/* =========================================================
 * Jet Life Sciences - Main Stylesheet
 * Modern, compact, elegant design
 * ========================================================= */

:root {
    --color-primary: #1a5ca8;
    --color-primary-dark: #0d3d79;
    --color-primary-light: #e8f1fb;
    --color-accent: #00a99d;
    --color-accent-dark: #00897d;
    --color-dark: #1a1f35;
    --color-dark-2: #2c3e50;
    --color-gray-50: #f8fafc;
    --color-gray-100: #f1f5f9;
    --color-gray-200: #e2e8f0;
    --color-gray-300: #cbd5e1;
    --color-gray-400: #94a3b8;
    --color-gray-500: #64748b;
    --color-gray-600: #475569;
    --color-gray-700: #334155;
    --color-text: #1e293b;
    --color-text-light: #64748b;
    --color-border: #e2e8f0;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-danger: #ef4444;
    --color-info: #3b82f6;
    --color-bg: #ffffff;
    --color-bg-alt: #f8fafc;
    --shadow-sm: 0 1px 2px 0 rgba(0,0,0,.05);
    --shadow: 0 1px 3px 0 rgba(0,0,0,.1), 0 1px 2px 0 rgba(0,0,0,.06);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,.1), 0 4px 6px -2px rgba(0,0,0,.05);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,.1), 0 10px 10px -5px rgba(0,0,0,.04);
    --radius-sm: 4px;
    --radius: 6px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 20px;
    --font-sans: "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
    --header-height: 72px;
    --container-max: 1320px;
    --transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { font-size: 14px; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

body {
    font-family: var(--font-sans);
    font-size: 14px;
    line-height: 1.6;
    color: var(--color-text);
    background: var(--color-bg);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a { color: var(--color-primary); text-decoration: none; transition: var(--transition); }
a:hover { color: var(--color-primary-dark); }

img { max-width: 100%; height: auto; display: block; }

h1, h2, h3, h4, h5, h6 {
    font-weight: 600; line-height: 1.3; color: var(--color-dark); margin: 0 0 0.5em;
}
h1 { font-size: 2.25rem; }
h2 { font-size: 1.75rem; }
h3 { font-size: 1.375rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }
p { margin-bottom: 1rem; }

ul, ol { margin-bottom: 1rem; margin-left: 1.25rem; }

/* ---------------- Layout ---------------- */
.container {
    width: 100%;
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 20px;
}
.container-fluid { width: 100%; padding: 0 20px; }

.row { display: flex; flex-wrap: wrap; margin: 0 -12px; }
.col { flex: 1; padding: 0 12px; }
.col-2, .col-3, .col-4, .col-6, .col-8, .col-9, .col-12 { padding: 0 12px; }
.col-2 { flex: 0 0 16.666%; }
.col-3 { flex: 0 0 25%; }
.col-4 { flex: 0 0 33.333%; }
.col-6 { flex: 0 0 50%; }
.col-8 { flex: 0 0 66.666%; }
.col-9 { flex: 0 0 75%; }
.col-12 { flex: 0 0 100%; }

.section { padding: 80px 0; }
.section-sm { padding: 50px 0; }
.section-title { text-align: center; margin-bottom: 48px; }
.section-title h2 { font-size: 2rem; margin-bottom: 12px; }
.section-title p { color: var(--color-text-light); font-size: 1rem; }

/* ---------------- Header ---------------- */
.site-header {
    position: sticky; top: 0; z-index: 1000;
    background: #fff; box-shadow: var(--shadow-sm);
    border-bottom: 1px solid var(--color-border);
}
.header-top {
    background: var(--color-dark); color: #fff; font-size: 0.8rem;
    padding: 6px 0;
}
.header-top .row { display: flex; justify-content: space-between; align-items: center; }
.header-top a { color: #cbd5e1; margin-right: 16px; }
.header-top a:hover { color: #fff; }

.navbar { display: flex; align-items: center; justify-content: space-between; padding: 16px 0; }
.logo { display: flex; align-items: center; gap: 12px; font-size: 1.375rem; font-weight: 700; color: var(--color-primary); }
.logo-mark {
    width: 42px; height: 42px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
    color: #fff; font-weight: 800; font-size: 1.1rem;
}

