:root {
    --emerald-50: #ecfdf5;
    --emerald-100: #d1fae5;
    --emerald-500: #10b981;
    --emerald-600: #059669;
    --emerald-700: #047857;
    --slate-50: #f8fafc;
    --slate-100: #f1f5f9;
    --slate-800: #1e293b;
    --slate-900: #0f172a;
    --text-main: #334155;
    --text-muted: #64748b;
    --white: #ffffff;
    --radius-md: 8px;
    --radius-lg: 16px;
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 20px rgba(16, 185, 129, 0.4);
    --glass-bg: rgba(255, 255, 255, 0.85);
    --glass-border: 1px solid rgba(255, 255, 255, 0.3);
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    background-color: var(--slate-50);
    line-height: 1.6;
    scroll-behavior: smooth;
}

h1, h2, h3, h4 {
    color: var(--slate-900);
    line-height: 1.2;
    font-weight: 700;
}

a {
    text-decoration: none;
    color: inherit;
    transition: all 0.2s ease;
}

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

.text-center { text-align: center; }
.mt-xl { margin-top: 3rem; }
.bg-light { background-color: var(--white); }
.bg-emerald-light { background-color: var(--emerald-50); }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    border-radius: 50px;
    font-weight: 600;
    cursor: pointer;
    border: none;
    transition: all 0.3s ease;
}

.btn-primary {
    background-color: var(--emerald-600);
    color: var(--white);
}

.btn-primary:hover {
    background-color: var(--emerald-700);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
}

.btn-block {
    width: 100%;
}

.shadow-glow {
    box-shadow: var(--shadow-glow);
}

.shadow-glow:hover {
    box-shadow: 0 0 25px rgba(16, 185, 129, 0.6);
}

/* Cards & Containers */
.card {
    background-color: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    padding: 24px;
    border: 1px solid var(--slate-100);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.glass {
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: var(--glass-border);
}

.p-large {
    padding: 40px;
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    transition: all 0.3s ease;
    padding: 20px 0;
}

.navbar.scrolled {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(0,0,0,0.05);
    padding: 15px 0;
    box-shadow: var(--shadow-sm);
}

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

.logo {
    display: flex;
    align-items: center;
}
.header-logo {
    height: 32px;
    width: auto;
}

.nav-links {
    display: flex;
    gap: 32px;
}

.nav-links a {
    color: var(--slate-800);
    font-weight: 500;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--emerald-600);
}

/* Hero Section */
.hero {
    padding-top: 140px;
    padding-bottom: 80px;
    background: linear-gradient(135deg, var(--white) 0%, var(--emerald-50) 100%);
    overflow: hidden;
}

.hero-container {
    max-width: 900px;
    margin: 0 auto;
}

.mb-large {
    margin-bottom: 40px;
    text-align: center;
}

.badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--emerald-100);
    color: var(--emerald-700);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
    margin-bottom: 24px;
}

.hero h1 {
    font-size: 3.5rem;
    font-weight: 800;
    letter-spacing: -1px;
    margin-bottom: 16px;
    color: var(--slate-900);
}

.hero .subtitle {
    font-size: 1.5rem;
    color: var(--emerald-600);
    font-weight: 600;
    margin-bottom: 32px;
}

.hero-meta {
    display: flex;
    gap: 32px;
    margin-bottom: 32px;
    padding: 20px;
    background: var(--white);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--emerald-100);
}

.meta-item {
    display: flex;
    align-items: center;
    gap: 12px;
}

.meta-item .icon { font-size: 1.5rem; }
.meta-label { 
    display: block; 
    font-size: 0.8rem; 
    color: var(--text-muted); 
    text-transform: uppercase;
    font-weight: 600;
}
.meta-item strong { color: var(--slate-900); font-size: 1rem; }

.benefits {
    margin-bottom: 40px;
}

.benefits p {
    font-size: 1.125rem;
    margin-bottom: 16px;
    color: var(--slate-800);
}

.benefits ul {
    list-style: none;
}

.benefits li {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    margin-bottom: 12px;
    font-size: 1.05rem;
}

.check {
    color: var(--emerald-500);
    font-weight: bold;
}

.banner-img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 4px solid var(--white);
    transition: transform 0.3s ease;
}

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

/* Sections */
.section {
    padding: 80px 0;
}

.section-title {
    font-size: 2.5rem;
    margin-bottom: 48px;
    position: relative;
}
.section-title.text-center::after {
    content: '';
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background-color: var(--emerald-500);
    border-radius: 2px;
}

.format-content p {
    font-size: 1.125rem;
    margin-bottom: 24px;
}
.format-content p:last-child { margin-bottom: 0; }

