/* ==========================================================================
   ICGL18 — Responsive Breakpoints
   ========================================================================== */

/* Tablet landscape and below */
@media (max-width: 1024px) {
    .welcome-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .cfp-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .cfp-sidebar {
        display: grid;
        grid-template-columns: 1fr 1fr;
        gap: var(--space-lg);
    }

    .venue-grid {
        gap: var(--space-2xl);
    }

    .contact-grid {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }

    .footer-grid {
        grid-template-columns: 1fr 1fr;
        gap: var(--space-xl);
    }
}

/* Tablet portrait */
@media (max-width: 768px) {
    :root {
        --space-3xl: 4rem;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.97);
        backdrop-filter: blur(16px);
        -webkit-backdrop-filter: blur(16px);
        flex-direction: column;
        padding: var(--space-lg);
        gap: var(--space-xs);
        border-bottom: 1px solid var(--border-light);
        transform: translateY(-110%);
        opacity: 0;
        transition: transform var(--transition-med), opacity var(--transition-med);
        pointer-events: none;
        z-index: 999;
    }

    .nav-links.open {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-links a {
        font-size: 0.95rem;
        padding: 0.75rem 1rem;
        width: 100%;
    }

    .speakers-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

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

    .cfp-date-row {
        flex-wrap: wrap;
        gap: 0.25rem 1rem;
    }

    .cfp-date-label,
    .cfp-date-value {
        white-space: normal;
    }

    .cfp-date-value {
        margin-left: 0;
    }

    .reg-cards {
        grid-template-columns: 1fr;
        max-width: 400px;
    }

    .programme-preview {
        grid-template-columns: repeat(2, 1fr);
    }

    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }

    .hero-meta {
        flex-direction: column;
        gap: var(--space-md);
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
    }

    .hero-actions .btn {
        width: 100%;
        max-width: 280px;
    }

    .announcement-item {
        flex-direction: column;
        gap: var(--space-md);
    }

    .announcement-date {
        text-align: left;
    }
}

/* Hide fixed uni logo on small tablets and below */
@media (max-width: 768px) {
    .uni-logo-bar {
        position: static;
        margin-top: 72px;
        padding: 10px 16px;
        justify-content: center;
        background: var(--white);
        border-bottom: 1px solid var(--border-light);
    }
}

/* Mobile */
@media (max-width: 480px) {
    :root {
        --space-3xl: 3rem;
        --space-2xl: 2rem;
    }

    body {
        font-size: 15px;
    }

    .container {
        padding: 0 var(--space-md);
    }

    .nav-inner {
        padding: 0 var(--space-md);
    }

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

    .programme-preview {
        grid-template-columns: 1fr;
    }

    .hero-section {
        padding: 100px var(--space-md) var(--space-2xl);
    }

    .hero-title-main {
        font-size: 2.5rem;
    }

    .section-title {
        font-size: 1.8rem;
    }
}