/* ============================================
   Internet Recharge Hub - Main Stylesheet
   Digital Knowledge Center Theme
   ============================================ */

/* CSS Variables */
:root {
    --primary-turquoise: #00B4A0;
    --primary-turquoise-dark: #008B7D;
    --primary-turquoise-light: #E0F7F4;
    --dark-grey: #2D3436;
    --medium-grey: #636E72;
    --light-grey: #B2BEC3;
    --white: #FFFFFF;
    --off-white: #F8FAFB;
    --accent-blue: #0984E3;
    --shadow-light: rgba(0, 0, 0, 0.08);
    --shadow-medium: rgba(0, 0, 0, 0.12);
    --border-radius: 8px;
    --transition: all 0.3s ease;
}

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

html {
    scroll-behavior: smooth;
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.7;
    color: var(--dark-grey);
    background-color: var(--white);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.3;
    color: var(--dark-grey);
    margin-bottom: 1rem;
}

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

p {
    margin-bottom: 1rem;
    color: var(--medium-grey);
}

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

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

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

/* Header & Navigation */
header {
    background: var(--white);
    box-shadow: 0 2px 10px var(--shadow-light);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 20px;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.4rem;
    font-weight: 700;
    color: var(--dark-grey);
}

.logo-icon {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary-turquoise), var(--primary-turquoise-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--white);
    font-size: 1.2rem;
}

nav ul {
    display: flex;
    list-style: none;
    gap: 5px;
}

nav ul li a {
    padding: 10px 15px;
    color: var(--dark-grey);
    font-weight: 500;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 0.95rem;
}

nav ul li a:hover,
nav ul li a.active {
    background: var(--primary-turquoise-light);
    color: var(--primary-turquoise-dark);
}

/* Mobile Menu Toggle */
.menu-toggle {
    display: none;
    flex-direction: column;
    cursor: pointer;
    gap: 5px;
    padding: 10px;
}

.menu-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark-grey);
    border-radius: 2px;
    transition: var(--transition);
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, var(--primary-turquoise-light) 0%, var(--white) 100%);
    padding: 80px 20px;
    text-align: center;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
}

.hero h1 {
    font-size: 3rem;
    margin-bottom: 1.5rem;
    color: var(--dark-grey);
}

.hero p {
    font-size: 1.2rem;
    color: var(--medium-grey);
    margin-bottom: 2rem;
}

.hero-visual {
    margin-top: 40px;
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
}

.hero-icon {
    width: 120px;
    height: 120px;
    background: linear-gradient(135deg, var(--primary-turquoise), var(--primary-turquoise-dark));
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 10px 40px rgba(0, 180, 160, 0.3);
}

.hero-icon svg {
    width: 60px;
    height: 60px;
    fill: var(--white);
}

.data-flow {
    display: flex;
    gap: 8px;
    align-items: center;
}

.flow-dot {
    width: 12px;
    height: 12px;
    background: var(--primary-turquoise);
    border-radius: 50%;
    animation: pulse 1.5s ease-in-out infinite;
}

.flow-dot:nth-child(2) { animation-delay: 0.2s; }
.flow-dot:nth-child(3) { animation-delay: 0.4s; }
.flow-dot:nth-child(4) { animation-delay: 0.6s; }
.flow-dot:nth-child(5) { animation-delay: 0.8s; }

@keyframes pulse {
    0%, 100% { opacity: 0.3; transform: scale(0.8); }
    50% { opacity: 1; transform: scale(1.2); }
}

/* Main Content */
main {
    flex: 1;
    padding: 60px 20px;
}

.content-section {
    max-width: 900px;
    margin: 0 auto 60px;
}

.content-section h2 {
    color: var(--primary-turquoise-dark);
    border-bottom: 3px solid var(--primary-turquoise);
    padding-bottom: 10px;
    margin-bottom: 30px;
}

/* Info Cards */
.info-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    margin: 40px 0;
}

.info-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 30px;
    box-shadow: 0 4px 20px var(--shadow-light);
    border: 1px solid var(--light-grey);
    transition: var(--transition);
}

.info-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px var(--shadow-medium);
}

.info-card-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-turquoise-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

.info-card-icon svg {
    width: 30px;
    height: 30px;
    fill: var(--primary-turquoise);
}

.info-card h3 {
    margin-bottom: 10px;
}

.info-card p {
    font-size: 0.95rem;
}

/* Feature Box */
.feature-box {
    background: var(--primary-turquoise-light);
    border-left: 4px solid var(--primary-turquoise);
    padding: 25px 30px;
    margin: 30px 0;
    border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.feature-box h4 {
    color: var(--primary-turquoise-dark);
    margin-bottom: 10px;
}

/* Infographic Section */
.infographic {
    background: var(--off-white);
    padding: 50px 20px;
    margin: 40px 0;
    border-radius: var(--border-radius);
}

.infographic h3 {
    text-align: center;
    margin-bottom: 40px;
}

.infographic-steps {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    gap: 30px;
}

.step {
    text-align: center;
    max-width: 200px;
}

.step-number {
    width: 50px;
    height: 50px;
    background: var(--primary-turquoise);
    color: var(--white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0 auto 15px;
}

.step h4 {
    margin-bottom: 10px;
}

.step p {
    font-size: 0.9rem;
}

/* FAQ Section */
.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    border: 1px solid var(--light-grey);
    border-radius: var(--border-radius);
    margin-bottom: 15px;
    overflow: hidden;
}

