/* ============================================================
   IChem — shared site navigation
   ------------------------------------------------------------
   Every selector is namespaced with .ic- so this file can be
   dropped onto any page without colliding with that page's own
   rules.
   ============================================================ */

:root {
    --ic-nav-h: 64px;
}

.ic-nav {
    position: sticky;
    top: 0;
    z-index: 1000;
    height: var(--ic-nav-h);
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.ic-nav * {
    box-sizing: border-box;
}

.ic-nav-inner {
    max-width: 1100px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 20px;
    height: 100%;
}

.ic-nav-brand {
    display: flex;
    align-items: center;
    gap: 9px;
    text-decoration: none;
    flex-shrink: 0;
    font-size: 1.35rem;
    font-weight: 800;
    letter-spacing: -0.3px;
    color: var(--text-heading, #0f172a);
}

.ic-nav-brand-mark {
    width: 14px;
    height: 14px;
    border-radius: 4px;
    background: linear-gradient(135deg, var(--primary, #2563eb), var(--secondary, #0d9488));
    flex-shrink: 0;
}

.ic-nav-links {
    display: flex;
    align-items: center;
    gap: 4px;
    list-style: none;
    margin: 0;
    padding: 0;
}

.ic-nav-item {
    position: relative;
    display: flex;
    align-items: center;
}

.ic-nav-link {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 8px 12px;
    border-radius: 7px;
    font-size: 0.95rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-muted, #64748b);
    text-decoration: none;
    background: none;
    border: none;
    cursor: pointer;
    white-space: nowrap;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.ic-nav-link:hover,
.ic-nav-link:focus-visible {
    color: var(--primary, #2563eb);
    background: var(--primary-soft, #eff6ff);
}

.ic-nav-link.is-active {
    color: var(--primary, #2563eb);
    font-weight: 600;
}

.ic-nav-link:focus-visible,
.ic-nav-brand:focus-visible,
.ic-nav-toggle:focus-visible,
.ic-nav-menu-link:focus-visible {
    outline: 2px solid var(--primary, #2563eb);
    outline-offset: 2px;
}

/* Dropdowns -------------------------------------------------------- */

/* A quiet chevron drawn in SVG: it reads as an affordance rather than
   competing with the label. Rotates 180deg when the menu opens. */
.ic-nav-caret {
    width: 14px;
    height: 14px;
    flex-shrink: 0;
    stroke: currentColor;
    stroke-width: 2;
    stroke-linecap: round;
    stroke-linejoin: round;
    fill: none;
    opacity: 0.65;
    transition: transform 0.25s ease, opacity 0.2s ease;
}

.ic-nav-link:hover .ic-nav-caret,
.ic-nav-item.is-open .ic-nav-caret {
    opacity: 1;
}

.ic-nav-item.is-open .ic-nav-caret {
    transform: rotate(180deg);
}

.ic-nav-menu {
    position: absolute;
    top: calc(100% + 10px);
    left: 50%;
    transform: translateX(-50%) translateY(-6px);
    min-width: 272px;
    margin: 0;
    padding: 7px;
    list-style: none;
    background: var(--bg-card, #ffffff);
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 12px;
    box-shadow: 0 12px 28px rgba(15, 23, 42, 0.12), 0 3px 8px rgba(15, 23, 42, 0.06);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s ease, transform 0.2s ease, visibility 0.2s;
}

/* Bridges the gap between the trigger and the panel so the pointer can
   travel down without the menu closing underneath it. */
.ic-nav-menu::before {
    content: "";
    position: absolute;
    top: -10px;
    left: 0;
    right: 0;
    height: 10px;
}

.ic-nav-item.is-open > .ic-nav-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(0);
}

.ic-nav-menu-link {
    display: block;
    padding: 10px 13px;
    border-radius: 8px;
    text-decoration: none;
    color: var(--text-main, #1e293b);
    transition: background-color 0.15s ease;
}

.ic-nav-menu-link strong {
    display: block;
    font-size: 0.92rem;
    font-weight: 600;
    color: var(--text-heading, #0f172a);
}

.ic-nav-menu-link span {
    display: block;
    margin-top: 2px;
    font-size: 0.82rem;
    color: var(--text-muted, #64748b);
    line-height: 1.45;
}

.ic-nav-menu-link:hover,
.ic-nav-menu-link:focus-visible {
    background: var(--primary-soft, #eff6ff);
}

