/* ═══════════════════════════════════════════════════════════════
   KVIZYONLINE.CZ - PREMIUM MODERN DESIGN
   ════════════════════════════════════════════════════════════════ */

/* === RESET === */
*, *::before, *::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* === VARIABLES === */
:root {
    /* Colors */
    --primary: #FF6B6B;
    --primary-dark: #EE5A52;
    --primary-light: #FF8787;
    --secondary: #4ECDC4;
    --accent: #FFE66D;
    --dark: #2D3436;
    --gray-900: #1A1D1F;
    --gray-800: #2D3436;
    --gray-700: #4A5568;
    --gray-600: #6B7280;
    --gray-500: #9CA3AF;
    --gray-400: #D1D5DB;
    --gray-300: #E5E7EB;
    --gray-200: #F3F4F6;
    --gray-100: #F9FAFB;
    --white: #FFFFFF;
    --success: #26DE81;
    --warning: #FED330;
    --danger: #FC5C65;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #FF6B6B 0%, #FF8E53 100%);
    --gradient-secondary: linear-gradient(135deg, #4ECDC4 0%, #44A08D 100%);
    --gradient-accent: linear-gradient(135deg, #FFE66D 0%, #FFAF40 100%);
    --gradient-dark: linear-gradient(135deg, #2D3436 0%, #1A1D1F 100%);
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.2);
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    --spacing-3xl: 6rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.15s ease;
}

/* === BASE === */
html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gray-100);
    color: var(--gray-800);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1320px;
    margin: 0 auto;
    padding: 0 24px;
    width: 100%;
}

/* === NAVBAR === */
.navbar {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid var(--gray-200);
}

.nav-wrapper {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    transition: var(--transition);
}

.logo:hover {
    transform: translateY(-2px);
}

.logo-image {
    height: 48px;
    width: auto;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    gap: 8px;
    align-items: center;
}

.nav-link {
    padding: 10px 20px;
    border-radius: var(--radius-full);
    text-decoration: none;
    color: var(--gray-700);
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
    position: relative;
}

.nav-link:hover {
    color: var(--primary);
    background: rgba(255, 107, 107, 0.08);
}

.nav-link.active {
    color: var(--white);
    background: var(--gradient-primary);
    box-shadow: 0 4px 16px rgba(255, 107, 107, 0.3);
}

/* === HAMBURGER === */
.hamburger {
    display: none;
    flex-direction: column;
    gap: 6px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
    z-index: 1001;
}

.hamburger span {
    width: 28px;
    height: 3px;
    background: var(--gray-800);
    border-radius: 3px;
    transition: var(--transition);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(9px, 9px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(8px, -8px);
}

/* === HERO === */
.hero {
    position: relative;
    min-height: 90vh;
    display: flex;
    align-items: center;
    overflow: hidden;
}

.hero-media {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.media-item {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 2.5s cubic-bezier(0.4, 0, 0.2, 1);
}

.media-item.active {
    opacity: 1;
}

.media-item img,
.media-item video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.hero-gradient {
    position: absolute;
    inset: 0;
    background: linear-gradient(135deg, 
        rgba(255, 107, 107, 0.35) 0%, 
        rgba(78, 205, 196, 0.30) 100%);
    z-index: 1;
}

.hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    padding: var(--spacing-xl) 0;
}

.hero-tag {
    display: inline-block;
    padding: 12px 28px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(16px);
    border: 1px solid rgba(255, 255, 255, 0.25);
    border-radius: var(--radius-full);
    color: var(--white);
    font-weight: 700;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-lg);
    animation: fadeInDown 0.8s ease;
}

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

.hero-title {
    font-size: clamp(2.5rem, 7vw, 5.5rem);
    font-weight: 900;
    line-height: 1.1;
    color: var(--white);
    margin-bottom: var(--spacing-md);
    animation: fadeInUp 0.8s ease 0.2s both;
}

@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(40px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.text-gradient {
    background: linear-gradient(135deg, #FFE66D 0%, #FFAF40 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.hero-description {
    font-size: clamp(1rem, 2vw, 1.25rem);
    color: rgba(255, 255, 255, 0.95);
    max-width: 720px;
    margin: 0 auto var(--spacing-xl);
    line-height: 1.8;
    animation: fadeInUp 0.8s ease 0.4s both;
}

