/* ========================================
   CSFL 2026 - Main Stylesheet
   ======================================== */

/* CSS Variables */
:root {
    --primary-blue: #1e3a8a;
    --secondary-blue: #3b82f6;
    --accent-green: #10b981;
    --warn-orange: #f59e0b;
    --dark-gray: #1f2937;
    --light-gray: #f3f4f6;
    --white: #ffffff;
    --text-dark: #111827;
    --text-light: #6b7280;

    --font-primary: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    --font-heading: 'Georgia', serif;

    --transition: all 0.3s ease;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    color: var(--text-dark);
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.5rem; }
h3 { font-size: 2rem; }
h4 { font-size: 1.5rem; }

p {
    margin-bottom: 1rem;
    color: var(--text-light);
}

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

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

/* Navigation */
.navbar {
    background: var(--white);
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
}

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

.nav-brand h1 {
    color: var(--primary-blue);
    font-size: 1.8rem;
    margin: 0;
}

.nav-brand .tagline {
    display: block;
    font-size: 0.9rem;
    color: var(--text-light);
    font-style: italic;
}

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

.nav-menu li a {
    color: var(--text-dark);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 4px;
    transition: var(--transition);
}

.nav-menu li a:hover {
    background: var(--light-gray);
    color: var(--primary-blue);
}

.hamburger {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--primary-blue);
    border-radius: 2px;
}

/* Hero Section */
.hero {
    position: relative;
    background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
    color: var(--white);
    padding: 8rem 0 6rem;
    overflow: hidden;
}

.hero-overlay {
    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 1200 600"><path d="M0,300 Q300,200 600,300 T1200,300 L1200,600 L0,600 Z" fill="rgba(255,255,255,0.05)"/></svg>') no-repeat bottom center;
    background-size: cover;
    opacity: 0.5;
}

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

.hero-title {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

.hero-subtitle {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: rgba(255,255,255,0.9);
}

.hero-description {
    font-size: 1.1rem;
    max-width: 800px;
    margin: 0 auto 2rem;
    color: rgba(255,255,255,0.85);
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    margin-bottom: 3rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.875rem 1.75rem;
    border-radius: 6px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

.btn-primary {
    background: var(--accent-green);
    color: var(--white);
}

.btn-primary:hover {
    background: #059669;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

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

/* Hero Stats */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    flex-wrap: wrap;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-green);
}

.stat-label {
    font-size: 0.9rem;
    color: rgba(255,255,255,0.8);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Section Styles */
section {
    padding: 5rem 0;
}

.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-header h2 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.section-header p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto;
}

/* About Section */
.about {
    background: var(--light-gray);
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.about-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

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

.card-icon {
    font-size: 3rem;
    color: var(--secondary-blue);
    margin-bottom: 1rem;
}

.about-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

/* Seminars Section */
.seminars-list {
    display: grid;
    gap: 2rem;
}

.seminar-card {
    background: var(--white);
    border-left: 4px solid var(--secondary-blue);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.seminar-card:hover {
    box-shadow: var(--shadow-lg);
    border-left-color: var(--accent-green);
}

.seminar-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1rem;
}

.seminar-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--secondary-blue);
}

.seminar-date {
    color: var(--text-light);
    font-weight: 500;
}

.seminar-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.75rem;
}

.seminar-description {
    color: var(--text-light);
    margin-bottom: 1rem;
}

.seminar-meta {
    display: flex;
    gap: 1.5rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    color: var(--text-light);
}

.seminar-meta span {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.seminar-meta i {
    color: var(--secondary-blue);
}

.seminar-link {
    display: inline-block;
    color: var(--secondary-blue);
    font-weight: 600;
    transition: var(--transition);
}

.seminar-link:hover {
    color: var(--accent-green);
    transform: translateX(5px);
}

/* Materials Section */
.materials {
    background: var(--light-gray);
}

.materials-info {
    margin-bottom: 3rem;
}

.info-box {
    background: #dbeafe;
    border-left: 4px solid var(--secondary-blue);
    padding: 1.5rem;
    border-radius: 6px;
    display: flex;
    align-items: start;
    gap: 1rem;
}

