/* =============================================
   Responsive CSS - Mobile First
   ============================================= */

/* ---- Mobile (default, up to 767px) ---- */

.hamburger {
    display: flex;
}

.nav {
    position: fixed;
    top: 0;
    right: -100%;
    width: 80%;
    max-width: 320px;
    height: 100vh;
    background-color: var(--white);
    box-shadow: var(--shadow-lg);
    transition: right 0.35s ease-in-out;
    z-index: 1000;
    padding: 110px 30px 40px;
    overflow-y: auto;
}

.nav.open {
    right: 0;
}

.nav-list {
    flex-direction: column;
    gap: 4px;
}

.nav-link {
    display: block;
    padding: 14px 16px;
    font-size: 1.0625rem;
    border-radius: var(--radius-sm);
}

/* Mobile dropdown — inline expansion */
.nav-toggle {
    width: 100%;
    justify-content: space-between;
    text-align: right;
    padding: 14px 16px;
    font-size: 1.0625rem;
    border-radius: var(--radius-sm);
}

.nav-submenu {
    position: static;
    opacity: 1;
    visibility: visible;
    transform: none;
    box-shadow: none;
    border: 0;
    background: transparent;
    padding: 0;
    margin: 0 12px 0 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.25s ease;
    min-width: 0;
}

.nav-item.has-dropdown.open .nav-submenu {
    max-height: 220px;
}

.nav-sublink {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

/* Mobile hero image framing */
.hero-bg {
    object-position: center 50%;
}

/* Mobile: logo on left, hamburger on right (RTL) */
.header-inner {
    flex-direction: row-reverse;
}

.logo-img {
    height: 55px;
}

.home {
    --header-height: 100px;
}

.home .logo-img {
    height: 83px;
}

.home .nav-link,
.home .nav-toggle {
    font-size: 1.375rem;
}

.home .nav-sublink {
    font-size: 1.25rem;
}

/* Mobile overlay */
.nav-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 999;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

.nav-overlay.active {
    opacity: 1;
    visibility: visible;
}

/* Mobile hero buttons */
.hero-buttons {
    flex-direction: column;
    gap: 12px;
}

/* Mobile marquee */
:root {
    --mq-w: 280px;
    --mq-h: 210px;
    --mq-gap: 12px;
    --mq-speed: 35s;
}

/* Mobile lightbox */
.lightbox-close {
    top: 12px;
    left: 12px;
    width: 48px;
    height: 48px;
    font-size: 1.5rem;
}

.lightbox-prev,
.lightbox-next {
    width: 44px;
    height: 44px;
    font-size: 1.25rem;
}

.lightbox-prev {
    right: 8px;
}

.lightbox-next {
    left: 8px;
}

/* ---- Tablet (768px - 1023px) ---- */
@media (min-width: 768px) {
    h1 { font-size: 2.5rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.75rem; }

    .container {
        padding: 0 32px;
    }

    .section {
        padding: 80px 0;
    }

    .section-title {
        font-size: 2.25rem;
        margin-bottom: 56px;
    }

    .logo-img {
        height: 65px;
    }

    .home {
        --header-height: 118px;
    }

    .home .logo-img {
        height: 98px;
    }

    .home .nav-link,
    .home .nav-toggle {
        font-size: 1.125rem;
    }

    .home .nav-sublink {
        font-size: 1.0625rem;
    }

    /* Hero */
    .hero-bg {
        object-position: center 55%;
    }

    .hero {
        min-height: 85vh;
    }

    .hero-title {
        font-size: 3rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-buttons {
        flex-direction: row;
        justify-content: center;
        gap: 20px;
    }

    /* Page Hero - tablet */
    .page-hero-title {
        font-size: 2.75rem;
    }

    .page-hero-subtitle {
        font-size: 1.25rem;
    }

    /* Goals */
    .goals-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
    }

    .goals-grid .goal-card:last-child {
        grid-column: 1 / -1;
        max-width: 50%;
        margin: 0 auto;
    }

    /* Activities */
    .activities-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 28px;
    }

    /* Contact - tablet */
    .contact-grid {
        grid-template-columns: repeat(3, 1fr);
    }

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

    /* Founders - tablet */
    .founders-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Governance - tablet */
    .governance-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Conference - tablet */
    .conference-details {
        grid-template-columns: 1.2fr 1fr;
    }

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

    /* Kenes 2 - tablet */
    .committee-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 10px 16px;
        padding: 28px;
    }

    .save-the-date {
        padding: 36px 32px;
        gap: 10px;
    }

    .save-the-date-label {
        font-size: 1.5rem;
    }

    .save-the-date-dates {
        font-size: 2.5rem;
    }

    /* Gallery grid - tablet */
    .gallery-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 16px;
    }

    /* Publications - tablet */
    .publications-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Events - tablet */
    .events-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    /* Timeline - tablet */
    .timeline {
        padding-right: 50px;
    }

    /* Marquee - tablet */
    :root {
        --mq-w: 400px;
        --mq-h: 300px;
        --mq-gap: 16px;
        --mq-speed: 45s;
    }

    /* Lightbox - tablet */
    .lightbox-close {
        top: 16px;
        left: 16px;
        width: 56px;
        height: 56px;
        font-size: 2rem;
    }

    .lightbox-prev,
    .lightbox-next {
        width: 56px;
        height: 56px;
        font-size: 1.75rem;
    }

