/* ===== CSS RESET & BASE STYLES ===== */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Color Palette */
    --deep-blue: #0f143a;
    --royal-blue: #204dcc;
    --orange: rgb(240, 127, 36);
    --white: #ffffff;
    --light-gray: #f8f9fa;
    --medium-gray: #e9ecef;
    --dark-gray: #6c757d;
    --text-dark: #212529;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Typography */
    --font-primary: 'Inter', sans-serif;
    --font-secondary: 'Poppins', sans-serif;
    
    /* Effects */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 8px 30px rgba(0, 0, 50, 0.12);
    --shadow-lg: 0 15px 50px rgba(0, 0, 50, 0.15);
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
    scroll-behavior: smooth;
}

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

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* ===== TYPOGRAPHY ===== */
h1, h2, h3, h4 {
    font-family: var(--font-secondary);
    font-weight: 600;
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.5rem; }
h4 { font-size: 1.25rem; }

@media (min-width: 768px) {
    h1 { font-size: 3.5rem; }
    h2 { font-size: 2.5rem; }
    h3 { font-size: 1.75rem; }
}

p {
    margin-bottom: var(--spacing-sm);
}

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

/* ===== BUTTONS ===== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border-radius: var(--radius-md);
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-size: 1rem;
}

.btn-primary {
    background: linear-gradient(135deg, var(--royal-blue), #1a3db0);
    color: var(--white);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    background: linear-gradient(135deg, #1a3db0, var(--royal-blue));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-outline {
    background: transparent;
    color: var(--royal-blue);
    border: 2px solid var(--royal-blue);
}

.btn-outline:hover {
    background: var(--royal-blue);
    color: var(--white);
}

.btn-lg {
    padding: 1rem 2rem;
    font-size: 1.1rem;
}

/* ===== HEADER & NAVIGATION ===== */
.main-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
}

.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    text-decoration: none;
    color: var(--deep-blue);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--royal-blue), var(--deep-blue));
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-weight: 700;
    font-size: 1.2rem;
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.logo-title {
    font-family: var(--font-secondary);
    font-weight: 700;
    font-size: 1.2rem;
    color: var(--deep-blue);
}

.logo-subtitle {
    font-size: 0.8rem;
    color: var(--dark-gray);
}

.nav-menu {
    display: flex;
    gap: 2rem;
    align-items: center;
}

.nav-link {
    color: var(--deep-blue);
    font-weight: 500;
    padding: 0.5rem 0;
    position: relative;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link:hover {
    color: var(--royal-blue);
}

.nav-link.active {
    color: var(--royal-blue);
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--royal-blue);
    border-radius: 1px;
}

.cta-nav {
    background: linear-gradient(135deg, var(--orange), #e06a1a);
    color: var(--white) !important;
    padding: 0.5rem 1.5rem;
    border-radius: var(--radius-md);
    margin-left: 1rem;
}

.cta-nav:hover {
    background: linear-gradient(135deg, #e06a1a, var(--orange));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.admin-nav {
    background: var(--deep-blue);
    color: var(--white) !important;
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
}

.mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-btn .bar {
    display: block;
    width: 25px;
    height: 3px;
    background: var(--deep-blue);
    margin: 5px 0;
    border-radius: 2px;
    transition: var(--transition);
}

/* ===== HERO SECTION ===== */
.hero-section {
    margin-top: 80px;
    position: relative;
    height: 80vh;
    min-height: 600px;
    overflow: hidden;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

.hero-slider {
    position: relative;
    height: 100%;
}

.slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-size: cover;
    background-position: center;
    opacity: 0;
    transition: opacity 1s ease;
    display: flex;
    align-items: center;
}

.slide.active {
    opacity: 1;
}

.slide-content {
    max-width: 600px;
    color: var(--white);
}

.slide-subtitle {
    display: inline-block;
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
    letter-spacing: 1px;
}

.slide-title {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    color: var(--white);
}

.slide-text {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.cta-button {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    background: linear-gradient(135deg, var(--orange), #e06a1a);
    color: var(--white);
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    font-weight: 600;
    font-size: 1.1rem;
    transition: var(--transition);
    box-shadow: var(--shadow-md);
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
    color: var(--white);
}

.cta-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.25rem;
}

.slider-controls {
    position: absolute;
    bottom: 2rem;
    left: 0;
    width: 100%;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 2rem;
}

.slider-prev,
.slider-next {
    background: rgba(255, 255, 255, 0.2);
    backdrop-filter: blur(10px);
    border: none;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    color: var(--white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.slider-prev:hover,
.slider-next:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.slider-dots {
    display: flex;
    gap: 0.75rem;
}

.dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    cursor: pointer;
    transition: var(--transition);
}

.dot.active {
    background: var(--white);
    transform: scale(1.2);
}

/* ===== ABOUT SECTION ===== */
.about-section {
    padding: var(--spacing-xl) 0;
}

.section-header {
    text-align: center;
    max-width: 600px;
    margin: 0 auto var(--spacing-xl);
}

.section-subtitle {
    display: inline-block;
    color: var(--royal-blue);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.section-title {
    color: var(--deep-blue);
    margin-bottom: var(--spacing-sm);
}

.section-description {
    color: var(--dark-gray);
    font-size: 1.1rem;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xl);
}

.about-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: var(--transition);
    text-align: center;
}

