/* ============================================
   Černý Welding s.r.o. - Modern Theme
   ============================================ */

/* --- CSS Variables --- */
:root {
    --color-bg: #0a0a0a;
    --color-bg-alt: #111111;
    --color-bg-card: #1a1a1a;
    --color-bg-card-hover: #222222;
    --color-surface: #161616;
    --color-border: #2a2a2a;
    --color-border-light: #333333;
    --color-text: #e8e8e8;
    --color-text-muted: #888888;
    --color-text-light: #aaaaaa;
    --color-accent: #f59e0b;
    --color-accent-hover: #d97706;
    --color-accent-light: rgba(245, 158, 11, 0.1);
    --color-white: #ffffff;
    --color-danger: #ef4444;
    --color-success: #22c55e;

    --font-heading: 'Oswald', sans-serif;
    --font-body: 'Inter', sans-serif;

    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 12px;
    --radius-xl: 16px;

    --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.4);
    --shadow-lg: 0 8px 32px rgba(0,0,0,0.5);

    --transition: 0.3s ease;
    --container-width: 1200px;
}

/* --- Reset & Base --- */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: var(--font-body);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text);
    background-color: var(--color-bg);
}

a {
    color: var(--color-accent);
    text-decoration: none;
    transition: color var(--transition);
}

a:hover {
    color: var(--color-accent-hover);
}

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

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.2;
    color: var(--color-white);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

/* --- Container --- */
.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* --- Buttons --- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.75rem 1.75rem;
    font-family: var(--font-body);
    font-size: 0.9rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    border: 2px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition);
    text-decoration: none;
    gap: 0.5rem;
}

.btn-primary {
    background: var(--color-accent);
    color: var(--color-bg);
    border-color: var(--color-accent);
}

.btn-primary:hover {
    background: var(--color-accent-hover);
    border-color: var(--color-accent-hover);
    color: var(--color-bg);
    transform: translateY(-1px);
}

.btn-outline {
    background: transparent;
    color: var(--color-white);
    border-color: var(--color-white);
}

.btn-outline:hover {
    background: var(--color-white);
    color: var(--color-bg);
}

.btn-lg {
    padding: 1rem 2.5rem;
    font-size: 1rem;
}

.btn-sm {
    padding: 0.5rem 1rem;
    font-size: 0.8rem;
}

.btn-danger {
    background: var(--color-danger);
    color: var(--color-white);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background: #dc2626;
    border-color: #dc2626;
    color: var(--color-white);
}

/* --- Utility --- */
.text-center { text-align: center; }
.text-accent { color: var(--color-accent); }

.section-label {
    display: inline-block;
    font-family: var(--font-body);
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.15em;
    color: var(--color-accent);
    margin-bottom: 0.75rem;
}

/* --- Header / Navigation --- */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border);
    transition: all var(--transition);
}

.site-header.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--color-white);
}

.logo:hover {
    color: var(--color-accent);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.2rem;
    letter-spacing: 0.1em;
    line-height: 1;
}

.logo-text small {
    font-size: 0.7rem;
    font-weight: 400;
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

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

.main-nav a {
    display: block;
    padding: 0.5rem 1rem;
    color: var(--color-text-light);
    font-size: 0.85rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: color var(--transition);
    position: relative;
}

.main-nav a::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 1rem;
    right: 1rem;
    height: 2px;
    background: var(--color-accent);
    transform: scaleX(0);
    transition: transform var(--transition);
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--color-accent);
}

.main-nav a.active::after,
.main-nav a:hover::after {
    transform: scaleX(1);
}

/* Mobile Toggle */
.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 5px;
    z-index: 1002;
    position: relative;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-white);
    transition: all var(--transition);
}

.mobile-toggle.active span:nth-child(1) {
    transform: rotate(45deg) translate(5px, 5px);
}

.mobile-toggle.active span:nth-child(2) {
    opacity: 0;
}

.mobile-toggle.active span:nth-child(3) {
    transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero Section --- */
.hero {
    position: relative;
    min-height: 85vh;
    display: flex;
    align-items: center;
    background: linear-gradient(135deg, #0a0a0a 0%, #1a1a1a 50%, #0a0a0a 100%);
    overflow: hidden;
    margin-top: 70px;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(ellipse at 20% 50%, rgba(245, 158, 11, 0.08) 0%, transparent 50%),
        radial-gradient(ellipse at 80% 20%, rgba(245, 158, 11, 0.05) 0%, transparent 50%);
}

.hero::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23ffffff' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");
    opacity: 0.5;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero-split {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 3rem;
}

.hero-text {
    flex: 1;
}

.hero-logo {
    flex-shrink: 0;
}

.hero-logo img {
    width: 320px;
    height: auto;
    opacity: 0.85;
    filter: drop-shadow(0 0 40px rgba(245, 158, 11, 0.15));
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.1;
}

.hero-subtitle {
    font-size: 1.15rem;
    color: var(--color-text-muted);
    max-width: 550px;
    margin-bottom: 2.5rem;
    line-height: 1.7;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
}