.hero-description strong {
    color: var(--accent);
    font-weight: 700;
}

.hero-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    max-width: 900px;
    margin: 0 auto;
    animation: fadeInUp 0.8s ease 0.6s both;
}

.stat-item {
    background: rgba(255, 255, 255, 0.12);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
}

.stat-item:hover {
    transform: translateY(-8px) scale(1.02);
    background: rgba(255, 255, 255, 0.18);
    box-shadow: 0 20px 48px rgba(0, 0, 0, 0.25);
}

.stat-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-xs);
    filter: drop-shadow(0 4px 8px rgba(0, 0, 0, 0.2));
}

.stat-value {
    font-size: 2.75rem;
    font-weight: 900;
    color: var(--white);
    margin-bottom: var(--spacing-xs);
    line-height: 1;
}

.stat-label {
    font-size: 0.9375rem;
    color: rgba(255, 255, 255, 0.85);
    font-weight: 600;
}

/* === INTRO SECTION === */
.intro-section {
    padding: var(--spacing-3xl) 0;
    background: linear-gradient(180deg, var(--gray-100) 0%, var(--white) 100%);
}

.intro-card {
    max-width: 900px;
    margin: 0 auto;
    padding: var(--spacing-xl);
    background: var(--white);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    text-align: center;
}

.intro-card h2 {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.intro-card p {
    font-size: 1.125rem;
    line-height: 1.8;
    color: var(--gray-700);
}

/* === FILTERS === */
.filters {
    padding: var(--spacing-2xl) 0;
    background: var(--white);
}

.filter-group {
    margin-bottom: var(--spacing-lg);
}

.filter-group:last-child {
    margin-bottom: 0;
}

.filter-title {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: var(--spacing-md);
}

.filter-title .icon {
    font-size: 1.75rem;
}

.filter-title h3 {
    font-size: 1.375rem;
    font-weight: 700;
    color: var(--gray-900);
}

.filter-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
}

.filter-btn {
    padding: 12px 28px;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transition);
    border: 2px solid var(--gray-300);
    background: var(--white);
    color: var(--gray-700);
}

.filter-btn:hover {
    transform: translateY(-2px);
    border-color: var(--primary);
    color: var(--primary);
    box-shadow: var(--shadow);
}

.filter-btn.active {
    background: var(--gradient-primary);
    color: var(--white);
    border-color: transparent;
    box-shadow: 0 4px 20px rgba(255, 107, 107, 0.35);
}

.filter-btn.diff-easy.active {
    background: linear-gradient(135deg, #26DE81 0%, #20BF6B 100%);
    box-shadow: 0 4px 20px rgba(38, 222, 129, 0.35);
}

.filter-btn.diff-medium.active {
    background: linear-gradient(135deg, #FED330 0%, #F7B731 100%);
    box-shadow: 0 4px 20px rgba(254, 211, 48, 0.35);
}

.filter-btn.diff-hard.active {
    background: linear-gradient(135deg, #FC5C65 0%, #EB3B5A 100%);
    box-shadow: 0 4px 20px rgba(252, 92, 101, 0.35);
}

/* === QUIZZES === */
.quizzes {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-100);
}

.quiz-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
    gap: var(--spacing-lg);
}

.quiz-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    cursor: pointer;
    display: flex;
    flex-direction: column;
}

.quiz-card:hover {
    transform: translateY(-12px);
    box-shadow: var(--shadow-lg);
}

.quiz-thumbnail {
    position: relative;
    width: 100%;
    height: 240px;
    overflow: hidden;
    background: var(--gradient-primary);
}

.quiz-thumbnail img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
}

.quiz-card:hover .quiz-thumbnail img {
    transform: scale(1.1) rotate(2deg);
}

.quiz-placeholder {
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 6rem;
}

.quiz-difficulty {
    position: absolute;
    top: 16px;
    right: 16px;
    padding: 8px 20px;
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    backdrop-filter: blur(12px);
    border: 1px solid rgba(255, 255, 255, 0.3);
}

