/* ═══════════════════════════════════════
   RESET & VARIABLES
═══════════════════════════════════════ */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
    --noir: #0a0a0a;
    --blanc: #fafaf8;
    --creme: #f5f0e8;
    --rouge: #c0392b;
    --rouge-doux: #e74c3c;
    --rouge-sombre: #922b21;
    --vert: #1a5c38;
    --vert-clair: #27ae60;
    --gris: #6b7280;
    --gris-clair: #e5e5e5;
    --basque-rouge: #d63031;
    --basque-vert: #00695c;
    --or: #d4a853;
    --ombre: 0 4px 30px rgba(0,0,0,0.08);
    --ombre-forte: 0 20px 60px rgba(0,0,0,0.12);
    --radius: 16px;
    --radius-sm: 10px;
    --transition: 0.4s cubic-bezier(0.25, 0.46, 0.45, 0.94);

    /* Article theme (default: green / basque-vert) — override per article */
    --article-accent: var(--basque-vert);
    --article-accent-bg: rgba(0,105,92,0.06);
    --article-accent-pill: rgba(0,105,92,0.12);
    --article-hero-gradient: linear-gradient(135deg, #f0fffe 0%, #c8f0ec 50%, #a8e4df 100%);
    --article-hero-glow: rgba(0,105,92,0.1);
    --cta-gradient: linear-gradient(135deg, var(--basque-vert) 0%, #004d44 100%);
    --cta-btn-color: var(--basque-vert);
}

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

body {
    font-family: 'DM Sans', sans-serif;
    background: var(--blanc);
    color: var(--noir);
    line-height: 1.7;
    overflow-x: hidden;
}

/* ═══════════════════════════════════════
   NAVBAR
═══════════════════════════════════════ */
nav {
    position: fixed; top: 0; width: 100%; z-index: 1000;
    padding: 1rem 2rem; transition: var(--transition);
    background: rgba(255,255,255,0.92);
    backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 1px 30px rgba(0,0,0,0.06);
}
nav .nav-inner {
    max-width: 1200px; margin: 0 auto;
    display: flex; align-items: center; justify-content: space-between;
}
nav .logo {
    font-family: 'Playfair Display', serif; font-size: 1.5rem;
    font-weight: 700; color: var(--noir); text-decoration: none; letter-spacing: -0.02em;
}
nav .logo span { color: var(--basque-rouge); }
nav .nav-links {
    display: flex; gap: 2rem; list-style: none; align-items: center;
}
nav .nav-links a {
    text-decoration: none; color: var(--noir); font-size: 0.9rem;
    font-weight: 500; letter-spacing: 0.02em; transition: var(--transition);
    position: relative;
}
nav .nav-links a::after {
    content: ''; position: absolute; bottom: -4px; left: 0;
    width: 0; height: 2px; background: var(--basque-rouge); transition: var(--transition);
}
nav .nav-links a:hover::after { width: 100%; }
nav .nav-links a.active::after { width: 100%; }
nav .nav-cta {
    background: var(--basque-rouge); color: white !important;
    padding: 0.6rem 1.4rem; border-radius: 50px;
    font-weight: 600; font-size: 0.85rem; transition: var(--transition);
}
nav .nav-cta::after { display: none !important; }
nav .nav-cta:hover { background: var(--rouge-sombre); transform: translateY(-1px); }

/* ═══════════════════════════════════════
   ARTICLE HERO
═══════════════════════════════════════ */
.article-hero {
    min-height: 52vh;
    display: flex; flex-direction: column;
    align-items: center; justify-content: flex-end;
    padding: 9rem 2rem 4rem;
    background: var(--article-hero-gradient);
    position: relative; overflow: hidden; text-align: center;
}
.article-hero::before {
    content: ''; position: absolute; top: -20%; right: -10%;
    width: 600px; height: 600px;
    background: radial-gradient(circle, var(--article-hero-glow) 0%, transparent 70%);
    border-radius: 50%;
}
.article-hero::after {
    content: ''; position: absolute; bottom: -10%; left: -5%;
    width: 400px; height: 400px;
    background: radial-gradient(circle, rgba(214,48,49,0.06) 0%, transparent 70%);
    border-radius: 50%;
}
.article-hero-inner { position: relative; z-index: 2; max-width: 780px; }

.article-breadcrumb {
    display: flex; align-items: center; justify-content: center;
    gap: 0.5rem; margin-bottom: 1.5rem;
    font-size: 0.82rem; color: var(--gris);
}
.article-breadcrumb a {
    color: var(--gris); text-decoration: none; transition: var(--transition);
}
.article-breadcrumb a:hover { color: var(--article-accent); }
.article-breadcrumb span { opacity: 0.5; }

