/* ==========================================================================
   Breezewell Engineering — master stylesheet
   Premium HVAC theme: deep navy + Daikin blue + restrained warm gold.
   Cache-bust: bump ?v=NN in every HTML <link> whenever this file changes.
   ========================================================================== */

:root {
    /* Nature / eco-premium palette: deep forest green + warm sand + pale cream */
    --navy:        #234438;   /* "primary dark" — forest green: headings, footer, dark sections */
    --navy-soft:   #2E5648;
    --blue:        #8A5A34;   /* accent for links / small text on light (sand family, readable) */
    --blue-dark:   #6E4526;
    --sand:        #DDBEA0;   /* warm sand — primary button fill, accent band */
    --sand-dark:   #CBA179;
    --gold:        #C9A17E;   /* sparing accent — eyebrows on dark */
    --bg:          #FFFFFF;
    --bg-alt:      #F7F3EC;   /* pale cream sections */
    --card:        #FFFFFF;
    --border:      #E7E0D4;
    --text:        #2B3A33;   /* dark slate green */
    --text-light:  #5C6B62;
    --on-dark:     #EDE6DA;
    --on-dark-dim: #BBC9BF;
    --transition:  all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    color: var(--text);
    background-color: var(--bg);
    line-height: 1.65;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
    font-family: 'Montserrat', 'Inter', sans-serif;
    color: var(--navy);
    line-height: 1.2;
}

img { max-width: 100%; display: block; }
a { color: var(--blue); }

/* ------------------------------------------------------------------ Header */
header {
    position: fixed;
    top: 0; width: 100%;
    background: rgba(255, 255, 255, 0.96);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 16px rgba(14, 42, 71, 0.08);
    z-index: 1000;
    padding: 12px 0;
    transition: var(--transition);
}

.container { max-width: 1280px; margin: 0 auto; padding: 0 40px; }

.nav-wrapper { display: flex; justify-content: space-between; align-items: center; }

.logo img { height: 66px; width: auto; }

.nav-links { display: flex; gap: 34px; align-items: center; }

.nav-links a {
    text-decoration: none;
    color: var(--navy);
    font-weight: 600;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.4px;
    transition: var(--transition);
}
.nav-links a:hover,
.nav-links a.active { color: var(--blue); }
.nav-links a.btn-solid,
.nav-links a.btn-solid.active { color: #fff; }

/* ------------------------------------------------------------------ Buttons */
.btn-solid,
.btn-outline {
    display: inline-block;
    padding: 13px 30px;
    border-radius: 4px;
    font-weight: 600;
    font-size: 0.95rem;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid var(--sand);
}
.btn-solid { background-color: var(--sand); color: var(--navy); }
.btn-solid:hover { background-color: var(--sand-dark); border-color: var(--sand-dark); transform: translateY(-2px); box-shadow: 0 12px 22px rgba(35, 68, 56, 0.2); }

.btn-outline { background-color: transparent; color: var(--navy); border-color: var(--navy); }
.btn-outline:hover { background-color: var(--navy); color: var(--on-dark); transform: translateY(-2px); }

/* Button variants for dark backgrounds */
.on-dark .btn-outline { border-color: var(--sand); color: var(--sand); }
.on-dark .btn-outline:hover { background-color: var(--sand); color: var(--navy); }

/* ------------------------------------------------------------------ Page header */
.page-header {
    background:
        linear-gradient(rgba(35, 68, 56, 0.88), rgba(35, 68, 56, 0.88)),
        var(--navy);
    background-size: cover;
    background-position: center;
    padding: 160px 0 80px;
    text-align: center;
    color: var(--on-dark);
}
.page-header h1 { color: #fff; font-size: 3rem; margin-bottom: 16px; }
.page-header p { color: var(--on-dark); font-size: 1.15rem; max-width: 640px; margin: 0 auto; }

/* ------------------------------------------------------------------ Sections */
.section { padding: 100px 0; }
.section.bg-alt { background-color: var(--bg-alt); }

.section-header { text-align: center; margin-bottom: 50px; }
.section-header h4 {
    color: var(--blue);
    font-family: 'Inter', sans-serif;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-bottom: 14px;
    font-size: 0.85rem;
    font-weight: 700;
}
.section-header h2 { font-size: 2.6rem; margin-bottom: 18px; }
.section-header p { color: var(--text-light); font-size: 1.1rem; max-width: 620px; margin: 0 auto; }

/* Dark section wrapper */
.on-dark { background: var(--navy); color: var(--on-dark); }
.on-dark h1, .on-dark h2, .on-dark h3, .on-dark h4, .on-dark h5 { color: #fff; }
.on-dark p { color: var(--on-dark-dim); }
.on-dark .section-header h4 { color: var(--gold); }

/* ------------------------------------------------------------------ Cards grid (generic) */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 28px;
}
.card {
    background-color: var(--card);
    border: 1px solid var(--border);
    border-radius: 10px;
    padding: 36px;
    transition: var(--transition);
}
.card:hover { transform: translateY(-8px); border-color: var(--blue); box-shadow: 0 18px 40px rgba(14, 42, 71, 0.1); }
.card i { font-size: 2.2rem; color: var(--blue); margin-bottom: 20px; }
.card h3 { font-size: 1.35rem; margin-bottom: 12px; color: var(--navy); }
.card p { color: var(--text-light); font-size: 0.98rem; }