.quiz-difficulty.lehka {
    background: rgba(38, 222, 129, 0.92);
    color: var(--white);
}

.quiz-difficulty.stredni {
    background: rgba(254, 211, 48, 0.92);
    color: var(--gray-900);
}

.quiz-difficulty.tezka {
    background: rgba(252, 92, 101, 0.92);
    color: var(--white);
}

.quiz-body {
    padding: var(--spacing-lg);
    display: flex;
    flex-direction: column;
    flex: 1;
}

.quiz-category {
    display: inline-block;
    color: var(--primary);
    font-size: 0.8125rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: var(--spacing-xs);
}

.quiz-title {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
    line-height: 1.3;
}

.quiz-description {
    color: var(--gray-600);
    line-height: 1.7;
    margin-bottom: var(--spacing-md);
    flex: 1;
}

.quiz-meta {
    display: flex;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--gray-100);
    border-radius: var(--radius);
}

.meta-info {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--gray-700);
}

.meta-icon {
    font-size: 1.125rem;
}

.quiz-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 14px 28px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: 0.9375rem;
    transition: var(--transition);
    box-shadow: 0 4px 16px rgba(255, 107, 107, 0.3);
}

.quiz-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 24px rgba(255, 107, 107, 0.4);
}

.quiz-button svg {
    transition: var(--transition);
}

.quiz-button:hover svg {
    transform: translateX(4px);
}

/* === EMPTY STATE === */
.empty-state {
    text-align: center;
    padding: var(--spacing-3xl) var(--spacing-lg);
}

.empty-icon {
    font-size: 6rem;
    opacity: 0.3;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

.empty-state p {
    font-size: 1.125rem;
    color: var(--gray-600);
    margin-bottom: var(--spacing-lg);
}

.back-button {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 14px 32px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
}

.back-button:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* === PAGINATION === */
.pagination {
    padding: var(--spacing-2xl) 0;
    background: var(--gray-100);
}

.pagination-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-lg);
    padding: var(--spacing-md);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}

.page-btn {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
}

.page-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.page-info {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
}

.page-info strong {
    color: var(--primary);
}

/* === FOOTER === */
.footer {
    background: var(--gradient-dark);
    color: var(--white);
    padding: var(--spacing-2xl) 0;
    margin-top: var(--spacing-3xl);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 12px;
    text-decoration: none;
    margin-bottom: var(--spacing-sm);
}

.footer-logo img {
    height: 40px;
}

.footer-logo span {
    font-size: 1.375rem;
    font-weight: 800;
    color: var(--white);
}

.footer-info {
    text-align: right;
}

.footer-info p {
    color: rgba(255, 255, 255, 0.6); /* Jemnější barva pro copyright */
    font-size: 0.875rem;
    margin-bottom: 8px;
}

/* Nové styly pro odkazy ve footeru */
.footer-links {
    display: flex;
    align-items: center;
    justify-content: flex-end; /* Zarovnání doprava na PC */
    gap: 10px;
    flex-wrap: wrap;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.9375rem;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
    text-decoration: underline;
}

.footer-links .separator {
    color: rgba(255, 255, 255, 0.4);
    font-size: 1.2rem;
    line-height: 1;
}

/* === RESPONSIVE FOOTER === */
/* Najděte existující media query pro max-width: 768px a ujistěte se, že obsahuje toto: */
@media (max-width: 768px) {
    /* ... vaše existující styly ... */
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }

    .footer-links {
        justify-content: center; /* Na mobilu zarovnat odkazy na střed */
        margin-top: 8px;
    }
}
/* === RESPONSIVE === */
@media (max-width: 1024px) {
    .quiz-grid {
        grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    }
}

@media (max-width: 768px) {
    .hamburger {
        display: flex;
    }
    
    .nav-links {
        display: none;
        position: fixed;
        top: 78px;
        left: 0;
        right: 0;
        background: var(--white);
        box-shadow: var(--shadow-lg);
        flex-direction: column;
        padding: var(--spacing-md) 0;
        z-index: 999;
    }
    
    .nav-links.active {
        display: flex;
    }
    
    .nav-link {
        width: 100%;
        padding: var(--spacing-sm) var(--spacing-md);
        border-radius: 0;
        text-align: left;
    }
    
