/* ==========================================================================
   IGEN AERO TECH — Global Theme (Black & White, Dark/Light)
   ========================================================================== */

:root,
[data-theme="dark"] {
    --bg: #0a0a0a;
    --bg-alt: #111111;
    --bg-elevated: #1a1a1a;
    --surface: #161616;
    --surface-hover: #222222;
    --border: #2a2a2a;
    --border-strong: #3a3a3a;
    --text: #f5f5f5;
    --text-muted: #b0b0b0;
    --text-dim: #777777;
    --header-bg: rgba(10, 10, 10, 0.92);
    --header-border: rgba(255, 255, 255, 0.08);
    --footer-bg: #050505;
    --footer-border: #1a1a1a;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.7);
    --input-bg: #151515;
    --input-border: #2a2a2a;
    --btn-bg: #ffffff;
    --btn-text: #0a0a0a;
    --btn-bg-hover: #e0e0e0;
}

[data-theme="light"] {
    --bg: #fafafa;
    --bg-alt: #f0f0f0;
    --bg-elevated: #ffffff;
    --surface: #ffffff;
    --surface-hover: #f5f5f5;
    --border: #e0e0e0;
    --border-strong: #cccccc;
    --text: #0a0a0a;
    --text-muted: #444444;
    --text-dim: #888888;
    --header-bg: rgba(255, 255, 255, 0.92);
    --header-border: rgba(0, 0, 0, 0.08);
    --footer-bg: #0a0a0a;
    --footer-border: #1a1a1a;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 15px 40px rgba(0, 0, 0, 0.15);
    --input-bg: #ffffff;
    --input-border: #dddddd;
    --btn-bg: #0a0a0a;
    --btn-text: #ffffff;
    --btn-bg-hover: #333333;
}

html { transition: background-color 0.4s ease, color 0.4s ease; }
body, body * { transition: background-color 0.35s ease, color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease; }

body {
    background-color: var(--bg) !important;
    color: var(--text) !important;
}

h1, h2, h3, h4, h5, h6 { color: var(--text) !important; }
p, li { color: var(--text-muted) !important; }
a { color: inherit; }

/* ===== HEADER ===== */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background-color: var(--header-bg) !important;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--header-border);
    z-index: 1000;
    box-shadow: 0 1px 0 var(--header-border);
}

.site-header .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 20px;
    max-width: 1400px;
    margin: 0 auto;
}

.site-header .logo {
    display: inline-flex;
    align-items: center;
    cursor: pointer;
    text-decoration: none;
}

.site-header .logo-image {
    height: 50px;
    width: auto;
    max-height: 55px;
    display: block;
}

.site-header .logo-text {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 1.3rem;
    letter-spacing: 1px;
    color: var(--text) !important;
    margin-left: 10px;
}

.site-header .logo-text span { color: var(--text-muted); }

.site-header .main-nav ul {
    display: flex;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: 6px;
}

.site-header .main-nav ul li a {
    display: inline-block;
    padding: 8px 14px;
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
    font-weight: 500;
    letter-spacing: 0.3px;
    color: var(--text) !important;
    border-radius: 6px;
    position: relative;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.25s ease;
}

.site-header .main-nav ul li a:hover,
.site-header .main-nav ul li a.active {
    background-color: var(--surface-hover);
}

.site-header .main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: 2px;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 2px;
    background-color: var(--text);
    transition: width 0.25s ease;
}

.site-header .main-nav ul li a:hover::after,
.site-header .main-nav ul li a.active::after { width: 24px; }

.site-header .nav-icons {
    display: flex;
    align-items: center;
    gap: 14px;
}

.site-header .mobile-menu-btn {
    display: none;
    font-size: 1.3rem;
    cursor: pointer;
    color: var(--text);
    padding: 6px;
    background: none;
    border: none;
}

.site-header .close-nav {
    display: none;
    font-size: 1.5rem;
    cursor: pointer;
    position: absolute;
    top: 20px;
    right: 20px;
    color: var(--text);
}

/* ===== ANIMATED SUN/MOON TOGGLE ===== */
.theme-switch {
    position: relative;
    display: inline-block;
    width: 62px;
    height: 30px;
    cursor: pointer;
    flex-shrink: 0;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
    position: absolute;
}

