/* ==========================================================================
   Clean Air — Feuille de styles
   Palette : bleu profond + bleu ciel + blanc + gris clair (univers HVAC)
   ========================================================================== */

:root {
    --color-primary: #0d4a7d;
    --color-primary-dark: #082f50;
    --color-secondary: #5db8e6;
    --color-secondary-dark: #2e8fc2;
    --color-bg: #ffffff;
    --color-bg-soft: #f4f8fb;
    --color-bg-alt: #e7f2f9;
    --color-text: #142233;
    --color-text-soft: #4a5a6e;
    --color-border: #d6e2ec;
    --color-footer: #0a1f33;
    --color-footer-text: #c8d6e3;
    --shadow-sm: 0 2px 6px rgba(13, 74, 125, 0.06);
    --shadow-md: 0 8px 24px rgba(13, 74, 125, 0.10);
    --radius: 10px;
    --container: 1180px;
    --transition: 0.2s ease;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    color: var(--color-text);
    background: var(--color-bg);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-secondary-dark); }

h1, h2, h3, h4 { color: var(--color-text); line-height: 1.25; margin: 0 0 0.6em; }
h1 { font-size: 2.4rem; }
h2 { font-size: 1.7rem; margin-top: 0; }
h3 { font-size: 1.2rem; }
h4 { font-size: 1rem; }

p { margin: 0 0 1em; color: var(--color-text-soft); }

ul { padding-left: 1.2em; margin: 0 0 1em; }
ul li { margin-bottom: 0.4em; color: var(--color-text-soft); }

.container {
    max-width: var(--container);
    margin: 0 auto;
    padding: 0 24px;
}

/* ===== Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: saturate(160%) blur(8px);
    border-bottom: 1px solid var(--color-border);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 1.05rem;
    color: var(--color-text);
    letter-spacing: 0.3px;
}

.logo-mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 42px;
    height: 42px;
    border-radius: 8px;
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
    color: #fff;
    font-weight: 800;
    font-size: 0.9rem;
    box-shadow: 0 4px 12px rgba(13, 74, 125, 0.30);
    position: relative;
    overflow: hidden;
}
.logo-mark::after {
    content: "";
    position: absolute;
    width: 100%;
    height: 6px;
    bottom: 4px;
    left: 0;
    background: linear-gradient(90deg, transparent 0%, rgba(255, 255, 255, 0.3) 50%, transparent 100%);
}

.main-nav ul {
    display: flex;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav a {
    display: inline-block;
    padding: 8px 14px;
    color: var(--color-text);
    font-weight: 500;
    border-radius: 6px;
}

.main-nav a:hover,
.main-nav a.active { background: var(--color-bg-alt); color: var(--color-primary); }

.main-nav a.nav-cta {
    background: var(--color-primary);
    color: #fff;
    font-weight: 600;
}
.main-nav a.nav-cta:hover { background: var(--color-primary-dark); color: #fff; }

.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    padding: 6px 12px;
    font-size: 1.2rem;
    cursor: pointer;
    color: var(--color-text);
}

/* ===== Buttons ===== */
.btn {
    display: inline-block;
    padding: 12px 22px;
    border-radius: 6px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    text-align: center;
}
.btn-primary { background: var(--color-primary); color: #fff; }
.btn-primary:hover { background: var(--color-primary-dark); color: #fff; }
.btn-ghost { background: transparent; color: var(--color-primary); border: 1.5px solid var(--color-primary); }
.btn-ghost:hover { background: var(--color-bg-alt); }
.btn-lg { padding: 14px 28px; font-size: 1rem; }

