/* ============================================================
   Mobile_style2.css  –  Mobile / Responsive Overrides
   Breakpoints: 768px (tablet), 480px (phone), 360px (small phone)
   ============================================================ */

/* ── 1. Hamburger Menu (critical – missing in style.css) ─────── */
@media (max-width: 768px) {

    /* Show the toggle button, remove browser default padding */
    .nav-toggle {
        display: block;
        padding: 0;
        line-height: 1;
    }

    /* Hide nav by default on mobile */
    .nav-menu {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(12px);
        border-bottom: 1px solid var(--border-color);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
        flex-direction: column;
        gap: 0;
        padding: 8px 0 16px;
        z-index: 999;
    }

    /* Show when .active is toggled by JS */
    .nav-menu.active {
        display: flex;
    }

    .nav-menu li {
        width: 100%;
    }

    .nav-menu a {
        display: block;
        padding: 12px 24px;
        font-size: 17px;
        border-bottom: 1px solid rgba(0, 0, 0, 0.04);
    }

    .nav-menu a::after {
        display: none;
    }

    /* Navbar container must be relative so the dropdown positions correctly */
    .navbar .container {
        position: relative;
    }
}

/* ── 2. Body & Global ────────────────────────────────────────── */
@media (max-width: 768px) {
    body {
        font-size: 16px;
    }

    /* align navbar content with page-body edge (12px margin each side) */
    .container {
        padding: 0 12px;
    }
}

@media (max-width: 480px) {
    /* page-body goes full-width with 16px inner padding → match here */
    .container {
        padding: 0 16px;
    }
}

/* ── 3. Page Body (sub-pages) ────────────────────────────────── */
@media (max-width: 768px) {
    .page-body {
        width: calc(100% - 24px);
        padding: 28px 20px;
        margin: 12px auto 32px;
        border-radius: 6px;
    }

    .page-body-standalone {
        margin-top: 74px;
    }
}

@media (max-width: 480px) {
    .page-body {
        width: 100%;
        border-radius: 0;
        margin: 0 auto 24px;
        padding: 20px 16px;
    }

    .page-body-standalone {
        margin-top: 62px;
    }
}

/* ── 4. Sub-page Title Bar ───────────────────────────────────── */
@media (max-width: 768px) {
    .page-title-bar {
        margin: -28px -20px 32px;
        padding: 32px 20px 28px;
    }

    .page-title-bar h1 {
        font-size: 28px;
        letter-spacing: -0.2px;
    }

    .page-title-bar p {
        font-size: 16px;
    }
}

@media (max-width: 480px) {
    .page-title-bar {
        margin: -20px -16px 24px;
        padding: 24px 16px 20px;
    }

    .page-title-bar h1 {
        font-size: 24px;
    }
}

/* ── 5. Hero Section ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .hero {
        padding: 100px 16px 60px;
        min-height: auto;
    }

    .hero h1 {
        font-size: 34px;
        letter-spacing: -0.3px;
        margin-bottom: 16px;
    }

    .hero .tagline {
        font-size: 18px;
        margin-bottom: 24px;
    }

    .hero-actions {
        flex-direction: column;
        align-items: center;
        gap: 12px;
    }

    .keywords {
        gap: 8px;
    }

    .chip {
        font-size: 13px;
        padding: 8px 14px;
    }
}

@media (max-width: 480px) {
    .hero h1 {
        font-size: 28px;
    }

    .hero .tagline {
        font-size: 16px;
    }
}

/* ── 6. Sections ─────────────────────────────────────────────── */
@media (max-width: 768px) {
    .section {
        padding: 48px 0;
    }

    .section h2 {
        font-size: 26px;
    }

    .section-header {
        margin-bottom: 32px;
    }
}

/* ── 7. Team Grid ────────────────────────────────────────────── */
@media (max-width: 768px) {
    .team-grid {
        grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
        gap: 16px;
    }
}

@media (max-width: 480px) {
    .team-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 12px;
    }

    .faculty-card {
        grid-template-columns: 1fr;
    }
}

/* ── 8. Research / Teaching / OpenSource Grids ───────────────── */

/* Desktop: 4-column research grid (replaces inline style) */
.research-grid-4col {
    grid-template-columns: repeat(4, 1fr);
}

@media (max-width: 1024px) {
    .research-grid-4col {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .research-grid,
    .research-grid-4col,
    .opensource-grid,
    .teaching-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .research-card {
        padding: 24px 20px;
    }
}

/* ── 9. Publications ─────────────────────────────────────────── */
@media (max-width: 768px) {
    .publication-item {
        flex-direction: column;
        gap: 12px;
        padding: 16px;
    }

    .pub-thumb {
        width: 100%;
        height: 160px;
    }

    .publication-title {
        font-size: 16px;
    }
}

/* ── 9b. Research Highlights (faculty-card used as highlight row) ── */
@media (max-width: 768px) {
    .faculty-card {
        grid-template-columns: 1fr;
    }

    .faculty-left {
        border-right: none;
        border-bottom: 1px solid var(--border-color);
        padding: 20px;
    }

    .faculty-right {
        padding: 20px 20px 24px;
    }
}

/* ── 10. Biography / Biosketch ───────────────────────────────── */
@media (max-width: 768px) {
    .biosketch-grid {
        grid-template-columns: 1fr;
        gap: 24px;
    }

    .biosketch-image .image-placeholder {
        width: 100%;
        max-width: 260px;
        height: 260px;
        margin: 0 auto;
    }

