@font-face {
    font-family: 'Rukola';
    src: url('../font/Nikola Giacintova  - Rukola-Regular.otf') format('opentype');
    font-weight: normal;
    font-style: normal;
}

@font-face {
    font-family: 'PT Sans';
    src: url('../font/PT_Sans-Web-Regular.ttf') format('truetype');
    font-weight: 400;
    font-style: normal;
}

@font-face {
    font-family: 'PT Sans';
    src: url('../font/PT_Sans-Web-Italic.ttf') format('truetype');
    font-weight: 400;
    font-style: italic;
}

@font-face {
    font-family: 'PT Sans';
    src: url('../font/PT_Sans-Web-Bold.ttf') format('truetype');
    font-weight: 700;
    font-style: normal;
}

@font-face {
    font-family: 'PT Sans';
    src: url('../font/PT_Sans-Web-BoldItalic.ttf') format('truetype');
    font-weight: 700;
    font-style: italic;
}

:root {
    --primary-red: #DA251D;
    --primary-anthracite: #333333;
    --light-green: #DFF1CC;
    --white: #FFFFFF;
    --bg-light: #F8F9FA;
    --glass: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --transition: transform 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), opacity 0.4s cubic-bezier(0.165, 0.84, 0.44, 1), background-color 0.4s cubic-bezier(0.165, 0.84, 0.44, 1);
}

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

body {
    font-family: 'PT Sans', sans-serif;
    color: var(--primary-anthracite);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--white);
}

.script-font {
    font-family: 'Rukola', cursive;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.text-red {
    color: var(--primary-red);
}

.text-white {
    color: var(--white);
}

/* Animations */
@keyframes marquee {
    0% {
        transform: translateX(0);
    }

    100% {
        transform: translateX(-50%);
    }
}

@keyframes float {
    0% {
        transform: translateY(0px);
    }

    50% {
        transform: translateY(-10px);
    }

    100% {
        transform: translateY(0px);
    }
}

/* Sections */
section {
    padding: 120px 0;
    position: relative;
}

.section-tag {
    display: inline-block;
    color: var(--primary-red);
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 2px;
    font-size: 0.9rem;
    margin-bottom: 15px;
}

/* Hero Section */
.hero {
    height: 100vh;
    position: relative;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: var(--white);
    padding-bottom: 100px;
    z-index: 1;
    /* Offset for the overlapping info cards to make content look truly centered */
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
    z-index: 0;
}

.hero-bg::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    right: -20px;
    bottom: -20px;
    background: linear-gradient(rgba(0, 0, 0, 0.4), rgba(0, 0, 0, 0.5)), url('../assets/background-wood.jpg');
    background-size: cover;
    background-position: center;
    filter: blur(2px);
    transform: translate3d(0, 0, 0);
    will-change: transform;
}

.hero > .container {
    position: relative;
    z-index: 2;
}

.hero h1 {
    font-size: clamp(3.5rem, 12vw, 7rem);
    font-weight: 800;
    margin-bottom: 15px;
    line-height: 0.9;
    text-transform: uppercase;
}

.hero p {
    font-size: 1.6rem;
    max-width: 700px;
    margin-bottom: 35px;
    font-weight: 300;
    opacity: 0.9;
}

/* Ticker */
.ticker-wrap {
    position: absolute;
    bottom: 0;
    width: 100%;
    background: var(--primary-red);
    color: white;
    padding: 20px 0;
    overflow: hidden;
    z-index: 1;
}

.ticker {
    display: flex;
    width: fit-content;
    animation: marquee 40s linear infinite;
}

.ticker span {
    white-space: nowrap;
    padding: 0 40px;
    font-weight: 800;
    font-size: 1.2rem;
    text-transform: uppercase;
    display: flex;
    align-items: center;
    gap: 15px;
}

