@import url('https://fonts.googleapis.com/css2?family=Nunito:wght@300;400;600;700&display=swap');

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

:root {
    --primary-blue: #1a73e8;
    --primary-blue-hover: #1557b0;
    --teal: #0c8484;
    --teal-dark: #096666;
    --dark-text: #1a1a1a;
    --gray-text: #757575;
    --light-gray: #b8b8b8;
    --white: #ffffff;
    --light-bg: #fafafa;
    --body-bg: #f7f5f5;
    --border-color: #e0e0e0;
    --border-light: #e6e6e6;
    --shadow-card: 0 2px 12px rgba(0, 0, 0, 0.08);
    --shadow-hover: 0 4px 20px rgba(0, 0, 0, 0.12);
    --radius: 2px;
    --transition: all 0.3s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Nunito', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--gray-text);
    line-height: 1.6;
    background-color: var(--body-bg);
    min-height: 100vh;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition);
}

a:hover {
    color: var(--primary-blue-hover);
}

img {
    max-width: 100%;
    height: auto;
}

ul {
    list-style: none;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    min-width: 96px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 400;
    cursor: pointer;
    transition: var(--transition);
    background: var(--white);
    color: var(--dark-text);
}

.btn:hover {
    border-color: var(--primary-blue);
    color: var(--primary-blue);
}

.btn-primary {
    background: var(--primary-blue);
    border-color: var(--primary-blue);
    color: var(--white);
}

.btn-primary:hover {
    background: var(--primary-blue-hover);
    border-color: var(--primary-blue-hover);
    color: var(--white);
}

.btn-teal {
    background: var(--teal);
    border-color: var(--teal);
    color: var(--white);
}

.btn-teal:hover {
    background: var(--teal-dark);
    border-color: var(--teal-dark);
    color: var(--white);
}

.text-center {
    text-align: center;
}

.text-bold {
    font-weight: 700;
}

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

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

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

.mt-1 { margin-top: 20px; }
.mt-2 { margin-top: 40px; }
.mt-3 { margin-top: 60px; }
.mb-1 { margin-bottom: 20px; }
.mb-2 { margin-bottom: 40px; }
.mb-3 { margin-bottom: 60px; }
.pt-1 { padding-top: 20px; }
.pt-2 { padding-top: 40px; }
.pt-3 { padding-top: 60px; }
.pb-1 { padding-bottom: 20px; }
.pb-2 { padding-bottom: 40px; }
.pb-3 { padding-bottom: 60px; }

.hidden { display: none !important; }
.visible { display: block !important; }

.section-title {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark-text);
    text-align: center;
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 16px;
    color: var(--gray-text);
    text-align: center;
    margin-bottom: 40px;
}

.divider {
    height: 1px;
    background: var(--border-light);
    margin: 20px 0;
}

.card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 24px;
    transition: var(--transition);
}

.card:hover {
    box-shadow: var(--shadow-hover);
}

.card-title {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 12px;
}

.card-text {
    font-size: 14px;
    color: var(--gray-text);
    line-height: 1.7;
}

/* ==================== NAVBAR ==================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 70px;
    background: var(--white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.08);
    z-index: 1000;
}

.navbar .container {
    display: flex;
    align-items: center;
    height: 100%;
    justify-content: space-between;
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
}

.navbar-logo {
    height: 40px;
    width: auto;
}

.navbar-title {
    font-size: 14px;
    font-weight: 700;
    color: var(--teal);
    line-height: 1.2;
}

.navbar-subtitle {
    font-size: 10px;
    color: var(--gray-text);
}

.navbar-nav {
    display: flex;
    align-items: center;
    gap: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    height: 70px;
    padding: 0 20px;
    color: var(--gray-text);
    font-size: 15px;
    transition: var(--transition);
}

.nav-link:hover,
.nav-link.active {
    color: var(--dark-text);
    background: rgba(26, 115, 232, 0.05);
}

.nav-link i {
    font-size: 18px;
    margin-left: 4px;
}

.nav-dropdown {
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background: var(--white);
    border: 1px solid var(--border-light);
    border-radius: var(--radius);
    box-shadow: var(--shadow-hover);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: var(--transition);
}

.nav-item:hover .nav-dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.nav-dropdown a {
    display: block;
    padding: 12px 20px;
    color: var(--dark-text);
    font-size: 14px;
    border-bottom: 1px solid var(--border-light);
}

