:root {
    --primary-black: #000000;
    --primary-silver: #C0C0C0;
    --dark-silver: #808080;
    --light-silver: #E8E8E8;
    --white: #FFFFFF;
    --accent-gold: #FFD700;
    --text-primary: #000000;
    --text-secondary: #4A4A4A;
    --text-light: #666666;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --shadow-heavy: rgba(0, 0, 0, 0.25);
}

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

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

/* Header */
header {
    background: linear-gradient(135deg, var(--primary-black) 0%, var(--dark-silver) 100%);
    color: var(--white);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

header.scrolled {
    background: rgba(0, 0, 0, 0.95);
    box-shadow: 0 2px 20px var(--shadow-medium);
}

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

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

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    color: var(--primary-silver);
    text-decoration: none;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 2rem;
}

nav a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

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

nav a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-silver);
    transition: width 0.3s ease;
}

nav a:hover::after {
    width: 100%;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-black) 0%, var(--dark-silver) 100%);
    color: var(--white);
    padding: 120px 0 80px;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('images/hero-bg.jpg') center/cover;
    opacity: 0.15;
    z-index: 0;
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 4rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.1;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.5);
}

.hero .subtitle {
    font-size: 1.5rem;
    color: var(--primary-silver);
    margin-bottom: 1rem;
    font-weight: 300;
}

.hero .event-info {
    font-size: 1.2rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

.hero .highlights {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 1.5rem 2rem;
    border-radius: 15px;
    margin: 2rem auto;
    max-width: 800px;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.hero .highlights h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: var(--accent-gold);
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, var(--primary-silver) 0%, var(--white) 100%);
    color: var(--primary-black);
    padding: 18px 40px;
    text-decoration: none;
    font-size: 1.2rem;
    font-weight: 700;
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: 0 8px 25px rgba(192, 192, 192, 0.3);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-top: 2rem;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 35px rgba(192, 192, 192, 0.4);
    background: linear-gradient(135deg, var(--white) 0%, var(--primary-silver) 100%);
}

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

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 3rem;
    color: var(--primary-black);
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-black), var(--primary-silver));
    border-radius: 2px;
}

/* Benefits Grid */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.benefit-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-light);
    transition: all 0.3s ease;
    border: 1px solid var(--light-silver);
    position: relative;
    overflow: hidden;
}

.benefit-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-black), var(--primary-silver));
}

.benefit-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px var(--shadow-medium);
}

.benefit-card h3 {
    font-size: 1.5rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--primary-black);
}

.benefit-card p {
    color: var(--text-light);
    line-height: 1.7;
}

/* Speakers Section */
.speakers {
    background: linear-gradient(135deg, var(--light-silver) 0%, var(--white) 100%);
}

.speakers-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.speaker-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    box-shadow: 0 10px 30px var(--shadow-light);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.speaker-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-silver);
    box-shadow: 0 15px 35px var(--shadow-medium);
}

.speaker-image {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    border: 4px solid var(--primary-silver);
    overflow: hidden;
}

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

/* Program Schedule */
.program-grid {
    display: grid;
    gap: 1.5rem;
    margin-top: 3rem;
}

.program-item {
    background: var(--white);
    padding: 2rem;
    border-radius: 15px;
    box-shadow: 0 5px 20px var(--shadow-light);
    border-left: 5px solid var(--primary-silver);
    transition: all 0.3s ease;
}

.program-item:hover {
    transform: translateX(10px);
    box-shadow: 0 8px 25px var(--shadow-medium);
}

.program-time {
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 0.5rem;
}

.program-item h3 {
    font-size: 1.3rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

/* Registration Section */
.registration {
    background: linear-gradient(135deg, var(--primary-black) 0%, var(--dark-silver) 100%);
    color: var(--white);
}

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

.registration .section-title::after {
    background: linear-gradient(90deg, var(--primary-silver), var(--white));
}

.pricing-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 3rem;
    border-radius: 20px;
    text-align: center;
    max-width: 500px;
    margin: 0 auto;
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.price {
    font-size: 3rem;
    font-weight: 800;
    color: var(--accent-gold);
    margin: 1rem 0;
}

.price-details {
    opacity: 0.9;
    margin-bottom: 2rem;
}

.urgency {
    background: rgba(255, 215, 0, 0.2);
    padding: 1rem;
    border-radius: 10px;
    margin-top: 2rem;
    border: 1px solid var(--accent-gold);
}

