/* CSS Variables */
:root {
    --primary-color: #007bff;
    --primary-hover-color: #0056b3;
    --secondary-color: #f8f9fa;
    --text-color: #333;
    --border-color: #e0e0e0;
    --container-width: 1100px;
    --header-height: 70px;
}

/* General Styles */
body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji", "Segoe UI Symbol";
    margin: 0;
    padding-top: var(--header-height);
    line-height: 1.6;
    color: var(--text-color);
    background-color: #fff;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 1rem;
}

section {
    padding: 40px 0;
}

h1, h2, h3 {
    line-height: 1.3;
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; text-align: center; margin-bottom: 40px; }
h3 { font-size: 1.5rem; }

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

a:hover {
    text-decoration: underline;
}

/* Header */
.site-header {
    background-color: #fff;
    border-bottom: 1px solid var(--border-color);
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    z-index: 1000;
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 100%;
}

.logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
}
.logo:hover { text-decoration: none; }

.main-nav ul {
    margin: 0;
    padding: 0;
    list-style: none;
    display: flex;
}

.main-nav li {
    margin-left: 20px;
}

.main-nav a {
    color: var(--text-color);
    font-weight: 500;
    padding: 5px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.3s;
}

.main-nav a:hover,
.main-nav a.active {
    color: var(--primary-color);
    border-bottom-color: var(--primary-color);
    text-decoration: none;
}

/* Footer */
.site-footer {
    background-color: var(--secondary-color);
    color: #6c757d;
    padding: 20px 0;
    text-align: center;
    border-top: 1px solid var(--border-color);
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: bold;
    text-align: center;
    border: 2px solid var(--primary-color);
    background-color: #fff;
    color: var(--primary-color);
    transition: all 0.3s;
}
.btn:hover { text-decoration: none; }

.btn-primary {
    background-color: var(--primary-color);
    color: #fff;
}

.btn:hover {
    background-color: var(--primary-hover-color);
    border-color: var(--primary-hover-color);
    color: #fff;
}

/* Hero Section */
.hero {
    background-color: var(--secondary-color);
    text-align: center;
    padding: 60px 0;
}

.hero .subtitle {
    font-size: 1.2rem;
    color: #6c757d;
    max-width: 600px;
    margin: 20px auto 30px;
}

.hero-buttons .btn {
    margin: 0 10px;
}

/* How it works */
.steps-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    text-align: center;
}

.step-number {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background-color: var(--primary-color);
    color: #fff;
    font-size: 1.5rem;
    font-weight: bold;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
}

/* Advantages */
.advantages { background-color: var(--secondary-color); }
.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}
.card {
    background-color: #fff;
    padding: 25px;
    border: 1px solid var(--border-color);
    border-radius: 8px;
}

/* FAQ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
    border-bottom: 1px solid var(--border-color);
}
.faq-question {
    width: 100%;
    background: none;
    border: none;
    text-align: left;
    padding: 20px 0;
    font-size: 1.2rem;
    font-weight: 500;
    cursor: pointer;
    position: relative;
    padding-right: 30px;
}
.faq-question::after {
    content: '+';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    font-size: 1.5rem;
    color: var(--primary-color);
}
.faq-item.active .faq-question::after {
    content: '−';
}
.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease-out;
}
.faq-answer p { padding: 0 10px 20px; margin: 0; }
.faq-item.active .faq-answer {
    max-height: 200px; /* Adjust as needed */
}

/* Map Page */
.map-layout {
    display: grid;
    grid-template-columns: 2fr 1fr;
    gap: 30px;
    min-height: 500px;
}
.map-container { border-radius: 8px; overflow: hidden; }
.zones-container h3 { text-align: left; }
.zone-filters { margin-bottom: 20px; }
.zone-filters label { display: block; margin-bottom: 10px; cursor: pointer; }
.zone-list { list-style: none; padding: 0; }
.zone-list li { padding: 10px; border-radius: 5px; }
.zone-list li:nth-child(odd) { background-color: var(--secondary-color); }
.zone-list li span {
    display: inline-block;
    padding: 3px 8px;
    border-radius: 12px;
    font-size: 0.8rem;
    margin-left: 10px;
    color: #fff;
    float: right;
}
.zone-list li[data-status="full-coverage"] span { background-color: #28a745; }
.zone-list li[data-status="partial-coverage"] span { background-color: #ffc107; color: #333; }
.zone-list li[data-status="new"] span { background-color: #17a2b8; }

/* Contacts Page */
.contact-layout {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 50px;
}
.social-links { list-style: none; padding: 0; }
.social-links li { margin-bottom: 10px; }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 5px; font-weight: 500; }
.form-group input, .form-group textarea, .form-group select {
    width: 100%;
    padding: 10px;
    border: 1px solid var(--border-color);
    border-radius: 5px;
    font-size: 1rem;
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 123, 255, 0.25);
}
.error-message {
    color: #dc3545;
    font-size: 0.9rem;
    display: none;
    margin-top: 5px;
}
.form-group.invalid .error-message { display: block; }
.form-group.invalid input, .form-group.invalid textarea { border-color: #dc3545; }

.form-result {
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
    display: none;
}
.form-result.success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
    display: block;
}

/* Holder Page */
.calculator-form {
    max-width: 600px;
    margin: 30px auto;
    padding: 30px;
    background-color: var(--secondary-color);
    border-radius: 8px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
    align-items: center;
}
.calculator-result {
    grid-column: 1 / -1;
    text-align: center;
    margin-top: 20px;
}
.calculator-result p { margin: 0; font-size: 1.2rem; }
#income-result {
    font-size: 2.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* AI Page */
.ai-features-list { padding-left: 20px; }
.ai-features-list li { margin-bottom: 10px; }
.flowchart-section { background-color: var(--secondary-color); }
.flowchart {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
}
.flow-item {
    padding: 15px 25px;
    background-color: #fff;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-weight: 500;
}
.flow-arrow { font-size: 2rem; color: var(--primary-color); }
.text-center { text-align: center; }
.privacy-section { background-color: var(--secondary-color); }

/* Call to Action Section */
.call-to-action-section {
    background-color: var(--secondary-color);
    text-align: center;
}
.call-to-action-section p {
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    margin-bottom: 30px;
}

/* Responsive */
@media (max-width: 768px) {
    body { padding-top: 0; }
    .site-header { position: static; height: auto; }
    .site-header .container, .main-nav ul {
        flex-direction: column;
        align-items: center;
    }
    .main-nav ul { padding: 10px 0; }
    .main-nav li { margin: 5px 0; }
    .logo { padding: 15px 0; }

    h1 { font-size: 2rem; }
    h2 { font-size: 1.7rem; }

    .map-layout, .contact-layout { grid-template-columns: 1fr; }
    .calculator-form { grid-template-columns: 1fr; }
}