.theme-switch-slider {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, #1a1a2e 0%, #0f1419 100%);
    border-radius: 30px;
    border: 1px solid var(--border-strong);
    overflow: hidden;
    transition: background 0.4s ease, border-color 0.4s ease;
}

[data-theme="light"] .theme-switch-slider {
    background: linear-gradient(135deg, #87ceeb 0%, #4a90e2 100%);
}

.theme-switch-icon {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    font-size: 0.75rem;
    transition: opacity 0.35s ease, transform 0.4s ease;
    pointer-events: none;
}

.theme-switch-sun {
    left: 8px;
    color: #ffd54a;
    opacity: 0;
    transform: translateY(-50%) scale(0.5) rotate(-90deg);
}

.theme-switch-moon {
    right: 8px;
    color: #e8e8e8;
    opacity: 1;
    transform: translateY(-50%) scale(1) rotate(0deg);
}

[data-theme="light"] .theme-switch-sun {
    opacity: 1;
    transform: translateY(-50%) scale(1) rotate(0deg);
}

[data-theme="light"] .theme-switch-moon {
    opacity: 0;
    transform: translateY(-50%) scale(0.5) rotate(90deg);
}

.theme-switch-thumb {
    position: absolute;
    top: 3px;
    left: 3px;
    width: 22px;
    height: 22px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
    transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1), background 0.4s ease;
}

[data-theme="light"] .theme-switch-thumb {
    transform: translateX(32px);
    background: #ffd54a;
    box-shadow: 0 2px 8px rgba(255, 213, 74, 0.5);
}

/* ===== MOBILE NAV ===== */
@media (max-width: 900px) {
    .site-header .main-nav {
        position: fixed;
        top: 0;
        right: -100%;
        width: 280px;
        height: 100vh;
        background-color: var(--bg-alt);
        border-left: 1px solid var(--border);
        padding: 70px 20px 20px;
        transition: right 0.35s ease;
        box-shadow: -10px 0 30px rgba(0, 0, 0, 0.3);
    }
    .site-header .main-nav.active { right: 0; }
    .site-header .main-nav ul { flex-direction: column; gap: 4px; }
    .site-header .main-nav ul li a { display: block; padding: 12px 16px; }
    .site-header .close-nav { display: block; }
    .site-header .mobile-menu-btn { display: block; }
}

/* ===== FOOTER ===== */
.site-footer {
    background-color: var(--footer-bg) !important;
    color: #cccccc !important;
    padding: 70px 0 0;
    border-top: 1px solid var(--footer-border);
}

.site-footer .footer-content {
    padding: 0 20px 40px;
    max-width: 1400px;
    margin: 0 auto;
}

.site-footer .footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
    gap: 40px;
}

.site-footer h3 {
    color: #ffffff !important;
    font-size: 1.1rem;
    margin-bottom: 18px;
    font-weight: 600;
}

.site-footer p, .site-footer li {
    color: #999999 !important;
    font-size: 0.92rem;
    line-height: 1.7;
}

.site-footer ul { list-style: none; padding: 0; margin: 0; }
.site-footer ul li { margin-bottom: 10px; }

.site-footer ul li a {
    color: #999999 !important;
    text-decoration: none;
    transition: color 0.25s ease, padding-left 0.25s ease;
}

.site-footer ul li a:hover {
    color: #ffffff !important;
    padding-left: 4px;
}

.site-footer ul li i {
    margin-right: 8px;
    color: #777777;
    width: 16px;
}

.site-footer .social-icons {
    display: flex;
    gap: 12px;
    margin-top: 20px;
}

.site-footer .social-icons a {
    width: 38px;
    height: 38px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background-color: #1a1a1a;
    border: 1px solid #2a2a2a;
    border-radius: 50%;
    color: #cccccc !important;
    font-size: 0.95rem;
    transition: all 0.3s ease;
}

.site-footer .social-icons a:hover {
    background-color: #ffffff;
    color: #0a0a0a !important;
    transform: translateY(-3px);
    border-color: #ffffff;
}

.site-footer .footer-bottom {
    background-color: #000000 !important;
    padding: 18px 0;
    text-align: center;
    border-top: 1px solid #1a1a1a;
    margin-top: 40px;
}

.site-footer .footer-bottom p {
    color: #777777 !important;
    margin: 0;
    font-size: 0.88rem;
}

