/* Proto-OKN Navbar Styles
 * Modern top navbar matching frink.renci.org design
 */

/* ===== Site Navbar ===== */
.site-navbar {
    background: #2f204a;
    position: sticky;
    top: 0;
    z-index: var(--z-index-dropdown, 1000);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.navbar-inner {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    height: 56px;
}

/* ===== Left: Hamburger + Brand ===== */
.navbar-left {
    display: flex;
    align-items: center;
    gap: 16px;
}

.navbar-hamburger {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 4px;
    width: 32px;
    height: 32px;
}

.navbar-hamburger span {
    display: block;
    width: 22px;
    height: 2px;
    background: white;
    border-radius: 1px;
    transition: var(--transition-base, 0.2s ease);
}

.navbar-brand {
    display: flex;
    align-items: center;
    gap: 10px;
    text-decoration: none;
    color: white;
}

.navbar-logo {
    width: 32px;
    height: 32px;
    filter: brightness(0) invert(1);
}

.navbar-brand-text {
    font-size: 18px;
    font-weight: 700;
    color: white;
    letter-spacing: 0.3px;
}

/* ===== Right: Nav Links ===== */
.navbar-links {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.9);
    text-decoration: none;
    font-size: 15px;
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 6px;
    transition: var(--transition-base, 0.2s ease);
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.15);
}

/* ===== Dropdown ===== */
.nav-dropdown {
    position: relative;
}

.nav-dropdown-toggle {
    display: flex;
    align-items: center;
    gap: 4px;
}

.nav-dropdown-toggle::after {
    content: '';
    display: inline-block;
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 4px solid rgba(255, 255, 255, 0.7);
    margin-left: 2px;
    transition: transform 0.2s ease;
}

.nav-dropdown-menu {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    margin-top: 4px;
    background: white;
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.15);
    min-width: 200px;
    padding: 6px 0;
    z-index: 1001;
}

.nav-dropdown:hover .nav-dropdown-menu,
.nav-dropdown:focus-within .nav-dropdown-menu {
    display: block;
}

.nav-dropdown-item {
    display: block;
    padding: 10px 20px;
    color: #333;
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: background 0.15s ease;
}

.nav-dropdown-item:hover {
    background: var(--color-hover-background, #F5F0FA);
    color: var(--color-primary-purple, #6B4C9A);
}

/* ===== Mobile Nav Overlay ===== */
.mobile-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 9998;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.3s ease;
}

.mobile-nav-overlay.visible {
    opacity: 1;
    pointer-events: auto;
}

/* ===== Mobile Nav Drawer ===== */
.mobile-nav-drawer {
    position: fixed;
    top: 0;
    left: 0;
    width: 280px;
    height: 100vh;
    background: white;
    box-shadow: none;
    z-index: 9999;
    transform: translateX(-100%);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    padding: 0;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

.mobile-nav-drawer.open {
    transform: translateX(0);
    box-shadow: 2px 0 12px rgba(0, 0, 0, 0.2);
    padding: 20px;
}

.mobile-nav-close {
    align-self: flex-end;
    background: none;
    border: none;
    font-size: 28px;
    color: #666;
    cursor: pointer;
    padding: 0;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 16px;
    border-radius: 6px;
    transition: background 0.2s ease;
}

.mobile-nav-close:hover {
    background: #F5F0FA;
    color: var(--color-primary-purple, #6B4C9A);
}

.mobile-nav-group {
    margin-bottom: 16px;
}

.mobile-nav-heading {
    display: block;
    font-size: 12px;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.8px;
    color: #999;
    padding: 8px 12px 4px;
}

.mobile-nav-link {
    display: block;
    color: #333;
    text-decoration: none;
    padding: 10px 12px;
    border-radius: 6px;
    font-size: 15px;
    font-weight: 500;
    transition: background 0.15s ease;
}

.mobile-nav-link:hover {
    background: #F5F0FA;
    color: var(--color-primary-purple, #6B4C9A);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .navbar-hamburger {
        display: flex;
    }

    .navbar-links {
        display: none;
    }
}

/* ===== Landing Hero ===== */
.landing-hero {
    text-align: center;
    padding: 48px 24px 40px;
    background: white;
}

.landing-hero .hero-title {
    font-size: 36px;
    font-weight: 700;
    color: #333;
    margin: 0 0 8px;
}

.landing-hero .hero-subtitle {
    font-size: 16px;
    color: #666;
    margin: 0 0 36px;
}

.landing-hero .hero-blurb {
    /* Explanatory paragraph shown BELOW the hero buttons.
       Distinct from .hero-subtitle (the tagline above the buttons). */
    max-width: 640px;
    margin: 72px auto 0;
    font-size: 18px;
    font-weight: 500;
    line-height: 1.55;
    color: #2A2A2A;
    text-align: center;
}