.main-nav { display: flex; align-items: center; gap: 4px; }
.main-nav > li { list-style: none; position: relative; }
.main-nav > li > a {
    display: block; padding: 10px 16px; font-weight: 500; color: var(--color-dark-2);
    border-radius: var(--radius-sm); font-size: 0.95rem;
}
.main-nav > li > a:hover, .main-nav > li.active > a { background: var(--color-primary-light); color: var(--color-primary); }
.main-nav .has-children > a::after { content: " ▾"; font-size: 0.75rem; opacity: .6; }
.main-nav .submenu {
    position: absolute; top: 100%; left: 0; min-width: 220px;
    background: #fff; box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md); padding: 8px;
    opacity: 0; visibility: hidden; transform: translateY(10px);
    transition: var(--transition); border: 1px solid var(--color-border);
}
.main-nav .has-children:hover .submenu { opacity: 1; visibility: visible; transform: translateY(0); }
.main-nav .submenu li { list-style: none; }
.main-nav .submenu li a { display: block; padding: 8px 12px; color: var(--color-dark-2); border-radius: var(--radius-sm); font-size: 0.9rem; }
.main-nav .submenu li a:hover { background: var(--color-primary-light); color: var(--color-primary); }

.header-actions { display: flex; align-items: center; gap: 12px; }

.search-box { display: flex; align-items: center; background: var(--color-gray-100); border-radius: 999px; padding: 6px 12px; }
.search-box input { border: none; background: transparent; outline: none; padding: 4px 8px; font-size: 0.9rem; width: 180px; }
.search-box button { background: none; border: none; cursor: pointer; color: var(--color-gray-500); }

.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: 6px;
    padding: 8px 18px; font-size: 0.9rem; font-weight: 500;
    border: 1px solid transparent; border-radius: var(--radius);
    cursor: pointer; transition: var(--transition); background: #fff; color: var(--color-text);
    text-decoration: none; line-height: 1.4;
}
.btn-primary { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }
.btn-primary:hover { background: var(--color-primary-dark); border-color: var(--color-primary-dark); color: #fff; box-shadow: 0 4px 12px rgba(26, 92, 168, 0.3); }
.btn-outline { background: transparent; color: var(--color-primary); border-color: var(--color-primary); }
.btn-outline:hover { background: var(--color-primary); color: #fff; }
.btn-accent { background: var(--color-accent); color: #fff; border-color: var(--color-accent); }
.btn-accent:hover { background: var(--color-accent-dark); color: #fff; }
.btn-lg { padding: 10px 24px; font-size: 1rem; }
.btn-sm { padding: 6px 12px; font-size: 0.85rem; }
.btn-block { display: flex; width: 100%; }

.lang-switcher { position: relative; cursor: pointer; }
.lang-switcher .current-flag { padding: 8px 12px; border-radius: var(--radius-sm); background: var(--color-gray-100); font-size: 1rem; }
.lang-switcher .lang-dropdown {
    position: absolute; top: 100%; right: 0; min-width: 140px;
    background: #fff; box-shadow: var(--shadow-lg); border-radius: var(--radius-md);
    padding: 6px; opacity: 0; visibility: hidden; transform: translateY(8px);
    transition: var(--transition); border: 1px solid var(--color-border);
    list-style: none; margin: 4px 0 0; z-index: 10;
}
.lang-switcher:hover .lang-dropdown { opacity: 1; visibility: visible; transform: translateY(0); }
.lang-switcher .lang-dropdown li a { display: block; padding: 8px 12px; color: var(--color-text); font-size: 0.9rem; border-radius: var(--radius-sm); }
.lang-switcher .lang-dropdown li.active a { background: var(--color-primary-light); color: var(--color-primary); }
.lang-switcher .lang-dropdown li a:hover { background: var(--color-gray-100); }

