/* Základní styly s moderními vylepšeními */
:root {
    --ukraine-blue: #0057b7;
    --ukraine-yellow: #ffd700;
    --dark-blue: #003366;
    --light-blue: #e6f0fa;
    --dark-gray: #333;
    --medium-gray: #666;
    --light-gray: #f5f5f5;
    --white: #ffffff;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', sans-serif;
    line-height: 1.7;
    color: var(--dark-gray);
    background-color: var(--light-gray);
    overflow-x: hidden;
}

/* Vylepšený header s gradientem */
header {
    background: linear-gradient(135deg, var(--ukraine-blue) 0%, var(--dark-blue) 100%);
    color: var(--white);
    padding: 1.5rem 0;
    text-align: center;
    position: relative;
    box-shadow: var(--shadow);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
    animation: fadeInDown 0.8s ease;
}

/* Moderní navigace */
nav {
    background-color: var(--dark-blue);
    padding: 0.8rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 0.5rem;
    padding: 0 1rem;
}

nav ul li a {
    color: var(--white);
    text-decoration: none;
    padding: 0.7rem 1.5rem;
    border-radius: 30px;
    transition: var(--transition);
    font-weight: 500;
    display: inline-block;
    position: relative;
    overflow: hidden;
}

nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--ukraine-yellow);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.3s ease;
}

nav ul li a:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

nav ul li a:hover {
    color: var(--ukraine-yellow);
}

nav ul li a.active {
    background-color: var(--ukraine-yellow);
    color: var(--ukraine-blue);
    font-weight: 600;
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

/* Vylepšený hero section */
.hero {
    background: linear-gradient(rgba(0, 87, 183, 0.8), rgba(0, 87, 183, 0.8)), 
                url('https://images.unsplash.com/photo-1646933987650-70443a1fd2f4?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80');
    background-size: cover;
    background-position: center;
    color: var(--white);
    padding: 5rem 1rem;
    text-align: center;
    margin-bottom: 3rem;
    position: relative;
    border-radius: 0 0 10px 10px;
    overflow: hidden;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -50px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--light-gray);
    clip-path: polygon(0 0, 100% 0, 100% 20%, 0 100%);
    z-index: 1;
}

.hero h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    position: relative;
    z-index: 2;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.3);
    animation: fadeIn 1s ease;
}

.hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin: 0 auto;
    position: relative;
    z-index: 2;
    animation: fadeIn 1s ease 0.3s backwards;
}

/* Moderní obsahové sekce */
.content {
    display: grid;
    grid-template-columns: 1fr;
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto 3rem;
    padding: 0 1.5rem;
}

article {
    background-color: var(--white);
    padding: 2.5rem;
    border-radius: 10px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

article:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}

article::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 5px;
    height: 100%;
    background: linear-gradient(to bottom, var(--ukraine-blue), var(--ukraine-yellow));
}

article h3 {
    color: var(--ukraine-blue);
    margin-bottom: 1.5rem;
    padding-bottom: 0.8rem;
    border-bottom: 2px solid var(--ukraine-yellow);
    font-size: 1.5rem;
    position: relative;
}

article h3::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 50px;
    height: 2px;
    background: var(--ukraine-blue);
}

article p {
    margin-bottom: 1.5rem;
    color: var(--medium-gray);
}

article ul {
    margin-left: 1.5rem;
    margin-bottom: 1.5rem;
    list-style-type: none;
}

article ul li {
    padding: 0.5rem 0;
    position: relative;
    padding-left: 1.5rem;
}

article ul li::before {
    content: '•';
    color: var(--ukraine-yellow);
    font-weight: bold;
    position: absolute;
    left: 0;
}

/* Vylepšené obrázky */
.img-container {
    position: relative;
    margin: 2rem 0;
    border-radius: 8px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

.img-container img {
    width: 100%;
    height: auto;
    display: block;
    transition: var(--transition);
}