/* Timeline */
.timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
    padding-left: 20px;
    padding-right: 20px;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 60px;
    top: 0;
    height: 100%;
    width: 2px;
    background-color: var(--emerald-100);
}

.timeline-item {
    display: flex;
    margin-bottom: 32px;
    position: relative;
    z-index: 1;
}

.time-marker {
    width: 80px;
    height: 80px;
    background-color: var(--emerald-500);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 1.25rem;
    border: 6px solid #f2f7f5;
    flex-shrink: 0;
}

.timeline-content {
    margin-left: 32px;
    flex-grow: 1;
}

.timeline-content h3 {
    color: var(--emerald-700);
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.speaker-tag {
    display: inline-block;
    font-size: 0.85rem;
    background: var(--emerald-50);
    color: var(--emerald-700);
    padding: 4px 12px;
    border-radius: 20px;
    font-weight: 600;
    margin-bottom: 16px;
    border: 1px solid var(--emerald-100);
}

.timeline-content ul {
    padding-left: 20px;
    color: var(--slate-800);
}

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

/* Details Grid */
.details-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.details-full {
    grid-column: 1 / -1;
}

.card-title {
    font-size: 1.5rem;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    color: var(--emerald-700);
}

.detail-list {
    list-style: none;
}
.detail-list li {
    margin-bottom: 12px;
    font-size: 1.1rem;
}
.detail-list strong { color: var(--slate-900); }

.speaker-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
    margin-top: 16px;
}

.speaker {
    display: flex;
    align-items: center;
    gap: 16px;
}

.speaker-avatar {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background-color: var(--emerald-100);
    color: var(--emerald-700);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
}

.speaker h4 { font-size: 1.125rem; margin-bottom: 4px; color: var(--slate-900); }
.speaker p { font-size: 0.9rem; color: var(--text-muted); }

/* Registration */
.registration-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}

.registration-info h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
    color: var(--slate-900);
}

.registration-info p {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 32px;
}

.limit-box {
    background-color: var(--emerald-50);
    border: 1px solid var(--emerald-100);
    padding: 24px;
    border-radius: var(--radius-md);
    border-left: 4px solid var(--emerald-500);
}

.limit-box strong {
    display: block;
    color: var(--emerald-700);
    font-size: 1.25rem;
    margin-bottom: 8px;
}

.limit-box p {
    font-size: 1rem;
    margin-bottom: 0;
}

.form-group {
    margin-bottom: 24px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 600;
    color: var(--slate-800);
    font-size: 0.95rem;
}

.form-group label span {
    color: #ef4444;
}

.form-group input, 
.form-group select {
    width: 100%;
    padding: 14px 16px;
    border: 1px solid #cbd5e1;
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: 1rem;
    transition: all 0.2s;
    background-color: #f8fafc;
}

.form-group input:focus, 
.form-group select:focus {
    outline: none;
    border-color: var(--emerald-500);
    background-color: var(--white);
    box-shadow: 0 0 0 3px var(--emerald-100);
}

.select-wrapper {
    position: relative;
}

.select-wrapper::after {
    content: "▼";
    font-size: 0.8rem;
    position: absolute;
    right: 16px;
    top: 50%;
    transform: translateY(-50%);
    pointer-events: none;
    color: var(--text-muted);
}

.form-group select {
    appearance: none;
}

.checkbox-group {
    display: flex;
    align-items: flex-start;
    gap: 12px;
}

.checkbox-group input {
    width: auto;
    margin-top: 4px;
}

.checkbox-group label {
    margin-bottom: 0;
    font-weight: 400;
    font-size: 0.9rem;
    color: var(--text-muted);
}

.hidden { display: none; }
.form-message {
    margin-top: 16px;
    padding: 12px;
    background-color: var(--emerald-100);
    color: var(--emerald-700);
    border-radius: var(--radius-md);
    text-align: center;
    font-weight: 600;
}

/* Footer */
.footer {
    padding: 40px 0;
    background-color: var(--slate-900);
    color: var(--slate-50);
}

/* Responsive */
@media (max-width: 992px) {
    .hero-container, .registration-container {
        grid-template-columns: 1fr;
    }
    .hero h1 { font-size: 2.5rem; }
    .hero { text-align: center; padding-top: 120px; }
    .hero-meta { flex-direction: column; gap: 16px; align-items: flex-start; }
    .nav-links { display: none; }
    .timeline::before { left: 50px; }
}

@media (max-width: 768px) {
    .details-grid { grid-template-columns: 1fr; }
    .speaker-grid { grid-template-columns: 1fr; }
    .timeline-item { flex-direction: column; }
    .timeline-content { margin-left: 20px; margin-top: 16px;}
    .timeline::before { left: 40px; }
    .time-marker { width: 60px; height: 60px; font-size: 1rem; margin-left:10px; }
}