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

:root {
    /* Colors */
    --primary-color: #E31E24;
    --primary-dark: #C41E24;
    --primary-light: #FF3B42;
    --secondary-color: #1E88E5;
    --success-color: #4CAF50;
    --error-color: #F44336;
    --warning-color: #FF9800;
    
    --text-primary: #1A1A1A;
    --text-secondary: #666666;
    --text-light: #999999;
    --text-white: #FFFFFF;
    
    --bg-primary: #FFFFFF;
    --bg-secondary: #F8F9FA;
    --bg-dark: #1A1A1A;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    --border-color: #E0E0E0;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    
    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;
    --font-size-4xl: 2.5rem;
    --font-size-5xl: 3rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-2xl: 4rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Transitions */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

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

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

/* ===================================
   Header
   =================================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    z-index: 1000;
    transition: var(--transition-base);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--primary-color);
}

.logo i {
    font-size: var(--font-size-2xl);
}

.nav {
    display: flex;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: var(--transition-base);
}

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

.nav-link:hover::after {
    width: 100%;
}

/* ===================================
   Buttons
   =================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-xs);
    padding: 0.75rem 1.5rem;
    font-size: var(--font-size-base);
    font-weight: 600;
    text-decoration: none;
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

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

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

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--text-white);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: var(--font-size-lg);
}

.btn-submit {
    width: 100%;
    margin-top: var(--spacing-md);
}

.btn-loader {
    display: none;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-top-color: var(--text-white);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

.btn-submit.loading .btn-loader {
    display: block;
}

.btn-submit.loading span {
    display: none;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ===================================
   Hero Section
   =================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-background {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    z-index: -2;
}

.hero-background::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg width="100" height="100" xmlns="http://www.w3.org/2000/svg"><defs><pattern id="grid" width="100" height="100" patternUnits="userSpaceOnUse"><path d="M 100 0 L 0 0 0 100" fill="none" stroke="rgba(255,255,255,0.1)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.3);
    z-index: -1;
}

.hero-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

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

.hero-title {
    font-size: var(--font-size-5xl);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
}

.highlight {
    background: linear-gradient(120deg, #FFD700 0%, #FFA500 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: var(--font-size-lg);
    margin-bottom: var(--spacing-xl);
    opacity: 0.95;
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
}

.stat-item {
    text-align: center;
}

.stat-number {
    font-size: var(--font-size-3xl);
    font-weight: 700;
    color: #FFD700;
}

.stat-label {
    font-size: var(--font-size-sm);
    opacity: 0.9;
}

.hero-image {
    position: relative;
    display: flex;
    justify-content: center;
    align-items: center;
}

.floating-card {
    background: rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    text-align: center;
    animation: float 3s ease-in-out infinite;
}

.floating-card i {
    font-size: 5rem;
    color: #FFD700;
    margin-bottom: var(--spacing-md);
}

.card-text {
    font-size: var(--font-size-xl);
    font-weight: 600;
    color: var(--text-white);
}

@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

/* ===================================
   Section Styles
   =================================== */
section {
    padding: var(--spacing-2xl) 0;
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-2xl);
}

.section-title {
    font-size: var(--font-size-4xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-description {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

/* ===================================
   Packages Section
   =================================== */
.packages {
    background: var(--bg-secondary);
}

.packages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
}

.package-card {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    transition: var(--transition-base);
    position: relative;
    overflow: hidden;
}

.package-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transform: scaleX(0);
    transition: var(--transition-base);
}

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

.package-card:hover::before {
    transform: scaleX(1);
}

.package-card.featured {
    border: 2px solid var(--primary-color);
    transform: scale(1.05);
}

.package-badge {
    display: inline-block;
    padding: 0.5rem 1rem;
    background: var(--primary-color);
    color: var(--text-white);
    border-radius: var(--radius-full);
    font-size: var(--font-size-sm);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

.package-badge.best {
    background: linear-gradient(135deg, #FFD700, #FFA500);
}

.package-header {
    margin-bottom: var(--spacing-lg);
}

.package-name {
    font-size: var(--font-size-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
}

.package-price {
    display: flex;
    align-items: baseline;
    gap: var(--spacing-xs);
}

.price-amount {
    font-size: var(--font-size-4xl);
    font-weight: 800;
    color: var(--primary-color);
}

.price-unit {
    font-size: var(--font-size-lg);
    color: var(--text-secondary);
}