.article-hero-meta {
    display: flex; align-items: center; justify-content: center;
    gap: 1rem; margin-bottom: 1.5rem; flex-wrap: wrap;
}
.article-cat-pill {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: var(--article-accent-pill); color: var(--article-accent);
    padding: 0.4rem 1rem; border-radius: 50px;
    font-size: 0.8rem; font-weight: 700; letter-spacing: 0.06em; text-transform: uppercase;
}
.article-reading-pill {
    display: inline-flex; align-items: center; gap: 0.4rem;
    background: rgba(0,0,0,0.06); color: var(--gris);
    padding: 0.4rem 1rem; border-radius: 50px;
    font-size: 0.8rem; font-weight: 500;
}

.article-hero h1 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(2rem, 4.5vw, 3.2rem); font-weight: 700;
    line-height: 1.15; letter-spacing: -0.03em;
    margin-bottom: 1.2rem; color: var(--noir);
}
.article-hero h1 em { font-style: italic; color: var(--article-accent); }

.article-date-pub { font-size: 0.82rem; color: var(--gris); }

/* ═══════════════════════════════════════
   ARTICLE LAYOUT
═══════════════════════════════════════ */
.article-wrap {
    max-width: 780px; margin: 0 auto;
    padding: 4rem 2rem 5rem;
}

/* Introduction encadrée */
.article-intro {
    background: var(--article-accent-bg);
    border-left: 4px solid var(--article-accent);
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    padding: 1.8rem 2rem;
    margin-bottom: 3rem;
    font-size: 1.05rem;
    line-height: 1.75;
}
.article-intro strong { color: var(--article-accent); font-weight: 600; }

/* Headings */
.article-wrap h2 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    font-weight: 700; letter-spacing: -0.02em;
    color: var(--noir); margin: 3rem 0 1rem;
    padding-bottom: 0.6rem;
    border-bottom: 2px solid var(--gris-clair);
}
.article-wrap h3 {
    font-size: 1.05rem; font-weight: 700;
    color: var(--article-accent); margin: 2rem 0 0.8rem;
    display: flex; align-items: center; gap: 0.5rem;
}
.article-wrap h3::before {
    content: ''; display: inline-block;
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--article-accent); flex-shrink: 0;
}

/* Paragraphes & listes */
.article-wrap p { margin-bottom: 1.2rem; font-size: 1rem; color: var(--noir); }
.article-wrap ul, .article-wrap ol {
    margin: 0 0 1.5rem 0; padding: 0;
    list-style: none;
}
.article-wrap ul li, .article-wrap ol li {
    padding: 0.45rem 0 0.45rem 1.6rem;
    position: relative; font-size: 0.97rem;
    border-bottom: 1px solid rgba(0,0,0,0.04);
}
.article-wrap ul li:last-child, .article-wrap ol li:last-child { border-bottom: none; }
.article-wrap ul li::before {
    content: '→'; position: absolute; left: 0;
    color: var(--article-accent); font-weight: 700; font-size: 0.9rem;
}
.article-wrap ul li strong { color: var(--noir); font-weight: 600; }

/* Callout boxes */
.callout {
    display: flex; gap: 1rem; align-items: flex-start;
    padding: 1.4rem 1.6rem; border-radius: var(--radius-sm);
    margin: 2rem 0; border-left: 4px solid;
}
.callout-icon { font-size: 1.4rem; flex-shrink: 0; margin-top: 0.1rem; }
.callout-body { flex: 1; }
.callout-body p { margin-bottom: 0; }
.callout-body ul { margin-bottom: 0; }
.callout-body strong { display: block; margin-bottom: 0.4rem; font-size: 0.9rem; text-transform: uppercase; letter-spacing: 0.05em; }

.callout-info { background: rgba(0,105,92,0.06); border-color: var(--basque-vert); }
.callout-info .callout-body strong { color: var(--basque-vert); }
.callout-info .callout-body ul li::before { color: var(--basque-vert); }
.callout-warning { background: rgba(212,168,83,0.1); border-color: var(--or); }
.callout-warning .callout-body strong { color: #8a6a1a; }
.callout-success { background: rgba(39,174,96,0.08); border-color: var(--vert-clair); }
.callout-success .callout-body strong { color: var(--vert); }
.callout-danger { background: rgba(214,48,49,0.06); border-color: var(--basque-rouge); }
.callout-danger .callout-body strong { color: var(--basque-rouge); }

