/* ===========================================
   Youth Innovation Project #3 - Styles
   Theme: Blue-Pink Gradient (iSTEM-Ed 2026)
   =========================================== */

/* CSS Variables */
:root {
    /* Primary Colors - Navy Blue */
    --primary-navy: #0a1628;
    --primary-blue: #1a237e;
    --secondary-blue: #3949ab;
    --deep-blue: #0d1f42;

    /* Accent Colors - Pink/Magenta */
    --accent-pink: #ff6fd8;
    --accent-magenta: #ec4899;
    --accent-light-pink: #ff83f6;

    /* Supporting Colors */
    --accent-orange: #ff6b35;
    --success-color: #10b981;
    --warning-color: #f59e0b;

    /* Text Colors */
    --text-white: #ffffff;
    --text-dark: #1e293b;
    --text-muted: #64748b;

    /* Background Colors */
    --bg-light: #f0f4ff;
    --card-bg: #ffffff;

    /* Effects */
    --shadow-sm: 0 2px 10px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 20px 50px rgba(0, 0, 0, 0.2);
    --shadow-pink: 0 4px 25px rgba(236, 72, 153, 0.4);
    --shadow-blue: 0 4px 25px rgba(26, 35, 126, 0.3);

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 50px;

    /* Transitions */
    --transition: 0.3s ease;
    --transition-slow: 0.5s ease;
}

/* Reset & Base */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Sarabun', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(180deg, var(--primary-navy) 0%, var(--deep-blue) 50%, var(--primary-blue) 100%);
    background-attachment: fixed;
    color: var(--text-dark);
    line-height: 1.7;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* ========== Logo Banner ========== */
.logo-banner {
    background: linear-gradient(rgba(255, 255, 255, 0.9), rgba(255, 255, 255, 0.9)), url('../images/bg.jpg');
    background-size: cover;
    background-position: center;
    padding: 16px 0;
    border-bottom: 2px solid rgba(236, 72, 153, 0.2);
}

.logo-grid {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 32px;
    flex-wrap: wrap;
}

.partner-logo {
    max-height: 50px;
    width: auto;
    object-fit: contain;
    opacity: 0.9;
    transition: var(--transition);
}

.partner-logo:hover {
    opacity: 1;
    transform: scale(1.05);
}

/* ========== Main Header ========== */
.main-header {
    background: rgba(10, 22, 40, 0.95);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    padding: 16px 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid rgba(255, 111, 216, 0.3);
}

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

.logo h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.4rem;
    font-weight: 800;
    background: linear-gradient(135deg, #fff 0%, var(--accent-pink) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.logo span {
    display: block;
    font-size: 0.75rem;
    color: var(--accent-light-pink);
    letter-spacing: 3px;
    font-weight: 600;
    text-transform: uppercase;
}

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

.desktop-nav a {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    padding: 10px 18px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.desktop-nav a:hover {
    background: rgba(255, 111, 216, 0.2);
    color: var(--accent-pink);
}

.btn-nav-register {
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-magenta)) !important;
    color: white !important;
    box-shadow: var(--shadow-pink);
}

.btn-nav-register:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(236, 72, 153, 0.5) !important;
}

/* Mobile Menu Button */
.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 8px;
}

.mobile-menu-btn span {
    display: block;
    width: 28px;
    height: 3px;
    background: var(--text-white);
    border-radius: 2px;
    transition: var(--transition);
}

/* Mobile Navigation */
.mobile-nav {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100vh;
    background: rgba(10, 22, 40, 0.98);
    backdrop-filter: blur(20px);
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 24px;
    z-index: 999;
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
}

.mobile-nav.active {
    opacity: 1;
    pointer-events: all;
}

.mobile-nav a {
    color: var(--text-white);
    text-decoration: none;
    font-size: 1.4rem;
    font-weight: 600;
    padding: 12px 32px;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.mobile-nav a:hover {
    background: rgba(255, 111, 216, 0.2);
    color: var(--accent-pink);
}

