/* ==================== Variables & Reset ==================== */
:root {
    --primary: #0D9488;
    --primary-dark: #0F766E;
    --primary-light: #14B8A6;
    --primary-50: #F0FDFA;
    --primary-100: #CCFBF1;
    --accent: #F97316;
    --white: #FFFFFF;
    --gray-50: #F8FAFC;
    --gray-100: #F1F5F9;
    --gray-200: #E2E8F0;
    --gray-300: #CBD5E1;
    --gray-400: #94A3B8;
    --gray-500: #64748B;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1E293B;
    --gray-900: #0F172A;
    --success: #10B981;
    --error: #EF4444;
    --shadow-sm: 0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
    --shadow: 0 4px 6px -1px rgba(0,0,0,0.07), 0 2px 4px -1px rgba(0,0,0,0.04);
    --shadow-md: 0 10px 15px -3px rgba(0,0,0,0.08), 0 4px 6px -2px rgba(0,0,0,0.04);
    --shadow-lg: 0 20px 25px -5px rgba(0,0,0,0.08), 0 10px 10px -5px rgba(0,0,0,0.03);
    --border: #E2E8F0;
    --border-light: #F1F5F9;
    --radius-sm: 6px;
    --radius: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --transition: all 0.2s ease;
    --transition-slow: all 0.3s ease;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--white);
    color: var(--gray-800);
    line-height: 1.6;
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
}

.container { max-width: 1180px; margin: 0 auto; padding: 0 24px; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; height: auto; display: block; }
h1, h2, h3, h4 { color: var(--gray-900); font-weight: 600; letter-spacing: -0.02em; }

/* ==================== Buttons ==================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 10px 20px;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius);
    border: none;
    cursor: pointer;
    transition: var(--transition);
    white-space: nowrap;
    gap: 8px;
}

.btn-primary {
    background: var(--primary);
    color: var(--white);
    box-shadow: 0 1px 2px rgba(13,148,136,0.2), 0 4px 12px rgba(13,148,136,0.15);
}
.btn-primary:hover {
    background: var(--primary-dark);
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(13,148,136,0.2), 0 8px 16px rgba(13,148,136,0.2);
}
.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.btn-outline {
    background: var(--white);
    color: var(--gray-700);
    border: 1px solid var(--gray-300);
}
.btn-outline:hover { border-color: var(--gray-400); background: var(--gray-50); }

.btn-lg { padding: 14px 28px; font-size: 15px; border-radius: var(--radius-lg); }
.btn-full { width: 100%; }

/* ==================== Header ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255,255,255,0.95);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
}

.header-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 64px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 22px;
    font-weight: 700;
}

.logo-icon {
    width: 36px;
    height: 36px;
    background: var(--primary);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
}

.logo-text { color: var(--gray-900); }

.nav { display: flex; gap: 0; }
.nav a {
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-600);
    transition: var(--transition);
    padding: 10px 16px;
    border-radius: var(--radius);
}
.nav a:hover { color: var(--primary); background: var(--primary-50); }
.nav a.nav-active { color: var(--primary); font-weight: 600; }

.header-actions { display: flex; align-items: center; gap: 12px; }

.lang-switch {
    display: flex;
    background: var(--gray-100);
    border-radius: var(--radius);
    padding: 3px;
}
.lang-switch a {
    padding: 6px 12px;
    font-size: 13px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    color: var(--gray-500);
    transition: var(--transition);
}
.lang-switch a.active {
    background: var(--white);
    color: var(--gray-900);
    box-shadow: var(--shadow-sm);
}

.mobile-menu-btn {
    display: none;
    flex-direction: column;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 8px;
}
.mobile-menu-btn span {
    width: 20px;
    height: 2px;
    background: var(--gray-600);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==================== Contact Hero ==================== */
.contact-hero {
    position: relative;
    padding: 140px 0 60px;
    overflow: hidden;
    text-align: center;
}

.contact-hero-bg {
    position: absolute;
    inset: 0;
}

.contact-hero-bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: center;
}

.contact-hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        135deg,
        rgba(15, 23, 42, 0.88) 0%,
        rgba(13, 148, 136, 0.6) 100%
    );
}

.contact-hero-content {
    position: relative;
    z-index: 1;
}

.contact-hero-content h1 {
    font-size: 42px;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 12px;
}

.contact-hero-content p {
    font-size: 17px;
    color: rgba(255,255,255,0.75);
    max-width: 480px;
    margin: 0 auto;
}

/* ==================== Contact Main ==================== */
.contact-main {
    padding: 56px 0 72px;
    background: var(--gray-50);
}

.contact-grid {
    display: grid;
    grid-template-columns: 1fr 380px;
    gap: 32px;
    align-items: start;
}

/* ==================== Form Card ==================== */
.form-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 36px;
    box-shadow: var(--shadow-sm);
}

.form-card h2 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 24px;
    color: var(--gray-900);
}

.form-alert {
    padding: 12px 16px;
    border-radius: var(--radius);
    font-size: 14px;
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}
.form-alert.alert-success {
    background: #ECFDF5;
    border: 1px solid #A7F3D0;
    color: #065F46;
}
.form-alert.alert-error {
    background: #FEF2F2;
    border: 1px solid #FECACA;
    color: #991B1B;
}

.form-body { display: flex; flex-direction: column; gap: 18px; }

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.form-group { display: flex; flex-direction: column; gap: 6px; }

.form-group label {
    font-size: 13px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group select,
.form-group textarea {
    padding: 11px 14px;
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 14px;
    font-family: inherit;
    color: var(--gray-900);
    transition: var(--transition);
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary);
    background: var(--white);
    box-shadow: 0 0 0 3px var(--primary-100);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--gray-400);
}