/* Étapes numérotées */
.steps { margin: 2rem 0; }
.step {
    display: flex; gap: 1.4rem; margin-bottom: 2rem;
    align-items: flex-start;
}
.step-number {
    flex-shrink: 0; width: 44px; height: 44px;
    background: var(--article-accent); color: white;
    border-radius: 50%; display: flex; align-items: center; justify-content: center;
    font-family: 'Playfair Display', serif; font-size: 1.1rem; font-weight: 700;
}
.step-content { flex: 1; }
.step-content h3 {
    margin: 0.5rem 0 0.5rem; color: var(--noir);
    font-size: 1rem;
}
.step-content h3::before { display: none; }
.step-content p { margin-bottom: 0.6rem; }

/* Séparateur de section */
.section-divider {
    border: none; border-top: 1px solid var(--gris-clair);
    margin: 3rem 0;
}

/* Badge durée */
.duration-badge {
    display: inline-block;
    background: var(--basque-rouge); color: white;
    padding: 0.2rem 0.7rem; border-radius: 6px;
    font-weight: 700; font-size: 0.9rem;
}

/* ═══════════════════════════════════════
   ARTICLES CONNEXES
═══════════════════════════════════════ */
.related-wrap {
    background: var(--creme); padding: 4rem 2rem;
}
.related-inner {
    max-width: 780px; margin: 0 auto;
}
.related-inner h2 {
    font-family: 'Playfair Display', serif;
    font-size: 1.5rem; font-weight: 700;
    margin-bottom: 1.5rem; letter-spacing: -0.02em;
}
.related-grid {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: 1.2rem;
}
.related-card {
    background: white; border-radius: var(--radius-sm);
    padding: 1.4rem; border: 1px solid #eee;
    text-decoration: none; color: var(--noir);
    display: flex; align-items: center; gap: 1rem;
    transition: var(--transition);
}
.related-card:hover {
    border-color: var(--article-accent);
    box-shadow: var(--ombre);
    transform: translateY(-2px);
}
.related-card-icon {
    font-size: 1.8rem; flex-shrink: 0;
}
.related-card-body small {
    font-size: 0.72rem; color: var(--article-accent);
    font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em;
}
.related-card-body p {
    font-size: 0.9rem; font-weight: 600; margin: 0.2rem 0 0;
    line-height: 1.35; color: var(--noir);
}

/* Retour au blog */
.back-to-blog {
    max-width: 780px; margin: 0 auto;
    padding: 2rem 2rem 0;
}
.back-link {
    display: inline-flex; align-items: center; gap: 0.5rem;
    font-size: 0.88rem; font-weight: 600; color: var(--gris);
    text-decoration: none; transition: var(--transition);
}
.back-link:hover { color: var(--basque-rouge); gap: 0.8rem; }

/* ═══════════════════════════════════════
   CTA BANNER
═══════════════════════════════════════ */
.cta-banner {
    background: var(--cta-gradient);
    color: white; text-align: center; padding: 5rem 2rem;
    position: relative; overflow: hidden;
}
.cta-banner::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.03'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
}
.cta-banner h2 {
    font-family: 'Playfair Display', serif;
    font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 700;
    margin-bottom: 1rem; position: relative;
}
.cta-banner p {
    font-size: 1.05rem; opacity: 0.85; margin-bottom: 2rem;
    max-width: 480px; margin-left: auto; margin-right: auto; position: relative;
}
.cta-banner .btn {
    display: inline-flex; align-items: center; gap: 0.5rem;
    padding: 1rem 2.2rem; border-radius: 50px; font-size: 0.95rem;
    font-weight: 700; text-decoration: none; transition: var(--transition);
    background: white; color: var(--cta-btn-color); position: relative;
}
.cta-banner .btn:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0,0,0,0.2); }

/* ═══════════════════════════════════════
   FOOTER
═══════════════════════════════════════ */
footer { background: var(--noir); color: white; padding: 4rem 2rem 2rem; }
.footer-inner { max-width: 1200px; margin: 0 auto; }
.footer-top { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; margin-bottom: 3rem; }
.footer-brand .logo { font-family: 'Playfair Display', serif; font-size: 1.5rem; font-weight: 700; color: white; margin-bottom: 1rem; display: block; }
.footer-brand .logo span { color: var(--basque-rouge); }
.footer-brand p { color: rgba(255,255,255,0.5); font-size: 0.88rem; line-height: 1.7; }
.footer-col h4 { font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.1em; margin-bottom: 1.2rem; color: rgba(255,255,255,0.4); }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 0.6rem; }
.footer-col ul a { color: rgba(255,255,255,0.7); text-decoration: none; font-size: 0.9rem; transition: var(--transition); }
.footer-col ul a:hover { color: white; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.08); padding-top: 2rem;
    display: flex; justify-content: space-between; align-items: center;
    font-size: 0.82rem; color: rgba(255,255,255,0.35);
}

