/* =============================================================================
   metaltavan.com - Design System
   Professional Metal Ceiling Systems Platform
   ============================================================================= */

/* --- CSS Custom Properties (Design Tokens) --- */
:root {
    /* Colors - Premium Navy & Blue palette */
    --color-primary: #1e3a5f;
    --color-primary-light: #2563eb;
    --color-primary-dark: #0f1f3a;
    --color-accent: #3b82f6;
    --color-accent-light: #60a5fa;
    --color-secondary: #64748b;
    --color-success: #10b981;
    --color-warning: #f59e0b;
    --color-error: #ef4444;
    --color-whatsapp: #25d366;

    /* Neutrals */
    --color-white: #ffffff;
    --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-gray-800: #1e293b;
    --color-gray-900: #0f172a;
    --color-black: #020617;

    /* Typography */
    --font-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-arabic: 'Noto Sans Arabic', 'Inter', sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 1.875rem;
    --font-size-4xl: 2.25rem;
    --font-size-5xl: 3rem;
    --font-size-6xl: 3.75rem;

    /* Spacing */
    --space-1: 0.25rem;
    --space-2: 0.5rem;
    --space-3: 0.75rem;
    --space-4: 1rem;
    --space-5: 1.25rem;
    --space-6: 1.5rem;
    --space-8: 2rem;
    --space-10: 2.5rem;
    --space-12: 3rem;
    --space-16: 4rem;
    --space-20: 5rem;
    --space-24: 6rem;

    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-full: 9999px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -2px rgba(0,0,0,0.05);
    --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -4px rgba(0,0,0,0.04);
    --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0,0,0,0.15);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;

    /* Layout */
    --header-height: 72px;
    --container-max: 1280px;
    --container-sm: 768px;
}

/* --- Reset & Base --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; font-size: 16px; }
body {
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--color-gray-800);
    background-color: var(--color-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
}
body.rtl { font-family: var(--font-arabic); direction: rtl; }
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-primary-light); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: var(--color-accent); }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }

/* --- Skip Link (Accessibility) --- */
.skip-link {
    position: absolute; top: -100%; left: var(--space-4);
    background: var(--color-primary); color: var(--color-white);
    padding: var(--space-2) var(--space-4); border-radius: var(--radius-md);
    z-index: 10000; font-size: var(--font-size-sm);
}
.skip-link:focus { top: var(--space-4); }

/* --- Container --- */
.section-container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6); }
.header-container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6); display: flex; align-items: center; justify-content: space-between; height: var(--header-height); }

/* =============================================================================
   HEADER
   ============================================================================= */
.site-header {
    position: sticky; top: 0; z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-gray-200);
    transition: box-shadow var(--transition-base);
}
.site-header.scrolled { box-shadow: var(--shadow-lg); }

/* Logo */
.header-logo { display: flex; align-items: center; gap: var(--space-3); text-decoration: none; }
.logo-text { display: flex; align-items: baseline; }
.logo-brand { font-size: var(--font-size-xl); font-weight: 800; color: var(--color-primary); letter-spacing: -0.5px; }
.logo-tld { font-size: var(--font-size-xl); font-weight: 800; color: var(--color-primary-light); }

/* Navigation */
.header-nav { display: none; }
@media (min-width: 1024px) { .header-nav { display: block; } }
.nav-list { display: flex; align-items: center; gap: var(--space-1); }
.nav-link {
    padding: var(--space-2) var(--space-3); font-size: var(--font-size-sm); font-weight: 500;
    color: var(--color-gray-700); border-radius: var(--radius-md); transition: all var(--transition-fast);
    display: flex; align-items: center; gap: var(--space-1);
}
.nav-link:hover { color: var(--color-primary-light); background: var(--color-gray-50); }