.nav-dropdown a:last-child {
    border-bottom: none;
}

.nav-dropdown a:hover {
    background: rgba(26, 115, 232, 0.08);
    color: var(--primary-blue);
}

.navbar-actions {
    display: flex;
    align-items: center;
    gap: 12px;
}

.navbar-actions .btn {
    padding: 8px 16px;
    min-width: auto;
    font-size: 13px;
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    font-size: 28px;
    cursor: pointer;
    color: var(--dark-text);
}

.mobile-nav {
    display: none;
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background: var(--white);
    border-top: 1px solid var(--border-light);
    box-shadow: var(--shadow-hover);
    z-index: 999;
}

.mobile-nav.active {
    display: block;
}

.mobile-nav a {
    display: block;
    padding: 15px 20px;
    color: var(--dark-text);
    font-size: 15px;
    border-bottom: 1px solid var(--border-light);
}

.mobile-nav a:hover {
    background: rgba(26, 115, 232, 0.08);
    color: var(--primary-blue);
}

.mobile-nav .sub-menu {
    padding-left: 20px;
    background: var(--light-bg);
}

@media (max-width: 992px) {
    .navbar-nav {
        display: none;
    }
    
    .navbar-actions {
        display: none;
    }
    
    .mobile-menu-btn {
        display: block;
    }
}

/* ==================== BANNER ==================== */
.banner {
    position: relative;
    width: 100vw;
    margin-left: calc(-50vw + 50%);
    margin-top: 70px;
    overflow: hidden;
}

.banner img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top;
    display: block;
    max-height: 500px;
}

@media (max-width: 768px) {
    .banner img {
        max-height: 250px;
    }
}

/* ==================== HERO SECTION ==================== */
.hero {
    background: linear-gradient(135deg, var(--teal) 0%, #0a6b6b 50%, var(--primary-blue) 100%);
    color: var(--white);
    padding: 160px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 800 400'%3E%3Cdefs%3E%3ClinearGradient id='g1' x1='0%25' y1='0%25' x2='100%25' y2='100%25'%3E%3Cstop offset='0%25' stop-color='%23ffffff' stop-opacity='0.05'/%3E%3Cstop offset='100%25' stop-color='%23ffffff' stop-opacity='0.02'/%3E%3C/linearGradient%3E%3C/defs%3E%3Ccircle cx='100' cy='80' r='35' fill='none' stroke='%23ffffff' stroke-width='1.5' opacity='0.15'/%3E%3Ccircle cx='100' cy='80' r='25' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.12'/%3E%3Ccircle cx='100' cy='80' r='8' fill='%23ffffff' opacity='0.1'/%3E%3Ccircle cx='100' cy='80' r='4' fill='%23ffffff' opacity='0.15'/%3E%3Cline x1='65' y1='80' x2='135' y2='80' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Cline x1='100' y1='45' x2='100' y2='115' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Ccircle cx='700' cy='320' r='40' fill='none' stroke='%23ffffff' stroke-width='1.5' opacity='0.12'/%3E%3Ccircle cx='700' cy='320' r='28' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Ccircle cx='700' cy='320' r='10' fill='%23ffffff' opacity='0.08'/%3E%3Ccircle cx='700' cy='320' r='5' fill='%23ffffff' opacity='0.12'/%3E%3Cpath d='M670 320 L730 320 M700 290 L700 350' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Ccircle cx='650' cy='100' r='20' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Ccircle cx='650' cy='100' r='12' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.08'/%3E%3Ccircle cx='650' cy='100' r='4' fill='%23ffffff' opacity='0.1'/%3E%3Ccircle cx='180' cy='300' r='25' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.1'/%3E%3Ccircle cx='180' cy='300' r='15' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.08'/%3E%3Ccircle cx='180' cy='300' r='5' fill='%23ffffff' opacity='0.08'/%3E%3Crect x='720' y='60' width='50' height='70' fill='none' stroke='%23ffffff' stroke-width='1.2' opacity='0.1' rx='3'/%3E%3Cline x1='720' y1='85' x2='770' y2='85' stroke='%23ffffff' stroke-width='0.8' opacity='0.08'/%3E%3Cline x1='720' y1='105' x2='770' y2='105' stroke='%23ffffff' stroke-width='0.8' opacity='0.08'/%3E%3Crect x='730' y='70' width='8' height='8' fill='%23ffffff' opacity='0.08'/%3E%3Crect x='742' y='70' width='8' height='8' fill='%23ffffff' opacity='0.08'/%3E%3Crect x='754' y='70' width='8' height='8' fill='%23ffffff' opacity='0.08'/%3E%3Crect x='730' y='90' width='8' height='8' fill='%23ffffff' opacity='0.06'/%3E%3Crect x='742' y='90' width='8' height='8' fill='%23ffffff' opacity='0.06'/%3E%3Crect x='754' y='90' width='8' height='8' fill='%23ffffff' opacity='0.06'/%3E%3Cpath d='M60 200 L80 220 L100 200 L120 220 L140 200' fill='none' stroke='%23ffffff' stroke-width='1.2' opacity='0.08'/%3E%3Cpath d='M60 210 L80 230 L100 210 L120 230 L140 210' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3Ccircle cx='750' cy='180' r='15' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.08'/%3E%3Ccircle cx='750' cy='180' r='8' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3Ccircle cx='50' cy='150' r='12' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.08'/%3E%3Ccircle cx='50' cy='150' r='6' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3Crect x='200' y='50' width='30' height='40' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.08' rx='2'/%3E%3Cline x1='200' y1='65' x2='230' y2='65' stroke='%23ffffff' stroke-width='0.6' opacity='0.06'/%3E%3Cline x1='200' y1='75' x2='230' y2='75' stroke='%23ffffff' stroke-width='0.6' opacity='0.06'/%3E%3Ccircle cx='550' cy='350' r='18' fill='none' stroke='%23ffffff' stroke-width='1' opacity='0.08'/%3E%3Ccircle cx='550' cy='350' r='10' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3Ccircle cx='550' cy='350' r='4' fill='%23ffffff' opacity='0.08'/%3E%3Cpath d='M530 330 L550 350 L570 330' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3Cpath d='M530 370 L550 350 L570 370' fill='none' stroke='%23ffffff' stroke-width='0.8' opacity='0.06'/%3E%3C/svg%3E");
    opacity: 1;
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