.ticker span::after {
    content: '★';
    color: rgba(255, 255, 255, 0.5);
}

/* Buttons */
.btn {
    display: inline-block;
    background: var(--primary-red);
    color: white;
    padding: 20px 50px;
    border-radius: 60px;
    text-decoration: none;
    font-weight: 700;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 15px 35px rgba(218, 37, 29, 0.4);
    text-transform: uppercase;
    letter-spacing: 1.5px;
}

.btn:hover {
    background: var(--white);
    color: var(--primary-red);
    transform: translateY(-8px) scale(1.05);
}

.info-cards-section {
    position: relative;
    z-index: 5;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
    margin-top: -100px;
    position: relative;
    z-index: 10;
}

.info-card {
    background: rgba(255, 255, 255, 0.9);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
    padding: 50px;
    border-radius: 30px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.08);
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.5);
    text-align: center;
}

.info-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 40px 80px rgba(0, 0, 0, 0.12);
}

.info-card i {
    font-size: 3rem;
    color: var(--primary-red);
    margin-bottom: 25px;
    display: block;
    animation: float 4s ease-in-out infinite;
}

/* Vision Section */
.info-section {
    display: flex;
    align-items: center;
    gap: 80px;
}

.info-text {
    flex: 1.2;
}

.info-text ul li {
    font-size: 1.1rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 15px;
}

.info-img-wrap {
    flex: 1;
    position: relative;
}

.info-img {
    width: 100%;
    border-radius: 40px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.15);
    transition: var(--transition);
}

.info-img:hover {
    transform: scale(1.02);
}

.info-img-wrap::before {
    content: '';
    position: absolute;
    top: -20px;
    right: -20px;
    width: 100%;
    height: 100%;
    border: 1px solid var(--primary-red);
    border-radius: 40px;
    z-index: -1;
    opacity: 0.3;
}

/* Program / Schedule */
.schedule-container {
    max-width: 900px;
    margin: 0 auto;
}

.schedule-item {
    display: flex;
    gap: 40px;
    padding: 40px 0;
    border-bottom: 1px solid #eee;
    transition: var(--transition);
}

.schedule-item:hover {
    border-color: var(--primary-red);
    transform: translateX(15px);
}

.time-col {
    min-width: 140px;
}

.time-col .time {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-red);
    line-height: 1;
}

.content-col h3 {
    font-size: 2rem;
    margin-bottom: 10px;
    font-weight: 700;
    line-height: 1.2;
}

.schedule-desc {
    font-size: 1rem;
    line-height: 1.6;
    color: #555;
}

.schedule-desc ul {
    margin: 8px 0 0 0;
    padding-left: 1.2em;
    list-style-position: outside;
}

.schedule-desc li {
    margin-bottom: 4px;
}

/* Speakers */
.speaker-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 50px;
    perspective: 1500px;
}

.speaker-card {
    position: relative;
    height: 550px;
    background: transparent;
}

/* Decorative effect behind speaker card */
.speaker-card::before {
    content: '';
    position: absolute;
    top: -15px;
    right: -15px;
    width: 100%;
    height: 100%;
    border: 1px solid var(--primary-red);
    border-radius: 40px;
    z-index: 0;
    opacity: 0.2;
    transition: var(--transition);
}

.speaker-card:hover::before {
    top: -20px;
    right: -20px;
    opacity: 0.4;
}

.speaker-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    text-align: left;
    transition: transform 0.8s cubic-bezier(0.175, 0.885, 0.32, 1.275);
    transform-style: preserve-3d;
    -webkit-transform-style: preserve-3d;
    z-index: 1;
    transform: rotateY(0deg);
}

@media (hover: hover) {
    .speaker-card:hover .speaker-card-inner {
        transform: rotateY(180deg);
        -webkit-transform: rotateY(180deg);
    }
}

.speaker-card-inner.flipped {
    transform: rotateY(180deg);
    -webkit-transform: rotateY(180deg);
}

.speaker-card-front,
.speaker-card-back {
    position: absolute;
    width: 100%;
    height: 100%;
    -webkit-backface-visibility: hidden;
    backface-visibility: hidden;
    border-radius: 40px;
    overflow: hidden;
}

