/* =========================================================
   DESIGN TOKENS
========================================================= */

:root {
    --color-bg: #1e1e1e;
    --color-surface: #242424;
    --color-surface-raised: #292929;
    --color-surface-hover: #303030;
    --color-border: #3a3a3a;
    --color-border-strong: #171717;
    --color-text: #eeeeee;
    --color-text-muted: #aaaaaa;
    --color-accent: #0092ed;

    --nav-height: 52px;
    --content-width: 1220px;
    --radius: 3px;
    --shadow: 0 18px 42px rgb(0 0 0 / 28%);

    --duration-fast: 140ms;
    --duration-medium: 220ms;
}

/* =========================================================
   RESET / BASE
========================================================= */

*,
*::before,
*::after {
    box-sizing: border-box;
}

html,
body {
    width: 100%;
    height: 100%;
    margin: 0;
    overflow: hidden;
}

html {
    background: var(--color-bg);
}

body {
    font-family: "Montserrat", system-ui, sans-serif;
    font-size: 14px;
    line-height: 1.5;
    color: var(--color-text);
    background: var(--color-bg);
    font-synthesis: none;
}

button,
a {
    font: inherit;
}

button {
    color: inherit;
}

ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

a {
    color: inherit;
}

[hidden] {
    display: none !important;
}

/* =========================================================
   PAGE
========================================================= */

main {
    display: grid;
    height: calc(100dvh - var(--nav-height));
    place-items: center;
    padding: 32px;
    overflow: hidden;
}

main h1 {
    margin: 0;
    font-size: clamp(3rem, 9vw, 7rem);
    font-weight: 500;
    letter-spacing: -0.05em;
    color: #242424;
    user-select: none;
}

/* =========================================================
   NAVIGATION
========================================================= */

nav {
    position: relative;
    z-index: 100;
    height: var(--nav-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border-strong);
}

.mobile-nav {
    display: none;
}

/* =========================================================
   DESKTOP NAVIGATION
========================================================= */

.desktop-nav {
    width: min(100%, var(--content-width));
    height: 100%;
    margin: 0 auto;
}

.desktop-nav-list {
    display: flex;
    height: 100%;
    margin: 0;
    padding: 0;
    list-style: none;
}

.desktop-nav-item {
    flex: 0 0 auto;
}

.desktop-nav-trigger {
    height: 100%;
    padding: 0 18px;
    border: 0;
    border-bottom: 2px solid transparent;
    background: transparent;
    color: #d8d8d8;
    cursor: pointer;
    white-space: nowrap;
    transition:
        color var(--duration-fast) ease,
        background-color var(--duration-fast) ease,
        border-color var(--duration-fast) ease;
}

.desktop-nav-trigger:hover,
.desktop-nav-trigger:focus-visible,
.desktop-nav-item.is-open > .desktop-nav-trigger {
    color: var(--color-accent);
    background: var(--color-surface-raised);
}

.desktop-nav-item.is-open > .desktop-nav-trigger {
    border-bottom-color: var(--color-accent);
}

.desktop-submenu {
    position: fixed;
    top: calc(var(--nav-height) + 14px);
    left: 50%;
    z-index: 120;
    width: min(calc(100vw - 32px), var(--content-width));
    max-height: calc(100dvh - var(--nav-height) - 30px);
    overflow: auto;
    padding: 18px 20px;
    border: 1px solid var(--color-border);
    border-top: 2px solid var(--color-accent);
    border-radius: var(--radius);
    background: var(--color-surface-raised);
    box-shadow: var(--shadow);

    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translate(-50%, -8px);

    transition:
        opacity var(--duration-medium) ease,
        transform var(--duration-medium) ease,
        visibility 0s linear var(--duration-medium);
}

.desktop-nav-item.is-open > .desktop-submenu {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate(-50%, 0);
    transition:
        opacity var(--duration-medium) ease,
        transform var(--duration-medium) ease,
        visibility 0s linear 0s;
}

/* =========================================================
   SHARED LINK CONTENT
========================================================= */

.submenu-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
}

.submenu-section {
    min-width: 0;
    padding: 0 20px;
    border-left: 1px solid var(--color-border);
}

.submenu-section:first-child {
    padding-left: 8px;
    border-left: 0;
}

.submenu-section:last-child {
    padding-right: 8px;
}

.submenu-heading {
    margin: 0 0 8px;
    color: var(--color-accent);
    font-size: 0.75rem;
    font-weight: 600;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

.submenu-links {
    display: grid;
    gap: 2px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.submenu-links a {
    display: flex;
    align-items: center;
    gap: 10px;
    min-height: 38px;
    padding: 7px 8px;
    overflow: hidden;
    text-decoration: none;
    color: var(--color-text);
    transition: background-color var(--duration-fast) ease;
}