.hero-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.2);
    padding: 12px 36px;
    border-radius: 30px;
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 40px;
    backdrop-filter: blur(10px);
}

.hero-title {
    font-size: 72px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 30px;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-organizer {
    font-size: 18px;
    margin-bottom: 8px;
    opacity: 0.85;
}

.hero-organizer-name {
    font-size: 22px;
    font-weight: 600;
    margin-bottom: 8px;
}

.hero-subtitle {
    font-size: 22px;
    font-weight: 300;
    margin-bottom: 15px;
    opacity: 0.95;
}

.hero-info {
    font-size: 16px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-info i {
    margin: 0 8px;
}

.hero-title span {
    color: #ffd700;
}

.hero-subtitle {
    font-size: 22px;
    font-weight: 300;
    margin-bottom: 15px;
    opacity: 0.95;
}

.hero-info {
    font-size: 16px;
    margin-bottom: 40px;
    opacity: 0.9;
}

.hero-info i {
    margin: 0 8px;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

.hero-buttons .btn {
    padding: 14px 32px;
    font-size: 16px;
    min-width: 160px;
}

.hero-buttons .btn-outline {
    background: transparent;
    border: 2px solid var(--white);
    color: var(--white);
}

.hero-buttons .btn-outline:hover {
    background: var(--white);
    color: var(--teal);
}

@media (max-width: 768px) {
    .hero {
        padding: 140px 0 60px;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .hero-badge {
        font-size: 22px;
        padding: 10px 28px;
    }
    
    .hero-organizer {
        font-size: 16px;
    }
    
    .hero-organizer-name {
        font-size: 18px;
    }
}

/* ==================== PAGE HEADER ==================== */
.page-header {
    background: linear-gradient(135deg, var(--teal) 0%, var(--primary-blue) 100%);
    color: var(--white);
    padding: 80px 0 40px;
    text-align: center;
    margin-top: 70px;
}

/* ==================== COUNTDOWN SECTION ==================== */
.countdown-section {
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    padding: 40px 0;
    border-bottom: 1px solid var(--border-color);
}