.speaker-card-front {
    z-index: 2;
    transform: rotateY(0deg);
    -webkit-transform: rotateY(0deg);
    background: #eee;
    /* Fallback */
}

.speaker-card-front img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.speaker-card-back {
    background: var(--white);
    color: var(--primary-anthracite);
    transform: rotateY(180deg);
    padding: 40px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
    border: 1px solid #eee;
}

.speaker-role {
    font-size: 0.9rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    margin-bottom: 25px;
}

.speaker-desc p {
    font-size: 1.05rem;
    margin-bottom: 25px;
    color: #555;
}

.speaker-topics {
    list-style: none;
    margin-bottom: 30px;
}

.speaker-topics li {
    font-size: 0.95rem;
    font-weight: 600;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.speaker-topics i {
    color: var(--primary-red);
    font-size: 0.8rem;
}

.speaker-btn {
    font-weight: 800;
    font-size: 0.9rem;
    color: var(--primary-red);
    text-transform: uppercase;
    letter-spacing: 1px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.speaker-overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    padding: 40px;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
    color: white;
    transform: translateY(20px);
    transition: var(--transition);
}

.speaker-card:hover img {
    transform: scale(1.1);
}

.speaker-card:hover .speaker-overlay {
    transform: translateY(0);
}

/* Registration */
.reg-section {
    background: var(--primary-anthracite);
    color: white;
}

.reg-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 100px;
    align-items: center;
}

.reg-form-wrap {
    background: rgba(255, 255, 255, 0.03);
    padding: 40px 60px;
    border-radius: 40px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    -webkit-backdrop-filter: blur(10px);
    backdrop-filter: blur(10px);
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    margin-bottom: 15px;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 15px;
}

.input-group label {
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: rgba(255, 255, 255, 0.5);
}

.input-group input,
.input-group textarea {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: 18px;
    border-radius: 15px;
    color: white;
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

.input-group input:focus,
.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-red);
    background: rgba(255, 255, 255, 0.08);
}

/* Gallery */
.gallery-wrap {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.gallery-item {
    height: 350px;
    border-radius: 30px;
    overflow: hidden;
    position: relative;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
}

.gallery-item img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: all 0.6s cubic-bezier(0.165, 0.84, 0.44, 1);
}

.gallery-overlay {
    position: absolute;
    inset: 0;
    background: rgba(218, 37, 29, 0.6);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
    color: white;
    font-size: 2rem;
}

.gallery-item:hover .gallery-overlay {
    opacity: 1;
}

.gallery-item:hover img {
    transform: scale(1.1);
}

/* Lightbox */
.lightbox {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.95);
    z-index: 9999;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 40px;
    cursor: zoom-out;
}

/* Location Section */
.location-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.map-container {
    height: 400px;
    border-radius: 30px;
    overflow: hidden;
    border: 15px solid white;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1);
}

.lightbox img {
    max-width: 100%;
    max-height: 100%;
    border-radius: 10px;
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.5);
    transform: scale(0.9);
    opacity: 0;
    transition: all 0.4s ease;
}

.lightbox.active {
    display: flex;
}

.lightbox.active img {
    transform: scale(1);
    opacity: 1;
}

.close-lightbox {
    position: absolute;
    top: 40px;
    right: 40px;
    color: white;
    font-size: 3rem;
    cursor: pointer;
    opacity: 0.7;
    transition: var(--transition);
}

.close-lightbox:hover {
    opacity: 1;
    transform: rotate(90deg);
}

@media (max-width: 992px) {
    .gallery-wrap {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 576px) {
    .gallery-wrap {
        grid-template-columns: 1fr;
    }
}