/* Dropdown */
.nav-dropdown { position: relative; }
.dropdown-menu {
    position: absolute; top: 100%; left: 50%; transform: translateX(-50%);
    min-width: 320px; background: var(--color-white); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl); border: 1px solid var(--color-gray-200);
    padding: var(--space-2); opacity: 0; visibility: hidden;
    transition: all var(--transition-base); pointer-events: none; margin-top: var(--space-2);
}
.nav-dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; pointer-events: auto; }
.dropdown-grid { display: grid; grid-template-columns: 1fr 1fr; gap: var(--space-1); }
.dropdown-item {
    padding: var(--space-2) var(--space-3); border-radius: var(--radius-md);
    font-size: var(--font-size-sm); color: var(--color-gray-700); transition: all var(--transition-fast);
}
.dropdown-item:hover { background: var(--color-gray-50); color: var(--color-primary-light); }
.dropdown-item-all { grid-column: 1 / -1; font-weight: 600; color: var(--color-primary-light); border-top: 1px solid var(--color-gray-100); margin-top: var(--space-1); padding-top: var(--space-3); }
.dropdown-arrow { transition: transform var(--transition-fast); }

/* Header Actions */
.header-actions { display: flex; align-items: center; gap: var(--space-3); }

/* Language Switcher */
.lang-switcher { position: relative; }
.lang-current {
    display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3);
    font-size: var(--font-size-sm); font-weight: 500; color: var(--color-gray-700);
    border: 1px solid var(--color-gray-200); border-radius: var(--radius-md);
    background: var(--color-white); transition: all var(--transition-fast); cursor: pointer;
}
.lang-current:hover { border-color: var(--color-gray-300); }
.lang-dropdown {
    position: absolute; top: calc(100% + var(--space-2)); right: 0; min-width: 180px;
    background: var(--color-white); border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl); border: 1px solid var(--color-gray-200);
    padding: var(--space-2); opacity: 0; visibility: hidden;
    transition: all var(--transition-base); pointer-events: none; z-index: 100;
}
.lang-switcher.open .lang-dropdown { opacity: 1; visibility: visible; pointer-events: auto; }
.lang-option {
    display: flex; align-items: center; gap: var(--space-3); padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md); font-size: var(--font-size-sm); color: var(--color-gray-700);
    transition: all var(--transition-fast);
}
.lang-option:hover { background: var(--color-gray-50); }
.lang-option.active { background: var(--color-gray-100); font-weight: 600; color: var(--color-primary); }
.lang-flag { font-size: 1.2em; }
.lang-code { font-weight: 600; text-transform: uppercase; }

/* CTA Button */
.header-cta {
    display: none; padding: var(--space-2) var(--space-5);
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white); font-size: var(--font-size-sm); font-weight: 600;
    border-radius: var(--radius-full); transition: all var(--transition-base); white-space: nowrap;
}
.header-cta:hover { transform: translateY(-1px); box-shadow: var(--shadow-lg); color: var(--color-white); }
@media (min-width: 1024px) { .header-cta { display: inline-flex; } }

/* Mobile Toggle */
.mobile-toggle { display: flex; flex-direction: column; gap: 5px; padding: var(--space-2); }
.hamburger-line { width: 22px; height: 2px; background: var(--color-gray-700); border-radius: 2px; transition: all var(--transition-base); }
.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(2) { opacity: 0; }
.mobile-toggle[aria-expanded="true"] .hamburger-line:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
@media (min-width: 1024px) { .mobile-toggle { display: none; } }

/* Mobile Menu */
.mobile-menu {
    position: fixed; top: var(--header-height); left: 0; right: 0; bottom: 0;
    background: var(--color-white); padding: var(--space-6);
    transform: translateX(100%); transition: transform var(--transition-slow);
    overflow-y: auto; z-index: 999;
}
.mobile-menu.open { transform: translateX(0); }
.mobile-nav-list { display: flex; flex-direction: column; gap: var(--space-2); }
.mobile-nav-link {
    display: block; padding: var(--space-3) var(--space-4); font-size: var(--font-size-lg);
    font-weight: 500; color: var(--color-gray-800); border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}
.mobile-nav-link:hover { background: var(--color-gray-50); color: var(--color-primary-light); }
.mobile-lang { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-top: var(--space-6); padding-top: var(--space-6); border-top: 1px solid var(--color-gray-200); }
.mobile-lang-item {
    display: flex; align-items: center; gap: var(--space-2); padding: var(--space-2) var(--space-3);
    border: 1px solid var(--color-gray-200); border-radius: var(--radius-md);
    font-size: var(--font-size-sm); color: var(--color-gray-600);
}
.mobile-lang-item.active { border-color: var(--color-primary-light); background: rgba(37,99,235,0.05); color: var(--color-primary); font-weight: 600; }
.mobile-cta {
    display: block; text-align: center; margin-top: var(--space-6);
    padding: var(--space-4); background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white); font-weight: 600; border-radius: var(--radius-lg);
}