.countdown-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.countdown-label {
    font-size: 16px;
    color: var(--gray-text);
    text-transform: uppercase;
    letter-spacing: 3px;
    font-weight: 600;
}

.countdown-grid {
    display: flex;
    gap: 25px;
    flex-wrap: wrap;
    justify-content: center;
}

.countdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 130px;
    padding: 25px 20px;
    border-radius: 20px;
    background: var(--white);
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.08);
    transition: transform 0.3s ease;
}

.countdown-item:hover {
    transform: translateY(-5px);
}

.countdown-icon {
    font-size: 32px;
    margin-bottom: 10px;
}

.countdown-number {
    font-size: 48px;
    font-weight: 800;
    line-height: 1;
}

.countdown-unit {
    font-size: 13px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 2px;
    margin-top: 8px;
}

.countdown-item.color-days {
    background: linear-gradient(135deg, #fff3e0 0%, #ffe0b2 100%);
}
.countdown-item.color-days .countdown-icon { color: #ff9800; }
.countdown-item.color-days .countdown-number { color: #e65100; }
.countdown-item.color-days .countdown-unit { color: #f57c00; }

.countdown-item.color-hours {
    background: linear-gradient(135deg, #e3f2fd 0%, #bbdefb 100%);
}
.countdown-item.color-hours .countdown-icon { color: #2196f3; }
.countdown-item.color-hours .countdown-number { color: #0d47a1; }
.countdown-item.color-hours .countdown-unit { color: #1976d2; }

.countdown-item.color-mins {
    background: linear-gradient(135deg, #e8f5e9 0%, #c8e6c9 100%);
}
.countdown-item.color-mins .countdown-icon { color: #4caf50; }
.countdown-item.color-mins .countdown-number { color: #1b5e20; }
.countdown-item.color-mins .countdown-unit { color: #388e3c; }

.countdown-item.color-secs {
    background: linear-gradient(135deg, #f3e5f5 0%, #e1bee7 100%);
}
.countdown-item.color-secs .countdown-icon { color: #9c27b0; }
.countdown-item.color-secs .countdown-number { color: #4a148c; }
.countdown-item.color-secs .countdown-unit { color: #7b1fa2; }

.page-header h1 {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 10px;
}

.page-header p {
    font-size: 18px;
    opacity: 0.9;
}

/* ==================== MAIN CONTENT ==================== */
.main-content {
    min-height: calc(100vh - 200px);
    padding: 60px 0;
}

.content-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 40px;
    margin-bottom: 30px;
    box-shadow: var(--shadow-card);
}

.content-card h2 {
    font-size: 24px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 20px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--primary-blue);
}

.content-card h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-text);
    margin: 25px 0 15px;
}

.content-card p {
    font-size: 15px;
    line-height: 1.8;
    margin-bottom: 15px;
}

.content-card ul {
    padding-left: 20px;
    margin-bottom: 20px;
}

.content-card ul li {
    position: relative;
    padding-left: 20px;
    margin-bottom: 10px;
    font-size: 15px;
    line-height: 1.7;
}

.content-card ul li::before {
    content: '';
    position: absolute;
    left: 0;
    top: 10px;
    width: 6px;
    height: 6px;
    background: var(--primary-blue);
    border-radius: 50%;
}

/* ==================== INFO GRID ==================== */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.info-box {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.info-box:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.info-box-thumb {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 25px;
    box-shadow: 0 8px 25px rgba(0, 102, 153, 0.25);
}

.info-box-thumb .material-icons {
    font-size: 48px;
    color: var(--white);
}

.info-box-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.info-box-icon i {
    font-size: 32px;
    color: var(--white);
}

.info-box h3 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 10px;
}

.info-box p {
    font-size: 14px;
    color: var(--gray-text);
    line-height: 1.6;
}

/* ==================== IMPORTANT DATES ==================== */
.dates-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.date-item {
    background: var(--light-bg);
    border-left: 4px solid var(--primary-blue);
    padding: 20px;
    border-radius: var(--radius);
}

.date-item.highlight {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    color: var(--white);
}

.date-item.highlight .date-label,
.date-item.highlight .date-value {
    color: var(--white);
}

.date-label {
    font-size: 13px;
    color: var(--gray-text);
    margin-bottom: 5px;
}

