/* 5G Information Resource - Minimal Tech Variant */
/* Variant C: Clean, minimalist design with emerald accents */

:root {
    --bg-primary: #ffffff;
    --bg-secondary: #f9f9f9;
    --text-primary: #1a1a1a;
    --text-secondary: #4a4a4a;
    --accent-emerald: #50c878;
    --accent-emerald-dark: #3a9d5c;
    --border-color: #e0e0e0;
    --divider-color: #d0d0d0;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.7;
    font-size: 16px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

/* Header */
header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--divider-color);
    padding: 20px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.logo {
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
    letter-spacing: -0.5px;
}

.logo span {
    color: var(--accent-emerald);
}

nav ul {
    display: flex;
    list-style: none;
    gap: 30px;
}

nav a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
}

nav a:hover,
nav a.active {
    color: var(--accent-emerald);
}

/* Main Content */
main {
    min-height: calc(100vh - 200px);
    padding: 60px 0;
}

h1 {
    font-size: 42px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    letter-spacing: -1px;
}

h2 {
    font-size: 28px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 40px 0 20px 0;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--divider-color);
}

h3 {
    font-size: 22px;
    font-weight: 600;
    color: var(--text-primary);
    margin: 30px 0 15px 0;
}

p {
    margin-bottom: 20px;
    color: var(--text-secondary);
}

/* Sections */
.section {
    margin-bottom: 50px;
}

.content-box {
    background-color: var(--bg-secondary);
    padding: 30px;
    border-radius: 4px;
    border: 1px solid var(--border-color);
    margin-bottom: 25px;
}

/* Lists */
ul, ol {
    margin-left: 25px;
    margin-bottom: 20px;
}

li {
    margin-bottom: 10px;
    color: var(--text-secondary);
}

/* Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 25px;
    margin: 30px 0;
}

.card {
    background-color: var(--bg-primary);
    border: 1px solid var(--border-color);
    padding: 30px;
    border-radius: 4px;
    transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    border-color: var(--accent-emerald);
}

.card h3 {
    margin-top: 0;
    color: var(--accent-emerald-dark);
}

/* Accordion for FAQ */
.accordion {
    border: 1px solid var(--border-color);
    border-radius: 4px;
    margin-bottom: 15px;
}

.accordion-header {
    background-color: var(--bg-secondary);
    padding: 20px;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-weight: 600;
    color: var(--text-primary);
    transition: background-color 0.3s ease;
}

.accordion-header:hover {
    background-color: #f0f0f0;
}

.accordion-content {
    padding: 20px;
    display: none;
    border-top: 1px solid var(--divider-color);
    color: var(--text-secondary);
}

.accordion.active .accordion-content {
    display: block;
}

.accordion-icon {
    font-size: 20px;
    color: var(--accent-emerald);
}

/* Contact Form */
.form-group {
    margin-bottom: 25px;
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}

.form-group input,
.form-group textarea,
.form-group select {
    width: 100%;
    padding: 12px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.form-group input:focus,
.form-group textarea:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-emerald);
    box-shadow: 0 0 0 3px rgba(80, 200, 120, 0.1);
}

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

.form-submit {
    background-color: var(--accent-emerald);
    color: white;
    padding: 14px 40px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.form-submit:hover {
    background-color: var(--accent-emerald-dark);
}

.contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
    margin: 30px 0;
}

.contact-item {
    padding: 25px;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.contact-item h4 {
    color: var(--accent-emerald-dark);
    margin-bottom: 10px;
    font-size: 18px;
}

.contact-item p {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Disclaimers */
.disclaimer {
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    padding: 20px;
    margin: 30px 0;
    border-radius: 4px;
    font-size: 14px;
}

.disclaimer-text {
    color: var(--text-secondary);
    margin-bottom: 0;
}

/* Footer */
footer {
    background-color: var(--bg-primary);
    border-top: 1px solid var(--divider-color);
    padding: 30px 0;
    margin-top: 60px;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-wrap: wrap;
    gap: 30px;
}

.footer-section {
    flex: 1;
    min-width: 200px;
}

.footer-section h4 {
    color: var(--text-primary);
    margin-bottom: 15px;
    font-size: 16px;
}

.footer-section ul {
    list-style: none;
    margin-left: 0;
    margin-bottom: 0;
}

.footer-section a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    display: block;
    margin-bottom: 8px;
    transition: color 0.3s ease;
}

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

.footer-bottom {
    text-align: center;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--divider-color);
    font-size: 14px;
    color: var(--text-secondary);
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 20px;
    }
    
    h1 {
        font-size: 32px;
    }
    
    h2 {
        font-size: 24px;
    }
    
    .header-content {
        flex-direction: column;
        gap: 15px;
    }
    
    nav ul {
        gap: 15px;
        flex-wrap: wrap;
        justify-content: center;
    }
    
    .cards-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        flex-direction: column;
    }
}

/* Utility Classes */
.text-emerald {
    color: var(--accent-emerald);
}

.divider {
    border: none;
    border-top: 1px solid var(--divider-color);
    margin: 40px 0;
}

.spacer {
    height: 40px;
}