/* ========== Hero Section ========== */
.hero-section {
    position: relative;
    background: linear-gradient(135deg,
            rgba(26, 35, 126, 0.95) 0%,
            rgba(57, 73, 171, 0.9) 30%,
            rgba(156, 39, 176, 0.85) 70%,
            rgba(236, 72, 153, 0.8) 100%), url('../images/bg.jpg');
    min-height: 85vh;
    display: flex;
    align-items: center;
    padding: 80px 0;
    overflow: hidden;
}

.hero-bg-shapes {
    position: absolute;
    inset: 0;
    overflow: hidden;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.4;
}

.shape-1 {
    width: 500px;
    height: 500px;
    background: var(--accent-pink);
    top: -150px;
    right: -100px;
    animation: float 8s ease-in-out infinite;
}

.shape-2 {
    width: 400px;
    height: 400px;
    background: var(--secondary-blue);
    bottom: -100px;
    left: -100px;
    animation: float 10s ease-in-out infinite reverse;
}

.shape-3 {
    width: 300px;
    height: 300px;
    background: var(--accent-magenta);
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    animation: pulse 6s ease-in-out infinite;
}

@keyframes float {

    0%,
    100% {
        transform: translateY(0) rotate(0deg);
    }

    50% {
        transform: translateY(-30px) rotate(5deg);
    }
}

@keyframes pulse {

    0%,
    100% {
        transform: translate(-50%, -50%) scale(1);
        opacity: 0.3;
    }

    50% {
        transform: translate(-50%, -50%) scale(1.1);
        opacity: 0.5;
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    color: var(--text-white);
}

.event-badge {
    display: inline-block;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    padding: 12px 28px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
    margin-bottom: 28px;
    border: 1px solid rgba(255, 255, 255, 0.25);
}

.hero-title {
    font-family: 'Montserrat', sans-serif;
    margin-bottom: 16px;
}

.title-line {
    display: block;
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.1;
    letter-spacing: -1px;
}

.title-line.highlight {
    background: linear-gradient(135deg, var(--accent-pink) 0%, var(--accent-light-pink) 50%, #fff 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-theme {
    font-family: 'Montserrat', sans-serif;
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--accent-light-pink);
    margin-bottom: 20px;
    text-shadow: 0 2px 20px rgba(255, 131, 246, 0.5);
}

.hero-subtitle {
    font-size: 1.2rem;
    opacity: 0.95;
    margin-bottom: 40px;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
    line-height: 1.8;
}

.hero-meta {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-bottom: 40px;
}

.meta-card {
    display: flex;
    align-items: center;
    gap: 12px;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 16px 24px;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.meta-card:hover {
    background: rgba(255, 255, 255, 0.18);
    transform: translateY(-4px);
    border-color: rgba(255, 111, 216, 0.4);
}

.meta-icon {
    font-size: 2rem;
}

.meta-text {
    text-align: left;
}

.meta-text strong {
    display: block;
    font-size: 0.85rem;
    opacity: 0.8;
    font-weight: 500;
}

.meta-text span {
    font-size: 1rem;
    font-weight: 600;
}

.hero-cta {
    display: flex;
    justify-content: center;
    gap: 16px;
    flex-wrap: wrap;
}

.btn-primary {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--accent-orange) 0%, #ff8c5a 100%);
    color: white;
    padding: 18px 36px;
    border-radius: var(--radius-md);
    font-size: 1.15rem;
    font-weight: 700;
    text-decoration: none;
    box-shadow: 0 8px 30px rgba(255, 107, 53, 0.4);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left 0.5s ease;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 40px rgba(255, 107, 53, 0.5);
}

.btn-primary .btn-icon {
    font-size: 1.3rem;
    transition: transform var(--transition);
}