    .biosketch-content h3 {
        font-size: 22px;
    }

    .biosketch-content .lead {
        font-size: 18px;
    }

    .stats-row {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .stat-number {
        font-size: 30px;
    }
}

/* ── 11. Contact Grid ────────────────────────────────────────── */
@media (max-width: 768px) {
    .contact-grid {
        grid-template-columns: 1fr;
        gap: 32px;
    }
}

/* ── 12. Footer ──────────────────────────────────────────────── */
@media (max-width: 768px) {
    .footer-content {
        flex-direction: column;
        align-items: center;
        text-align: center;
        gap: 16px;
    }

    .footer-left {
        text-align: center;
    }

    .visitor-section {
        flex-direction: column;
        gap: 16px;
    }
}

/* ── 13. Zoom Controls – hide on touch devices ───────────────── */
@media (max-width: 768px) {
    .zoom-controls {
        display: none;
    }
}

/* ── 13c. Resources page ─────────────────────────────────────── */

/* — Opensource cards: keep left-right layout on mobile — */
@media (max-width: 768px) {
    .opensource-grid {
        grid-template-columns: 1fr;
        gap: 16px;
    }

    /* Keep horizontal layout, shrink image */
    .oc-card-inner {
        flex-direction: row;
        gap: 14px;
        align-items: stretch;
    }

    .opensource-card:has(.oc-card-inner) {
        padding: 0;
        overflow: hidden;
    }

    .opensource-card-img {
        width: 110px;
        flex-shrink: 0;
        align-self: stretch;
    }

    .opensource-card-img img {
        width: 110px;
        height: 100%;
        min-height: 130px;
        object-fit: cover;
        border-radius: 0;
        display: block;
    }

    .opensource-card:has(.oc-card-inner) .opensource-card-body {
        padding: 12px 14px 12px 0;
        flex: 1;
        min-width: 0;
    }

    .opensource-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 2px;
        margin-bottom: 6px;
    }

    .oc-title-row {
        gap: 6px;
    }

    .oc-title-row i {
        font-size: 16px;
    }

    .opensource-card h3 {
        font-size: 14px;
        line-height: 1.4;
        margin-bottom: 4px;
    }

    .opensource-card p {
        font-size: 12px;
        line-height: 1.6;
        margin-bottom: 8px;
        display: -webkit-box;
        -webkit-line-clamp: 3;
        -webkit-box-orient: vertical;
        overflow: hidden;
    }

    .opensource-stats {
        font-size: 12px;
    }

    .card-tags {
        gap: 4px;
    }

    .opensource-card .tag {
        font-size: 11px;
        padding: 2px 8px;
    }

    .oc-github-btn {
        display: inline-flex;
        margin-top: 8px;
        font-size: 13px;
        gap: 5px;
    }
}

@media (max-width: 400px) {
    .opensource-card-img {
        width: 90px;
    }

    .opensource-card-img img {
        width: 90px;
    }
}

/* — Introductory Reading: stack label above link — */
@media (max-width: 640px) {
    .reading-item {
        flex-direction: column !important;
        align-items: flex-start !important;
        gap: 6px !important;
        padding: 14px 4px !important;
    }

    .reading-label {
        width: auto !important;
        text-align: left !important;
    }

    .reading-content a {
        font-size: 15px !important;
    }

    .reading-content > div {
        font-size: 14px !important;
    }
}

/* — Useful Links: stack name above URL — */
@media (max-width: 640px) {
    .alumni-list li {
        flex-direction: column;
        align-items: flex-start;
        gap: 3px;
    }

    .alumni-name {
        min-width: unset;
        font-size: 15px;
    }

    .alumni-meta {
        font-size: 14px;
        word-break: break-word;
    }
}

/* ── 13b. Back-to-top – mobile position ──────────────────────── */
@media (max-width: 768px) {
    #back-to-top {
        bottom: 20px;
        right: 20px;
        width: 48px;
        height: 48px;
        font-size: 18px;
    }
}

/* ── 14. Publication Scroll Banner ──────────────────────────── */
@media (max-width: 600px) {
    .pub-scroll-banner {
        display: none;
    }
}

/* ── 15. Intro / Project pages ───────────────────────────────── */
@media (max-width: 768px) {
    /* intro pages typically use a 2-col layout */
    .intro-grid,
    .project-grid {
        grid-template-columns: 1fr !important;
    }

    /* wide images inside page body */
    .page-body img {
        max-width: 100%;
        height: auto;
    }

    /* tables that overflow */
    .page-body table {
        display: block;
        overflow-x: auto;
        -webkit-overflow-scrolling: touch;
    }
}

/* ── 16. Buttons / CTAs ──────────────────────────────────────── */
@media (max-width: 480px) {
    .btn,
    .cta-btn,
    .hero-btn {
        width: 100%;
        text-align: center;
        justify-content: center;
    }
}

/* ── 17. News items ──────────────────────────────────────────── */
@media (max-width: 768px) {
    .news-item {
        padding: 16px;
    }

    .news-grid,
    .news-list {
        grid-template-columns: 1fr;
    }
}

/* ── 18. News archive pages (news-2023/24/25) ────────────────── */
@media (max-width: 480px) {
    .news-item-header {
        flex-direction: column;
        gap: 4px;
    }
}

/* ── 19. Small phone fine-tuning (≤ 360px) ───────────────────── */
@media (max-width: 360px) {
    body {
        font-size: 15px;
    }

    .page-title-bar h1 {
        font-size: 22px;
    }

    .hero h1 {
        font-size: 24px;
    }

    .nav-brand span {
        font-size: 15px;
    }
}