/*
   FINÁLNÍ PORTABILNÍ DESIGN - RESPONSIVE & SEO READY
   Styl: Čistý, profesionální, bílé pozadí, červené akcenty
*/

@import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@400;700;800&display=swap');
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.1/css/all.min.css');

:root {
    --primary: #e74c3c;        /* Sytá červená */
    --primary-dark: #c0392b;
    --text-dark: #1a1a1a;
    --text-muted: #666666;
    --bg-light: #ffffff;
    --bg-soft: #f8f9fa;
    --border: #eeeeee;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
    --blue-soft: #ebf5ff;      /* Pro žáka */
    --green-soft: #ebfaf0;     /* Pro učitele */
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Montserrat', sans-serif;
    color: var(--text-dark);
    background: var(--bg-light);
    line-height: 1.5;
    font-size: 0.95rem;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Nav */
nav {
    background: #ffffff;
    padding: 15px 0;
    border-bottom: 2px solid var(--primary);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.3rem;
    font-weight: 800;
    color: var(--text-dark);
    text-decoration: none;
    text-transform: uppercase;
}

.logo span { color: var(--primary); }

.nav-links a {
    margin-left: 20px;
    text-decoration: none;
    color: var(--text-dark);
    font-weight: 700;
    font-size: 0.8rem;
}

/* Hero */
.hero {
    padding: 60px 0;
    background: linear-gradient(rgba(255,255,255,0.85), rgba(255,255,255,0.85)), url('img/bg_hero/hero_bg_01.jpg');
    background-size: cover;
    background-position: center;
    background-attachment: fixed;
    text-align: center;
}

.hero h1 {
    font-size: 2.8rem;
    font-weight: 800;
    color: var(--text-dark);
    line-height: 1.1;
    margin-bottom: 20px;
    text-transform: uppercase;
}

.hero p {
    font-size: 1.1rem;
    color: var(--text-muted);
    max-width: 700px;
    margin: 0 auto 40px;
}

.img-previews {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    gap: 20px;
    perspective: 1000px;
}

.img-previews img {
    max-width: 150px;
    border-radius: 15px;
    box-shadow: var(--shadow);
    cursor: pointer;
    transition: 0.4s;
    border: 5px solid #1a1a1a;
}

.img-previews img:first-child { transform: rotate(-8deg) translateX(10px); }
.img-previews img:last-child { transform: rotate(8deg) translateX(-10px); }

.img-previews img:hover {
    transform: rotate(0deg) scale(1.1);
    z-index: 10;
}

/* Experience Strip */
.exp-strip {
    background: #1a1a1a;
    color: #ffffff;
    font-size: 0.9rem;
    font-weight: 800;
    text-transform: uppercase;
    display: flex;
    justify-content: center;
    gap: 50px;
    width: 100%;
}

.exp-strip i { color: var(--primary); margin-right: 10px; }

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 30px;
    border-radius: 4px;
    font-weight: 800;
    text-decoration: none;
    transition: 0.2s;
    text-transform: uppercase;
    font-size: 0.8rem;
    border: none;
    cursor: pointer;
}

.btn-primary { background: var(--primary); color: #ffffff; }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 5px 15px rgba(231, 76, 60, 0.3); }

.btn-outline {
    background: #fff;
    border: 2px solid var(--text-dark);
    color: var(--text-dark);
}

/* Cards */
section { padding: 60px 0; }
.bg-soft { background: var(--bg-soft); }

h2 {
    font-size: 1.8rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 40px;
    text-transform: uppercase;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: #ffffff;
    padding: 30px;
    border: 1px solid var(--border);
    transition: 0.3s;
    text-align: center;
}

.card:hover { border-color: var(--primary); transform: translateY(-5px); }

.card i { font-size: 2.2rem; color: var(--primary); margin-bottom: 15px; }

/* Special Ping-Pong Phases */
.card-phase {
    text-align: left;
    border-top: 5px solid var(--border);
}

.card-phase.student {
    background-color: var(--blue-soft);
    border-top-color: #3498db;
}

.card-phase.teacher {
    background-color: var(--green-soft);
    border-top-color: #2ecc71;
}

.phase-header {
    display: flex;
    align-items: center;
    gap: 15px;
    margin-bottom: 20px;
}

.phase-header i {
    margin-bottom: 0;
    font-size: 1.8rem;
}

.card-phase.student i { color: #3498db; }
.card-phase.teacher i { color: #2ecc71; }

.phase-tag {
    font-weight: 800;
    font-size: 0.75rem;
    text-transform: uppercase;
    display: block;
    margin-bottom: 5px;
}

/* Promo Box */
.promo-box {
    background: var(--primary);
    color: #ffffff;
    padding: 50px 30px;
    text-align: center;
    margin-top: 40px;
}

/* Footer */
footer {
    background: #f8f9fa;
    padding: 60px 0 30px;
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 40px;
}

/* Responzivita */
@media (max-width: 768px) {
    .hero h1 { font-size: 2rem; }
    .exp-strip { flex-direction: column; align-items: center; gap: 10px; padding: 30px 0; }
    .footer-grid { grid-template-columns: 1fr; gap: 30px; }
    .nav-inner { flex-direction: column; gap: 15px; }
    .nav-links { display: flex; flex-wrap: wrap; justify-content: center; gap: 10px; }
    .nav-links a { margin: 0; }
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0; top: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.9);
}
.modal-content { margin: auto; display: block; max-width: 90%; max-height: 85%; }
.close { position: absolute; top: 20px; right: 35px; color: white; font-size: 40px; cursor: pointer; }