.btn-primary:hover .btn-icon {
    transform: translateX(4px);
}

.btn-secondary {
    display: inline-flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    padding: 18px 32px;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border: 2px solid rgba(255, 255, 255, 0.3);
    transition: var(--transition);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-2px);
}

/* ========== About Section ========== */
.about-section {
    padding: 80px 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.02) 0%, rgba(255, 255, 255, 0.08) 100%);
}

.section-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 48px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

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

.title-icon {
    font-size: 1.6rem;
}

.about-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 24px;
    margin-bottom: 40px;
}

.about-card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 28px;
    box-shadow: var(--shadow-lg);
    transition: var(--transition);
}

.about-card:hover {
    transform: translateY(-6px);
    box-shadow: 0 25px 60px rgba(0, 0, 0, 0.25);
}

.about-card.main-card {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 60%, #7c3aed 100%);
    color: var(--text-white);
    grid-row: span 2;
}

.about-card h3 {
    font-size: 1.2rem;
    font-weight: 700;
    margin-bottom: 16px;
    color: inherit;
}

.about-card.main-card h3 {
    color: var(--accent-light-pink);
}

.topic-en {
    font-size: 1.3rem;
    font-weight: 700;
    font-style: italic;
    margin-bottom: 8px;
    color: var(--accent-light-pink);
}

.topic-th {
    font-size: 1.1rem;
    margin-bottom: 16px;
    line-height: 1.6;
}

.topic-desc {
    font-size: 0.95rem;
    opacity: 0.9;
    padding-top: 16px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.btn-call-for-paper {
    display: inline-block;
    margin-top: 20px;
    padding: 12px 24px;
    background: transparent;
    border: 2px solid rgba(255, 255, 255, 0.8);
    color: white;
    text-decoration: none;
    font-weight: 600;
    font-size: 0.95rem;
    border-radius: var(--radius-md);
    transition: var(--transition);
}

.btn-call-for-paper:hover {
    background: rgba(255, 255, 255, 0.15);
    border-color: white;
    transform: translateY(-2px);
    box-shadow: 0 4px 15px rgba(255, 255, 255, 0.2);
}

.eligibility-list,
.fee-list {
    list-style: none;
}

.eligibility-list li,
.fee-list li {
    padding: 8px 0;
    padding-left: 28px;
    position: relative;
    font-size: 0.95rem;
}

.eligibility-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-color);
    font-weight: bold;
}

.fee-list li::before {
    content: '💎';
    position: absolute;
    left: 0;
}

.fee-note {
    font-size: 0.85rem !important;
    color: var(--text-muted);
    font-style: italic;
}

.organizer-info {
    text-align: center;
    color: rgba(255, 255, 255, 0.85);
}

.organizer-info p {
    margin: 8px 0;
    font-size: 1rem;
}

.organizer-info strong {
    color: var(--accent-pink);
}

/* ========== Timeline Section ========== */
.timeline-section {
    padding: 80px 0;
    background: linear-gradient(180deg,
            rgba(26, 35, 126, 0.3) 0%,
            rgba(13, 31, 66, 0.5) 100%);
}

.timeline {
    position: relative;
    max-width: 800px;
    margin: 0 auto;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 32px;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom,
            var(--accent-pink) 0%,
            var(--secondary-blue) 50%,
            var(--accent-magenta) 100%);
    border-radius: 2px;
}

.timeline-item {
    position: relative;
    padding-left: 90px;
    margin-bottom: 32px;
}

.timeline-item:last-child {
    margin-bottom: 0;
}

.timeline-marker {
    position: absolute;
    left: 0;
    top: 0;
    width: 68px;
    height: 68px;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-blue);
    border: 3px solid rgba(255, 255, 255, 0.2);
    transition: var(--transition);
}

.timeline-item.active .timeline-marker,
.timeline-item.highlight .timeline-marker {
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-magenta));
    box-shadow: var(--shadow-pink);
}

.marker-icon {
    font-size: 1.6rem;
}

.timeline-content {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    overflow: hidden;
    transition: var(--transition);
}

