-style: normal; }

/* ===== FAQ ===== */
.faq-list { max-width: 640px; }
.faq-item {
    background: var(--color-white);
    border-radius: var(--radius);
    box-shadow: var(--shadow-sm);
    margin-bottom: 0.75rem;
    overflow: hidden;
    transition: box-shadow var(--transition);
}
.faq-item:hover,
.faq-item[open] { box-shadow: var(--shadow); }
.faq-item summary {
    padding: 1rem 1.25rem;
    font-weight: 600;
    cursor: pointer;
    list-style: none;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; font-size: 1.25rem; color: var(--color-accent); }
.faq-item[open] summary::after { content: '−'; }
.faq-item p {
    padding: 0 1.25rem 1rem;
    margin: 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    border-top: 1px solid var(--color-bg-alt);
    padding-top: 0.75rem;
    margin-top: 0;
}
.faq-item a { color: var(--color-accent); }

/* ===== Newsletter ===== */
.container-narrow { max-width: 480px; }
.newsletter-form {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}
.newsletter-form input {
    flex: 1;
    min-width: 200px;
    padding: 0.75rem 1rem;
    border: 1px solid var(--color-bg-alt);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 1rem;
}
body.dark .newsletter-form input { background: var(--color-bg); border-color: var(--color-text-muted); color: var(--color-text); }
.form-note { font-size: 0.85rem; color: var(--color-text-muted); margin: 0.5rem 0 0; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* ===== Contact form ===== */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    align-items: start;
}
.contact-form-block h3,
.contact-block h3 { margin: 0 0 1rem; font-size: 1.1rem; color: var(--color-primary); }
.contact-form label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: 500;
    font-size: 0.9rem;
}
.contact-form input,
.contact-form textarea {
    width: 100%;
    padding: 0.6rem 0.75rem;
    margin-bottom: 1rem;
    border: 1px solid var(--color-bg-alt);
    border-radius: var(--radius);
    font-family: var(--font-body);
    font-size: 1rem;
}
body.dark .contact-form input,
body.dark .contact-form textarea { background: var(--color-bg); border-color: var(--color-text-muted); color: var(--color-text); }
.contact-form textarea { resize: vertical; min-height: 100px; }
.contact-form-status {
    margin: 0 0 1rem;
    font-size: 0.95rem;
    min-height: 1.4em;
}
.contact-form-status--success { color: #0d8050; font-weight: 500; }
.contact-form-status--sending { color: var(--color-text-muted); }
.contact-form-status--error { color: #c53030; }
.social-links { margin-top: 1rem; }
.social-link {
    display: inline-block;
    padding: 0.4rem 0.8rem;
    background: var(--color-primary);
    color: var(--color-white);
    text-decoration: none;
    border-radius: var(--radius);
    font-size: 0.9rem;
    font-weight: 500;
}
.social-link:hover { background: var(--color-primary-light); }

/* ===== Back to top ===== */
.back-to-top {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background: var(--color-primary);
    color: var(--color-white);
    font-size: 1.35rem;
    cursor: pointer;
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), visibility var(--transition), transform var(--transition), box-shadow var(--transition);
    z-index: 50;
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}
.back-to-top:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }

/* ===== Footer links ===== */
.footer-inner { display: flex; flex-direction: column; gap: 0.5rem; }
.footer-links { margin: 0; display: flex; flex-wrap: wrap; gap: 1rem; justify-content: center; }
.footer-links a { color: rgba(255,255,255,0.9); text-decoration: none; }
.footer-links a:hover { text-decoration: underline; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
    .main-nav a { padding: 0.45rem 0.65rem; font-size: 0.9rem; }
    .main-nav a::after { left: 0.65rem; right: 0.65rem; }
}
@media (max-width: 768px) {
    .header-inner { padding: 0 1.25rem; }
    .nav-toggle { display: flex; align-items: center; justify-content: center; }
    .main-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: var(--color-white);
        flex-direction: column;
        justify-content: center;
        padding: var(--header-height) 1.5rem 2rem;
        gap: 0;
        box-shadow: none;
        display: none;
        overflow-y: auto;
    }
    .main-nav.is-open {
        display: flex;
        animation: navFadeIn 0.25s ease;
    }
    .main-nav a {
        padding: 1rem 1.25rem;
        font-size: 1.1rem;
        border-radius: var(--radius);
        text-align: center;
    }
    .main-nav a::after { display: none; }
    body.dark .main-nav { background: var(--color-bg); }
    .hero { min-height: 60vh; padding: 2rem 1rem; }
    .section { padding: 3rem 0; }
    .contact-layout { grid-template-columns: 1fr; }
}
@keyframes navFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}
body.menu-open { overflow: hidden; }