.faq-question {
    padding: 20px 25px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    background: var(--off-white);
    font-weight: 600;
    color: var(--dark-grey);
    transition: var(--transition);
}

.faq-question:hover {
    background: var(--primary-turquoise-light);
}

.faq-question::after {
    content: '+';
    font-size: 1.5rem;
    color: var(--primary-turquoise);
    transition: var(--transition);
}

.faq-item.active .faq-question::after {
    content: '−';
}

.faq-answer {
    padding: 0 25px;
    max-height: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-item.active .faq-answer {
    padding: 20px 25px;
    max-height: 500px;
}

/* Tables */
.data-table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: var(--white);
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: 0 2px 10px var(--shadow-light);
}

.data-table th,
.data-table td {
    padding: 15px 20px;
    text-align: left;
    border-bottom: 1px solid var(--light-grey);
}

.data-table th {
    background: var(--primary-turquoise);
    color: var(--white);
    font-weight: 600;
}

.data-table tr:hover {
    background: var(--primary-turquoise-light);
}

/* Contact Form */
.contact-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 50px;
    margin-top: 40px;
}

.contact-info-item {
    display: flex;
    align-items: flex-start;
    gap: 15px;
    margin-bottom: 25px;
}

.contact-icon {
    width: 50px;
    height: 50px;
    background: var(--primary-turquoise-light);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.contact-icon svg {
    width: 24px;
    height: 24px;
    fill: var(--primary-turquoise);
}

.contact-form {
    background: var(--off-white);
    padding: 40px;
    border-radius: var(--border-radius);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--dark-grey);
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 15px;
    border: 2px solid var(--light-grey);
    border-radius: var(--border-radius);
    font-family: inherit;
    font-size: 1rem;
    transition: var(--transition);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

.btn {
    display: inline-block;
    padding: 14px 30px;
    background: var(--primary-turquoise);
    color: var(--white);
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

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

/* Disclaimer */
.disclaimer {
    background: #FFF3CD;
    border: 1px solid #FFD93D;
    border-radius: var(--border-radius);
    padding: 20px 25px;
    margin: 30px 0;
}

.disclaimer h4 {
    color: #856404;
    margin-bottom: 10px;
}

.disclaimer p {
    color: #856404;
    margin: 0;
    font-size: 0.95rem;
}

/* Footer */
footer {
    background: var(--dark-grey);
    color: var(--white);
    padding: 50px 20px 20px;
    margin-top: auto;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    color: var(--primary-turquoise);
    margin-bottom: 20px;
}

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

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--light-grey);
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-turquoise);
}

.footer-disclaimer {
    background: rgba(255, 255, 255, 0.1);
    padding: 20px;
    border-radius: var(--border-radius);
    margin-top: 30px;
    font-size: 0.9rem;
    line-height: 1.6;
}

.footer-disclaimer p {
    color: var(--light-grey);
    margin: 0;
}

.footer-bottom {
    text-align: center;
    padding-top: 30px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    color: var(--light-grey);
    font-size: 0.9rem;
}

/* Page Header */
.page-header {
    background: linear-gradient(135deg, var(--primary-turquoise) 0%, var(--primary-turquoise-dark) 100%);
    color: var(--white);
    padding: 60px 20px;
    text-align: center;
}

.page-header h1 {
    color: var(--white);
    margin-bottom: 10px;
}

.page-header p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

/* Breadcrumb */
.breadcrumb {
    padding: 15px 0;
    font-size: 0.9rem;
}

.breadcrumb a {
    color: var(--medium-grey);
}

.breadcrumb span {
    color: var(--dark-grey);
}

/* Responsive Design */
@media (max-width: 992px) {
    .hero h1 {
        font-size: 2.5rem;
    }
    
    .contact-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    .header-content {
        flex-wrap: wrap;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    nav {
        width: 100%;
        max-height: 0;
        overflow: hidden;
        transition: var(--transition);
    }
    
    nav.active {
        max-height: 400px;
        padding: 15px 0;
    }
    
    nav ul {
        flex-direction: column;
        gap: 0;
    }
    
    nav ul li a {
        display: block;
        padding: 12px 15px;
    }
    
    .hero {
        padding: 50px 20px;
    }
    
    .hero h1 {
        font-size: 2rem;
    }
    
    .hero-visual {
        flex-direction: column;
    }
    
    .hero-icon {
        width: 100px;
        height: 100px;
    }
    
    .infographic-steps {
        flex-direction: column;
        align-items: center;
    }
    
    .step {
        max-width: 100%;
    }
    
    h1 { font-size: 2rem; }
    h2 { font-size: 1.6rem; }
    h3 { font-size: 1.3rem; }
    
    main {
        padding: 40px 15px;
    }
    
    .content-section {
        margin-bottom: 40px;
    }
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.2rem;
    }
    
    .logo-icon {
        width: 35px;
        height: 35px;
    }
    
    .info-cards {
        grid-template-columns: 1fr;
    }
    
    .contact-form {
        padding: 25px;
    }
    
    .data-table {
        font-size: 0.9rem;
    }
    
    .data-table th,
    .data-table td {
        padding: 10px 15px;
    }
}

/* Print Styles */
@media print {
    header, footer, .menu-toggle {
        display: none;
    }
    
    body {
        font-size: 12pt;
        color: #000;
    }
    
    .hero {
        background: none;
        padding: 20px 0;
    }
    
    .info-card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}

/* Utility Classes */
.text-center { text-align: center; }
.text-turquoise { color: var(--primary-turquoise); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }
.mt-40 { margin-top: 40px; }
.mb-40 { margin-bottom: 40px; }