.timeline-item:hover .timeline-content {
    transform: translateX(8px);
    box-shadow: var(--shadow-lg);
}

.timeline-item.active .timeline-content,
.timeline-item.highlight .timeline-content {
    border: 2px solid var(--accent-pink);
}

.timeline-header {
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    padding: 16px 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 12px;
}

.timeline-item.active .timeline-header,
.timeline-item.highlight .timeline-header {
    background: linear-gradient(135deg, var(--accent-magenta) 0%, var(--accent-pink) 100%);
}

.timeline-header h3 {
    color: var(--text-white);
    font-size: 1.1rem;
    font-weight: 700;
}

.timeline-date {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    padding: 6px 14px;
    border-radius: var(--radius-full);
    font-size: 0.9rem;
    font-weight: 600;
}

.timeline-content p {
    padding: 16px 24px;
    font-size: 0.95rem;
    color: var(--text-muted);
}

/* ========== Benefits Section ========== */
.benefits-section {
    padding: 80px 0;
    background: linear-gradient(135deg,
            rgba(26, 35, 126, 0.95) 0%,
            rgba(124, 58, 237, 0.9) 50%,
            rgba(236, 72, 153, 0.85) 100%);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
}

.benefit-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 36px 24px;
    border-radius: var(--radius-lg);
    text-align: center;
    color: var(--text-white);
    transition: var(--transition);
}

.benefit-card:hover {
    transform: translateY(-8px);
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 111, 216, 0.5);
    box-shadow: 0 20px 50px rgba(236, 72, 153, 0.3);
}

.benefit-icon {
    font-size: 3rem;
    display: block;
    margin-bottom: 16px;
}

.benefit-card h3 {
    font-size: 1.15rem;
    font-weight: 700;
    margin-bottom: 6px;
}

.benefit-card p {
    font-size: 0.95rem;
    opacity: 0.85;
}

/* ========== Register Section ========== */
.register-section {
    padding: 80px 0;
    background: linear-gradient(180deg,
            rgba(10, 22, 40, 0.9) 0%,
            rgba(26, 35, 126, 0.95) 100%);
}

.register-card {
    background: var(--card-bg);
    border-radius: var(--radius-xl);
    padding: 48px;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.register-card h2 {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-blue);
    margin-bottom: 12px;
}

.register-card>p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 36px;
}

.register-methods {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 32px;
    flex-wrap: wrap;
}

.method-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

.qr-placeholder {
    width: 150px;
    height: 150px;
    background: #f8fafc;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid #e2e8f0;
}

.qr-placeholder img {
    width: 140px;
    height: 140px;
    object-fit: contain;
}

.method-divider {
    color: var(--text-muted);
    font-weight: 600;
    font-size: 1rem;
}

.btn-register-link {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    background: linear-gradient(135deg, var(--accent-pink), var(--accent-magenta));
    color: white;
    padding: 16px 32px;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 700;
    text-decoration: none;
    box-shadow: var(--shadow-pink);
    transition: var(--transition);
}

.btn-register-link:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 35px rgba(236, 72, 153, 0.5);
}

.register-url {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: 8px;
}

/* ========== Footer ========== */
.main-footer {
    background: var(--primary-navy);
    color: rgba(255, 255, 255, 0.85);
    padding: 60px 0 30px;
    border-top: 1px solid rgba(255, 111, 216, 0.2);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 8px;
}

.footer-brand p {
    color: var(--accent-pink);
    font-weight: 600;
}

.footer-contact h4,
.footer-links h4 {
    font-size: 1rem;
    font-weight: 700;
    color: var(--text-white);
    margin-bottom: 16px;
}

.footer-contact p {
    margin: 8px 0;
    font-size: 0.95rem;
}

.footer-contact a,
.footer-links a {
    color: var(--accent-pink);
    text-decoration: none;
    transition: var(--transition);
}