    .hero {
        min-height: 80vh;
    }
    
    /* HERO GRADIENT - SVĚTLEJŠÍ NA MOBILU */
    .hero-gradient {
        background: linear-gradient(135deg, 
            rgba(255, 107, 107, 0.20) 0%, 
            rgba(78, 205, 196, 0.15) 100%) !important;
    }
    
    .hero-stats {
        grid-template-columns: 1fr;
    }
    
    .quiz-grid {
        grid-template-columns: 1fr;
    }
    
    .filter-buttons {
        flex-direction: column;
    }
    
    .filter-btn {
        width: 100%;
        text-align: center;
    }
    
    .pagination-wrapper {
        flex-direction: column;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        text-align: center;
    }
    
    /* Logo zůstává viditelné */
    .logo-text {
        font-size: 1.25rem !important;
        display: inline-block !important;
    }
    
    .logo-image {
        height: 40px;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 16px;
    }
    
    .hero-tag {
        font-size: 0.75rem;
        padding: 10px 20px;
    }
    
    .intro-card {
        padding: var(--spacing-lg);
    }
    
    /* Logo text stále viditelný i na malých mobilech */
    .logo-text {
        font-size: 1rem !important;
        display: inline-block !important;
    }
    
    .logo-image {
        height: 36px;
    }
}
@media (max-width: 768px) {
    .logo {
        gap: 10px;
        align-items: center;
    }

    .logo-text {
        -webkit-text-fill-color: unset !important;
        color: var(--primary) !important;
        white-space: nowrap;
        opacity: 1 !important;
        visibility: visible !important;
    }

    .hero-gradient {
        opacity: 0.85;
    }
}
@media (max-width: 768px) {

    .nav-wrapper {
        gap: 12px;
    }

    .logo {
        flex: 1 1 auto;
        min-width: 0;
    }

    .logo-text {
        display: inline-block !important;
        white-space: nowrap;
        overflow: visible;
        flex-shrink: 0;
        -webkit-text-fill-color: unset !important;
        color: var(--primary) !important;
        max-width: none;
        opacity: 1 !important;
        visibility: visible !important;
    }

    .hamburger {
        flex-shrink: 0;
    }

    /* zesvětlení overlay hero */
    .hero-gradient {
        opacity: 0.85 !important;
    }
}
/* === TEXTOVÉ STRÁNKY (Zásady, Kontakt, Blog) === */

.policy-section {
    padding: var(--spacing-3xl) 0;
    background: var(--gray-100);
    min-height: 80vh; /* Aby footer nebyl uprostřed obrazovky u krátkého textu */
}

.policy-card {
    background: var(--white);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl); /* Velké odsazení uvnitř */
    box-shadow: var(--shadow-md);
    max-width: 900px;
    margin: 0 auto; /* Vycentrování */
}

.page-title {
    font-size: clamp(2rem, 5vw, 2.5rem);
    font-weight: 800;
    color: var(--gray-900);
    margin-bottom: var(--spacing-lg);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
}

.policy-content h2 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-sm);
    padding-bottom: var(--spacing-xs);
    border-bottom: 2px solid var(--gray-200);
}

.policy-content h3 {
    font-size: 1.125rem;
    color: var(--gray-800);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
}

.policy-content p {
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
    line-height: 1.8;
}

.policy-content ul {
    margin-bottom: var(--spacing-md);
    padding-left: 1.5rem;
    color: var(--gray-700);
}

.policy-content li {
    margin-bottom: 8px;
}

.policy-highlight {
    background: var(--gray-100);
    padding: var(--spacing-md);
    border-radius: var(--radius);
    border-left: 4px solid var(--primary); /* Červený proužek vlevo */
    margin: var(--spacing-md) 0;
    font-size: 0.95rem;
}

.policy-highlight a {
    color: var(--primary);
    text-decoration: none;
    font-weight: 600;
}

.policy-highlight a:hover {
    text-decoration: underline;
}

/* Responsivita pro textovou stránku */
@media (max-width: 768px) {
    .policy-card {
        padding: var(--spacing-md);
    }
    
    .policy-section {
        padding: var(--spacing-lg) 0;
    }
}