/* =============================================================================
   HERO SECTION
   ============================================================================= */
.hero {
    position: relative; min-height: 85vh; display: flex; align-items: center;
    background: linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 50%, #1a365d 100%);
    overflow: hidden;
}
.hero-background { position: absolute; inset: 0; z-index: 0; }
.hero-gradient {
    position: absolute; inset: 0;
    background: radial-gradient(ellipse at 30% 50%, rgba(37,99,235,0.3) 0%, transparent 70%),
                radial-gradient(ellipse at 70% 80%, rgba(59,130,246,0.2) 0%, transparent 60%);
}
.hero-pattern {
    position: absolute; inset: 0; opacity: 0.05;
    background-image: repeating-linear-gradient(0deg, transparent, transparent 50px, rgba(255,255,255,0.1) 50px, rgba(255,255,255,0.1) 51px),
                       repeating-linear-gradient(90deg, transparent, transparent 50px, rgba(255,255,255,0.1) 50px, rgba(255,255,255,0.1) 51px);
}
.hero-container { position: relative; z-index: 1; max-width: var(--container-max); margin: 0 auto; padding: var(--space-16) var(--space-6); width: 100%; }
.hero-content { max-width: 720px; }
.hero-title {
    font-size: clamp(var(--font-size-3xl), 5vw, var(--font-size-6xl));
    font-weight: 900; color: var(--color-white); line-height: 1.1;
    letter-spacing: -1px; margin-bottom: var(--space-6);
    animation: fadeInUp 0.8s ease;
}
.hero-subtitle {
    font-size: clamp(var(--font-size-lg), 2vw, var(--font-size-xl));
    color: rgba(255,255,255,0.8); line-height: 1.7; margin-bottom: var(--space-8);
    animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: var(--space-4); animation: fadeInUp 0.8s ease 0.4s both; }

/* Stats */
.hero-stats {
    display: grid; grid-template-columns: repeat(2, 1fr); gap: var(--space-6);
    margin-top: var(--space-12); padding-top: var(--space-8);
    border-top: 1px solid rgba(255,255,255,0.15);
    animation: fadeInUp 0.8s ease 0.6s both;
}
@media (min-width: 768px) { .hero-stats { grid-template-columns: repeat(4, 1fr); } }
.stat-item { text-align: center; }
.stat-number { font-size: var(--font-size-4xl); font-weight: 800; color: var(--color-white); display: block; }
.stat-suffix { font-size: var(--font-size-2xl); font-weight: 700; color: var(--color-accent-light); }
.stat-label { font-size: var(--font-size-sm); color: rgba(255,255,255,0.7); margin-top: var(--space-1); display: block; }

/* =============================================================================
   BUTTONS
   ============================================================================= */
.btn {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
    padding: var(--space-3) var(--space-6); font-weight: 600; font-size: var(--font-size-sm);
    border-radius: var(--radius-lg); transition: all var(--transition-base);
    cursor: pointer; border: 2px solid transparent; white-space: nowrap;
}
.btn-lg { padding: var(--space-4) var(--space-8); font-size: var(--font-size-base); }
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-primary-light));
    color: var(--color-white); border-color: transparent;
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(30,58,95,0.35); color: var(--color-white); }
.btn-outline { background: transparent; color: var(--color-white); border-color: rgba(255,255,255,0.4); }
.btn-outline:hover { background: rgba(255,255,255,0.1); color: var(--color-white); border-color: rgba(255,255,255,0.7); }
.btn-white { background: var(--color-white); color: var(--color-primary); }
.btn-white:hover { transform: translateY(-2px); box-shadow: var(--shadow-xl); color: var(--color-primary); }
.btn-whatsapp { background: var(--color-whatsapp); color: var(--color-white); }
.btn-whatsapp:hover { background: #20bd5a; transform: translateY(-2px); box-shadow: 0 8px 25px rgba(37,211,102,0.35); color: var(--color-white); }
.btn-block { display: flex; width: 100%; }

