/* =============================================
   CSS Variables & Design System
   ============================================= */
:root {
    /* Colors */
    --color-primary: #ff0000;
    --color-primary-dark: #cc0000;
    --color-secondary: #140000;
    --color-secondary-light: #2a0000;
    --color-white: #ffffff;
    --color-black: #000000;
    --color-gray-light: #f5f5f5;
    --color-gray: #666666;
    --color-gray-dark: #333333;
    
    /* Typography */
    --font-primary: 'Hind Siliguri', sans-serif;
    --font-heading: 'Tiro Bangla', serif;
    
    --font-size-base: 16px;
    --font-size-small: 14px;
    --font-size-large: 18px;
    --font-size-h1: 3rem;
    --font-size-h2: 2.5rem;
    --font-size-h3: 2rem;
    --font-size-h4: 1.5rem;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 3rem;
    --spacing-xl: 4rem;
    
    /* Layout */
    --container-max-width: 1200px;
    --border-radius: 8px;
    --transition: all 0.3s ease;
    
    /* Shadows */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
}

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

html {
    scroll-behavior: smooth;
    font-size: var(--font-size-base);
}

body {
    font-family: var(--font-primary);
    line-height: 1.6;
    color: var(--color-secondary);
    background-color: var(--color-white);
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 600;
    line-height: 1.3;
    color: var(--color-secondary);
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

ul {
    list-style: none;
}

/* =============================================
   Utility Classes
   ============================================= */
.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

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

.sr-only-focusable:focus {
    position: static;
    width: auto;
    height: auto;
    padding: var(--spacing-sm);
    margin: 0;
    overflow: visible;
    clip: auto;
    white-space: normal;
    background-color: var(--color-primary);
    color: var(--color-white);
}

/* =============================================
   Buttons
   ============================================= */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    text-decoration: none;
}

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

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

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

.btn-secondary:hover,
.btn-secondary:focus {
    background-color: var(--color-gray-light);
    transform: translateY(-2px);
}

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

.btn-outline:hover,
.btn-outline:focus {
    background-color: var(--color-primary);
    color: var(--color-white);
    transform: translateY(-2px);
}

/* =============================================
   Header & Navigation
   ============================================= */
.site-header {
    background-color: var(--color-secondary);
    padding: var(--spacing-sm) 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

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

.nav-brand .logo {
    color: var(--color-white);
    font-size: var(--font-size-large);
    margin: 0;
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger {
    display: block;
    width: 30px;
    height: 3px;
    background-color: var(--color-white);
    position: relative;
    transition: var(--transition);
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 100%;
    height: 3px;
    background-color: var(--color-white);
    transition: var(--transition);
}

.hamburger::before { top: -10px; }
.hamburger::after { bottom: -10px; }

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

.nav-menu a {
    color: var(--color-white);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
}

.nav-menu a:hover,
.nav-menu a:focus {
    background-color: var(--color-primary);
}

/* =============================================
   Hero Section
   ============================================= */
.hero {
    position: relative;
    min-height: 600px;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: var(--color-white);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    z-index: 1;
}

.hero-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--color-secondary) 0%, var(--color-black) 100%);
    opacity: 0.85;
    z-index: 2;
}

.hero-content {
    position: relative;
    z-index: 3;
    max-width: 800px;
    padding: var(--spacing-xl) var(--spacing-md);
}

.hero-title {
    font-size: var(--font-size-h1);
    margin-bottom: var(--spacing-sm);
    animation: fadeInUp 0.8s ease-out;
}

.hero-subtitle {
    font-size: var(--font-size-large);
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
    animation: fadeInUp 1s ease-out;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-sm);
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.2s ease-out;
}

/* =============================================
   Benefits Section
   ============================================= */
.benefits {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-light);
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--color-secondary);
}

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

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

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

.benefit-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto var(--spacing-sm);
    border-radius: 50%;
    object-fit: cover;
}

.benefit-title {
    color: var(--color-secondary);
    margin-bottom: var(--spacing-sm);
}

.benefit-desc {
    color: var(--color-gray);
    line-height: 1.8;
}

/* =============================================
   Pricing Section
   ============================================= */
.pricing {
    padding: var(--spacing-xl) 0;
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.pricing-card {
    background-color: var(--color-white);
    border: 2px solid var(--color-gray-light);
    border-radius: var(--border-radius);
    overflow: hidden;
    transition: var(--transition);
}

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

.pricing-card.featured {
    border-color: var(--color-primary);
    box-shadow: var(--shadow-md);
}

