/* ===========================
   Dark Theme Overrides
   =========================== */
[data-theme="dark"] {
    --bg: #0f1724;
    --bg-alt: #162032;
    --bg-card: #1a2540;
    --text: #e2e8f0;
    --text-secondary: #a0aec0;
    --text-muted: #718096;
    --border: #2d3748;
    --shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 40px rgba(0, 0, 0, 0.4);
}

[data-theme="dark"] .navbar {
    background: #0f1724;
    border-bottom-color: #2d3748;
}

[data-theme="dark"] .hero-overlay {
    background: linear-gradient(
        135deg,
        rgba(1, 122, 155, 0.92) 0%,
        rgba(0, 175, 123, 0.85) 100%
    );
}

[data-theme="dark"] .form-group input,
[data-theme="dark"] .form-group textarea {
    background: #162032;
    border-color: #2d3748;
    color: #e2e8f0;
}

[data-theme="dark"] .form-group input:focus,
[data-theme="dark"] .form-group textarea:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(1, 122, 155, 0.2);
}

[data-theme="dark"] .dropdown-menu {
    background: #1a2540;
    border-color: #2d3748;
}

[data-theme="dark"] .footer {
    background: #0a1019;
}

[data-theme="dark"] .footer-affiliation {
    background: #162032;
    border-color: #2d3748;
}

[data-theme="dark"] .social-links a {
    border-color: #2d3748;
    color: #a0aec0;
}

[data-theme="dark"] .social-links a:hover {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

[data-theme="dark"] .nav-menu {
    background: #0f1724;
}

[data-theme="dark"] .hamburger,
[data-theme="dark"] .hamburger::before,
[data-theme="dark"] .hamburger::after {
    background: #e2e8f0;
}

[data-theme="dark"] .nav-toggle.active .hamburger {
    background: transparent;
}

[data-theme="dark"] .btn-primary {
    background: #fff;
    color: var(--primary);
}

[data-theme="dark"] .affiliation-bar {
    background: #162032;
    border-bottom-color: #2d3748;
}

[data-theme="dark"] .page-header {
    background: #162032;
    border-bottom-color: #2d3748;
}