/* =============================================================================
   SECTIONS
   ============================================================================= */
.section-header { text-align: center; max-width: 700px; margin: 0 auto var(--space-12); }
.section-title {
    font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-4xl));
    font-weight: 800; color: var(--color-gray-900); letter-spacing: -0.5px;
    margin-bottom: var(--space-4);
}
.section-subtitle { font-size: var(--font-size-lg); color: var(--color-gray-500); line-height: 1.7; }

.products-section { padding: var(--space-20) 0; background: var(--color-gray-50); }
.page-section { padding: var(--space-16) 0; }

/* =============================================================================
   PRODUCT CARDS
   ============================================================================= */
.products-grid {
    display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: var(--space-6);
}
.products-grid-sm { grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); }
.product-card {
    background: var(--color-white); border-radius: var(--radius-xl);
    overflow: hidden; box-shadow: var(--shadow-sm); border: 1px solid var(--color-gray-100);
    transition: all var(--transition-base);
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-xl); border-color: var(--color-gray-200); }
.product-card-link { display: block; color: inherit; }
.product-card-image {
    aspect-ratio: 4/3; overflow: hidden; background: var(--color-gray-100);
    display: flex; align-items: center; justify-content: center;
}
.product-card-image img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.product-card:hover .product-card-image img { transform: scale(1.05); }
.product-card-placeholder { display: flex; align-items: center; justify-content: center; width: 100%; height: 100%; background: linear-gradient(135deg, var(--color-gray-100), var(--color-gray-200)); }
.product-card-body { padding: var(--space-5); }
.product-card-title { font-size: var(--font-size-lg); font-weight: 700; color: var(--color-gray-900); margin-bottom: var(--space-2); line-height: 1.3; }
.product-card-desc { font-size: var(--font-size-sm); color: var(--color-gray-500); line-height: 1.6; margin-bottom: var(--space-3); }
.product-card-cta {
    display: inline-flex; align-items: center; gap: var(--space-2);
    font-size: var(--font-size-sm); font-weight: 600; color: var(--color-primary-light);
}
.products-empty { text-align: center; padding: var(--space-16); color: var(--color-gray-400); }

/* =============================================================================
   CTA SECTION
   ============================================================================= */
.cta-section {
    padding: var(--space-20) 0;
    background: linear-gradient(135deg, var(--color-primary-dark), var(--color-primary), var(--color-primary-light));
    text-align: center;
}
.cta-content { max-width: 600px; margin: 0 auto; }
.cta-title { font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-4xl)); font-weight: 800; color: var(--color-white); margin-bottom: var(--space-4); }
.cta-desc { font-size: var(--font-size-lg); color: rgba(255,255,255,0.8); margin-bottom: var(--space-8); }
.cta-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-4); }

