/* main.css - Hlavní styly */

/* Reset a základní styly */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #0f0f0f;
    color: #e0e0e0;
    line-height: 1.6;
    padding-top: 80px;
}

/* Container */
.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Sections */
.section {
    padding: 60px 0;
    min-height: 100vh;
}

/* Typography */
h1 {
    text-align: center;
    color: #fff;
    font-size: 2.5rem;
    margin-bottom: 40px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

h2 {
    color: #fff;
    font-size: 2rem;
    margin-bottom: 30px;
    text-align: center;
}

h3 {
    color: #fff;
    font-size: 1.5rem;
    margin-bottom: 20px;
}

h4 {
    color: #fff;
    font-size: 1.2rem;
    margin-bottom: 15px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(15, 15, 15, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid #333;
    z-index: 1000;
    padding: 15px 0;
}

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

.navbar-brand {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.navbar-menu {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

.nav-link {
    color: #e0e0e0;
    text-decoration: none;
    padding: 8px 16px;
    border-radius: 8px;
    transition: all 0.3s ease;
    border: 1px solid transparent;
}

.nav-link:hover {
    background: rgba(102, 126, 234, 0.1);
    border-color: #667eea;
}

.nav-link.active {
    background: rgba(102, 126, 234, 0.2);
    border-color: #667eea;
}

/* Footer */
.footer {
    background: #1a1a1a;
    border-top: 1px solid #333;
    padding: 30px 0;
    text-align: center;
    margin-top: 100px;
}

.footer-content {
    color: #999;
    font-size: 1rem;
}

.footer-link {
    color: #667eea;
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s ease;
}

.footer-link:hover {
    color: #764ba2;
}

/* Loading state */
.loading {
    text-align: center;
    padding: 40px;
    color: #666;
    font-size: 1.2rem;
}

/* Utility classes */
.mb-15 {
    margin-bottom: 15px;
}

.mt-20 {
    margin-top: 20px;
}

.mt-30 {
    margin-top: 30px;
}

.note-text {
    color: #aaa;
    font-size: 0.9rem;
}

/* Info boxes */
.info-box {
    background: #2a2a2a;
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.section-subtitle {
    color: #fff;
    margin: 20px 0;
}

/* Lists */
.context-list {
    list-style: none;
    padding: 0;
}

.context-list li {
    margin-bottom: 10px;
    padding-left: 20px;
    position: relative;
}

.context-list li:before {
    content: "•";
    position: absolute;
    left: 0;
}

/* Grids */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.models-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(400px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

.tips-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.charts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin: 40px 0;
}