.date-value {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-text);
}

/* ==================== TOPICS GRID ==================== */
.topics-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.topic-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 25px;
    transition: var(--transition);
    cursor: pointer;
}

.topic-card:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-hover);
    transform: translateY(-3px);
}

.topic-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 15px;
}

.topic-card-icon .material-icons {
    font-size: 24px;
}

.topic-card-icon.color-energy { background: rgba(255, 193, 7, 0.15); }
.topic-card-icon.color-energy .material-icons { color: #f59e0b; }

.topic-card-icon.color-nano { background: rgba(156, 39, 176, 0.15); }
.topic-card-icon.color-nano .material-icons { color: #9c27b0; }

.topic-card-icon.color-hydrogen { background: rgba(76, 175, 80, 0.15); }
.topic-card-icon.color-hydrogen .material-icons { color: #4caf50; }

.topic-card-icon.color-fuel { background: rgba(244, 67, 54, 0.15); }
.topic-card-icon.color-fuel .material-icons { color: #f44336; }

.topic-card-icon.color-solar { background: rgba(255, 193, 7, 0.2); }
.topic-card-icon.color-solar .material-icons { color: #ff9800; }

.topic-card-icon.color-thermal { background: rgba(244, 67, 54, 0.15); }
.topic-card-icon.color-thermal .material-icons { color: #e53935; }

.topic-card-icon.color-polymer { background: rgba(33, 150, 243, 0.15); }
.topic-card-icon.color-polymer .material-icons { color: #2196f3; }

.topic-card-icon.color-crystal { background: rgba(156, 39, 176, 0.12); }
.topic-card-icon.color-crystal .material-icons { color: #8e24aa; }

.topic-card-icon.color-catalysis { background: rgba(0, 150, 136, 0.15); }
.topic-card-icon.color-catalysis .material-icons { color: #009688; }

.topic-card-icon.color-bio { background: rgba(76, 175, 80, 0.15); }
.topic-card-icon.color-bio .material-icons { color: #43a047; }

.topic-card-icon.color-carbon { background: rgba(69, 90, 100, 0.15); }
.topic-card-icon.color-carbon .material-icons { color: #455a64; }

.topic-card-icon.color-battery { background: rgba(33, 150, 243, 0.15); }
.topic-card-icon.color-battery .material-icons { color: #1976d2; }

.topic-card-icon.color-optical { background: rgba(233, 30, 99, 0.15); }
.topic-card-icon.color-optical .material-icons { color: #e91e63; }

.topic-card-icon.color-harvest { background: rgba(255, 193, 7, 0.18); }
.topic-card-icon.color-harvest .material-icons { color: #ffa000; }

.topic-card-icon.color-capacitor { background: rgba(103, 58, 183, 0.15); }
.topic-card-icon.color-capacitor .material-icons { color: #673ab7; }

.topic-card-icon.color-emerging { background: rgba(0, 188, 212, 0.15); }
.topic-card-icon.color-emerging .material-icons { color: #00bcd4; }

.topic-card-icon.color-ai { background: rgba(121, 85, 72, 0.15); }
.topic-card-icon.color-ai .material-icons { color: #795548; }

.topic-card-icon.color-ml { background: rgba(96, 125, 139, 0.15); }
.topic-card-icon.color-ml .material-icons { color: #607d8b; }

.topic-card-icon.color-informatics { background: rgba(0, 150, 136, 0.12); }
.topic-card-icon.color-informatics .material-icons { color: #00897b; }

.topic-card-icon.color-smart { background: rgba(156, 39, 176, 0.12); }
.topic-card-icon.color-smart .material-icons { color: #7b1fa2; }

.topic-card-icon.color-data { background: rgba(33, 150, 243, 0.12); }
.topic-card-icon.color-data .material-icons { color: #1e88e5; }

.topic-card-icon.color-compute { background: rgba(63, 81, 181, 0.15); }
.topic-card-icon.color-compute .material-icons { color: #3f51b5; }

.topic-card-icon.color-smart-energy { background: rgba(76, 175, 80, 0.12); }
.topic-card-icon.color-smart-energy .material-icons { color: #388e3c; }

.topic-card h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 8px;
}

.topic-card p {
    font-size: 13px;
    color: var(--gray-text);
    line-height: 1.6;
}