/* ===== PAGE CONTENT OVERRIDES ===== */
section { background-color: var(--bg) !important; }
.expertise, .manufacturing, .about { background-color: var(--bg-alt) !important; }

.expertise-card, .product-card, .feature-item,
.value-item, .contact-info, .contact-form,
.spec-item, .application-card, .process-card,
.facility-card, .stat-card, .quality-item,
.tech-item, .info-card, .capability-column,
.partnership-item, .team-card, .timeline-item {
    background-color: var(--surface) !important;
    border: 1px solid var(--border) !important;
    box-shadow: var(--shadow) !important;
    color: var(--text) !important;
}

.expertise-card:hover, .product-card:hover,
.feature-item:hover, .facility-card:hover {
    box-shadow: var(--shadow-hover) !important;
    border-color: var(--border-strong) !important;
}

.expertise-card h3, .product-card h3,
.feature-item h3, .value-item h3 { color: var(--text) !important; }

.expertise-icon {
    background-color: var(--bg-elevated) !important;
    color: var(--text) !important;
}
.expertise-icon i { color: var(--text) !important; }

/* Hero / dark sections stay dark always */
.hero, .product-hero, .page-hero,
.partnerships, .manufacturing-stats, .cta-section {
    background-color: #0a0a0a !important;
    color: #f5f5f5 !important;
}

.hero h1, .hero h2, .hero p,
.product-hero h1, .product-hero h2, .product-hero p,
.partnerships h2, .partnerships p,
.partnerships h3 { color: #f5f5f5 !important; }

.partnership-item {
    background-color: rgba(255, 255, 255, 0.05) !important;
    border: 1px solid rgba(255, 255, 255, 0.1) !important;
}

.partnership-item h3 { color: #ffffff !important; }
.partnership-item p, .partnership-label { color: #b0b0b0 !important; }
.partnership-icon { color: #ffffff !important; }

.manufacturing-stats { background-color: #0a0a0a !important; }
.manufacturing-stats .stat-number { color: #ffffff !important; }
.manufacturing-stats .stat-label { color: #b0b0b0 !important; }

/* Buttons */
.btn {
    background-color: var(--btn-bg) !important;
    color: var(--btn-text) !important;
    border: 1px solid var(--btn-bg) !important;
    border-radius: 4px;
    transition: all 0.25s ease;
}

.btn:hover {
    background-color: var(--btn-bg-hover) !important;
    border-color: var(--btn-bg-hover) !important;
    transform: translateY(-2px);
    box-shadow: var(--shadow) !important;
}

.btn-outline {
    background-color: transparent !important;
    color: var(--text) !important;
    border: 2px solid var(--text) !important;
}

.btn-outline:hover {
    background-color: var(--text) !important;
    color: var(--bg) !important;
}

h2::after { background-color: var(--text) !important; }

.product-tag {
    background-color: var(--surface-hover) !important;
    color: var(--text) !important;
    border: 1px solid var(--border) !important;
}

/* Forms */
.form-group label { color: var(--text-muted) !important; }

.form-group input,
.form-group select,
.form-group textarea {
    background-color: var(--input-bg) !important;
    border: 1px solid var(--input-border) !important;
    color: var(--text) !important;
    border-radius: 4px;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--text) !important;
}

.contact-item {
    background-color: var(--surface) !important;
    border: 1px solid var(--border) !important;
}

.contact-item i, .contact-item h3 { color: var(--text) !important; }

/* Tables */
table { background-color: var(--surface) !important; color: var(--text) !important; }
th { background-color: var(--bg-elevated) !important; color: var(--text) !important; border-color: var(--border) !important; }
td { color: var(--text-muted) !important; border-color: var(--border) !important; }
tr:nth-child(even) td { background-color: var(--bg-alt) !important; }

.formation-info, hr { border-color: var(--border) !important; }
.logo-item img { background-color: var(--surface) !important; border: 1px solid var(--border); }
.logo-item span { color: var(--text-muted) !important; }

.capability-item h4 i,
.feature-item i,
.value-item i,
.contact-item i { color: var(--text) !important; }

.stat-number { color: var(--text) !important; }

/* Body padding for fixed header */
body { padding-top: 0; }
.hero, .product-hero, .page-hero { padding-top: 100px !important; }