/* mobile.css — responsive styles for tablets and phones */

/* ===========================
   Tablet & below (≤ 992px)
   =========================== */
@media (max-width: 992px) {
    /* --- Navbar: hamburger layout --- */
    .navbar {
        height: auto;
        min-height: 60px;
        padding: 10px 5%;
    }

    .nav-logo img {
        height: 44px;
    }

    .nav-toggle {
        display: flex;
    }

    .nav-links {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        background-color: var(--color-white);
        border-bottom: 1px solid rgba(59, 53, 53, 0.15);
        box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        padding: 0;
        max-height: 0;
        overflow: hidden;
        opacity: 0;
        pointer-events: none;
        transition: max-height 0.35s ease, opacity 0.25s ease;
        z-index: 999;
    }

    .navbar.menu-open .nav-links {
        max-height: 420px;
        opacity: 1;
        pointer-events: auto;
        padding: 8px 0 16px;
    }

    .nav-links a {
        display: block;
        padding: 14px 5%;
        font-size: 13px;
        border-bottom: 1px solid rgba(59, 53, 53, 0.08);
    }

    .nav-links a:last-child {
        border-bottom: none;
    }

    #joinBtn {
        margin: 8px 5% 0;
        text-align: center;
        display: block;
    }

    /* --- Scroll container --- */
    .snap-container {
        margin-top: 60px;
        height: calc(100vh - 60px);
        height: calc(100dvh - 60px);
        -webkit-overflow-scrolling: touch;
    }

    .block {
        scroll-margin-top: 60px;
        min-height: auto;
        padding-top: 40px;
        padding-bottom: 40px;
    }

    /* --- Typography --- */
    .content {
        padding-left: 5%;
        padding-right: 5%;
    }

    .content h2 {
        font-size: clamp(28px, 7vw, 48px);
        max-width: 100%;
    }

    .content h3 {
        padding-left: 0;
        font-size: 20px;
    }

    .content p {
        padding-left: 0;
        max-width: 100%;
        font-size: 16px;
    }

    /* --- Puzzle decorations: smaller, less intrusive --- */
    .puzzle {
        width: 120px;
        max-width: 35vw;
        opacity: 0.35 !important;
    }

    .p-center-bg {
        width: 260px;
    }

    .block.active .p-center-bg {
        opacity: 0.06 !important;
    }

    /* --- Member leaders --- */
    #member .content {
        max-width: 100%;
    }

    .leaders-grid {
        grid-template-columns: 1fr;
        gap: 20px;
        margin-top: 24px;
    }

    .leader-img {
        width: 35%;
    }

    /* --- Project / accordion --- */
    #project .content h2 {
        padding-left: 5%;
    }

    .filter-container {
        width: 90%;
    }

    .accordion-header {
        padding-left: 5%;
        padding-right: 5%;
        font-size: 16px;
        gap: 12px;
    }

    .accordion-header span:first-child {
        flex: 1;
        padding-right: 8px;
    }

    .accordion-body {
        padding-left: 5%;
        padding-right: 5%;
    }

    .accordion-body .project-video iframe {
        width: 100%;
        height: auto;
        aspect-ratio: 16 / 9;
        max-width: 100%;
    }

    .students-bio {
        width: calc(50% - 12px);
        min-width: 120px;
    }

    /* --- Gallery --- */
    #workshop_showcase .content {
        max-width: 100%;
    }

    .gallery-item {
        width: calc(50% - 10px);
    }

    .gallery-wrap.collapsed {
        max-height: 520px;
    }

    /* --- Photo scatter --- */
    #photoSection {
        min-height: 60vh;
    }

    .scatter-img {
        width: 140px;
        max-width: 42vw;
        border-width: 3px;
    }

    /* --- Join us --- */
    #join_us_section .content {
        width: 100%;
    }

    .join-content-wrapper {
        flex-direction: column;
        gap: 32px;
    }

    .join-right {
        min-height: 200px;
        width: 100%;
    }

    .join-puzzle {
        width: 100px;
    }

    .main-join-logo {
        max-width: 180px;
    }

    /* --- Back to top --- */
    #goBackTOP {
        bottom: 16px;
        right: 16px;
        width: 44px;
    }

    /* --- Footer --- */
    footer .row {
        width: 90vw;
        flex-direction: column;
        align-items: flex-start;
        gap: 16px;
    }

    footer .column-2:last-child {
        justify-content: flex-start;
    }

    footer img {
        width: 100px;
    }
}

/* ===========================
   Phone (≤ 576px)
   =========================== */
@media (max-width: 576px) {
    .content h2 {
        font-size: clamp(24px, 8vw, 34px);
    }

    .content p {
        font-size: 15px;
    }

    .filter-tags {
        gap: 8px;
    }

    .filter-btn {
        padding: 6px 12px;
        font-size: 12px;
    }

    #searchInput {
        font-size: 15px;
        padding: 10px 12px;
    }

    .accordion-header {
        font-size: 15px;
        padding-top: 0.85em;
        padding-bottom: 0.85em;
    }

    .students-photo {
        justify-content: center;
    }

    .students-bio {
        width: calc(50% - 8px);
        min-width: 100px;
    }

    .gallery-item {
        width: 100%;
    }

    .gallery-wrap.collapsed {
        max-height: 340px;
    }

    /* Hide extra scatter images on small screens */
    .scatter-img:nth-child(n+7) {
        display: none;
    }

    .scatter-img {
        width: 110px;
        max-width: 38vw;
    }

    /* Hide decorative puzzles on small phones */
    .puzzle:not(.p-center-bg) {
        display: none;
    }

    .leader-card {
        flex-direction: column;
        align-items: center;
        text-align: center;
    }

    .leader-img {
        width: 60%;
        max-width: 200px;
        margin-right: 0;
        margin-bottom: 12px;
    }

    .checkbox-wrapper {
        align-items: flex-start;
    }

    .checkbox-wrapper label {
        font-size: 0.95rem;
        line-height: 1.4;
    }
}

/* ===========================
   Hamburger button (hidden on desktop)
   =========================== */
.nav-toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 5px;
    width: 44px;
    height: 44px;
    padding: 0;
    border: none;
    background: transparent;
    cursor: pointer;
    z-index: 1001;
}

.nav-toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--color-primary);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

.navbar.menu-open .nav-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.navbar.menu-open .nav-toggle-bar:nth-child(2) {
    opacity: 0;
}

.navbar.menu-open .nav-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}