* { 
    margin: 0; 
    padding: 0; 
    box-sizing: border-box; 
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif; 
    scroll-behavior: smooth; 
}

:root { 
    --bg-color: #0c111d; 
    --text-color: #f3f4f6; 
    --accent-color: #00ffff; 
    --card-bg: #1e293b; 
    --transition: all 0.5s cubic-bezier(0.19, 1, 0.22, 1); 
    --screen-padding: 8%; 
    --glass-effect: rgba(255, 255, 255, 0.03); 
    --glass-blur: blur(12px); 
}

body.dark-mode { 
    --bg-color: #f9fafb; 
    --text-color: #0c111d; 
    --accent-color: #6366f1; 
    --card-bg: #ffffff; 
    --glass-effect: rgba(0, 0, 0, 0.03); 
}

body { 
    background-color: var(--bg-color); 
    color: var(--text-color); 
    transition: var(--transition); 
    line-height: 1.7; 
    font-size: 16px; 
    overflow-x: hidden; 
}

/* --- NAVIGACE --- */
nav.glass-nav { 
    display: flex; 
    justify-content: space-between; 
    align-items: center; 
    padding: 1rem var(--screen-padding); 
    width: 100%; 
    position: fixed; 
    top: 0; 
    background-color: var(--glass-effect); 
    backdrop-filter: var(--glass-blur); 
    -webkit-backdrop-filter: var(--glass-blur); 
    z-index: 1000; 
    border-bottom: 1px solid rgba(255, 255, 255, 0.05); 
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1); 
}

body.dark-mode nav.glass-nav { 
    border-bottom: 1px solid rgba(0, 0, 0, 0.05); 
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.03); 
}

.logo { 
    font-size: 1.6rem; 
    font-weight: 800; 
    letter-spacing: -2px; 
    text-transform: uppercase; 
    color: var(--text-color); 
    filter: drop-shadow(0 0 5px rgba(255,255,255,0.1)); 
}

.nav-right { 
    display: flex; 
    align-items: center; 
    gap: 1.5rem; 
}

.nav-link { 
    text-decoration: none; 
    color: var(--text-color); 
    font-weight: 600; 
    font-size: 0.95rem; 
    position: relative; 
    opacity: 0.8; 
}

.nav-link:hover { opacity: 1; }

.nav-link::after { 
    content: ''; 
    position: absolute; 
    width: 0; 
    height: 2px; 
    bottom: -5px; 
    left: 0; 
    background-color: var(--accent-color); 
    transition: var(--transition); 
}

.nav-link:hover::after { width: 100%; }

.theme-toggle { 
    background: none; 
    border: 1px solid var(--text-color); 
    color: var(--text-color); 
    padding: 0.6rem 1.4rem; 
    border-radius: 30px; 
    cursor: pointer; 
    font-weight: 700; 
    font-size: 0.8rem; 
    text-transform: uppercase; 
    letter-spacing: 1.5px; 
    transition: var(--transition); 
    opacity: 0.8; 
}

.theme-toggle:hover { 
    background-color: var(--text-color); 
    color: var(--bg-color); 
    border-color: var(--text-color); 
    opacity: 1; 
}

/* --- HERO SEKCE --- */
header.hero { 
    width: 100%; 
    padding: 12rem var(--screen-padding) 8rem var(--screen-padding); 
}

.hero-content { max-width: 950px; }

header.hero h1 { 
    font-size: 5rem; 
    font-weight: 800; 
    margin-bottom: 2rem; 
    letter-spacing: -4px; 
    line-height: 1.1; 
    color: var(--text-color); 
}

header.hero p { 
    font-size: 1.5rem; 
    opacity: 0.8; 
    max-width: 750px; 
    margin-bottom: 3rem; 
}

span.accent { 
    color: var(--accent-color); 
    filter: drop-shadow(0 0 10px rgba(0, 255, 255, 0.4)); 
}

/* --- PORTFOLIO GRID --- */
.portfolio-section { 
    width: 100%; 
    padding: 0 var(--screen-padding) 10rem var(--screen-padding); 
}

.portfolio-grid { 
    display: grid; 
    grid-template-columns: repeat(auto-fill, minmax(380px, 1fr)); 
    gap: 2rem; 
}

.portfolio-card {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    background-color: var(--card-bg);
    transition: var(--transition);
    aspect-ratio: 16 / 11;
    text-decoration: none;
    color: inherit;
    display: flex;
    flex-direction: column;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    border: 1px solid rgba(255, 255, 255, 0.03);
}

body.dark-mode .portfolio-card {
    border: 1px solid rgba(0, 0, 0, 0.03);
}

.portfolio-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

/* --- PORTFOLIO OBRÁZKY A EFEKTY --- */
.card-image {
    position: relative;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