/* Footer */
footer {
    background: var(--primary-black);
    color: var(--primary-silver);
    padding: 2rem 0;
    text-align: center;
}

/* Mobile Responsiveness */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .hero .subtitle {
        font-size: 1.2rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .benefits-grid,
    .speakers-grid {
        grid-template-columns: 1fr;
    }
    
    nav ul {
        flex-direction: column;
        gap: 1rem;
    }
    
    .header-content {
        flex-direction: column;
        gap: 1rem;
    }
    
    .cta-button {
        padding: 15px 30px;
        font-size: 1rem;
    }
}

/* Performance Optimizations */
.lazy-load {
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lazy-load.loaded {
    opacity: 1;
}

/* Accessibility */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Focus styles for keyboard navigation */
a:focus,
button:focus {
    outline: 2px solid var(--primary-silver);
    outline-offset: 2px;
}


/* Become a Speaker Section */
.become-speaker {
    background: linear-gradient(135deg, var(--white) 0%, var(--light-silver) 100%);
    position: relative;
}

.become-speaker::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1000 100" fill="%23C0C0C0" opacity="0.1"><polygon points="0,0 1000,0 1000,100 0,80"/></svg>') no-repeat center top;
    background-size: cover;
    z-index: 0;
}

.speaker-cta-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
    position: relative;
    z-index: 1;
}

.speaker-info h3 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 1.5rem;
}

.speaker-info p {
    font-size: 1.1rem;
    color: var(--text-light);
    line-height: 1.7;
    margin-bottom: 2rem;
}

.speaker-benefits {
    display: grid;
    gap: 1rem;
}

.benefit-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: var(--white);
    border-radius: 10px;
    box-shadow: 0 2px 10px var(--shadow-light);
    transition: all 0.3s ease;
}

.benefit-item:hover {
    transform: translateX(5px);
    box-shadow: 0 4px 15px var(--shadow-medium);
}

.benefit-icon {
    font-size: 1.5rem;
    min-width: 40px;
    text-align: center;
}

.speaker-contact {
    position: sticky;
    top: 100px;
}

.contact-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    box-shadow: 0 10px 30px var(--shadow-medium);
    border: 2px solid var(--primary-silver);
    position: relative;
    overflow: hidden;
}

.contact-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-black), var(--primary-silver));
}

.contact-card h4 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-black);
    margin-bottom: 1rem;
    text-align: center;
}

.contact-card > p {
    color: var(--text-light);
    text-align: center;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.contact-methods {
    display: grid;
    gap: 1rem;
    margin-bottom: 2rem;
}

.contact-button {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.8rem;
    padding: 1rem 1.5rem;
    border-radius: 12px;
    text-decoration: none;
    font-weight: 600;
    font-size: 1rem;
    transition: all 0.3s ease;
    border: 2px solid transparent;
}

.email-btn {
    background: linear-gradient(135deg, var(--primary-black) 0%, var(--dark-silver) 100%);
    color: var(--white);
}

.email-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.3);
    background: linear-gradient(135deg, var(--dark-silver) 0%, var(--primary-black) 100%);
}

.whatsapp-btn {
    background: linear-gradient(135deg, #25D366 0%, #128C7E 100%);
    color: var(--white);
}

.whatsapp-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(37, 211, 102, 0.4);
    background: linear-gradient(135deg, #128C7E 0%, #25D366 100%);
}

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

.contact-info {
    background: var(--light-silver);
    padding: 1.5rem;
    border-radius: 12px;
    margin-top: 1.5rem;
}

.contact-info p {
    font-weight: 600;
    color: var(--primary-black);
    margin-bottom: 0.8rem;
}

.contact-info ul {
    list-style: none;
    padding: 0;
}

.contact-info li {
    color: var(--text-light);
    padding: 0.3rem 0;
    position: relative;
    padding-left: 1.5rem;
}

.contact-info li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: #25D366;
    font-weight: bold;
}

/* Mobile Responsiveness for Speaker Section */
@media (max-width: 768px) {
    .speaker-cta-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .speaker-contact {
        position: static;
    }
    
    .contact-card {
        padding: 2rem;
    }
    
    .speaker-info h3 {
        font-size: 1.5rem;
    }
    
    .benefit-item {
        padding: 0.8rem;
    }
    
    .contact-button {
        padding: 0.8rem 1.2rem;
        font-size: 0.9rem;
    }
}