/* ═══════════════════════════════════════
   RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 768px) {
    nav { padding: 0.6rem 1rem; }
    .nav-inner { flex-direction: column; align-items: stretch; gap: 0; }
    nav .logo { white-space: nowrap; font-size: 1.2rem; padding-bottom: 0.35rem; }
    .nav-links {
        display: flex !important; flex-direction: row;
        gap: 1rem; overflow-x: auto; flex-wrap: nowrap;
        padding-bottom: 0; width: 100%;
        -webkit-overflow-scrolling: touch;
        scrollbar-width: none; -ms-overflow-style: none;
    }
    .nav-links::-webkit-scrollbar { display: none; }
    .nav-links li { flex-shrink: 0; }
    .nav-links a { font-size: 0.82rem; }
    .article-hero { padding: 8rem 1.2rem 3rem; }
    .article-wrap { padding: 3rem 1.2rem 4rem; }
    .related-grid { grid-template-columns: 1fr; }
    .footer-top { grid-template-columns: 1fr; }
    .footer-bottom { flex-direction: column; gap: 0.5rem; text-align: center; }
    .back-to-blog { padding: 2rem 1.2rem 0; }
    .related-wrap { padding: 3rem 1.2rem; }
}

/* ═══════════════════════════════════════
   CALCULATEUR (outil interactif)
═══════════════════════════════════════ */
.calculator-card {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--ombre);
    margin: 2.5rem 0;
    overflow: hidden;
    border: 1px solid var(--gris-clair);
}
.calculator-header {
    background: var(--basque-vert);
    padding: 1.2rem 1.8rem;
    color: white;
}
.calculator-header h3 {
    margin: 0;
    font-size: 1.3rem;
    font-family: 'Playfair Display', serif;
    color: white;
    display: block;
    font-weight: 700;
}
.calculator-header h3::before { display: none; }
.calculator-header p {
    margin: 0.3rem 0 0;
    opacity: 0.85;
    font-size: 0.85rem;
    color: white;
    margin-bottom: 0;
}
.calculator-body { padding: 1.8rem; }

.calculator-body .form-group { margin-bottom: 1.4rem; }
.calculator-body .form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.4rem;
    font-size: 0.9rem;
    color: var(--noir);
}
.calculator-body select,
.calculator-body input[type="number"] {
    width: 100%;
    padding: 0.7rem 1rem;
    border-radius: 2rem;
    border: 1.5px solid var(--gris-clair);
    background: white;
    font-size: 0.9rem;
    font-family: 'DM Sans', sans-serif;
    transition: 0.2s;
}
.calculator-body select:focus,
.calculator-body input[type="number"]:focus {
    border-color: var(--basque-vert);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0,105,92,0.2);
}

.radio-group {
    display: flex;
    gap: 1rem;
    background: #f5f7f5;
    padding: 0.5rem;
    border-radius: 3rem;
    border: 1px solid var(--gris-clair);
}
.radio-group label {
    flex: 1;
    text-align: center;
    font-weight: 600;
    margin: 0;
    padding: 0.5rem 0;
    border-radius: 2rem;
    cursor: pointer;
    transition: 0.2s;
    background: transparent;
    color: var(--noir);
}
.radio-group input[type="radio"] { display: none; }
.radio-group input[type="radio"]:checked + label {
    background: var(--basque-vert);
    color: white;
}

.row-2col { display: flex; gap: 1rem; flex-wrap: wrap; }
.row-2col > div { flex: 1; min-width: 140px; }

.results-area {
    background: var(--creme);
    border-radius: var(--radius-sm);
    padding: 1.5rem;
    margin-top: 1.8rem;
    transition: all 0.2s;
}
.result-stats {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1.2rem;
}
.result-stat {
    background: white;
    border-radius: 1rem;
    padding: 1rem;
    flex: 1;
    min-width: 140px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.03);
    border: 1px solid #e2e2e2;
}
.result-stat .stat-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    color: var(--gris);
    letter-spacing: 0.5px;
}
.result-stat .stat-value {
    font-size: 1.6rem;
    font-weight: 800;
    color: var(--basque-vert);
    line-height: 1.2;
}

.comparison-block {
    background: #eef5ec;
    border-radius: 1rem;
    padding: 1rem;
    margin: 1rem 0;
    font-size: 0.9rem;
}
.eco-tip {
    background: #fef3e0;
    border-left: 4px solid var(--or);
    padding: 1rem;
    border-radius: 0.8rem;
    margin-top: 1rem;
}
.eco-tip strong { color: #b87c00; }

.price-hint {
    font-size: 0.75rem;
    color: var(--gris);
    margin-top: 0.3rem;
    text-align: right;
}

@media (max-width: 768px) {
    .calculator-body { padding: 1.2rem; }
    .result-stat .stat-value { font-size: 1.2rem; }
    .radio-group { flex-direction: column; gap: 0.4rem; border-radius: 1.5rem; }
}