.pricing-header {
    background-color: var(--color-primary);
    color: var(--color-white);
    padding: var(--spacing-md);
    text-align: center;
    position: relative;
}

.badge {
    position: absolute;
    top: var(--spacing-xs);
    right: var(--spacing-xs);
    background-color: var(--color-white);
    color: var(--color-primary);
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--border-radius);
    font-size: var(--font-size-small);
    font-weight: 600;
}

.package-name {
    font-size: var(--font-size-h3);
    margin-bottom: var(--spacing-xs);
}

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

.price-amount {
    font-size: var(--font-size-h2);
    font-weight: 700;
}

.price-period {
    font-size: var(--font-size-small);
    opacity: 0.9;
}

.package-features {
    padding: var(--spacing-md);
}

.package-features li {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--color-gray-light);
}

.package-features li:last-child {
    border-bottom: none;
}

.pricing-card .btn {
    margin: var(--spacing-md);
    width: calc(100% - var(--spacing-md) * 2);
}

/* =============================================
   Contact Section
   ============================================= */
.contact {
    padding: var(--spacing-xl) 0;
    background-color: var(--color-gray-light);
}

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

.contact-info h3 {
    margin-bottom: var(--spacing-md);
    color: var(--color-secondary);
}

.contact-info address {
    font-style: normal;
    line-height: 2;
}

.contact-info a {
    color: var(--color-primary);
    font-weight: 600;
}

.contact-info a:hover {
    text-decoration: underline;
}

/* Form Styles */
.contact-form {
    background-color: var(--color-white);
    padding: var(--spacing-md);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-sm);
}

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

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

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

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-sm);
    border: 2px solid var(--color-gray-light);
    border-radius: var(--border-radius);
    font-family: var(--font-primary);
    font-size: var(--font-size-base);
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--color-primary);
}

.form-group input.error,
.form-group textarea.error {
    border-color: var(--color-primary);
}

.error-message {
    display: block;
    color: var(--color-primary);
    font-size: var(--font-size-small);
    margin-top: var(--spacing-xs);
    min-height: 20px;
}

.form-success {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background-color: #d4edda;
    color: #155724;
    border-radius: var(--border-radius);
    display: none;
}

.form-success.show {
    display: block;
}

/* =============================================
   Footer
   ============================================= */
.site-footer {
    background-color: var(--color-secondary);
    color: var(--color-white);
    padding: var(--spacing-xl) 0 var(--spacing-md);
}

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

.footer-brand h3,
.footer-links h4,
.footer-contact h4 {
    color: var(--color-white);
    margin-bottom: var(--spacing-sm);
}

.footer-links ul li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a,
.footer-contact a {
    color: var(--color-white);
    opacity: 0.8;
    transition: var(--transition);
}

.footer-links a:hover,
.footer-contact a:hover {
    opacity: 1;
    color: var(--color-primary);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    opacity: 0.7;
}

/* =============================================
   Animations
   ============================================= */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* =============================================
   Responsive Design
   ============================================= */
@media (max-width: 768px) {
    :root {
        --font-size-h1: 2rem;
        --font-size-h2: 1.75rem;
        --font-size-h3: 1.5rem;
    }
    
    .nav-toggle {
        display: block;
    }
    
    .nav-menu {
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: var(--color-secondary);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: 0;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease;
    }
    
    .nav-menu.active {
        max-height: 400px;
    }
    
    .nav-menu li {
        margin: var(--spacing-xs) 0;
    }
    
    .hero {
        min-height: 500px;
    }
    
    .hero-cta {
        flex-direction: column;
        align-items: stretch;
    }
    
    .benefits-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 2rem;
        --spacing-xl: 3rem;
    }
    
    .container {
        padding: 0 var(--spacing-sm);
    }
}

/* =============================================
   Print Styles
   ============================================= */
@media print {
    .site-header,
    .nav-toggle,
    .hero-cta,
    .btn,
    .contact-form,
    .site-footer {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: var(--color-black);
        background: var(--color-white);
    }
    
    .hero {
        min-height: auto;
        page-break-after: always;
    }
    
    .section-title {
        page-break-after: avoid;
    }
    
    .benefit-card,
    .pricing-card {
        page-break-inside: avoid;
    }
    
    a {
        text-decoration: underline;
        color: var(--color-black);
    }
    
    a[href^="tel:"]::after,
    a[href^="mailto:"]::after {
        content: " (" attr(href) ")";
    }
}