/* --- Page Header --- */
.page-header {
    padding: 8rem 0 3rem;
    background: linear-gradient(135deg, var(--color-bg) 0%, var(--color-bg-alt) 100%);
    border-bottom: 1px solid var(--color-border);
    margin-top: 70px;
}

.page-header h1 {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.page-header p {
    color: var(--color-text-muted);
    font-size: 1.1rem;
}

/* --- Sections --- */
.section {
    padding: 5rem 0;
}

.section-alt {
    background: var(--color-bg-alt);
}

/* --- Features Grid --- */
.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: all var(--transition);
}

.feature-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-icon {
    width: 60px;
    height: 60px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    color: var(--color-accent);
}

.feature-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.25rem;
}

.feature-card p {
    color: var(--color-text-muted);
    font-size: 0.95rem;
}

/* --- About Preview --- */
.about-preview-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-preview-text h2 {
    margin-bottom: 1.5rem;
}

.about-preview-text p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.about-preview-text .btn {
    margin-top: 1rem;
}

.about-preview-image {
    display: flex;
    align-items: center;
    justify-content: center;
}

.about-logo-img {
    max-width: 300px;
    height: auto;
    opacity: 0.8;
}

/* --- Contact extras --- */
.contact-ico {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    margin-bottom: 2rem;
}

.contact-map h2 {
    margin-bottom: 1.5rem;
}

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

.map-wrapper iframe {
    display: block;
}

/* --- CTA Section --- */
.cta-section {
    background: linear-gradient(135deg, var(--color-accent) 0%, var(--color-accent-hover) 100%);
    text-align: center;
}

.cta-content h2 {
    color: var(--color-bg);
    margin-bottom: 0.75rem;
}

.cta-content p {
    color: rgba(0,0,0,0.6);
    margin-bottom: 2rem;
    font-size: 1.1rem;
}

.cta-section .btn-primary {
    background: var(--color-bg);
    color: var(--color-accent);
    border-color: var(--color-bg);
}

.cta-section .btn-primary:hover {
    background: var(--color-white);
    border-color: var(--color-white);
}

/* --- Content Block --- */
.content-block {
    max-width: 800px;
    margin-bottom: 3rem;
}

.content-block h2 {
    margin-bottom: 1.5rem;
}

.content-block p {
    color: var(--color-text-muted);
    margin-bottom: 1rem;
    line-height: 1.8;
}

/* --- Stats Grid --- */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
}

.stat-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    text-align: center;
}

.stat-number {
    font-family: var(--font-heading);
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--color-accent);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.85rem;
    color: var(--color-text-muted);
}

/* --- Qualifications Grid --- */
.qualifications-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
    margin-top: 2rem;
}

.qual-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2rem;
    transition: all var(--transition);
}

.qual-card:hover {
    border-color: var(--color-accent);
}

.qual-card h3 {
    font-size: 1.1rem;
    margin-bottom: 0.75rem;
    color: var(--color-accent);
}

.qual-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.6;
}

/* --- Services Grid --- */
.services-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.service-card {
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 2.5rem;
    transition: all var(--transition);
}

.service-card:hover {
    border-color: var(--color-accent);
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.service-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    color: var(--color-accent);
}

.service-card h3 {
    margin-bottom: 0.75rem;
    font-size: 1.2rem;
}

.service-card p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

/* --- Gallery Grid --- */
.gallery-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.gallery-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    aspect-ratio: 4/3;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform var(--transition);
}

.gallery-item:hover img {
    transform: scale(1.05);
}

.gallery-item-overlay {
    position: absolute;
    inset: 0;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity var(--transition);
    color: var(--color-white);
}

.gallery-item:hover .gallery-item-overlay {
    opacity: 1;
}

/* --- Certificates Grid --- */
.certs-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 1.5rem;
}

.cert-item {
    position: relative;
    border-radius: var(--radius-lg);
    overflow: hidden;
    cursor: pointer;
    background: var(--color-bg-card);
    border: 1px solid var(--color-border);
    transition: all var(--transition);
}

.cert-item:hover {
    border-color: var(--color-accent);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.cert-item img {
    width: 100%;
    aspect-ratio: 3/4;
    object-fit: cover;
    transition: transform var(--transition);
}

.cert-item:hover img {
    transform: scale(1.02);
}

.cert-item-title {
    padding: 0.75rem 1rem;
    font-size: 0.8rem;
    color: var(--color-text-muted);
    border-top: 1px solid var(--color-border);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.cert-item .gallery-item-overlay {
    bottom: auto;
    top: 0;
    height: calc(100% - 40px);
}

/* --- Contact --- */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
}

.contact-info h2 {
    margin-bottom: 2rem;
}

.contact-item {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
    align-items: flex-start;
}

.contact-icon {
    width: 48px;
    height: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--color-accent-light);
    border-radius: var(--radius-md);
    color: var(--color-accent);
    flex-shrink: 0;
}

.contact-item strong {
    display: block;
    color: var(--color-white);
    margin-bottom: 0.25rem;
}

.contact-item p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.contact-item a {
    color: var(--color-text-muted);
}