/* ------------------------------------------------------------------ Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
    margin-top: 36px;
    padding-top: 36px;
    border-top: 1px solid var(--border);
}
.stat-item h3 { font-size: 2.3rem; color: var(--blue); margin-bottom: 4px; }
.stat-item p { font-size: 0.82rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.5px; color: var(--text-light); }
.on-dark .stats-grid { border-top-color: rgba(255,255,255,0.15); }
.on-dark .stat-item h3 { color: var(--gold); }
.on-dark .stat-item p { color: var(--on-dark-dim); }

/* ------------------------------------------------------------------ Product cards */
.product-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); gap: 32px; margin-top: 40px; }
.product-card { background: var(--card); border-radius: 10px; overflow: hidden; box-shadow: 0 10px 30px rgba(14,42,71,0.06); transition: var(--transition); border: 1px solid var(--border); }
.product-card:hover { transform: translateY(-8px); box-shadow: 0 20px 44px rgba(10, 109, 180, 0.15); border-color: var(--blue); }
.product-img { width: 100%; height: 230px; object-fit: cover; background: #fff; }
.product-info { padding: 28px; text-align: center; }
.product-info h3 { color: var(--navy); font-size: 1.3rem; margin-bottom: 10px; }
.product-info p { color: var(--text-light); font-size: 0.95rem; }

/* ------------------------------------------------------------------ Projects list */
.project-tags { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 36px; }
.project-tags span {
    background: var(--bg);
    border: 1px solid var(--border);
    color: var(--navy);
    padding: 9px 16px;
    border-radius: 999px;
    font-size: 0.88rem;
    font-weight: 600;
}
.on-dark .project-tags span { background: var(--navy-soft); border-color: rgba(255,255,255,0.15); color: var(--on-dark); }

/* ------------------------------------------------------------------ Footer */
footer { background-color: var(--navy); color: var(--on-dark-dim); padding: 56px 0 22px; margin-top: auto; }
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 34px; }
.footer-brand img { max-height: 96px; margin-bottom: 18px; background: #fff; padding: 12px 18px; border-radius: 10px; }
.footer-brand p { max-width: 320px; font-size: 0.92rem; color: var(--on-dark-dim); }
.footer-col h5 { color: #fff; font-size: 1.05rem; margin-bottom: 20px; }
.footer-links { list-style: none; }
.footer-links li { margin-bottom: 12px; }
.footer-links a { color: var(--on-dark-dim); text-decoration: none; transition: var(--transition); }
.footer-links a:hover { color: #fff; }
.footer-bottom {
    text-align: center;
    padding-top: 26px;
    border-top: 1px solid rgba(255,255,255,0.12);
    font-size: 0.86rem;
    color: var(--on-dark-dim);
}
.footer-bottom a { color: var(--on-dark-dim); text-decoration: none; margin: 0 10px; }
.footer-bottom a:hover { color: #fff; }

/* ------------------------------------------------------------------ WhatsApp float */
.whatsapp-float {
    position: fixed;
    width: 58px; height: 58px;
    bottom: 26px; right: 26px;
    background-color: #25d366; color: #fff;
    border-radius: 50%;
    font-size: 30px;
    box-shadow: 0 10px 22px rgba(37, 211, 102, 0.4);
    z-index: 1000;
    display: flex; align-items: center; justify-content: center;
    text-decoration: none; transition: transform 0.3s;
}
.whatsapp-float:hover { transform: scale(1.08); }

/* ------------------------------------------------------------------ Mobile nav toggle */
.menu-toggle { display: none; font-size: 1.7rem; color: var(--navy); cursor: pointer; padding: 6px; background: none; border: none; }

/* ------------------------------------------------------------------ Responsive */
@media (max-width: 900px) {
    .footer-grid { grid-template-columns: 1fr 1fr; gap: 30px; }
}

@media (max-width: 768px) {
    .container { padding: 0 20px; }
    .section { padding: 64px 0; }
    .section-header h2 { font-size: 1.9rem; }
    .page-header { padding: 130px 0 54px; }
    .page-header h1 { font-size: 2.1rem; }
    .stats-grid { grid-template-columns: 1fr; gap: 24px; text-align: center; }
    .footer-grid { grid-template-columns: 1fr; gap: 26px; }

    .menu-toggle { display: block; }
    .nav-links {
        position: absolute; top: 100%; left: 0; width: 100%;
        background: #fff; flex-direction: column; gap: 0;
        padding: 0; box-shadow: 0 12px 22px rgba(14,42,71,0.12);
        display: none; border-top: 1px solid var(--border);
    }
    .nav-links.active { display: flex; }
    .nav-links a {
        display: block; text-align: center; width: 100%;
        padding: 18px; font-size: 1rem;
        border-bottom: 1px solid var(--border);
    }
    .nav-links a.btn-solid { border: none; border-bottom: 1px solid var(--border); }
}