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

.form-group input.input-error,
.form-group select.input-error,
.form-group textarea.input-error {
    border-color: var(--error);
    box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.1);
}

/* ==================== Sidebar ==================== */
.contact-sidebar {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

/* Info Card */
.info-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    padding: 28px;
    box-shadow: var(--shadow-sm);
}

.info-card h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--gray-900);
}

.info-items { display: flex; flex-direction: column; gap: 18px; }

.info-item {
    display: flex;
    align-items: flex-start;
    gap: 14px;
}

.info-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-50);
    border-radius: var(--radius);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 18px;
    flex-shrink: 0;
}

.info-label {
    display: block;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-500);
    margin-bottom: 2px;
}

.info-value {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-900);
}

a.info-value:hover { color: var(--primary); }

.info-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 20px;
    padding-top: 18px;
    border-top: 1px solid var(--border);
    font-size: 13px;
    font-weight: 500;
    color: var(--success);
}

.badge-dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse-dot 2s ease infinite;
}

@keyframes pulse-dot {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.4; }
}

/* Demo Card */
.demo-card {
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-xl);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
    transition: var(--transition-slow);
}

.demo-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.demo-card-img {
    position: relative;
    height: 160px;
    overflow: hidden;
}

.demo-card-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.4s ease;
}

.demo-card:hover .demo-card-img img {
    transform: scale(1.05);
}

.demo-card-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(
        to top,
        rgba(15, 23, 42, 0.4) 0%,
        transparent 100%
    );
}

.demo-card-body { padding: 24px; }

.demo-card-body h3 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--gray-900);
}

.demo-card-body p {
    font-size: 13px;
    color: var(--gray-500);
    line-height: 1.6;
    margin-bottom: 16px;
}

.demo-badges {
    display: flex;
    gap: 8px;
    flex-wrap: wrap;
    margin-bottom: 18px;
}

.demo-badge {
    font-size: 12px;
    font-weight: 500;
    padding: 5px 10px;
    background: var(--primary-50);
    color: var(--primary-dark);
    border-radius: var(--radius-sm);
    border: 1px solid var(--primary-100);
}

/* ==================== FAQ ==================== */
.contact-faq {
    padding: 64px 0;
    background: var(--white);
}

.section-title {
    font-size: 28px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 32px;
    color: var(--gray-900);
}

.faq-list {
    max-width: 700px;
    margin: 0 auto;
}

.faq-item {
    background: var(--gray-50);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 10px;
    overflow: hidden;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 20px;
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--gray-800);
    cursor: pointer;
    text-align: left;
    transition: var(--transition);
}
.faq-question:hover { color: var(--gray-900); }

.faq-icon {
    width: 22px;
    height: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gray-200);
    border-radius: 50%;
    font-size: 14px;
    color: var(--gray-500);
    transition: var(--transition);
    flex-shrink: 0;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
    background: var(--primary);
    color: var(--white);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease;
}
.faq-item.active .faq-answer { max-height: 200px; }

.faq-answer p {
    padding: 0 20px 16px;
    color: var(--gray-500);
    font-size: 13px;
    line-height: 1.6;
}

/* ==================== Footer ==================== */
.footer {
    padding: 48px 0 24px;
    background: var(--gray-50);
    border-top: 1px solid var(--border);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 40px;
    margin-bottom: 40px;
}

.footer-brand .logo { margin-bottom: 12px; }
.footer-brand p { color: var(--gray-500); font-size: 13px; max-width: 260px; line-height: 1.5; }

.footer-links h4 {
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--gray-900);
    margin-bottom: 12px;
}
.footer-links a {
    display: block;
    color: var(--gray-500);
    font-size: 13px;
    padding: 4px 0;
    transition: var(--transition);
}
.footer-links a:hover { color: var(--gray-900); }

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: 24px;
    border-top: 1px solid var(--border);
}
.footer-bottom p { color: var(--gray-400); font-size: 12px; }

.footer-badges { display: flex; gap: 10px; }
.badge {
    font-size: 11px;
    color: var(--gray-500);
    padding: 4px 10px;
    background: var(--white);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    font-weight: 500;
}

/* ==================== Responsive ==================== */
@media (max-width: 1024px) {
    .contact-grid {
        grid-template-columns: 1fr;
    }
    .contact-sidebar {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: 20px;
    }
}

@media (max-width: 768px) {
    .nav, .header-actions .btn-outline { display: none; }
    .mobile-menu-btn { display: flex; }

    .contact-hero { padding: 110px 0 48px; }
    .contact-hero-content h1 { font-size: 30px; }
    .contact-hero-content p { font-size: 15px; }

    .contact-main { padding: 32px 0 48px; }
    .form-card { padding: 24px 20px; }
    .form-row { grid-template-columns: 1fr; gap: 14px; }

    .contact-sidebar {
        grid-template-columns: 1fr;
    }

    .contact-faq { padding: 48px 0; }
    .section-title { font-size: 22px; }

    .footer-grid { grid-template-columns: 1fr; gap: 24px; }
    .footer-bottom { flex-direction: column; gap: 12px; text-align: center; }

    /* Mobile nav */
    .nav.mobile-open {
        display: flex !important;
        flex-direction: column;
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: rgba(255,255,255,0.98);
        backdrop-filter: blur(12px);
        padding: 16px 24px;
        gap: 4px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
    }
    .nav.mobile-open a { padding: 12px 16px; border-radius: var(--radius); }
    .mobile-menu-btn.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
    .mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
    .mobile-menu-btn.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }
}