.center { text-align: center; margin-top: 24px; }

/* ===== Hero ===== */
.hero {
    background:
        linear-gradient(135deg, rgba(13, 74, 125, 0.04) 0%, rgba(93, 184, 230, 0.10) 100%),
        #ffffff;
    padding: 70px 0 60px;
    border-bottom: 1px solid var(--color-border);
    position: relative;
    overflow: hidden;
}
.hero::before {
    content: "";
    position: absolute;
    top: -120px; right: -120px;
    width: 360px; height: 360px;
    background: radial-gradient(circle, rgba(93, 184, 230, 0.18) 0%, transparent 70%);
    border-radius: 50%;
    pointer-events: none;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 50px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.eyebrow {
    display: inline-block;
    background: #fff;
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.78rem;
    padding: 5px 14px;
    border-radius: 4px;
    margin-bottom: 16px;
    border: 1px solid var(--color-border);
    letter-spacing: 0.6px;
    text-transform: uppercase;
}

.hero h1 { font-size: 2.6rem; margin-bottom: 16px; }
.hero p { font-size: 1.05rem; color: var(--color-text-soft); }

.hero-cta {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 22px 0;
}

.hero-points {
    list-style: none;
    padding: 0;
    margin: 18px 0 0;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 8px 18px;
}
.hero-points li {
    color: var(--color-text);
    font-weight: 500;
    margin: 0;
    font-size: 0.95rem;
}

.hero-card {
    background: #fff;
    border-radius: 12px;
    padding: 30px;
    box-shadow: var(--shadow-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 22px;
    border: 1px solid var(--color-border);
    border-top: 4px solid var(--color-primary);
}

.hero-stat {
    text-align: center;
    padding: 14px;
    background: var(--color-bg-soft);
    border-radius: 8px;
}
.hero-stat .num {
    display: block;
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--color-primary);
    line-height: 1;
    margin-bottom: 6px;
}
.hero-stat .lbl {
    display: block;
    font-size: 0.85rem;
    color: var(--color-text-soft);
}

/* ===== Sections ===== */
.section { padding: 70px 0; }
.section-alt { background: var(--color-bg-soft); }

.section-head {
    text-align: center;
    max-width: 760px;
    margin: 0 auto 50px;
}
.section-head h2 { font-size: 2rem; }
.section-head p { font-size: 1.05rem; }

/* ===== Cards (services on home) ===== */
.cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px 22px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    border-top: 3px solid var(--color-secondary);
}
.card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-top-color: var(--color-primary);
}
.card-icon {
    font-size: 2rem;
    margin-bottom: 12px;
    display: inline-flex;
    width: 48px; height: 48px;
    background: var(--color-bg-alt);
    border-radius: 8px;
    align-items: center;
    justify-content: center;
}
.card h3 { font-size: 1.05rem; margin-bottom: 8px; }
.card p { font-size: 0.92rem; margin: 0; }

/* ===== Features ===== */
.features {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.feature {
    background: #fff;
    border-radius: var(--radius);
    padding: 26px;
    border-left: 4px solid var(--color-secondary);
    box-shadow: var(--shadow-sm);
}
.feature h3 { color: var(--color-primary); margin-bottom: 8px; }
.feature p { margin: 0; font-size: 0.95rem; }

/* ===== Testimonials ===== */
.testimonials {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
}
.testimonial {
    background: #fff;
    border-radius: var(--radius);
    padding: 26px;
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    margin: 0;
}
.testimonial p {
    font-style: italic;
    color: var(--color-text);
    margin-bottom: 14px;
}
.testimonial footer {
    color: var(--color-primary);
    font-weight: 600;
    font-size: 0.9rem;
}

/* ===== CTA band ===== */
.cta-band {
    background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary-dark) 100%);
    color: #fff;
    padding: 50px 0;
}
.cta-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 22px;
    flex-wrap: wrap;
}
.cta-band h2 { color: #fff; margin-bottom: 8px; }
.cta-band p { color: rgba(255, 255, 255, 0.92); margin: 0; }
.cta-band .btn-primary { background: #fff; color: var(--color-primary); }
.cta-band .btn-primary:hover { background: var(--color-bg-alt); color: var(--color-primary); }