/* ==================== SPEAKERS GRID ==================== */
.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.speaker-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.speaker-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.speaker-image {
    width: 100%;
    height: 220px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 64px;
    font-weight: 700;
    color: var(--white);
    overflow: hidden;
}

.speaker-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.speaker-info {
    padding: 25px;
}

.speaker-info h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 5px;
}

.speaker-affiliation {
    font-size: 14px;
    color: var(--primary-blue);
    margin-bottom: 10px;
}

.speaker-topic {
    font-size: 13px;
    color: var(--gray-text);
    font-style: italic;
}

.speaker-type {
    display: inline-block;
    padding: 4px 12px;
    background: var(--primary-blue);
    color: var(--white);
    font-size: 11px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 10px;
}

.speaker-type.keynote {
    background: #e74c3c;
}

.speaker-type.invited {
    background: var(--teal);
}

/* ==================== TABLE STYLES ==================== */
.table-responsive {
    overflow-x: auto;
    margin: 30px 0;
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-card);
}

.data-table thead {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    color: var(--white);
}

.data-table th,
.data-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--border-light);
}

.data-table th {
    font-weight: 600;
    font-size: 14px;
}

.data-table td {
    font-size: 14px;
    color: var(--gray-text);
}

.data-table tbody tr:hover {
    background: var(--light-bg);
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

/* ==================== TABS ==================== */
.tabs {
    margin: 30px 0;
}

.tabs-nav {
    display: flex;
    border-bottom: 2px solid var(--border-light);
    margin-bottom: 30px;
    overflow-x: auto;
}

.tab-btn {
    padding: 15px 30px;
    background: transparent;
    border: none;
    font-size: 15px;
    font-weight: 600;
    color: var(--gray-text);
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    position: relative;
}

.tab-btn:hover {
    color: var(--dark-text);
}

.tab-btn.active {
    color: var(--primary-blue);
}

.tab-btn.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-blue);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ==================== COMMITTEE LIST ==================== */
.committee-section {
    margin: 40px 0;
}

.committee-section h3 {
    font-size: 24px;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-blue), var(--teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 25px;
    padding-bottom: 10px;
    border-bottom: 2px solid var(--primary-blue);
}

.committee-section h3 .material-icons {
    background: linear-gradient(135deg, var(--primary-blue), var(--teal));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.committee-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.committee-member {
    background: var(--light-bg);
    padding: 20px;
    border-radius: var(--radius);
    border-left: 4px solid var(--primary-blue);
}

.committee-member h4 {
    font-size: 16px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 5px;
}

.committee-member p {
    font-size: 13px;
    color: var(--gray-text);
}

.committee-member .role {
    display: inline-block;
    padding: 3px 10px;
    background: var(--primary-blue);
    color: var(--white);
    font-size: 11px;
    font-weight: 600;
    border-radius: 20px;
    margin-bottom: 8px;
}

/* ==================== SCHEDULE TIMELINE ==================== */
.schedule-day {
    margin-bottom: 40px;
}

.schedule-day h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 25px;
    padding: 15px 25px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    color: var(--white);
    border-radius: var(--radius);
}

.timeline {
    position: relative;
    padding-left: 30px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 3px;
    background: var(--border-light);
}

.timeline-item {
    position: relative;
    padding: 20px 25px;
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    margin-bottom: 20px;
    margin-left: 20px;
    transition: var(--transition);
}

.timeline-item:hover {
    box-shadow: var(--shadow-hover);
    transform: translateX(5px);
}

.timeline-item::before {
    content: '';
    position: absolute;
    left: -29px;
    top: 25px;
    width: 12px;
    height: 12px;
    background: var(--primary-blue);
    border: 3px solid var(--white);
    border-radius: 50%;
    box-shadow: 0 0 0 3px var(--primary-blue);
}

.timeline-time {
    font-size: 14px;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 8px;
}

.timeline-title {
    font-size: 17px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 8px;
}

.timeline-speaker {
    font-size: 14px;
    color: var(--teal);
    margin-bottom: 5px;
}

.timeline-location {
    font-size: 13px;
    color: var(--gray-text);
}

.timeline-location i {
    margin-right: 5px;
}

/* ==================== SPONSOR TIERS ==================== */
.sponsor-tier {
    margin-bottom: 50px;
}

.sponsor-tier h3 {
    font-size: 22px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 25px;
    text-align: center;
}