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

.about-icon {
    width: 70px;
    height: 70px;
    background: linear-gradient(135deg, var(--royal-blue), var(--deep-blue));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-md);
    color: var(--white);
    font-size: 1.5rem;
}

.about-card h3 {
    color: var(--deep-blue);
    margin-bottom: var(--spacing-xs);
}

.about-detail {
    color: var(--dark-gray);
    font-size: 0.9rem;
}

/* ===== CTA SECTION ===== */
.cta-section {
    padding: var(--spacing-xl) 0;
    background: linear-gradient(135deg, var(--deep-blue), #1a1f4d);
    color: var(--white);
    margin: var(--spacing-xl) 0;
    border-radius: var(--radius-lg);
}

.cta-content {
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.cta-content h2 {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
}

.cta-content p {
    font-size: 1.2rem;
    opacity: 0.9;
    margin-bottom: var(--spacing-lg);
}

/* ===== REGISTER PAGE ===== */
.register-page {
    padding: 100px 0 var(--spacing-xl);
    background: var(--light-gray);
    min-height: 100vh;
}

.page-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    color: var(--deep-blue);
    margin-bottom: var(--spacing-sm);
}

.page-header p {
    color: var(--dark-gray);
    max-width: 600px;
    margin: 0 auto;
}

.register-form-container {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: var(--spacing-lg);
}

@media (max-width: 992px) {
    .register-form-container {
        grid-template-columns: 1fr;
    }
}

.register-form {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
}

.form-section {
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid var(--medium-gray);
}

.form-section:last-child {
    border-bottom: none;
}

.form-section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--deep-blue);
    margin-bottom: var(--spacing-lg);
}

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: var(--spacing-md);
}

@media (max-width: 768px) {
    .form-grid {
        grid-template-columns: 1fr;
    }
}

.form-group {
    margin-bottom: var(--spacing-md);
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--deep-blue);
}

.form-group label::after {
    content: ' *';
    color: var(--orange);
    opacity: 0.7;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 2px solid var(--medium-gray);
    border-radius: var(--radius-md);
    font-family: var(--font-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--royal-blue);
    box-shadow: 0 0 0 3px rgba(32, 77, 204, 0.1);
}

.form-error {
    color: #dc3545;
    font-size: 0.875rem;
    margin-top: 0.25rem;
    display: none;
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.form-footer {
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-md);
    border-top: 1px solid var(--medium-gray);
    color: var(--dark-gray);
    font-size: 0.9rem;
}

/* Sidebar */
.form-sidebar {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.sidebar-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border-top: 4px solid var(--royal-blue);
}

.sidebar-card h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--deep-blue);
    margin-bottom: var(--spacing-md);
}

.event-details {
    list-style: none;
}

.event-details li {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: var(--spacing-sm);
}

.event-details i {
    color: var(--royal-blue);
    margin-top: 0.2rem;
}

/* Success Message */
.success-message {
    background: var(--white);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.success-icon {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, #28a745, #218838);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-lg);
    color: var(--white);
    font-size: 2.5rem;
}

.success-message h2 {
    color: var(--deep-blue);
    margin-bottom: var(--spacing-md);
}

.success-actions {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-top: var(--spacing-xl);
}

/* Error Message */
.error-message {
    background: #f8d7da;
    color: #721c24;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.error-message i {
    font-size: 1.2rem;
}

/* ===== FOOTER ===== */
.main-footer {
    background: var(--deep-blue);
    color: var(--white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: var(--spacing-md);
}

.footer-logo .logo-icon {
    background: linear-gradient(135deg, var(--orange), #e06a1a);
}

.footer-logo-text h3 {
    color: var(--white);
    margin-bottom: 0.25rem;
}

.footer-logo-text p {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-md);
}

.social-links {
    display: flex;
    gap: 1rem;
}

.social-link {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: var(--transition);
}

.social-link:hover {
    background: var(--royal-blue);
    transform: translateY(-3px);
}

.footer-title {
    color: var(--white);
    margin-bottom: var(--spacing-md);
    font-size: 1.2rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: 0.75rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--white);
    padding-left: 0.5rem;
}

.contact-info p {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    margin-bottom: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

.contact-info i {
    color: var(--orange);
    margin-top: 0.2rem;
}

.newsletter-form {
    margin-top: var(--spacing-md);
}

.input-group {
    display: flex;
    gap: 0;
}

.input-group input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    font-family: var(--font-primary);
}

.newsletter-btn {
    background: var(--orange);
    color: var(--white);
    border: none;
    padding: 0.75rem 1.25rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
    cursor: pointer;
    transition: var(--transition);
}

.newsletter-btn:hover {
    background: #e06a1a;
}

.footer-bottom {
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.6);
    margin: 0;
}

.footer-bottom-links {
    display: flex;
    gap: var(--spacing-lg);
}

.footer-bottom-links a {
    color: rgba(255, 255, 255, 0.6);
    font-size: 0.9rem;
}

.footer-bottom-links a:hover {
    color: var(--white);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .mobile-menu-btn {
        display: block;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: 0;
        width: 100%;
        background: var(--white);
        flex-direction: column;
        padding: var(--spacing-lg);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition);
        z-index: 999;
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .hero-section {
        margin-top: 70px;
        height: 70vh;
        min-height: 500px;
    }
    
    .slide-title {
        font-size: 2rem;
    }
    
    .form-actions {
        flex-direction: column;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-bottom-links {
        justify-content: center;
    }
}

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

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