/* ===== Page hero (subpages) ===== */
.page-hero {
    background:
        linear-gradient(135deg, rgba(13, 74, 125, 0.04) 0%, rgba(93, 184, 230, 0.10) 100%),
        #ffffff;
    padding: 60px 0 50px;
    border-bottom: 1px solid var(--color-border);
}
.page-hero h1 { font-size: 2.2rem; margin-bottom: 12px; }
.page-hero p { max-width: 760px; font-size: 1.02rem; }

.breadcrumb {
    font-size: 0.88rem;
    color: var(--color-text-soft);
    margin-bottom: 14px;
}
.breadcrumb a { color: var(--color-primary); }

/* ===== Service blocks ===== */
.service-block {
    display: grid;
    grid-template-columns: 90px 1fr;
    gap: 26px;
    padding: 32px 0;
    border-bottom: 1px solid var(--color-border);
}
.service-block:last-child { border-bottom: none; }
.service-block-icon {
    font-size: 2.4rem;
    background: var(--color-bg-alt);
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 12px;
    border: 1px solid var(--color-border);
}
.service-block h2 { font-size: 1.35rem; color: var(--color-primary); }
.service-block ul { margin-top: 10px; }

/* ===== Two-column layouts ===== */
.two-col {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
}
.two-col-form {
    display: grid;
    grid-template-columns: 1fr 1.2fr;
    gap: 50px;
}

/* ===== Forms ===== */
.form {
    background: #fff;
    padding: 28px;
    border-radius: var(--radius);
    border: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
    margin-bottom: 14px;
}
.form label {
    display: block;
    margin-bottom: 14px;
    font-size: 0.92rem;
    font-weight: 500;
    color: var(--color-text);
}
.form input,
.form select,
.form textarea {
    width: 100%;
    margin-top: 6px;
    padding: 11px 14px;
    border: 1px solid var(--color-border);
    border-radius: 6px;
    font-size: 0.95rem;
    background: #fff;
    color: var(--color-text);
    font-family: inherit;
    transition: var(--transition);
}
.form input:focus,
.form select:focus,
.form textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(13, 74, 125, 0.15);
}
.form textarea { resize: vertical; }
.form .checkbox {
    display: flex;
    gap: 10px;
    align-items: flex-start;
    font-size: 0.88rem;
    color: var(--color-text-soft);
    font-weight: 400;
}
.form .checkbox input { width: auto; margin-top: 4px; }
.form-success {
    margin-top: 14px;
    padding: 12px 16px;
    background: #e3f3df;
    border: 1px solid #76c66a;
    color: #2d6e23;
    border-radius: 6px;
    font-size: 0.92rem;
}

.steps {
    counter-reset: step;
    list-style: none;
    padding: 0;
}
.steps li {
    counter-increment: step;
    padding-left: 50px;
    position: relative;
    margin-bottom: 18px;
}
.steps li::before {
    content: counter(step);
    position: absolute;
    left: 0;
    top: 0;
    width: 34px;
    height: 34px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
}

/* ===== Process steps (horizontal) ===== */
.process {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 22px;
}
.process-step {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    border: 1px solid var(--color-border);
    text-align: left;
    position: relative;
}
.process-step .num {
    width: 38px; height: 38px;
    border-radius: 50%;
    background: var(--color-primary);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    margin-bottom: 12px;
}
.process-step h3 { font-size: 1.05rem; margin-bottom: 6px; }
.process-step p { font-size: 0.9rem; margin: 0; }

/* ===== Callout ===== */
.callout {
    background: var(--color-bg-alt);
    border-left: 4px solid var(--color-primary);
    padding: 18px 22px;
    border-radius: 6px;
    margin: 18px 0 24px;
}
.callout strong { color: var(--color-primary); }
.callout p { margin: 6px 0 0; }

.map-wrap {
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--color-border);
}