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

.footer-links {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.footer-links a {
    font-size: 0.95rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    font-size: 0.85rem;
    opacity: 0.7;
}

/* ========== Responsive Design ========== */
@media (max-width: 1024px) {
    .about-grid {
        grid-template-columns: 1fr 1fr;
    }

    .about-card.main-card {
        grid-column: span 2;
        grid-row: auto;
    }

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

@media (max-width: 768px) {
    .container {
        padding: 0 16px;
    }

    /* Header */
    .desktop-nav {
        display: none;
    }

    .mobile-menu-btn {
        display: flex;
    }

    .mobile-nav {
        display: flex;
    }

    /* Logo Banner */
    .logo-grid {
        gap: 16px;
    }

    .partner-logo {
        max-height: 36px;
    }

    /* Hero */
    .hero-section {
        min-height: auto;
        padding: 60px 0;
    }

    .title-line {
        font-size: 2.2rem;
    }

    .hero-theme {
        font-size: 1.3rem;
    }

    .hero-subtitle {
        font-size: 1rem;
    }

    .hero-meta {
        flex-direction: column;
        gap: 12px;
    }

    .meta-card {
        width: 100%;
        max-width: 320px;
    }

    .hero-cta {
        flex-direction: column;
        align-items: center;
    }

    .btn-primary,
    .btn-secondary {
        width: 100%;
        max-width: 280px;
        justify-content: center;
    }

    /* About */
    .about-grid {
        grid-template-columns: 1fr;
    }

    .about-card.main-card {
        grid-column: auto;
    }

    /* Timeline */
    .timeline::before {
        left: 22px;
    }

    .timeline-item {
        padding-left: 70px;
    }

    .timeline-marker {
        width: 48px;
        height: 48px;
    }

    .marker-icon {
        font-size: 1.2rem;
    }

    .timeline-header {
        flex-direction: column;
        align-items: flex-start;
    }

    /* Benefits */
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 16px;
    }

    .benefit-card {
        padding: 24px 16px;
    }

    .benefit-icon {
        font-size: 2.4rem;
    }

    /* Register */
    .register-card {
        padding: 32px 24px;
    }

    .register-methods {
        flex-direction: column;
    }

    /* Footer */
    .footer-content {
        grid-template-columns: 1fr;
        gap: 32px;
        text-align: center;
    }

    .footer-links {
        align-items: center;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 40px 0;
    }

    .title-line {
        font-size: 1.8rem;
    }

    .hero-theme {
        font-size: 1.1rem;
    }

    .section-title {
        font-size: 1.5rem;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .register-card h2 {
        font-size: 1.4rem;
    }
}

/* ========== Utility Classes ========== */
.text-center {
    text-align: center;
}

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

.text-pink {
    color: var(--accent-pink);
}

/* ========== Animations ========== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

/* CSS Update for Hero Section with Image */
.hero-content {
    position: relative;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 40px;
    max-width: 1100px;
    margin: 0 auto;
    color: var(--text-white);
}

.hero-image-box {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-main-img {
    max-width: 100%;
    height: auto;
    max-height: 450px;
    object-fit: contain;
    filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
    animation: float 6s ease-in-out infinite;
}

.hero-text-box {
    flex: 1.2;
    text-align: center;
}

@media (max-width: 992px) {
    .hero-content {
        flex-direction: column;
        gap: 32px;
    }

    .hero-image-box {
        order: -1;
    }

    .hero-text-box {
        width: 100%;
    }

    .hero-main-img {
        max-height: 300px;
    }
}

/* ========== Fishbone Timeline ========== */
.fishbone-timeline {
    position: relative;
    max-width: 900px;
    margin: 0 auto;
    padding: 40px 0;
}

.timeline-line {
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: linear-gradient(to bottom,
            var(--accent-pink) 0%,
            var(--secondary-blue) 50%,
            var(--primary-blue) 100%);
    transform: translateX(-50%);
    border-radius: 2px;
}