.portfolio-card img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
    filter: blur(0px) brightness(1); 
    transform: scale(1);
}

.portfolio-card:hover img {
    filter: blur(8px) brightness(0.7);
    transform: scale(1.03);
}

/* --- SKLENĚNÉ OVERLAY KARET --- */
.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 2rem;
    text-align: center;
    opacity: 0;
    transition: var(--transition);
    z-index: 2;
    background-color: rgba(0, 0, 0, 0.1);
}

.portfolio-card:hover .card-overlay {
    opacity: 1;
}

.overlay-content {
    transform: scale(0.9) translateY(10px);
    transition: var(--transition);
    color: white;
    text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.portfolio-card:hover .overlay-content {
    transform: scale(1) translateY(0px);
}

.overlay-content h3 {
    font-size: 1.8rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 0.5rem;
}

.overlay-content p.category {
    font-size: 0.85rem;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-weight: 700;
    color: var(--accent-color);
    filter: drop-shadow(0 0 5px var(--accent-color));
}

/* --- KONTAKTNÍ SEKCE --- */
.contact-section { 
    width: 100%; 
    padding: 10rem var(--screen-padding); 
    background: radial-gradient(circle at top left, var(--card-bg) 0%, var(--bg-color) 70%); 
}

.contact-grid { 
    display: grid; 
    grid-template-columns: 1fr 1fr; 
    gap: 5rem; 
    align-items: center; 
}

.contact-image img { 
    width: 100%; 
    height: auto; 
    border-radius: 12px; 
    box-shadow: 0 0 50px rgba(0, 255, 255, 0.1); 
}

.contact-info h2 { 
    font-size: 4rem; 
    font-weight: 800; 
    letter-spacing: -3px; 
    margin-bottom: 2rem; 
    line-height: 1.1; 
}

.contact-info p { 
    font-size: 1.4rem; 
    opacity: 0.8; 
    margin-bottom: 3rem; 
    max-width: 550px; 
}

.contact-links { 
    display: flex; 
    flex-direction: column; 
    gap: 1.8rem; 
}

.glass-card { 
    background-color: var(--glass-effect); 
    backdrop-filter: var(--glass-blur); 
    -webkit-backdrop-filter: var(--glass-blur); 
    border: 1px solid rgba(255, 255, 255, 0.05); 
    border-radius: 12px; 
    box-shadow: 0 8px 16px rgba(0, 0, 0, 0.1); 
}

.contact-link-item { 
    text-decoration: none; 
    color: var(--text-color); 
    display: flex; 
    align-items: center; 
    gap: 1.5rem; 
    font-size: 1.2rem; 
    transition: var(--transition); 
    padding: 1.5rem; 
}

.contact-link-item:hover { 
    background-color: rgba(255, 255, 255, 0.05); 
    transform: translateX(8px); 
    border-color: rgba(0, 255, 255, 0.2); 
}

.contact-link-item .icon.neon-icon { font-size: 1.8rem; }

.contact-link-item .text { font-weight: 700; opacity: 0.9; }

/* --- PATIČKA --- */
footer { 
    text-align: center; 
    padding: 4rem var(--screen-padding); 
    opacity: 0.6; 
    font-size: 0.9rem; 
}

/* --- RESPONZIVITA (MEDIA QUERIES) --- */
@media (max-width: 1280px) { 
    header.hero h1 { font-size: 4rem; } 
}

@media (max-width: 1024px) { 
    header.hero h1 { font-size: 3.5rem; }
    .portfolio-grid { grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); } 
    .contact-grid { gap: 3rem; } 
}

@media (max-width: 768px) { 
    :root { --screen-padding: 6%; } 
    header.hero { padding-top: 10rem; } 
    header.hero h1 { font-size: 2.8rem; letter-spacing: -2px; } 
    header.hero p { font-size: 1.2rem; } 
    .portfolio-grid { grid-template-columns: 1fr; } 
    .contact-grid { grid-template-columns: 1fr; text-align: center; } 
    .contact-image { order: 2; max-width: 320px; margin: 0 auto;} 
    .contact-info h2 { font-size: 3rem; letter-spacing: -2px; } 
    .contact-info p { font-size: 1.2rem; margin-left: auto; margin-right: auto; } 
    .contact-link-item { justify-content: center; } 
}