/* ===== Content (legal) pages ===== */
.content-page {
    padding: 50px 0 70px;
}
.content-page h1 { font-size: 2rem; margin-bottom: 8px; }
.content-page h2 {
    font-size: 1.3rem;
    margin-top: 32px;
    color: var(--color-primary);
}
.content-page h3 {
    font-size: 1.05rem;
    margin-top: 22px;
    color: var(--color-text);
}
.content-page p, .content-page ul li { color: var(--color-text); }
.legal-date { color: var(--color-text-soft); font-size: 0.9rem; margin-bottom: 26px; }

/* ===== Footer ===== */
.site-footer {
    background: var(--color-footer);
    color: var(--color-footer-text);
    padding: 50px 0 22px;
    margin-top: 0;
}
.site-footer h4 {
    color: #fff;
    margin-bottom: 12px;
    font-size: 1rem;
    letter-spacing: 0.3px;
}
.site-footer p, .site-footer li { color: var(--color-footer-text); font-size: 0.92rem; }
.site-footer a { color: #fff; }
.site-footer a:hover { color: var(--color-secondary); }
.footer-grid {
    display: grid;
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 30px;
    padding-bottom: 30px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid ul li { margin-bottom: 6px; }
.legal-info { font-size: 0.85rem; opacity: 0.85; margin-top: 10px; }
.footer-bottom {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 8px;
    padding-top: 22px;
    font-size: 0.85rem;
    color: rgba(255, 255, 255, 0.65);
}

/* ===== Cookie banner ===== */
.cookie-banner {
    position: fixed;
    bottom: 16px;
    left: 16px;
    right: 16px;
    background: #fff;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow-md);
    padding: 18px;
    display: none;
    z-index: 100;
    max-width: 720px;
    margin: 0 auto;
}
.cookie-banner.show { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; justify-content: space-between; }
.cookie-banner p { margin: 0; flex: 1 1 280px; font-size: 0.92rem; }
.cookie-actions { display: flex; gap: 8px; }
.cookie-actions .btn { padding: 8px 16px; font-size: 0.88rem; }

/* ===== Responsive ===== */
@media (max-width: 960px) {
    .hero-inner { grid-template-columns: 1fr; gap: 30px; }
    .hero h1 { font-size: 2rem; }
    .cards { grid-template-columns: repeat(2, 1fr); }
    .features { grid-template-columns: 1fr 1fr; }
    .testimonials { grid-template-columns: 1fr; }
    .two-col, .two-col-form { grid-template-columns: 1fr; gap: 30px; }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .process { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 720px) {
    h1 { font-size: 1.7rem; }
    .hero { padding: 50px 0 40px; }
    .hero h1 { font-size: 1.7rem; }
    .hero-card { grid-template-columns: 1fr; }
    .hero-points { grid-template-columns: 1fr; }
    .section { padding: 50px 0; }
    .cards { grid-template-columns: 1fr; }
    .features { grid-template-columns: 1fr; }
    .form-row { grid-template-columns: 1fr; }
    .service-block { grid-template-columns: 1fr; }
    .service-block-icon { width: 70px; height: 70px; font-size: 2rem; }
    .footer-grid { grid-template-columns: 1fr; }
    .cta-inner { flex-direction: column; align-items: flex-start; }
    .process { grid-template-columns: 1fr; }
    .nav-toggle { display: inline-block; }
    .main-nav {
        position: absolute;
        top: 72px; left: 0; right: 0;
        background: #fff;
        border-bottom: 1px solid var(--color-border);
        display: none;
        padding: 12px 24px;
    }
    .main-nav.open { display: block; }
    .main-nav ul { flex-direction: column; gap: 0; }
    .main-nav a { display: block; padding: 12px 0; border-bottom: 1px solid var(--color-border); border-radius: 0; }
    .main-nav a.nav-cta { margin-top: 8px; text-align: center; border-radius: 6px; border: none; }
}