/* ===== Hero Buttons ===== */
.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 24px;
    max-width: 900px;
    margin: 0 auto;
}

.hero-btn {
    flex: 1;
    max-width: 260px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    padding: 28px 24px;
    background: white;
    border: 1px solid #E0E0E0;
    border-radius: 14px;
    text-decoration: none;
    color: inherit;
    transition: box-shadow 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
    cursor: pointer;
}

.hero-btn:hover {
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
    transform: translateY(-3px);
    border-color: #C0C0C0;
}


.hero-btn-icon {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-primary-purple, #6B4C9A);
}

.hero-btn-icon svg {
    width: 32px;
    height: 32px;
}

.hero-btn-label {
    font-size: 16px;
    font-weight: 600;
    line-height: 1.3;
}

.hero-btn-desc {
    font-size: 13px;
    color: #888;
    line-height: 1.4;
    text-align: center;
}

@media (max-width: 700px) {
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

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

    .landing-hero .hero-blurb {
        font-size: 16px;
        margin-top: 48px;
        padding: 0 16px;
    }
}

/* ===== Prose Page (Contribute Compute) ===== */
.prose-page {
    flex: 1 0 auto;
    padding: 48px 24px;
    background: white;
}

.prose-inner {
    max-width: 740px;
    margin: 0 auto;
}

.prose-inner h1 {
    font-size: 32px;
    font-weight: 700;
    color: #333;
    margin: 0 0 20px;
    line-height: 1.3;
}

.prose-inner h2 {
    font-size: 22px;
    font-weight: 600;
    color: #2f204a;
    margin: 32px 0 12px;
    line-height: 1.3;
}

.prose-inner p {
    font-size: 16px;
    color: #444;
    line-height: 1.7;
    margin: 0 0 16px;
}

.prose-lead {
    font-size: 18px !important;
    color: #555 !important;
    font-weight: 500;
    border-left: 4px solid #2f204a;
    padding-left: 16px;
    margin-bottom: 28px !important;
}

.prose-inner h3 {
    font-size: 18px;
    font-weight: 600;
    color: #333;
    margin: 24px 0 8px;
}

.prose-inner ul,
.prose-inner ol {
    padding-left: 24px;
    margin: 0 0 16px;
}

.prose-inner li {
    font-size: 16px;
    color: #444;
    line-height: 1.7;
    margin-bottom: 6px;
}

.config-list {
    margin: 16px 0 24px !important;
}

.config-list > li {
    margin-bottom: 16px;
    font-size: 16px;
    color: #444;
}

.config-list > li > strong {
    color: #2f204a;
    font-size: 17px;
}

.config-list ul {
    margin: 6px 0 0;
    padding-left: 20px;
}

.config-list ul li {
    font-size: 15px;
    margin-bottom: 2px;
    line-height: 1.5;
}

.prose-inner pre {
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
    border-radius: 6px;
    padding: 16px;
    overflow-x: auto;
    margin: 0 0 16px;
}

.prose-inner code {
    font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
    font-size: 14px;
}

.prose-inner p code,
.prose-inner li code,
.prose-inner td code {
    background: #f0eff3;
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 14px;
}

.prose-table {
    width: 100%;
    border-collapse: collapse;
    margin: 0 0 16px;
    font-size: 15px;
}

.prose-table th,
.prose-table td {
    text-align: left;
    padding: 10px 14px;
    border-bottom: 1px solid #e0e0e0;
    color: #444;
}

.prose-table th {
    font-weight: 600;
    color: #2f204a;
    background: #f9f8fb;
}

.prose-updated {
    font-size: 13px !important;
    color: #999 !important;
    margin-top: 40px !important;
    font-style: italic;
}

/* ===== Static Content Sections ===== */

#app {
    flex: 0 0 auto;
}

.static-content {
    flex: 1 0 auto;
    transition: opacity 0.3s ease;
}

.section-cards {
    padding: 40px 24px;
    background: var(--color-background-light, #FAFAFA);
}

.section-use-cases {
    background: white;
}

.section-cards-inner {
    max-width: 1100px;
    margin: 0 auto;
}

.section-cards-header {
    display: flex;
    align-items: baseline;
    justify-content: space-between;
    margin-bottom: 20px;
}

.section-cards-title {
    font-size: 22px;
    font-weight: 700;
    color: #333;
    margin: 0 0 20px;
}

.section-cards-view-all {
    color: var(--color-primary-purple, #6B4C9A);
    text-decoration: none;
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
}

.section-cards-view-all:hover {
    text-decoration: underline;
}

/* Knowledge Graph Cards */
.cards-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
}

/* ---------------------------------------------------------------- */
/* KG carousel                                                        */
/* ---------------------------------------------------------------- */
/* Horizontal scrolling rail of fixed-width cards. The track scrolls
   natively (mouse wheel, trackpad, touch); the left/right arrows
   are progressive enhancement wired up in scripts.js.