.contact-item a:hover {
    color: var(--color-accent);
}


/* --- Empty State --- */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
}

.empty-state svg {
    margin: 0 auto 1.5rem;
    color: var(--color-text-muted);
}

.empty-state h2 {
    margin-bottom: 0.75rem;
}

.empty-state p {
    color: var(--color-text-muted);
    margin-bottom: 1.5rem;
}

/* --- Footer --- */
.site-footer {
    background: var(--color-surface);
    border-top: 1px solid var(--color-border);
    padding: 4rem 0 0;
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    padding-bottom: 3rem;
}

.footer-logo {
    margin-bottom: 1rem;
}

.footer-logo .logo-text {
    font-size: 1.1rem;
    color: var(--color-white);
}

.site-footer p {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    line-height: 1.7;
}

.site-footer h4 {
    font-size: 1rem;
    margin-bottom: 1.25rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.site-footer ul {
    list-style: none;
}

.site-footer ul li {
    margin-bottom: 0.5rem;
}

.site-footer ul a {
    color: var(--color-text-muted);
    font-size: 0.9rem;
    transition: color var(--transition);
}

.site-footer ul a:hover {
    color: var(--color-accent);
}

.footer-contact li {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.footer-contact svg {
    flex-shrink: 0;
    color: var(--color-accent);
}

.footer-bottom {
    border-top: 1px solid var(--color-border);
    padding: 1.5rem 0;
    text-align: center;
}

.footer-bottom p {
    font-size: 0.8rem;
}

/* --- Lightbox --- */
.lightbox {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 9999;
    background: rgba(0,0,0,0.95);
    align-items: center;
    justify-content: center;
}

.lightbox.active {
    display: flex;
}

.lightbox-content {
    max-width: 90vw;
    max-height: 90vh;
    position: relative;
}

.lightbox-content img {
    max-width: 90vw;
    max-height: 85vh;
    object-fit: contain;
    border-radius: var(--radius-md);
}

.lightbox-caption {
    text-align: center;
    padding: 1rem;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.lightbox-close,
.lightbox-prev,
.lightbox-next {
    position: absolute;
    background: none;
    border: none;
    color: var(--color-white);
    font-size: 2rem;
    cursor: pointer;
    padding: 1rem;
    z-index: 10000;
    transition: color var(--transition);
}

.lightbox-close:hover,
.lightbox-prev:hover,
.lightbox-next:hover {
    color: var(--color-accent);
}

.lightbox-close {
    top: 1rem;
    right: 1rem;
    font-size: 2.5rem;
}

.lightbox-prev {
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
}

.lightbox-next {
    right: 1rem;
    top: 50%;
    transform: translateY(-50%);
}

/* --- Responsive --- */
@media (max-width: 1024px) {
    .features-grid,
    .services-grid,
    .qualifications-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    h1 { font-size: 2rem; }
    h2 { font-size: 1.5rem; }

    .mobile-toggle {
        display: flex;
    }

    .site-header {
        background: var(--color-bg);
        backdrop-filter: none;
        z-index: 9999;
    }

    .main-nav {
        position: fixed;
        top: 70px;
        left: 0;
        width: 100%;
        height: calc(100vh - 70px);
        height: calc(100dvh - 70px);
        background: var(--color-bg);
        display: none;
        padding: 1rem 2rem 2rem;
        z-index: 9999;
        overflow-y: auto;
        -webkit-overflow-scrolling: touch;
    }

    .main-nav.active {
        display: flex;
        flex-direction: column;
    }

    .main-nav ul {
        flex-direction: column;
        gap: 0;
        width: 100%;
    }

    .main-nav a {
        padding: 1.25rem 0;
        font-size: 1.2rem;
        border-bottom: 1px solid var(--color-border);
        display: block;
    }

    .main-nav a.active {
        color: var(--color-accent);
    }

    .main-nav a::after {
        display: none;
    }

    .hero {
        min-height: 70vh;
    }

    .hero-split {
        flex-direction: column;
        text-align: center;
    }

    .hero-logo img {
        width: 200px;
    }

    .hero-title {
        font-size: 2.2rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-buttons {
        justify-content: center;
    }

    .about-logo-img {
        max-width: 200px;
    }

    .page-header {
        padding: 6rem 0 2rem;
    }

    .page-header h1 {
        font-size: 2rem;
    }

    .section {
        padding: 3rem 0;
    }

    .features-grid,
    .services-grid,
    .qualifications-grid {
        grid-template-columns: 1fr;
    }

    .about-preview-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: 3rem;
    }

    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 1rem;
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
    }

    .gallery-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
        gap: 1rem;
    }

    .certs-grid {
        grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
        gap: 1rem;
    }

    .lightbox-prev,
    .lightbox-next {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 1.8rem;
    }

    .hero-buttons {
        flex-direction: column;
    }

    .hero-buttons .btn {
        width: 100%;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .gallery-grid {
        grid-template-columns: 1fr 1fr;
    }

    .certs-grid {
        grid-template-columns: 1fr 1fr;
    }
}