/* ============================================
   CSS Custom Properties (Variables)
   ============================================ */
:root {
    /* Dark Theme Colors */
    --primary-blue: #4a90e2;
    --primary-blue-dark: #003366;
    --primary-blue-light: #6db3ff;
    --accent-cyan: #00d4ff;
    --accent-purple: #a78bfa;

    --bg-dark: #0f0f0f;
    --bg-darker: #1a1a1a;
    --bg-card: #1e1e2e;
    --bg-card-hover: #252535;
    --bg-section-dark: #141420;
    --bg-section-light: #1f1f2e;

    --text-primary: #e8e8e8;
    --text-secondary: #b8b8c8;
    --text-muted: #888899;

    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #003366 0%, #1e3a5f 50%, #4a90e2 100%);
    --gradient-hero: linear-gradient(135deg, #001a33 0%, #003366 50%, #004d99 100%);
    --gradient-accent: linear-gradient(135deg, #4a90e2 0%, #00d4ff 100%);
    --gradient-glow: linear-gradient(135deg, rgba(74, 144, 226, 0.2) 0%, rgba(0, 212, 255, 0.2) 100%);

    /* Shadows & Glows */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.6);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.7);
    --glow-blue: 0 0 20px rgba(74, 144, 226, 0.4);
    --glow-blue-strong: 0 0 30px rgba(74, 144, 226, 0.6), 0 0 60px rgba(74, 144, 226, 0.3);
    --glow-cyan: 0 0 20px rgba(0, 212, 255, 0.4);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50px;

    /* Transitions */
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   Base Styles
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', sans-serif;
    line-height: 1.7;
    color: var(--text-primary);
    background: var(--bg-dark);
    background-image: 
        radial-gradient(circle at 20% 50%, rgba(74, 144, 226, 0.05) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(0, 212, 255, 0.03) 0%, transparent 50%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* ============================================
   Header & Navigation
   ============================================ */
header {
    background: linear-gradient(135deg, rgba(0, 51, 102, 0.95) 0%, rgba(44, 62, 80, 0.95) 100%);
    backdrop-filter: blur(20px) saturate(180%);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md), 0 1px 0 rgba(74, 144, 226, 0.3);
    border-bottom: 1px solid rgba(74, 144, 226, 0.2);
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.logo {
    all: unset;
    font-size: 2rem;
    font-weight: 900;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    transition: all var(--transition-normal);
    letter-spacing: -0.5px;
    text-shadow: var(--glow-blue);
}

.logo:hover {
    transform: scale(1.05);
    text-shadow: var(--glow-blue-strong);
}

.icon-eye {
    background: url("/oneeye_logo.png") no-repeat center;
    background-size: contain;
    width: 1.2em;
    height: 1.2em;
    display: inline-block;
    filter: drop-shadow(0 0 8px rgba(74, 144, 226, 0.6));
    transition: all var(--transition-normal);
}

.logo:hover .icon-eye {
    filter: drop-shadow(0 0 12px rgba(74, 144, 226, 0.9));
    transform: rotate(15deg);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    transition: all var(--transition-normal);
    padding: 0.7rem 1.2rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    position: relative;
    overflow: hidden;
}

nav a::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: var(--gradient-accent);
    transition: left var(--transition-slow);
    z-index: -1;
    opacity: 0.3;
}

nav a:hover::before,
nav a.active::before {
    left: 0;
}

nav a:hover,
nav a.active {
    background: rgba(74, 144, 226, 0.2);
    box-shadow: var(--glow-blue);
    transform: translateY(-2px);
}

/* ============================================
   Hero Section
   ============================================ */
.hero {
    background: var(--gradient-hero);
    position: relative;
    color: white;
    padding: 150px 2rem 100px;
    text-align: center;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 50%, rgba(74, 144, 226, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 70% 50%, rgba(0, 212, 255, 0.1) 0%, transparent 50%);
    animation: heroGlow 10s ease-in-out infinite;
}

@keyframes heroGlow {
    0%, 100% {
        opacity: 0.5;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.1);
    }
}

.hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    font-weight: 900;
    letter-spacing: -1px;
    position: relative;
    z-index: 1;
    text-shadow: 0 0 30px rgba(74, 144, 226, 0.5), 0 0 60px rgba(74, 144, 226, 0.3);
    animation: fadeInUp 0.8s ease-out;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero p {
    font-size: clamp(1.1rem, 2vw, 1.4rem);
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    z-index: 1;
    animation: fadeInUp 0.8s ease-out 0.2s backwards;
}

/* ============================================
   Buttons
   ============================================ */
.btn {
    display: inline-block;
    padding: 14px 36px;
    background: var(--gradient-primary);
    color: white;
    text-decoration: none;
    border-radius: var(--radius-full);
    font-weight: 700;
    font-size: 1rem;
    letter-spacing: 0.5px;
    transition: all var(--transition-normal);
    border: 2px solid rgba(74, 144, 226, 0.5);
    box-shadow: var(--shadow-md), var(--glow-blue);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.2);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
    z-index: -1;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn:hover {
    transform: translateY(-4px) scale(1.03);
    box-shadow: var(--shadow-lg), var(--glow-blue-strong);
    border-color: var(--primary-blue-light);
}

.btn:active {
    transform: translateY(-2px) scale(1.01);
}

.btn-submit {
    width: 100%;
    padding: 14px;
    background: var(--gradient-primary);
    color: white;
    border: 2px solid rgba(74, 144, 226, 0.5);
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-md), var(--glow-blue);
    letter-spacing: 0.5px;
}

.btn-submit:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg), var(--glow-blue-strong);
    border-color: var(--primary-blue-light);
}

/* ============================================
   Containers & Sections
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: var(--spacing-lg) var(--spacing-md);
}

h2 {
    text-align: center;
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: var(--spacing-lg);
    color: var(--primary-blue-light);
    font-weight: 800;
    letter-spacing: -0.5px;
    text-shadow: var(--glow-blue);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-accent);
    border-radius: var(--radius-full);
    box-shadow: var(--glow-cyan);
}

.home-intro {
    background: var(--bg-section-light);
    position: relative;
}

.home-services {
    background: var(--bg-section-dark);
}

.about-section,
.contact-section {
    background: var(--bg-section-light);
}

/* ============================================
   Cards & Grid Items
   ============================================ */
.intro-grid,
.service-preview,
.service-grid {
    display: grid;
    gap: var(--spacing-md);
}

.intro-grid {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.service-preview {
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    margin-bottom: var(--spacing-md);
}

.service-grid {
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

.intro-card,
.service-item,
.service-card {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: var(--radius-lg);
    text-align: center;
    border: 2px solid rgba(74, 144, 226, 0.2);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

.intro-card::before,
.service-item::before,
.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-glow);
    opacity: 0;
    transition: opacity var(--transition-normal);
    z-index: 0;
}

.intro-card:hover::before,
.service-item:hover::before,
.service-card:hover::before {
    opacity: 1;
}

.intro-card:hover,
.service-item:hover,
.service-card:hover {
    transform: translateY(-8px) scale(1.02);
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg), var(--glow-blue);
    background: var(--bg-card-hover);
}

.intro-card h3,
.service-item h3,
.service-card h3 {
    color: var(--primary-blue-light);
    margin-bottom: 1rem;
    font-size: 1.5rem;
    font-weight: 700;
    position: relative;
    z-index: 1;
    text-shadow: var(--glow-blue);
}

.intro-card p,
.service-item p,
.service-card p {
    position: relative;
    z-index: 1;
    color: var(--text-secondary);
}

.service-card ul {
    list-style: none;
    margin-top: 1rem;
    position: relative;
    z-index: 1;
}

.service-card ul li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-secondary);
}

.service-card ul li:before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--primary-blue-light);
    font-weight: bold;
    text-shadow: var(--glow-blue);
}

/* ============================================
   Content Sections
   ============================================ */
.about-content,
.contact-info,
.contact-form {
    background: var(--bg-card);
    padding: 3rem;
    border-radius: var(--radius-lg);
    border: 2px solid rgba(74, 144, 226, 0.2);
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.about-content:hover,
.contact-info:hover,
.contact-form:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-lg), var(--glow-blue);
}