   Cards keep their width so 40+ entries don't squeeze together.
   Scroll-snap aligns each card to the start of the viewport when
   the user pages with the arrows or flicks on touch. */

.kg-carousel {
    position: relative;
    /* Padding leaves room for the arrow buttons without overlapping
       card content. */
    padding: 0 44px;
}

.kg-carousel-track {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    overflow-y: hidden;
    scroll-snap-type: x mandatory;
    scroll-behavior: smooth;
    /* Hide native scrollbar — arrows + trackpad gestures replace it.
       Kept for keyboard / accessibility on platforms that always
       show the bar. */
    scrollbar-width: thin;
    -webkit-overflow-scrolling: touch;
}

.kg-carousel-track .kg-card {
    flex: 0 0 280px;          /* fixed width so cards don't shrink */
    scroll-snap-align: start;
}

.kg-carousel-arrow {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    border-radius: 50%;
    border: 1px solid #E0E0E0;
    background: white;
    color: #555;
    font-size: 24px;
    line-height: 1;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
    transition: background 0.15s ease, color 0.15s ease, opacity 0.15s ease;
    z-index: 1;
    /* Slight nudge so the glyph appears centered. */
    padding: 0 0 2px 0;
}

.kg-carousel-arrow.left  { left: 0; }
.kg-carousel-arrow.right { right: 0; }

.kg-carousel-arrow:hover:not([disabled]) {
    background: #f4f4f4;
    color: #222;
}

.kg-carousel-arrow[disabled] {
    opacity: 0.35;
    cursor: default;
}

.kg-card {
    background: white;
    border: 1px solid #E0E0E0;
    border-radius: 10px;
    padding: 20px;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    text-decoration: none;
    color: inherit;
    display: block;
    cursor: pointer;
}

.kg-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    transform: translateY(-2px);
}

.kg-card-header {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-bottom: 8px;
}

.kg-status-dot {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    flex-shrink: 0;
}

.kg-card-name {
    font-size: 16px;
    color: #333;
}

.kg-card-desc {
    font-size: 14px;
    color: #666;
    line-height: 1.5;
    margin: 0 0 12px;
}

.kg-card-tag {
    display: inline-block;
    font-size: 12px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 12px;
    border: none;
}

/* Use Case Cards */
.use-cases-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
}

.use-case-card {
    background: #FAF7F2;
    border-radius: 10px;
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 4px;
    transition: box-shadow 0.2s ease, transform 0.2s ease;
    cursor: pointer;
    text-decoration: none;
    color: inherit;
}

.use-case-card:hover {
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
    transform: translateY(-2px);
}

.use-case-title {
    font-size: 15px;
    font-weight: 600;
    color: var(--color-primary-purple, #6B4C9A);
}

.use-case-desc {
    font-size: 13px;
    color: #555;
    line-height: 1.4;
    margin-top: 2px;
}

.use-case-graphs {
    font-size: 12px;
    color: #999;
    margin-top: 4px;
}

/* ===== Footer ===== */
.site-footer {
    background: #F5F5F5;
    border-top: 1px solid #E0E0E0;
    padding: 20px 24px;
    margin-top: auto;
}

.footer-inner {
    max-width: 1100px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
}

.footer-left {
    flex: 1;
}

.footer-powered {
    font-size: 13px;
    color: #666;
}

.footer-nsf {
    display: flex;
    align-items: center;
    gap: 10px;
    flex-shrink: 0;
}

.nsf-logo {
    height: 40px;
    width: auto;
}

.nsf-award {
    font-size: 12px;
    color: #666;
    white-space: nowrap;
}

.footer-links {
    display: flex;
    gap: 20px;
    flex-shrink: 0;
}

.footer-link {
    font-size: 13px;
    color: #333;
    text-decoration: none;
    font-weight: 500;
    transition: color 0.15s ease;
}

.footer-link:hover {
    color: var(--color-primary-purple, #6B4C9A);
}

.footer-link-inline {
    color: #333;
    font-weight: 500;
    text-decoration: underline;
}

.footer-link-inline:hover {
    color: var(--color-primary-purple, #6B4C9A);
}

/* ===== Responsive Cards ===== */
@media (max-width: 900px) {
    .cards-grid {
        grid-template-columns: repeat(2, 1fr);
    }

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

@media (max-width: 600px) {
    .cards-grid {
        grid-template-columns: 1fr;
    }

    .use-cases-grid {
        grid-template-columns: 1fr;
    }

    .footer-inner {
        flex-direction: column;
        gap: 16px;
        text-align: center;
    }

    .footer-left {
        flex: none;
    }
}