/* Footer */
footer {
    padding: 80px 0;
    text-align: center;
    background: #111;
    color: rgba(255, 255, 255, 0.5);
}

footer .logo {
    margin-bottom: 30px;
}

@media (max-width: 992px) {
    .container {
        padding: 0 25px;
    }

    .hero h1 {
        font-size: 3.5rem;
    }

    .hero p {
        font-size: 1.2rem;
    }

    .info-cards {
        grid-template-columns: 1fr;
        margin-top: -50px;
        padding: 0 20px;
    }

    .info-card {
        padding: 40px 30px;
    }

    .info-section {
        flex-direction: column;
        text-align: center;
        gap: 50px;
    }

    .info-text div {
        grid-template-columns: 1fr !important;
        text-align: left;
    }

    .info-img-wrap {
        margin-top: 40px;
    }

    .reg-grid {
        grid-template-columns: 1fr;
        gap: 50px;
    }

    .reg-form-wrap {
        padding: 40px 20px;
    }

    .form-row {
        grid-template-columns: 1fr;
    }

    .location-grid {
        grid-template-columns: 1fr;
        gap: 40px;
        text-align: center;
    }

    .map-container {
        height: 300px;
    }

    .speaker-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    .gallery-wrap {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 600px) {
    .speaker-grid {
        grid-template-columns: 1fr;
    }

    .gallery-wrap {
        grid-template-columns: 1fr;
    }

    .time-col {
        min-width: 80px;
    }

    .time-col .time {
        font-size: 1.4rem;
    }

    .content-col h3 {
        font-size: 1.5rem;
    }
}

/* Smooth Scroll */
html {
    scroll-behavior: smooth;
}

/* Back to Top Button */
#back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    background: var(--primary-red);
    color: white;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    text-decoration: none;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    box-shadow: 0 10px 20px rgba(218, 37, 29, 0.3);
}

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

#back-to-top:hover {
    transform: translateY(-5px);
    background: var(--primary-anthracite);
}

/* Partners Section */
.partners-categories {
    width: 100%;
    margin: 0 auto;
}

.partner-category {
    padding: 40px 0;
    margin-bottom: 60px;
    text-align: center;
}

.partner-category:last-child {
    margin-bottom: 0;
}

.partner-category h3 {
    font-family: 'Outfit', sans-serif;
    font-weight: 800;
    text-transform: uppercase;
    letter-spacing: 4px;
    color: #aaa;
    font-size: 1rem;
    margin-bottom: 50px;
    position: relative;
    display: block;
    text-align: center;
}

.partner-category h3::after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 3px;
    background: var(--primary-red);
    border-radius: 2px;
}

.partners-grid-custom {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    align-items: center;
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.partner-item {
    width: 320px;
    height: 160px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 30px;
    background: white;
    border-radius: 25px;
    box-shadow: 0 15px 40px rgba(0,0,0,0.04);
    transition: var(--transition);
    border: 1px solid #f0f0f0;
    text-decoration: none;
}

.partner-item.main-partner {
    width: 600px;
    height: 300px;
    padding: 60px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.06);
}

.partner-item.large-partner {
    width: 420px;
    height: 210px;
    padding: 40px;
}

.partner-item.standard-partner {
    width: 280px;
    height: 140px;
    padding: 25px;
}

.placeholder-logo {
    font-size: 0.85rem;
    font-weight: 800;
    color: #bbb;
    text-transform: uppercase;
    letter-spacing: 1px;
    text-align: center;
    line-height: 1.2;
}

.partner-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 25px 60px rgba(0,0,0,0.1);
    border-color: var(--primary-red);
}

.partner-item img {
    max-width: 100%;
    max-height: calc(100% - 25px);
    object-fit: contain;
    filter: grayscale(10%) contrast(1.1);
    transition: var(--transition);
}

.partner-name {
    display: block;
    margin-top: 8px;
    font-size: 0.75rem;
    color: #999;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    font-weight: 600;
}

.partner-item:hover img {
    filter: grayscale(0%) contrast(1.1);
}

@media (max-width: 992px) {
    .partner-item.main-partner {
        width: 100%;
        max-width: 500px;
        height: 200px;
    }
    