/* =============================================================================
   FOOTER
   ============================================================================= */
.site-footer { background: var(--color-gray-900); color: var(--color-gray-400); padding: var(--space-16) 0 0; }
.footer-container { max-width: var(--container-max); margin: 0 auto; padding: 0 var(--space-6); }
.footer-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-10); padding-bottom: var(--space-12); border-bottom: 1px solid rgba(255,255,255,0.1); }
@media (min-width: 768px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1024px) { .footer-grid { grid-template-columns: 2fr 1fr 1fr 1.5fr; } }
.footer-logo { display: inline-flex; align-items: center; gap: var(--space-3); margin-bottom: var(--space-4); }
.footer-logo .logo-brand { color: var(--color-white); }
.footer-logo .logo-tld { color: var(--color-accent-light); }
.footer-desc { font-size: var(--font-size-sm); line-height: 1.7; margin-bottom: var(--space-4); }
.footer-heading { font-size: var(--font-size-base); font-weight: 700; color: var(--color-white); margin-bottom: var(--space-4); }
.footer-links { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-links a { font-size: var(--font-size-sm); color: var(--color-gray-400); transition: color var(--transition-fast); }
.footer-links a:hover { color: var(--color-white); }
.footer-contact-info { display: flex; flex-direction: column; gap: var(--space-2); }
.footer-contact-link { display: flex; align-items: center; gap: var(--space-2); font-size: var(--font-size-sm); color: var(--color-gray-400); }
.footer-contact-link:hover { color: var(--color-white); }
.footer-address { font-size: var(--font-size-sm); margin-bottom: var(--space-4); }
.footer-cta-group { display: flex; flex-direction: column; gap: var(--space-3); margin-top: var(--space-4); }
.footer-whatsapp, .footer-call {
    display: inline-flex; align-items: center; justify-content: center; gap: var(--space-2);
    padding: var(--space-3) var(--space-4); border-radius: var(--radius-lg);
    font-size: var(--font-size-sm); font-weight: 600; transition: all var(--transition-base); text-align: center;
}
.footer-whatsapp { background: var(--color-whatsapp); color: var(--color-white); }
.footer-whatsapp:hover { background: #20bd5a; color: var(--color-white); }
.footer-call { border: 1px solid rgba(255,255,255,0.2); color: var(--color-white); }
.footer-call:hover { border-color: rgba(255,255,255,0.5); }
.footer-bottom { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: center; gap: var(--space-4); padding: var(--space-6) 0; }
.footer-copyright { font-size: var(--font-size-sm); }
.footer-legal { display: flex; gap: var(--space-3); font-size: var(--font-size-sm); }
.footer-legal a { color: var(--color-gray-400); }
.footer-legal a:hover { color: var(--color-white); }
.footer-divider { color: var(--color-gray-600); }

/* =============================================================================
   FLOATING ELEMENTS
   ============================================================================= */
.whatsapp-float {
    position: fixed; bottom: var(--space-6); right: var(--space-6); z-index: 900;
    width: 56px; height: 56px; border-radius: var(--radius-full);
    background: var(--color-whatsapp); color: var(--color-white);
    display: flex; align-items: center; justify-content: center;
    box-shadow: 0 4px 20px rgba(37,211,102,0.4);
    transition: all var(--transition-base); animation: pulse-green 2s infinite;
}
.whatsapp-float:hover { transform: scale(1.1); box-shadow: 0 6px 30px rgba(37,211,102,0.5); color: var(--color-white); }
.back-to-top {
    position: fixed; bottom: var(--space-6); right: calc(var(--space-6) + 70px); z-index: 900;
    width: 44px; height: 44px; border-radius: var(--radius-full);
    background: var(--color-white); color: var(--color-gray-600);
    display: flex; align-items: center; justify-content: center;
    box-shadow: var(--shadow-lg); border: 1px solid var(--color-gray-200);
    opacity: 0; visibility: hidden; transition: all var(--transition-base);
}
.back-to-top.visible { opacity: 1; visibility: visible; }
.back-to-top:hover { background: var(--color-gray-50); color: var(--color-primary); }

/* =============================================================================
   PRODUCT DETAIL
   ============================================================================= */
.breadcrumbs { padding: var(--space-4) 0; background: var(--color-gray-50); border-bottom: 1px solid var(--color-gray-200); }
.breadcrumb-list { display: flex; flex-wrap: wrap; align-items: center; gap: var(--space-1); font-size: var(--font-size-sm); }
.breadcrumb-item { display: flex; align-items: center; gap: var(--space-1); color: var(--color-gray-500); }
.breadcrumb-item:not(:last-child)::after { content: '/'; margin-left: var(--space-1); color: var(--color-gray-300); }
.breadcrumb-item a { color: var(--color-gray-500); }
.breadcrumb-item a:hover { color: var(--color-primary-light); }
.breadcrumb-item:last-child { color: var(--color-gray-800); font-weight: 500; }