    .lightbox-prev {
        right: 20px;
    }

    .lightbox-next {
        left: 20px;
    }

    /* Footer */
    .footer-inner {
        grid-template-columns: repeat(2, 1fr);
        gap: 40px;
    }

    /* CTA */
    .cta-title {
        font-size: 2.25rem;
    }
}

/* ---- Desktop (1024px+) ---- */
@media (min-width: 1024px) {
    h1 { font-size: 3rem; }
    h2 { font-size: 2.25rem; }
    h3 { font-size: 1.75rem; }
    body { font-size: 1.125rem; }

    .container {
        padding: 0 40px;
    }

    .section {
        padding: 100px 0;
    }

    .section-title {
        font-size: 2.25rem;
        margin-bottom: 64px;
    }

    /* Header - Desktop Navigation */
    .hamburger {
        display: none;
    }

    .header-inner {
        flex-direction: row;
    }

    .nav {
        position: static;
        width: auto;
        max-width: none;
        height: auto;
        background: none;
        box-shadow: none;
        padding: 0;
        overflow: visible;
    }

    .nav-list {
        flex-direction: row;
        gap: 4px;
    }

    .nav-link {
        padding: 8px 14px;
        font-size: 0.875rem;
    }

    /* Desktop dropdown — restore floating menu */
    .nav-toggle {
        width: auto;
        justify-content: center;
        padding: 8px 14px;
        font-size: 0.875rem;
    }

    .nav-submenu {
        position: absolute;
        top: calc(100% + 8px);
        right: 0;
        min-width: 220px;
        background-color: var(--white);
        border: 1px solid rgba(0, 0, 0, 0.06);
        border-radius: var(--radius-md, 10px);
        box-shadow: 0 12px 32px rgba(0, 0, 0, 0.12);
        padding: 6px;
        margin: 0;
        opacity: 0;
        visibility: hidden;
        transform: translateY(-6px);
        transition: opacity 0.18s ease, transform 0.18s ease, visibility 0.18s;
        max-height: none;
        overflow: visible;
    }

    .nav-item.has-dropdown.open .nav-submenu {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
        max-height: none;
    }

    .nav-sublink {
        padding: 10px 14px;
        font-size: 0.9375rem;
    }

    .logo-img {
        height: 70px;
    }

    .home {
        --header-height: 125px;
    }

    .home .logo-img {
        height: 105px;
    }

    /* Hero */
    .hero-bg {
        object-position: center 60%;
    }

    .hero {
        min-height: 100vh;
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .hero-subtitle {
        font-size: 1.25rem;
    }

    .hero-content {
        padding: 0 20px;
    }

    /* Page Hero - desktop */
    .page-hero-title {
        font-size: 3rem;
    }

    .page-hero-content {
        padding: 80px 20px;
    }

    /* Goals */
    .goals-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    .goals-grid .goal-card:nth-child(4),
    .goals-grid .goal-card:nth-child(5) {
        grid-column: auto;
    }

    .goals-grid .goal-card:last-child {
        grid-column: auto;
        max-width: 100%;
        margin: 0;
    }

    /* Activities */
    .activities-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    /* Founders - desktop */
    .founders-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 32px;
    }

    /* Abstracts - desktop */
    .abstracts-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    /* Gallery grid - desktop */
    .gallery-grid {
        grid-template-columns: repeat(4, 1fr);
        gap: 20px;
    }

    /* Marquee - desktop */
    :root {
        --mq-w: 500px;
        --mq-h: 375px;
        --mq-gap: 20px;
        --mq-speed: 50s;
    }

    /* Lightbox - desktop */
    .lightbox-close {
        top: 24px;
        left: 24px;
        width: 60px;
        height: 60px;
        font-size: 2rem;
    }

    .lightbox-prev,
    .lightbox-next {
        width: 64px;
        height: 64px;
        font-size: 2rem;
    }

    .lightbox-prev {
        right: 32px;
    }

    .lightbox-next {
        left: 32px;
    }

    /* Footer */
    .footer-inner {
        grid-template-columns: 1.5fr 1fr 1.5fr 1fr;
        gap: 48px;
    }

    /* CTA */
    .cta-section {
        padding: 100px 0;
    }

    .cta-title {
        font-size: 2.5rem;
    }
}

/* ---- Large Desktop (1280px+) ---- */
@media (min-width: 1280px) {
    .container {
        padding: 0 60px;
    }

    .hero-title {
        font-size: 4rem;
    }

    .page-hero-title {
        font-size: 3.5rem;
    }

    .logo-img {
        height: 75px;
    }

    .home {
        --header-height: 133px;
    }

    .home .logo-img {
        height: 113px;
    }

    .home .nav-link,
    .home .nav-toggle {
        font-size: 1.25rem;
    }

    .home .nav-sublink {
        font-size: 1.125rem;
    }

    .nav-link {
        padding: 8px 16px;
        font-size: 0.9375rem;
    }

    .nav-toggle {
        padding: 8px 16px;
        font-size: 0.9375rem;
    }

    .goals-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .goals-grid .goal-card:last-child {
        max-width: 100%;
    }

    /* Marquee - large desktop */
    :root {
        --mq-w: 580px;
        --mq-h: 435px;
        --mq-gap: 24px;
        --mq-speed: 55s;
    }
}