    .partner-item {
        width: 100%;
        max-width: 350px;
    }
}

@media (max-width: 576px) {
    .partner-item.main-partner {
        height: 160px;
        padding: 30px;
    }
    
    .partner-item {
        height: 130px;
        padding: 20px;
    }
    
    .partner-category h3 {
        font-size: 0.85rem;
    }
}
@media (max-width: 576px) {
    .partners-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }
}

/* Topics Section */
.topics-section {
    background-color: var(--primary-red);
    color: var(--white);
    padding: 100px 0;
    position: relative;
    overflow: hidden;
}

.topics-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 40px;
    margin-top: 60px;
}

.topic-card {
    background: rgba(255, 255, 255, 0.1);
    padding: 40px 30px;
    border-radius: 20px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    width: calc(33.333% - 27px);
    min-width: 280px;
}

.topic-card:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-10px);
}

.topic-card i {
    font-size: 3rem;
    margin-bottom: 25px;
    opacity: 0.9;
}

.topic-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1.3;
}

@media (max-width: 992px) {
    .topic-card {
        width: calc(50% - 15px);
    }
}

@media (max-width: 768px) {
    .topic-card {
        width: 100%;
    }
    
    .topics-section {
        padding: 70px 0;
    }
}
/* ============================================================
   MOBILNÍ OPRAVY – speaker karty + partneři (jen zobrazení)
   ============================================================ */

/* Speaker karty – oprava iOS Safari backface-visibility bílé plochy */
@media (max-width: 768px) {
    .speaker-card {
        height: 480px;
    }

    /* iOS Safari fix: preserve-3d + backface-visibility crash */
    .speaker-card-inner {
        -webkit-transform-style: flat;
        transform-style: flat;
        -webkit-backface-visibility: visible;
        backface-visibility: visible;
    }

    .speaker-card-front,
    .speaker-card-back {
        -webkit-backface-visibility: visible;
        backface-visibility: visible;
        position: absolute;
        top: 0;
        left: 0;
    }

    /* Na mobilech je karta defaultně vpředu, flip jen přes .flipped */
    .speaker-card-back {
        display: none;
    }

    .speaker-card-inner.flipped .speaker-card-front {
        display: none;
    }

    .speaker-card-inner.flipped .speaker-card-back {
        display: flex;
        position: relative;
        height: 480px;
    }
}

@media (max-width: 600px) {
    .speaker-card {
        height: 420px;
    }

    .speaker-card-inner.flipped .speaker-card-back {
        height: 420px;
    }
}

/* Partner itemy – 2 sloupce na mobilech */
@media (max-width: 768px) {
    /* Grid přepnout na 2 sloupce */
    .partners-grid-custom {
        display: grid !important;
        grid-template-columns: repeat(2, 1fr) !important;
        gap: 14px !important;
        justify-items: stretch !important;
        max-width: 100% !important;
    }

    /* Hlavní partner přes celou šířku */
    .partner-item.main-partner {
        grid-column: 1 / -1;
        width: 100% !important;
        max-width: 100% !important;
        height: 110px !important;
        padding: 16px 20px !important;
    }

    /* Ostatní partneři – 2 ve sloupci */
    .partner-item,
    .partner-item.large-partner,
    .partner-item.standard-partner {
        width: 100% !important;
        max-width: 100% !important;
        height: 90px !important;
        padding: 14px 12px !important;
    }

    .partner-item img {
        max-height: calc(100% - 20px);
    }

    .partner-category {
        padding: 16px 0;
        margin-bottom: 20px;
    }

    .partner-category h3 {
        margin-bottom: 30px;
    }
}

@media (max-width: 480px) {
    .partners-grid-custom {
        gap: 10px !important;
    }

    .partner-item.main-partner {
        height: 90px !important;
        padding: 12px 16px !important;
    }

    .partner-item,
    .partner-item.large-partner,
    .partner-item.standard-partner {
        height: 80px !important;
        padding: 10px 10px !important;
    }
}