/* ---------------- Hero / Banner ---------------- */
.hero {
    position: relative; min-height: 480px;
    background: linear-gradient(135deg, #0d3d79 0%, #1a5ca8 50%, #00a99d 100%);
    color: #fff; overflow: hidden; display: flex; align-items: center;
}
.hero::before {
    content: ''; position: absolute; inset: 0;
    background:
        radial-gradient(circle at 20% 50%, rgba(255,255,255,0.08) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255,255,255,0.05) 0%, transparent 50%);
}
.hero-content { position: relative; z-index: 2; padding: 100px 0; max-width: 680px; }
.hero-content h1 { color: #fff; font-size: 2.75rem; margin-bottom: 20px; line-height: 1.2; }
.hero-content p { font-size: 1.125rem; color: rgba(255,255,255,0.9); margin-bottom: 32px; }
.hero-content .btn { margin-right: 12px; }

/* ---------------- Feature Cards ---------------- */
.feature-cards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.feature-card {
    background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    padding: 32px 24px; text-align: center; transition: var(--transition);
}
.feature-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-light); }
.feature-icon {
    width: 64px; height: 64px; margin: 0 auto 20px;
    background: var(--color-primary-light); color: var(--color-primary);
    border-radius: var(--radius-md); display: flex; align-items: center; justify-content: center;
    font-size: 1.75rem;
}
.feature-card h4 { margin-bottom: 10px; }
.feature-card p { color: var(--color-text-light); font-size: 0.9rem; margin: 0; }

/* ---------------- Categories ---------------- */
.category-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.category-item {
    display: block; background: #fff; border: 1px solid var(--color-border);
    border-radius: var(--radius-lg); padding: 32px 24px; transition: var(--transition);
}
.category-item:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary); }
.category-icon {
    width: 56px; height: 56px; margin-bottom: 16px;
    background: linear-gradient(135deg, var(--color-primary), var(--color-accent));
    color: #fff; border-radius: var(--radius); display: flex;
    align-items: center; justify-content: center; font-size: 1.5rem;
}
.category-item h4 { margin-bottom: 8px; color: var(--color-dark); }
.category-item p { color: var(--color-text-light); font-size: 0.9rem; margin-bottom: 16px; }
.category-item .cat-link { font-weight: 500; color: var(--color-primary); }

/* ---------------- Products ---------------- */
.product-layout { display: grid; grid-template-columns: 280px 1fr; gap: 32px; }
.sidebar { background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); padding: 24px; height: fit-content; position: sticky; top: 90px; }
.sidebar-title { font-size: 1.05rem; font-weight: 600; margin-bottom: 16px; padding-bottom: 12px; border-bottom: 1px solid var(--color-border); }
.sidebar-nav { list-style: none; margin: 0; padding: 0; }
.sidebar-nav li { margin-bottom: 2px; }
.sidebar-nav > li > a { display: flex; justify-content: space-between; align-items: center; padding: 10px 14px; color: var(--color-dark-2); border-radius: var(--radius-sm); font-size: 0.92rem; transition: var(--transition); }
.sidebar-nav > li.active > a, .sidebar-nav > li > a:hover { background: var(--color-primary-light); color: var(--color-primary); font-weight: 500; }
.sidebar-nav ul { list-style: none; margin: 4px 0 8px; padding-left: 16px; }
.sidebar-nav ul li a { font-size: 0.88rem; padding: 8px 12px; color: var(--color-text-light); }

.product-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.product-card {
    background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg);
    overflow: hidden; transition: var(--transition); position: relative;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); border-color: var(--color-primary-light); }
.product-image { height: 200px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); position: relative; overflow: hidden; display: flex; align-items: center; justify-content: center; font-size: 3rem; color: rgba(255, 255, 255, 0.8); }
.product-image::before { content: ''; position: absolute; inset: 0; background: linear-gradient(135deg, #e8f1fb, #ffffff); }
.product-image svg, .product-image i { position: relative; z-index: 2; }
.product-badge { position: absolute; top: 12px; left: 12px; background: var(--color-accent); color: #fff; padding: 4px 10px; border-radius: 999px; font-size: 0.75rem; font-weight: 500; z-index: 3; }
.product-body { padding: 20px; }
.product-body .sku { color: var(--color-text-light); font-size: 0.8rem; margin-bottom: 6px; }
.product-body h4 { font-size: 1.05rem; margin-bottom: 10px; line-height: 1.4; }
.product-body h4 a { color: var(--color-dark); }
.product-body h4 a:hover { color: var(--color-primary); }
.product-body p { color: var(--color-text-light); font-size: 0.88rem; margin-bottom: 16px; }
.product-footer { display: flex; align-items: center; justify-content: space-between; padding-top: 12px; border-top: 1px solid var(--color-border); }
.price { font-weight: 700; color: var(--color-primary); font-size: 1.05rem; }
.price-label { color: var(--color-text-light); font-size: 0.85rem; }