.tier-platinum h3 { color: #e74c3c; }
.tier-gold h3 { color: #f39c12; }
.tier-silver h3 { color: #95a5a6; }
.tier-bronze h3 { color: #cd6133; }

.sponsor-grid {
    display: grid;
    gap: 30px;
    justify-content: center;
}

.sponsor-grid.platinum {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.sponsor-grid.gold {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.sponsor-grid.silver {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

.sponsor-grid.bronze {
    grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}

.sponsor-logo {
    background: var(--white);
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 150px;
    transition: var(--transition);
}

.sponsor-logo:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-hover);
}

.sponsor-logo-placeholder {
    text-align: center;
}

.sponsor-logo-placeholder i {
    font-size: 48px;
    color: var(--gray-text);
    margin-bottom: 10px;
}

.sponsor-logo-placeholder span {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-text);
}

/* ==================== HOTEL CARDS ==================== */
.hotel-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.hotel-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    overflow: hidden;
    transition: var(--transition);
}

.hotel-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.hotel-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(135deg, var(--teal) 0%, var(--primary-blue) 100%);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hotel-image i {
    font-size: 64px;
    color: var(--white);
    opacity: 0.8;
}

.hotel-details {
    padding: 25px;
}

.hotel-details h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 10px;
}

.hotel-details p {
    font-size: 14px;
    color: var(--gray-text);
    margin-bottom: 10px;
}

.hotel-price {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-blue);
    margin: 15px 0;
}

.hotel-price span {
    font-size: 13px;
    font-weight: 400;
    color: var(--gray-text);
}

/* ==================== AWARD CARDS ==================== */
.award-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.award-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    color: var(--white);
    padding: 40px 30px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.award-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.award-icon {
    width: 80px;
    height: 80px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.award-icon i {
    font-size: 40px;
}

.award-card h4 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 15px;
}

.award-card p {
    font-size: 14px;
    opacity: 0.9;
    line-height: 1.7;
}

/* ==================== FORMS ==================== */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    color: var(--dark-text);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 12px 15px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 3px rgba(26, 115, 232, 0.1);
}

.form-control::placeholder {
    color: var(--light-gray);
}

textarea.form-control {
    min-height: 120px;
    resize: vertical;
}

select.form-control {
    cursor: pointer;
    background: var(--white);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
}

.form-checkbox {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
}

.form-checkbox input {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.form-checkbox label {
    font-size: 14px;
    color: var(--gray-text);
    cursor: pointer;
}

/* ==================== GOOGLE FORM EMBED ==================== */
.google-form-embed {
    margin: 40px 0;
}

.google-form-embed iframe {
    width: 100%;
    min-height: 600px;
    border: none;
    border-radius: var(--radius);
    box-shadow: var(--shadow-card);
}

.form-placeholder {
    background: var(--light-bg);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius);
    padding: 60px;
    text-align: center;
    min-height: 400px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.form-placeholder i {
    font-size: 64px;
    color: var(--gray-text);
    margin-bottom: 20px;
}

.form-placeholder h4 {
    font-size: 20px;
    color: var(--dark-text);
    margin-bottom: 10px;
}

.form-placeholder p {
    font-size: 14px;
    color: var(--gray-text);
}

/* ==================== CONTACT INFO ==================== */
.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.contact-card {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 30px;
    text-align: center;
    transition: var(--transition);
}

.contact-card:hover {
    box-shadow: var(--shadow-hover);
    transform: translateY(-5px);
}

.contact-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--teal) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

.contact-icon i {
    font-size: 30px;
    color: var(--white);
}

.contact-card h4 {
    font-size: 18px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 15px;
}

.contact-card p {
    font-size: 14px;
    color: var(--gray-text);
    line-height: 1.7;
}

.contact-card a {
    color: var(--primary-blue);
}

/* ==================== DOWNLOAD LIST ==================== */
.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.download-item {
    background: var(--white);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 25px;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: var(--transition);
}

.download-item:hover {
    border-color: var(--primary-blue);
    box-shadow: var(--shadow-hover);
}

.download-icon {
    width: 60px;
    height: 60px;
    background: rgba(26, 115, 232, 0.1);
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.download-icon i {
    font-size: 28px;
    color: var(--primary-blue);
}