.fishbone-item {
    position: relative;
    display: flex;
    align-items: flex-start;
    margin-bottom: 40px;
    opacity: 0;
    transform: translateY(30px);
    animation: fishboneFadeIn 0.6s ease forwards;
}

.fishbone-item:nth-child(odd) {
    flex-direction: row;
    padding-right: 52%;
}

.fishbone-item:nth-child(even) {
    flex-direction: row-reverse;
    padding-left: 52%;
}

@keyframes fishboneFadeIn {
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.fishbone-item:nth-child(2) {
    animation-delay: 0.1s;
}

.fishbone-item:nth-child(3) {
    animation-delay: 0.2s;
}

.fishbone-item:nth-child(4) {
    animation-delay: 0.3s;
}

.fishbone-item:nth-child(5) {
    animation-delay: 0.4s;
}

.fishbone-item:nth-child(6) {
    animation-delay: 0.5s;
}

.fishbone-item:nth-child(7) {
    animation-delay: 0.6s;
}

.fishbone-item:nth-child(8) {
    animation-delay: 0.7s;
}

.fishbone-connector {
    position: absolute;
    top: 30px;
    height: 3px;
    width: calc(50% - 40px);
    background: linear-gradient(90deg, var(--secondary-blue), var(--accent-pink));
    z-index: 1;
}

.fishbone-item:nth-child(odd) .fishbone-connector {
    right: 50%;
    transform: translateX(40px);
}

.fishbone-item:nth-child(even) .fishbone-connector {
    left: 50%;
    transform: translateX(-40px);
}

.fishbone-node {
    position: absolute;
    left: 50%;
    top: 10px;
    transform: translateX(-50%);
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10;
    box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
    transition: all 0.4s ease;
}

/* Default: Upcoming (Blue) */
.fishbone-node {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border: 3px solid rgba(255, 255, 255, 0.3);
}

/* Current/Active (Pink) */
.fishbone-item.status-current .fishbone-node {
    background: linear-gradient(135deg, var(--accent-magenta), var(--accent-pink));
    border: 3px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 30px rgba(236, 72, 153, 0.6);
    animation: pulseGlow 2s ease-in-out infinite;
}

/* Past (Gray) */
.fishbone-item.status-past .fishbone-node {
    background: linear-gradient(135deg, #4a5568, #718096);
    border: 3px solid rgba(255, 255, 255, 0.2);
    opacity: 0.7;
}

/* Upcoming with countdown (Blue with glow) */
.fishbone-item.status-upcoming-soon .fishbone-node {
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    border: 3px solid rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 25px rgba(57, 73, 171, 0.6);
    animation: pulseBlue 2.5s ease-in-out infinite;
}

@keyframes pulseGlow {

    0%,
    100% {
        box-shadow: 0 0 30px rgba(236, 72, 153, 0.6);
    }

    50% {
        box-shadow: 0 0 50px rgba(236, 72, 153, 0.9);
    }
}

@keyframes pulseBlue {

    0%,
    100% {
        box-shadow: 0 0 25px rgba(57, 73, 171, 0.5);
    }

    50% {
        box-shadow: 0 0 40px rgba(57, 73, 171, 0.8);
    }
}

.node-icon {
    font-size: 1.5rem;
}

.fishbone-content {
    flex: 1;
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    padding: 20px 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    position: relative;
    z-index: 5;
}

.fishbone-item:nth-child(odd) .fishbone-content {
    text-align: right;
    margin-right: 20px;
}

.fishbone-item:nth-child(even) .fishbone-content {
    text-align: left;
    margin-left: 20px;
}

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

/* Current item content styling */
.fishbone-item.status-current .fishbone-content {
    border: 2px solid var(--accent-pink);
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.98), rgba(255, 240, 250, 0.98));
}

/* Past item content styling */
.fishbone-item.status-past .fishbone-content {
    opacity: 0.7;
    background: linear-gradient(135deg, rgba(240, 240, 240, 0.95), rgba(230, 230, 230, 0.95));
}