.product-detail { padding: var(--space-12) 0; }
.product-layout { display: grid; grid-template-columns: 1fr; gap: var(--space-10); margin-bottom: var(--space-12); }
@media (min-width: 768px) { .product-layout { grid-template-columns: 1fr 1fr; } }
.product-main-image { border-radius: var(--radius-xl); overflow: hidden; background: var(--color-gray-100); aspect-ratio: 4/3; }
.product-main-image img { width: 100%; height: 100%; object-fit: cover; }
.product-main-image .product-card-placeholder.large { aspect-ratio: 4/3; }
.product-thumbnails { display: flex; gap: var(--space-2); margin-top: var(--space-3); overflow-x: auto; }
.product-thumb { width: 80px; height: 60px; border-radius: var(--radius-md); overflow: hidden; border: 2px solid var(--color-gray-200); cursor: pointer; transition: border-color var(--transition-fast); flex-shrink: 0; }
.product-thumb:hover, .product-thumb.active { border-color: var(--color-primary-light); }
.product-thumb img { width: 100%; height: 100%; object-fit: cover; }
.product-title { font-size: clamp(var(--font-size-2xl), 3vw, var(--font-size-4xl)); font-weight: 800; color: var(--color-gray-900); margin-bottom: var(--space-4); }
.product-short-desc { font-size: var(--font-size-lg); color: var(--color-gray-500); line-height: 1.7; margin-bottom: var(--space-6); }
.product-quick-specs { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-6); }
.spec-tag { background: var(--color-gray-100); padding: var(--space-2) var(--space-3); border-radius: var(--radius-md); font-size: var(--font-size-sm); }
.spec-key { font-weight: 600; color: var(--color-gray-700); }
.spec-value { color: var(--color-gray-500); }
.product-actions { display: flex; flex-wrap: wrap; gap: var(--space-3); margin-top: var(--space-6); }

/* Product Tabs */
.product-tabs { margin-top: var(--space-12); }
.tabs-nav { display: flex; gap: var(--space-1); border-bottom: 2px solid var(--color-gray-200); overflow-x: auto; }
.tab-btn {
    padding: var(--space-3) var(--space-5); font-size: var(--font-size-sm); font-weight: 500;
    color: var(--color-gray-500); border-bottom: 2px solid transparent;
    margin-bottom: -2px; transition: all var(--transition-fast); white-space: nowrap;
}
.tab-btn:hover { color: var(--color-gray-700); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary-light); font-weight: 600; }
.tab-pane { display: none; padding: var(--space-8) 0; }
.tab-pane.active { display: block; }
.product-description { font-size: var(--font-size-base); line-height: 1.8; color: var(--color-gray-700); }
.specs-table { width: 100%; border-collapse: collapse; }
.specs-table th, .specs-table td { padding: var(--space-3) var(--space-4); text-align: left; border-bottom: 1px solid var(--color-gray-200); font-size: var(--font-size-sm); }
.specs-table th { font-weight: 600; color: var(--color-gray-700); width: 40%; background: var(--color-gray-50); }
.specs-table td { color: var(--color-gray-600); }
.use-cases-list, .features-list { display: flex; flex-direction: column; gap: var(--space-3); }
.use-cases-list li, .features-list li { padding-left: var(--space-6); position: relative; font-size: var(--font-size-base); color: var(--color-gray-700); }
.use-cases-list li::before, .features-list li::before { content: '✓'; position: absolute; left: 0; color: var(--color-success); font-weight: 700; }
.related-products { margin-top: var(--space-16); padding-top: var(--space-12); border-top: 1px solid var(--color-gray-200); }

