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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    color: #333;
    background: #fff;
    line-height: 1.6;
}

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

.header {
    background: #fff;
    border-bottom: 1px solid #e0e0e0;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 0;
}

.logo {
    font-size: 24px;
    font-weight: 700;
    color: #2c3e50;
}

.nav {
    display: flex;
    align-items: center;
    gap: 24px;
}

.nav a {
    text-decoration: none;
    color: #555;
    font-size: 15px;
    transition: color 0.2s;
}

.nav a:hover {
    color: #2563eb;
}

.btn {
    display: inline-block;
    padding: 10px 20px;
    border-radius: 8px;
    font-size: 15px;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    border: none;
    transition: background 0.2s, transform 0.1s;
}

.btn:active {
    transform: scale(0.98);
}

.btn-primary {
    background: #2563eb;
    color: #fff;
}

.btn-primary:hover {
    background: #1d4ed8;
}

.btn-secondary {
    background: #f0f2f5;
    color: #333;
}

.btn-secondary:hover {
    background: #e0e3e8;
}

.btn-outline {
    background: transparent;
    color: #2563eb;
    border: 2px solid #2563eb;
    padding: 8px 18px;
}

.btn-outline:hover {
    background: #2563eb;
    color: #fff;
}

.btn-lg {
    padding: 14px 32px;
    font-size: 16px;
}

.hero {
    background: linear-gradient(135deg, #1e3a5f 0%, #2563eb 100%);
    color: #fff;
    padding: 100px 0 80px;
    text-align: center;
}

.hero-content h1 {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 20px;
    opacity: 0.9;
    max-width: 700px;
    margin: 0 auto 40px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-actions .btn-primary {
    background: #fff;
    color: #2563eb;
}

.hero-actions .btn-primary:hover {
    background: #f0f2f5;
}

.hero-actions .btn-secondary {
    background: rgba(255,255,255,0.15);
    color: #fff;
}

.hero-actions .btn-secondary:hover {
    background: rgba(255,255,255,0.25);
}

.section-title {
    font-size: 36px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 48px;
    color: #1e3a5f;
}

.features {
    padding: 80px 0;
    background: #f8fafc;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.feature-card {
    background: #fff;
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
    transition: transform 0.2s, box-shadow 0.2s;
}

.feature-card:hover {
    transform: translateY(-4px);
    box-shadow: 0 8px 24px rgba(0,0,0,0.1);
}

.feature-icon {
    font-size: 36px;
    margin-bottom: 16px;
}

.feature-card h3 {
    font-size: 20px;
    margin-bottom: 12px;
    color: #1e3a5f;
}

.feature-card p {
    color: #666;
    font-size: 15px;
}

.about {
    padding: 80px 0;
}

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

.about-text p {
    font-size: 17px;
    color: #555;
    margin-bottom: 20px;
}

.about-list {
    list-style: none;
    margin-top: 24px;
}

.about-list li {
    font-size: 16px;
    padding: 8px 0;
    color: #444;
}

.feedback {
    padding: 80px 0;
    background: #f8fafc;
}

.feedback-subtitle {
    text-align: center;
    font-size: 18px;
    color: #666;
    margin-bottom: 40px;
}

.feedback-form {
    max-width: 640px;
    margin: 0 auto;
    background: #fff;
    padding: 40px;
    border-radius: 12px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.06);
}

.form-row {
    display: flex;
    gap: 16px;
}

.form-row .form-group {
    flex: 1;
}

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

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: #333;
    font-size: 14px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid #d0d0d0;
    border-radius: 8px;
    font-size: 15px;
    font-family: inherit;
    transition: border-color 0.2s;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #2563eb;
    box-shadow: 0 0 0 3px rgba(37,99,235,0.1);
}

.feedback-error {
    background: #fee2e2;
    color: #b91c1c;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.feedback-success {
    background: #dcfce7;
    color: #15803d;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 14px;
}

.spinner {
    display: inline-block;
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
    vertical-align: middle;
    margin-left: 8px;
}

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

.footer {
    background: #1e3a5f;
    color: #ccc;
    padding: 40px 0;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 16px;
}

.footer-info p {
    font-size: 14px;
}

.footer-links {
    display: flex;
    gap: 20px;
}

.footer-links a {
    color: #93c5fd;
    text-decoration: none;
    font-size: 14px;
}

.footer-links a:hover {
    color: #fff;
}

.loader-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.92);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s;
}

.loader-overlay.active {
    opacity: 1;
    pointer-events: all;
}

.loader {
    text-align: center;
}

.loader-spinner {
    width: 48px;
    height: 48px;
    border: 4px solid #e0e0e0;
    border-top-color: #2563eb;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 16px;
}

.loader-text {
    font-size: 18px;
    color: #555;
    font-weight: 500;
}

@media (max-width: 768px) {
    .hero-content h1 {
        font-size: 32px;
    }

    .hero-subtitle {
        font-size: 17px;
    }

    .nav {
        gap: 12px;
    }

    .nav a:not(.btn) {
        display: none;
    }

    .form-row {
        flex-direction: column;
        gap: 0;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }
}