.img-container:hover img {
    transform: scale(1.03);
}

.img-container::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.3), transparent 30%);
    opacity: 0;
    transition: var(--transition);
}

.img-container:hover::after {
    opacity: 1;
}

/* Vylepšený formulář */
form {
    margin-top: 2rem;
}

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

.form-group label {
    display: block;
    margin-bottom: 0.7rem;
    font-weight: 600;
    color: var(--ukraine-blue);
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid #ddd;
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--light-gray);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--ukraine-blue);
    box-shadow: 0 0 0 3px rgba(0, 87, 183, 0.2);
    background-color: var(--white);
}

button[type="submit"] {
    background: linear-gradient(to right, var(--ukraine-blue), var(--dark-blue));
    color: var(--white);
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 1rem;
    font-weight: 600;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

button[type="submit"]:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
    background: linear-gradient(to right, var(--dark-blue), var(--ukraine-blue));
}

button[type="submit"] svg {
    margin-left: 8px;
    width: 16px;
    height: 16px;
    fill: currentColor;
}

/* Nový prvek - statistiky */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
    margin: 2rem 0;
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--ukraine-blue);
    margin-bottom: 0.5rem;
}

.stat-label {
    color: var(--medium-gray);
    font-size: 0.9rem;
}

/* Nový prvek - časová osa */
.timeline {
    position: relative;
    max-width: 800px;
    margin: 3rem auto;
    padding: 0 1rem;
}

.timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 2px;
    height: 100%;
    background: var(--ukraine-yellow);
}

.timeline-item {
    position: relative;
    margin-bottom: 2.5rem;
    width: 100%;
}

.timeline-item:nth-child(odd) {
    padding-right: 50%;
    text-align: right;
}

.timeline-item:nth-child(even) {
    padding-left: 50%;
    text-align: left;
}

.timeline-content {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: var(--shadow);
    position: relative;
}

.timeline-content::before {
    content: '';
    position: absolute;
    top: 20px;
    width: 20px;
    height: 20px;
    background: var(--ukraine-blue);
    border-radius: 50%;
    border: 3px solid var(--ukraine-yellow);
}

.timeline-item:nth-child(odd) .timeline-content::before {
    right: -60px;
}

.timeline-item:nth-child(even) .timeline-content::before {
    left: -60px;
}

.timeline-date {
    color: var(--ukraine-blue);
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Vylepšený footer */
footer {
    background: linear-gradient(135deg, var(--dark-blue) 0%, var(--dark-gray) 100%);
    color: var(--white);
    text-align: center;
    padding: 2.5rem 1rem;
    margin-top: 3rem;
    position: relative;
}

footer p {
    max-width: 800px;
    margin: 0 auto;
}

footer::before {
    content: '';
    position: absolute;
    top: -90px;
    left: 0;
    width: 100%;
    height: 100px;
    background: var(--light-gray);
    clip-path: polygon(0 80%, 100% 0, 100% 100%, 0 100%);
}

/* Tlačítko zpět nahoru */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--ukraine-blue);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    text-decoration: none;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 99;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--dark-blue);
    transform: translateY(-3px);
}

/* Animace */
@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes fadeInDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); }
    100% { transform: scale(1); }
}

.pulse {
    animation: pulse 2s infinite;
}

/* Responzivita */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .hero {
        padding: 3rem 1rem;
    }
    
    .hero h2 {
        font-size: 1.8rem;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0.3rem;
        padding: 0.5rem;
    }
    
    nav ul li a {
        padding: 0.5rem;
        border-radius: 5px;
    }
    
    article {
        padding: 1.5rem;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item:nth-child(odd),
    .timeline-item:nth-child(even) {
        padding: 0;
        padding-left: 70px;
        text-align: left;
    }
    
    .timeline-item:nth-child(odd) .timeline-content::before,
    .timeline-item:nth-child(even) .timeline-content::before {
        left: -40px;
    }
}

@media (min-width: 768px) {
    .content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1024px) {
    .content {
        grid-template-columns: repeat(3, 1fr);
    }
}