.info-box i {
    font-size: 1.5rem;
    color: var(--secondary-blue);
    flex-shrink: 0;
}

.materials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.material-type {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

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

.material-type i {
    font-size: 3rem;
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.material-type h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.materials-cta {
    background: var(--primary-blue);
    color: var(--white);
    padding: 3rem;
    border-radius: 8px;
    text-align: center;
}

.materials-cta h3 {
    color: var(--white);
    margin-bottom: 1rem;
}

.materials-cta p {
    color: rgba(255,255,255,0.9);
    margin-bottom: 2rem;
}

/* Registration Section */
.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.pricing-card {
    background: var(--white);
    border-radius: 8px;
    padding: 2rem;
    box-shadow: var(--shadow-md);
    text-align: center;
    position: relative;
    transition: var(--transition);
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border: 3px solid var(--accent-green);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--accent-green);
    color: var(--white);
    padding: 0.5rem 1.5rem;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-card h3 {
    color: var(--primary-blue);
    margin-top: 1rem;
}

.price {
    margin: 2rem 0;
}

.amount {
    display: block;
    font-size: 3rem;
    font-weight: 700;
    color: var(--primary-blue);
}

.period {
    display: block;
    color: var(--text-light);
    font-size: 0.9rem;
}

.features {
    list-style: none;
    margin-bottom: 2rem;
    text-align: left;
}

.features li {
    padding: 0.75rem 0;
    border-bottom: 1px solid var(--light-gray);
}

.features li i {
    color: var(--accent-green);
    margin-right: 0.5rem;
}

.registration-info {
    background: var(--light-gray);
    padding: 2rem;
    border-radius: 8px;
}

.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 1.5rem;
}

.info-item {
    display: flex;
    align-items: start;
    gap: 1rem;
}

.info-item i {
    font-size: 1.5rem;
    color: var(--secondary-blue);
    flex-shrink: 0;
}

/* Partners Section */
.partners {
    background: var(--light-gray);
}

.partners-grid {
    display: grid;
    gap: 3rem;
}

.partner-category h3 {
    color: var(--primary-blue);
    text-align: center;
    margin-bottom: 1.5rem;
}

.partner-logos {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 2rem;
}

.partner-logo {
    background: var(--white);
    padding: 1.5rem 2rem;
    border-radius: 6px;
    box-shadow: var(--shadow-sm);
    font-weight: 600;
    color: var(--text-dark);
    transition: var(--transition);
}

.partner-logo:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-3px);
}

/* Contacts Section */
.contacts-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 3rem;
}

.contact-card {
    background: var(--white);
    padding: 2rem;
    border-radius: 8px;
    box-shadow: var(--shadow-sm);
    text-align: center;
    transition: var(--transition);
}

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

.contact-card i {
    font-size: 3rem;
    color: var(--secondary-blue);
    margin-bottom: 1rem;
}

.contact-card h3 {
    color: var(--primary-blue);
    margin-bottom: 0.5rem;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 50px;
    height: 50px;
    background: var(--secondary-blue);
    color: var(--white);
    border-radius: 50%;
    font-size: 1.5rem;
    transition: var(--transition);
}

.social-links a:hover {
    background: var(--accent-green);
    transform: scale(1.1);
}

/* Footer */
.footer {
    background: var(--dark-gray);
    color: var(--white);
    padding: 3rem 0 1rem;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.footer-section h3,
.footer-section h4 {
    color: var(--accent-green);
    margin-bottom: 1rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 0.5rem;
}

.footer-section a {
    color: rgba(255,255,255,0.8);
}

.footer-section a:hover {
    color: var(--accent-green);
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    color: rgba(255,255,255,0.6);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .hero-title {
        font-size: 2.5rem;
    }

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

    .hero-buttons {
        flex-direction: column;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    h2 {
        font-size: 2rem;
    }

    .pricing-cards,
    .about-grid,
    .materials-grid {
        grid-template-columns: 1fr;
    }
}