/* =============================================================================
   CONTACT FORM
   ============================================================================= */
.contact-layout { display: grid; grid-template-columns: 1fr; gap: var(--space-10); }
@media (min-width: 768px) { .contact-layout { grid-template-columns: 1.5fr 1fr; } }
.form-grid { display: grid; grid-template-columns: 1fr; gap: var(--space-4); }
@media (min-width: 640px) { .form-grid { grid-template-columns: 1fr 1fr; } }
.form-group { display: flex; flex-direction: column; gap: var(--space-2); }
.form-group-full { grid-column: 1 / -1; }
.form-group label { font-size: var(--font-size-sm); font-weight: 600; color: var(--color-gray-700); }
.form-group input, .form-group textarea {
    padding: var(--space-3) var(--space-4); border: 1px solid var(--color-gray-300);
    border-radius: var(--radius-lg); font-size: var(--font-size-base);
    transition: all var(--transition-fast); background: var(--color-white);
}
.form-group input:focus, .form-group textarea:focus { outline: none; border-color: var(--color-primary-light); box-shadow: 0 0 0 3px rgba(37,99,235,0.1); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-submit { margin-top: var(--space-4); }
.form-messages { margin-top: var(--space-4); font-size: var(--font-size-sm); }
.form-messages.success { color: var(--color-success); }
.form-messages.error { color: var(--color-error); }
.form-product-notice { background: var(--color-gray-50); padding: var(--space-3) var(--space-4); border-radius: var(--radius-md); margin-bottom: var(--space-4); border-left: 3px solid var(--color-primary-light); }
.contact-info-card { background: var(--color-gray-50); padding: var(--space-8); border-radius: var(--radius-xl); }
.contact-info-card h2 { font-size: var(--font-size-xl); font-weight: 700; margin-bottom: var(--space-6); }
.contact-item { display: flex; gap: var(--space-3); margin-bottom: var(--space-5); font-size: var(--font-size-sm); }
.contact-item a { color: var(--color-gray-700); }
.contact-item a:hover { color: var(--color-primary-light); }
.contact-cta-group { margin-top: var(--space-6); }

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item { border-bottom: 1px solid var(--color-gray-200); }
.faq-question {
    width: 100%; display: flex; justify-content: space-between; align-items: center;
    padding: var(--space-5) 0; font-size: var(--font-size-lg); font-weight: 600;
    color: var(--color-gray-800); text-align: left; cursor: pointer; gap: var(--space-4);
}
.faq-icon { transition: transform var(--transition-base); flex-shrink: 0; }
.faq-item.open .faq-icon { transform: rotate(180deg); }
.faq-answer { max-height: 0; overflow: hidden; transition: max-height var(--transition-slow); }
.faq-answer p { padding-bottom: var(--space-5); color: var(--color-gray-600); line-height: 1.7; }
.faq-item.open .faq-answer { max-height: 500px; }

/* Gallery */
.gallery-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--space-4); }
.gallery-item { position: relative; border-radius: var(--radius-xl); overflow: hidden; aspect-ratio: 4/3; cursor: pointer; }
.gallery-item img { width: 100%; height: 100%; object-fit: cover; transition: transform var(--transition-slow); }
.gallery-item:hover img { transform: scale(1.05); }
.gallery-overlay {
    position: absolute; inset: 0; background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
    display: flex; align-items: flex-end; padding: var(--space-4); opacity: 0; transition: opacity var(--transition-base);
}
.gallery-item:hover .gallery-overlay { opacity: 1; }
.gallery-caption { color: var(--color-white); font-weight: 600; }

/* About */
.about-content { max-width: 800px; margin: 0 auto; }
.about-text { font-size: var(--font-size-lg); line-height: 1.8; color: var(--color-gray-600); margin-bottom: var(--space-12); text-align: center; }
.about-stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-6); margin-bottom: var(--space-12); }
.about-cta { text-align: center; }

/* Error Page */
.error-page { display: flex; align-items: center; justify-content: center; min-height: 60vh; text-align: center; padding: var(--space-16) var(--space-6); }
.error-code { font-size: 8rem; font-weight: 900; color: var(--color-gray-200); line-height: 1; }
.error-title { font-size: var(--font-size-3xl); font-weight: 700; color: var(--color-gray-800); margin-top: var(--space-4); }
.error-desc { font-size: var(--font-size-lg); color: var(--color-gray-500); margin: var(--space-4) 0 var(--space-8); }
.error-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: var(--space-4); }
.no-content { text-align: center; color: var(--color-gray-400); padding: var(--space-12); }

/* =============================================================================
   ANIMATIONS
   ============================================================================= */
@keyframes fadeInUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}
@keyframes pulse-green {
    0%, 100% { box-shadow: 0 4px 20px rgba(37,211,102,0.4); }
    50% { box-shadow: 0 4px 30px rgba(37,211,102,0.6); }
}