.fishbone-item.status-past .fishbone-content h3,
.fishbone-item.status-past .fishbone-content p {
    color: #718096;
}

.fishbone-header {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-bottom: 10px;
}

.fishbone-item:nth-child(odd) .fishbone-header {
    align-items: flex-end;
}

.fishbone-item:nth-child(even) .fishbone-header {
    align-items: flex-start;
}

.fishbone-header h3 {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-dark);
    margin: 0;
}

.fishbone-item.status-current .fishbone-header h3 {
    color: var(--accent-magenta);
}

.fishbone-date {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-blue), var(--secondary-blue));
    color: white;
    padding: 4px 12px;
    border-radius: var(--radius-full);
    font-size: 0.8rem;
    font-weight: 600;
}

.fishbone-item.status-current .fishbone-date {
    background: linear-gradient(135deg, var(--accent-magenta), var(--accent-pink));
}

.fishbone-item.status-past .fishbone-date {
    background: linear-gradient(135deg, #4a5568, #718096);
}

.fishbone-content p {
    font-size: 0.9rem;
    color: var(--text-muted);
    margin: 0;
}

.fishbone-countdown {
    margin-top: 10px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--accent-magenta);
    padding: 6px 12px;
    background: rgba(236, 72, 153, 0.1);
    border-radius: var(--radius-sm);
    display: none;
}

.fishbone-item.status-upcoming-soon .fishbone-countdown {
    display: inline-block;
}

/* Responsive Fishbone */
@media (max-width: 768px) {
    .timeline-line {
        left: 30px;
    }

    .fishbone-item,
    .fishbone-item:nth-child(odd),
    .fishbone-item:nth-child(even) {
        flex-direction: row;
        padding-left: 80px;
        padding-right: 0;
    }

    .fishbone-node {
        left: 30px;
        width: 50px;
        height: 50px;
    }

    .fishbone-connector {
        display: none;
    }

    .fishbone-content,
    .fishbone-item:nth-child(odd) .fishbone-content,
    .fishbone-item:nth-child(even) .fishbone-content {
        text-align: left;
        margin-left: 0;
        margin-right: 0;
    }

    .fishbone-header,
    .fishbone-item:nth-child(odd) .fishbone-header,
    .fishbone-item:nth-child(even) .fishbone-header {
        align-items: flex-start;
    }
}

/* ========== Registrants Banner ========== */
.registrants-banner {
    padding: 20px 0;
    background: linear-gradient(135deg,
            rgba(102, 126, 234, 0.9) 0%,
            rgba(118, 75, 162, 0.9) 50%,
            rgba(236, 72, 153, 0.9) 100%);
}

.registrants-banner .banner-link {
    display: block;
    text-decoration: none;
}

.registrants-banner .banner-content {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    padding: 20px 40px;
    transition: var(--transition);
}

.registrants-banner .banner-content:hover {
    background: rgba(255, 255, 255, 0.25);
    border-color: rgba(255, 255, 255, 0.5);
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

.registrants-banner .banner-icon {
    font-size: 2rem;
}

.registrants-banner .banner-text {
    font-size: 1.3rem;
    font-weight: 700;
    color: white;
    font-family: 'Sarabun', sans-serif;
}

.registrants-banner .banner-cta {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--accent-light-pink);
    background: rgba(255, 255, 255, 0.2);
    padding: 8px 20px;
    border-radius: var(--radius-full);
    transition: var(--transition);
}

.registrants-banner .banner-content:hover .banner-cta {
    background: rgba(255, 255, 255, 0.35);
    color: white;
}

@media (max-width: 768px) {
    .registrants-banner .banner-content {
        flex-direction: column;
        gap: 10px;
        padding: 15px 25px;
    }

    .registrants-banner .banner-text {
        font-size: 1.1rem;
    }
}