/* ---------------- Product Detail ---------------- */
.product-detail { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; }
.product-gallery { background: linear-gradient(135deg, var(--color-primary-light), #fff); padding: 40px; border-radius: var(--radius-lg); min-height: 400px; display: flex; align-items: center; justify-content: center; font-size: 8rem; color: var(--color-primary); }
.product-info h1 { margin-bottom: 8px; }
.product-meta { display: flex; flex-wrap: wrap; gap: 16px; margin-bottom: 24px; padding: 16px 0; border-bottom: 1px solid var(--color-border); color: var(--color-text-light); font-size: 0.9rem; }
.product-meta span strong { color: var(--color-text); }
.product-description { margin: 24px 0; }
.product-features { margin: 24px 0; padding: 24px; background: var(--color-bg-alt); border-radius: var(--radius); }
.product-features h4 { margin-bottom: 16px; }
.product-features ul { margin: 0; }
.product-features li { margin-bottom: 8px; list-style: none; padding-left: 24px; position: relative; }
.product-features li::before { content: '✓'; position: absolute; left: 0; color: var(--color-accent); font-weight: bold; }

/* ---------------- News ---------------- */
.news-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.news-card {
    background: #fff; border: 1px solid var(--color-border); border-radius: var(--radius-lg); overflow: hidden; transition: var(--transition);
}
.news-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.news-image { height: 180px; background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); }
.news-body { padding: 24px; }
.news-date { color: var(--color-text-light); font-size: 0.85rem; margin-bottom: 8px; }
.news-body h4 { margin-bottom: 12px; line-height: 1.4; }
.news-body h4 a { color: var(--color-dark); }
.news-body h4 a:hover { color: var(--color-primary); }
.news-body p { color: var(--color-text-light); font-size: 0.9rem; margin-bottom: 16px; }

/* ---------------- Breadcrumb ---------------- */
.breadcrumb-wrap { background: var(--color-bg-alt); padding: 20px 0; border-bottom: 1px solid var(--color-border); }
.breadcrumb { display: flex; flex-wrap: wrap; list-style: none; margin: 0; padding: 0; font-size: 0.9rem; }
.breadcrumb li { display: flex; align-items: center; color: var(--color-text-light); }
.breadcrumb li::after { content: '/'; margin: 0 10px; opacity: 0.4; }
.breadcrumb li:last-child::after { display: none; }
.breadcrumb li:last-child { color: var(--color-text); font-weight: 500; }
.breadcrumb li a { color: var(--color-primary); }

/* ---------------- Forms ---------------- */
.form-group { margin-bottom: 20px; }
.form-label { display: block; margin-bottom: 8px; font-weight: 500; font-size: 0.9rem; color: var(--color-dark-2); }
.form-control {
    width: 100%; padding: 10px 14px; font-size: 0.95rem; border: 1px solid var(--color-border);
    border-radius: var(--radius); background: #fff; transition: var(--transition);
    font-family: inherit; color: var(--color-text);
}
.form-control:focus { outline: none; border-color: var(--color-primary); box-shadow: 0 0 0 3px rgba(26, 92, 168, 0.1); }
textarea.form-control { min-height: 120px; resize: vertical; }
select.form-control { cursor: pointer; }