.download-info {
    flex: 1;
}

.download-info h4 {
    font-size: 15px;
    font-weight: 700;
    color: var(--dark-text);
    margin-bottom: 5px;
}

.download-info p {
    font-size: 13px;
    color: var(--gray-text);
}

.download-btn {
    padding: 10px 20px;
    background: var(--primary-blue);
    color: var(--white);
    border: none;
    border-radius: var(--radius);
    font-size: 13px;
    cursor: pointer;
    transition: var(--transition);
}

.download-btn:hover {
    background: var(--primary-blue-hover);
}

/* ==================== MODAL ==================== */
.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: var(--white);
    border-radius: var(--radius);
    width: 90%;
    max-width: 450px;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: var(--transition);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border-light);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-header h3 {
    font-size: 20px;
    font-weight: 700;
    color: var(--dark-text);
}

.modal-close {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: var(--gray-text);
    transition: var(--transition);
}

.modal-close:hover {
    color: var(--dark-text);
}

.modal-body {
    padding: 30px;
}

.modal-tabs {
    display: flex;
    border-bottom: 2px solid var(--border-light);
    margin-bottom: 25px;
}

.modal-tab {
    flex: 1;
    padding: 12px;
    background: transparent;
    border: none;
    font-size: 14px;
    font-weight: 600;
    color: var(--gray-text);
    cursor: pointer;
    transition: var(--transition);
    position: relative;
}

.modal-tab.active {
    color: var(--primary-blue);
}

.modal-tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary-blue);
}

/* ==================== FOOTER ==================== */
.footer {
    background: var(--teal);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(255, 255, 255, 0.3);
}

.footer-section ul li {
    margin-bottom: 12px;
}

.footer-section ul li a {
    color: rgba(255, 255, 255, 0.8);
    font-size: 14px;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--white);
    padding-left: 5px;
}

.footer-contact p {
    font-size: 14px;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.footer-contact i {
    width: 20px;
}

.footer-bottom {
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    opacity: 0.8;
}

.footer-logo {
    margin-bottom: 20px;
}

.footer-logo h3 {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 5px;
}

.footer-logo p {
    font-size: 12px;
    opacity: 0.8;
}

/* ==================== UTILITIES ==================== */
.text-justify {
    text-align: justify;
}

.m-0 { margin: 0; }
.p-0 { padding: 0; }

.flex {
    display: flex;
}

.flex-center {
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.gap-1 { gap: 10px; }
.gap-2 { gap: 20px; }
.gap-3 { gap: 30px; }

.w-100 { width: 100%; }

/* ==================== RESPONSIVE ==================== */
@media (max-width: 768px) {
    .section-title {
        font-size: 24px;
    }
    
    .hero-title {
        font-size: 28px;
    }
    
    .hero-subtitle {
        font-size: 16px;
    }
    
    .page-header {
        padding: 100px 0 40px;
    }
    
    .page-header h1 {
        font-size: 28px;
    }
    
    .content-card {
        padding: 25px;
    }
    
    .info-grid,
    .topics-grid,
    .speakers-grid,
    .hotel-grid,
    .award-grid {
        grid-template-columns: 1fr;
    }
    
    .tabs-nav {
        flex-wrap: nowrap;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
    
    .tab-btn {
        padding: 12px 20px;
        font-size: 14px;
    }
    
    .data-table th,
    .data-table td {
        padding: 12px 15px;
        font-size: 13px;
    }
    
    .timeline {
        padding-left: 20px;
    }
    
    .timeline-item {
        margin-left: 15px;
        padding: 15px 20px;
    }
    
    .timeline-item::before {
        left: -24px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .hero-buttons .btn {
        width: 100%;
        max-width: 250px;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
}

/* ==================== ANIMATIONS ==================== */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

.fade-in {
    animation: fadeIn 0.6s ease forwards;
}

.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible {
    opacity: 1;
    transform: translateY(0);
}

/* ==================== PRINT STYLES ==================== */
@media print {
    .navbar,
    .footer,
    .btn,
    .modal-overlay {
        display: none !important;
    }
    
    .main-content {
        padding: 20px 0;
    }
    
    .content-card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}

.form-iframe-container {
    width: 100%;
    overflow: hidden;
    margin-top: 20px;
}

.form-iframe-container iframe {
    width: 100%;
    min-height: 900px;
    border: none;
}