.about-content {
    max-width: 800px;
    margin: 0 auto;
    line-height: 1.8;
}

.about-content p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.contact-info {
    max-width: 600px;
    margin: 0 auto 3rem;
}

.contact-info p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.contact-info strong {
    color: var(--primary-blue-light);
    text-shadow: var(--glow-blue);
}

.contact-info a {
    color: var(--primary-blue-light);
    text-decoration: none;
    transition: all var(--transition-fast);
    text-shadow: var(--glow-blue);
}

.contact-info a:hover {
    color: var(--accent-cyan);
    text-shadow: var(--glow-cyan);
}

/* ============================================
   Forms
   ============================================ */
.contact-form {
    max-width: 600px;
    margin: 0 auto;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--primary-blue-light);
    font-weight: 700;
    letter-spacing: 0.3px;
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 0.9rem;
    border: 2px solid rgba(74, 144, 226, 0.3);
    border-radius: var(--radius-sm);
    background: var(--bg-darker);
    color: var(--text-primary);
    font-family: inherit;
    font-size: 1rem;
    transition: all var(--transition-normal);
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: var(--glow-blue);
    background: var(--bg-card);
}

.form-group textarea {
    resize: vertical;
    min-height: 150px;
}

/* ============================================
   Footer
   ============================================ */
footer {
    background: var(--gradient-primary);
    color: white;
    text-align: center;
    padding: var(--spacing-md);
    box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
    position: relative;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 2px;
    background: var(--gradient-accent);
    box-shadow: var(--glow-cyan);
}

footer p {
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
}

footer a {
    color: var(--accent-cyan);
    text-decoration: none;
    font-weight: bold;
    transition: all var(--transition-fast);
    text-shadow: var(--glow-cyan);
}

footer a:hover {
    color: white;
    text-shadow: var(--glow-blue-strong);
}

/* ============================================
   Responsive Design
   ============================================ */
@media (max-width: 768px) {
    .header-container {
        flex-direction: column;
        gap: 1rem;
    }

    nav ul {
        flex-direction: column;
        gap: 0.5rem;
        text-align: center;
        width: 100%;
    }

    .hero {
        padding: 120px 1rem 80px;
    }

    .intro-grid,
    .service-preview,
    .service-grid {
        grid-template-columns: 1fr;
    }

    .container {
        padding: var(--spacing-md) var(--spacing-sm);
    }

    .about-content,
    .contact-info,
    .contact-form {
        padding: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .btn {
        padding: 12px 28px;
        font-size: 0.95rem;
    }

    .intro-card,
    .service-item,
    .service-card {
        padding: 1.5rem;
    }
}

/* ============================================
   Accessibility & Performance
   ============================================ */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

a:focus-visible,
.btn:focus-visible,
.btn-submit:focus-visible,
input:focus-visible,
textarea:focus-visible,
select:focus-visible {
    outline: 3px solid var(--primary-blue);
    outline-offset: 3px;
    box-shadow: var(--glow-blue-strong);
}

/* ============================================
   Scrollbar Styling (Webkit)
   ============================================ */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: var(--bg-darker);
}

::-webkit-scrollbar-thumb {
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    border: 2px solid var(--bg-darker);
}

::-webkit-scrollbar-thumb:hover {
    background: var(--gradient-accent);
    box-shadow: var(--glow-blue);
}
/* Navigace */
header nav ul {
    list-style: none;
    display: flex;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

header nav a {
    text-decoration: none;
    color: #ccc;
    font-weight: 500;
    position: relative;
    transition: color 0.25s ease, transform 0.2s ease;
}

/* Hover efekt – podtržení světelnou linkou */
header nav a::after {
    content: "";
    position: absolute;
    left: 0;
    bottom: -4px;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, #00c6ff, #0072ff);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

/* Na hover – linka se rozzáří */
header nav a:hover {
    color: #fff;
    transform: translateY(-2px);
}

header nav a:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}

/* Aktivní stránka */
header nav a.active {
    color: #00c6ff;
}

header nav a.active::after {
    transform: scaleX(1);
    background: linear-gradient(90deg, #00c6ff, #0072ff);
}