.ic-nav-menu-link:hover strong,
.ic-nav-menu-link:focus-visible strong {
    color: var(--primary, #2563eb);
}

/* On real pointer devices the menu also opens on hover. */
@media (hover: hover) and (min-width: 1041px) {
    .ic-nav-item:hover > .ic-nav-menu,
    .ic-nav-item:focus-within > .ic-nav-menu {
        opacity: 1;
        visibility: visible;
        transform: translateX(-50%) translateY(0);
    }

    .ic-nav-item:hover > .ic-nav-link > .ic-nav-caret,
    .ic-nav-item:focus-within > .ic-nav-link > .ic-nav-caret {
        transform: rotate(180deg);
        opacity: 1;
    }
}

/* Mobile toggle ---------------------------------------------------- */

.ic-nav-toggle {
    display: none;
    width: 40px;
    height: 40px;
    padding: 0;
    background: none;
    border: 1px solid var(--border-color, #e2e8f0);
    border-radius: 8px;
    cursor: pointer;
    position: relative;
}

.ic-nav-toggle span,
.ic-nav-toggle span::before,
.ic-nav-toggle span::after {
    content: "";
    position: absolute;
    left: 50%;
    width: 17px;
    height: 2px;
    margin-left: -8.5px;
    background: var(--text-main, #1e293b);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.2s ease;
}

.ic-nav-toggle span {
    top: 50%;
    margin-top: -1px;
}

.ic-nav-toggle span::before {
    margin-left: 0;
    left: 0;
    top: -6px;
}

.ic-nav-toggle span::after {
    margin-left: 0;
    left: 0;
    top: 6px;
}

.ic-nav-toggle[aria-expanded="true"] span {
    background: transparent;
}

.ic-nav-toggle[aria-expanded="true"] span::before {
    transform: translateY(6px) rotate(45deg);
}

.ic-nav-toggle[aria-expanded="true"] span::after {
    transform: translateY(-6px) rotate(-45deg);
}

@media (max-width: 1040px) {
    .ic-nav-toggle {
        display: block;
    }

    .ic-nav-links {
        position: absolute;
        top: var(--ic-nav-h);
        left: 0;
        width: 100%;
        max-height: calc(100vh - var(--ic-nav-h));
        overflow-y: auto;
        flex-direction: column;
        align-items: stretch;
        gap: 0;
        padding: 10px 24px 18px;
        background: var(--bg-card, #ffffff);
        border-bottom: 1px solid var(--border-color, #e2e8f0);
        box-shadow: var(--shadow-lg, 0 10px 15px -3px rgba(0, 0, 0, 0.08));
        display: none;
    }

    .ic-nav-links.is-open {
        display: flex;
    }

    .ic-nav-item {
        display: block;
    }

    .ic-nav-link {
        width: 100%;
        justify-content: space-between;
        padding: 13px 6px;
        border-radius: 0;
        border-bottom: 1px solid var(--border-color, #e2e8f0);
    }

    .ic-nav-link:hover,
    .ic-nav-link:focus-visible {
        background: none;
    }

    .ic-nav-menu {
        position: static;
        transform: none;
        min-width: 0;
        margin: 2px 0 8px;
        padding: 4px;
        background: var(--bg-body, #f8fafc);
        border-color: var(--border-color, #e2e8f0);
        box-shadow: none;
        display: none;
        opacity: 1;
        visibility: visible;
    }

    .ic-nav-item.is-open > .ic-nav-menu {
        display: block;
        transform: none;
    }
}

@media (prefers-reduced-motion: reduce) {
    .ic-nav,
    .ic-nav *,
    .ic-nav *::before,
    .ic-nav *::after {
        transition-duration: 0.01ms !important;
    }
}

/* ============================================================
   No-JavaScript fallback
   The bar above is injected by ichem-nav.js. When scripting is
   unavailable this plain row of links takes its place so no page
   is ever a dead end.
   ============================================================ */

.ic-nav-fallback {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 6px 20px;
    padding: 16px 24px;
    background: var(--bg-card, #ffffff);
    border-bottom: 1px solid var(--border-color, #e2e8f0);
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}

.ic-nav-fallback a {
    color: var(--primary, #2563eb);
    font-weight: 500;
    font-size: 0.95rem;
    text-decoration: none;
}

.ic-nav-fallback a:hover {
    text-decoration: underline;
}