/* ---------------- Contact ---------------- */
.contact-wrap { display: grid; grid-template-columns: 1fr 1.5fr; gap: 48px; }
.contact-info-box { background: linear-gradient(135deg, var(--color-primary), var(--color-accent)); color: #fff; padding: 40px; border-radius: var(--radius-lg); }
.contact-info-box h3 { color: #fff; margin-bottom: 24px; }
.contact-item { display: flex; gap: 16px; margin-bottom: 24px; align-items: flex-start; }
.contact-icon { width: 40px; height: 40px; background: rgba(255,255,255,0.15); border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 1.1rem; flex-shrink: 0; }
.contact-item strong { display: block; margin-bottom: 4px; }
.contact-item span { opacity: 0.9; font-size: 0.9rem; }
.contact-form { background: #fff; padding: 40px; border: 1px solid var(--color-border); border-radius: var(--radius-lg); }

/* ---------------- Alerts / Flash ---------------- */
.alert {
    padding: 14px 18px; border-radius: var(--radius); margin-bottom: 20px;
    border: 1px solid transparent; font-size: 0.95rem;
}
.alert-success { background: #d1fae5; color: #065f46; border-color: #a7f3d0; }
.alert-error { background: #fee2e2; color: #991b1b; border-color: #fecaca; }
.alert-warning { background: #fef3c7; color: #92400e; border-color: #fde68a; }
.alert-info { background: #dbeafe; color: #1e40af; border-color: #bfdbfe; }

/* ---------------- Footer ---------------- */
.site-footer { background: var(--color-dark); color: #cbd5e1; margin-top: 80px; }
.footer-top { padding: 60px 0 40px; border-bottom: 1px solid rgba(255,255,255,0.08); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; }
.footer-col h4 { color: #fff; font-size: 1rem; margin-bottom: 20px; }
.footer-col p { font-size: 0.9rem; color: #94a3b8; margin-bottom: 16px; }
.footer-col ul { list-style: none; margin: 0; padding: 0; }
.footer-col ul li { margin-bottom: 10px; }
.footer-col ul li a { color: #94a3b8; font-size: 0.9rem; }
.footer-col ul li a:hover { color: #fff; }
.footer-col .logo { color: #fff; margin-bottom: 16px; }
.footer-contact { font-size: 0.9rem; }
.footer-contact p { margin-bottom: 8px; color: #94a3b8; }

.footer-bottom { padding: 20px 0; font-size: 0.85rem; color: #94a3b8; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px; }

/* ---------------- Utilities ---------------- */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-muted { color: var(--color-text-light); }
.text-primary { color: var(--color-primary); }
.text-white { color: #fff; }
.bg-light { background: var(--color-bg-alt); }
.mt-0 { margin-top: 0 !important; } .mb-0 { margin-bottom: 0 !important; }
.mt-1 { margin-top: 8px; } .mb-1 { margin-bottom: 8px; }
.mt-2 { margin-top: 16px; } .mb-2 { margin-bottom: 16px; }
.mt-3 { margin-top: 24px; } .mb-3 { margin-bottom: 24px; }
.mt-4 { margin-top: 32px; } .mb-4 { margin-bottom: 32px; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.flex-center { display: flex; justify-content: center; align-items: center; }
.gap-2 { gap: 8px; }
.gap-3 { gap: 16px; }

/* ---------------- Responsive ---------------- */
@media (max-width: 1024px) {
    .feature-cards, .category-grid { grid-template-columns: repeat(2, 1fr); }
    .product-grid { grid-template-columns: repeat(2, 1fr); }
    .news-grid { grid-template-columns: repeat(2, 1fr); }
    .footer-grid { grid-template-columns: 1fr 1fr; }
    .product-layout { grid-template-columns: 1fr; }
    .sidebar { position: static; }
    .contact-wrap { grid-template-columns: 1fr; }
    .product-detail { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
    .section { padding: 50px 0; }
    h1 { font-size: 1.75rem; }
    h2 { font-size: 1.5rem; }
    .main-nav { display: none; }
    .hero-content { padding: 60px 0; }
    .hero-content h1 { font-size: 2rem; }
    .feature-cards, .category-grid, .product-grid, .news-grid { grid-template-columns: 1fr; }
    .footer-grid { grid-template-columns: 1fr; }
    .search-box input { width: 140px; }
}