.package-discount {
    color: var(--success-color);
    font-weight: 600;
    margin-top: var(--spacing-xs);
}

.package-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

.package-features li {
    padding: var(--spacing-xs) 0;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.package-features i {
    color: var(--success-color);
    font-size: var(--font-size-lg);
}

/* ===================================
   Benefits Section
   =================================== */
.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

.benefit-card {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-sm);
    transition: var(--transition-base);
}

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

.benefit-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-md);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-size-3xl);
    color: var(--text-white);
}

.benefit-title {
    font-size: var(--font-size-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
}

.benefit-description {
    color: var(--text-secondary);
    line-height: 1.6;
}

/* ===================================
   Registration Form
   =================================== */
.registration {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
}

.registration-wrapper {
    max-width: 700px;
    margin: 0 auto;
}

.registration-content {
    background: var(--bg-primary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
}

.alert {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-weight: 500;
}

.alert-success {
    background: #E8F5E9;
    color: var(--success-color);
    border: 1px solid var(--success-color);
}

.alert-error {
    background: #FFEBEE;
    color: var(--error-color);
    border: 1px solid var(--error-color);
}

.registration-form {
    margin-top: var(--spacing-lg);
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

.required {
    color: var(--error-color);
}

.input-wrapper {
    position: relative;
}

.input-icon {
    position: absolute;
    left: var(--spacing-md);
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-secondary);
    z-index: 1;
}

.form-input {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 3rem;
    font-size: var(--font-size-base);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    transition: var(--transition-base);
    font-family: var(--font-family);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(227, 30, 36, 0.1);
}

.form-input::placeholder {
    color: var(--text-light);
}

textarea.form-input {
    padding-top: var(--spacing-md);
    resize: vertical;
    min-height: 100px;
}

select.form-input {
    cursor: pointer;
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%23666' d='M6 9L1 4h10z'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right var(--spacing-md) center;
    padding-right: 3rem;
}

.form-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: var(--font-size-sm);
    color: var(--text-light);
}

.checkbox-group {
    margin-top: var(--spacing-lg);
}

.checkbox-label {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-sm);
    cursor: pointer;
    font-size: var(--font-size-sm);
}

.checkbox-label input[type="checkbox"] {
    margin-top: 0.25rem;
    cursor: pointer;
}

.link {
    color: var(--primary-color);
    text-decoration: none;
}

.link:hover {
    text-decoration: underline;
}

/* ===================================
   Footer
   =================================== */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--spacing-2xl) 0 var(--spacing-lg);
}

.footer-content {
    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: var(--spacing-xs);
    font-size: var(--font-size-xl);
    font-weight: 700;
    margin-bottom: var(--spacing-md);
}

.footer-logo i {
    font-size: var(--font-size-2xl);
}

.footer-description {
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.social-links {
    display: flex;
    gap: var(--spacing-sm);
}

.social-link {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-full);
    color: var(--text-white);
    text-decoration: none;
    transition: var(--transition-base);
}

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

.footer-title {
    font-size: var(--font-size-lg);
    font-weight: 600;
    margin-bottom: var(--spacing-md);
}

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

.footer-links li {
    margin-bottom: var(--spacing-sm);
    color: rgba(255, 255, 255, 0.8);
}

.footer-links li i {
    margin-right: var(--spacing-xs);
    color: var(--primary-color);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-white);
    padding-left: var(--spacing-xs);
}

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

/* ===================================
   Scroll to Top Button
   =================================== */
.scroll-top {
    position: fixed;
    bottom: var(--spacing-lg);
    right: var(--spacing-lg);
    width: 50px;
    height: 50px;
    background: var(--primary-color);
    color: var(--text-white);
    border: none;
    border-radius: var(--radius-full);
    cursor: pointer;
    display: none;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-base);
    z-index: 999;
}

.scroll-top:hover {
    background: var(--primary-dark);
    transform: translateY(-5px);
}

.scroll-top.visible {
    display: flex;
}

/* ===================================
   Responsive Design
   =================================== */
@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .nav {
        display: none;
    }
    
    .hero-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: var(--font-size-3xl);
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .packages-grid {
        grid-template-columns: 1fr;
    }
    
    .package-card.featured {
        transform: scale(1);
    }
    
    .benefits-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: var(--font-size-3xl);
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 var(--spacing-sm);
    }
    
    .hero-title {
        font-size: var(--font-size-2xl);
    }
    
    .registration-content {
        padding: var(--spacing-lg);
    }
}