.submenu-links a:hover,
.submenu-links a:focus-visible {
    background: var(--color-surface-hover);
}

.submenu-links a span {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.link-icon {
    width: 18px;
    height: 18px;
    flex: 0 0 18px;
    object-fit: contain;
}

.desktop-submenu,
.mobile-nav-panel {
    scrollbar-width: none;
}

.desktop-submenu::-webkit-scrollbar,
.mobile-nav-panel::-webkit-scrollbar {
    display: none;
}

/* =========================================================
   MOBILE / TABLET
========================================================= */

@media (max-width: 960px) {
    :root {
        --nav-height: 50px;
    }

    .desktop-nav {
        display: none;
    }

    .mobile-nav {
        display: block;
        width: 100%;
        height: 100%;
    }

    .mobile-nav-header {
        display: grid;
        grid-template-columns: 50px 1fr 50px;
        align-items: center;
        height: var(--nav-height);
        background: var(--color-surface);
    }

    .mobile-nav-title {
        text-align: center;
        font-weight: 500;
    }

    .mobile-nav-toggle {
        position: relative;
        display: grid;
        width: 50px;
        height: 50px;
        place-items: center;
        padding: 0;
        border: 0;
        background: transparent;
        cursor: pointer;
    }

    .mobile-nav-toggle span,
    .mobile-nav-toggle::before,
    .mobile-nav-toggle::after {
        position: absolute;
        width: 18px;
        height: 1px;
        background: currentColor;
        content: "";
        transition:
            transform var(--duration-fast) ease,
            opacity var(--duration-fast) ease;
    }

    .mobile-nav-toggle::before {
        transform: translateY(-6px);
    }

    .mobile-nav-toggle::after {
        transform: translateY(6px);
    }

    .mobile-nav.is-open .mobile-nav-toggle span {
        opacity: 0;
    }

    .mobile-nav.is-open .mobile-nav-toggle::before {
        transform: rotate(45deg);
    }

    .mobile-nav.is-open .mobile-nav-toggle::after {
        transform: rotate(-45deg);
    }

    .mobile-nav-panel {
        position: fixed;
        inset: var(--nav-height) 0 0;
        z-index: 180;
        width: 100%;
        height: calc(100dvh - var(--nav-height));
        overflow: auto;
        background: var(--color-surface);

        opacity: 0;
        visibility: hidden;
        pointer-events: none;

        transition:
            opacity var(--duration-medium) ease,
            visibility 0s linear var(--duration-medium);
    }

    .mobile-nav.is-open .mobile-nav-panel {
        opacity: 1;
        visibility: visible;
        pointer-events: auto;
        transition:
            opacity var(--duration-medium) ease,
            visibility 0s linear 0s;
    }

    .mobile-category-list {
        margin: 0;
        padding: 0;
        list-style: none;
    }

    .mobile-category-trigger {
        position: relative;
        width: 100%;
        min-height: 58px;
        padding: 0 48px 0 20px;
        border: 0;
        border-bottom: 1px solid var(--color-border);
        background: transparent;
        color: var(--color-text);
        text-align: left;
        cursor: pointer;
    }

    .mobile-category-trigger::after {
        content: "›";
        position: absolute;
        right: 20px;
        top: 50%;
        color: var(--color-text-muted);
        font-size: 1.35rem;
        line-height: 1;
        transform: translateY(-50%);
    }

    .mobile-category-trigger:hover,
    .mobile-category-trigger:focus-visible {
        background: var(--color-surface-hover);
    }

    .mobile-group {
        min-height: 100%;
        background: var(--color-bg);
    }

    .mobile-group-header {
        position: sticky;
        top: 0;
        z-index: 2;
        display: grid;
        grid-template-columns: 52px 1fr 52px;
        align-items: center;
        height: 54px;
        background: var(--color-surface);
        border-bottom: 1px solid var(--color-border);
    }

    .mobile-group-back {
        display: grid;
        width: 52px;
        height: 54px;
        place-items: center;
        padding: 0;
        border: 0;
        background: transparent;
        color: var(--color-text);
        cursor: pointer;
        font-size: 1.35rem;
    }

    .mobile-group-title {
        text-align: center;
        font-weight: 500;
    }

    .mobile-group .submenu-grid {
        display: block;
        padding: 8px 0 24px;
    }

    .mobile-group .submenu-section {
        padding: 16px 20px 10px;
        border: 0;
        border-top: 1px solid var(--color-border);
    }

    .mobile-group .submenu-section:first-child {
        border-top: 0;
    }

    .mobile-group .submenu-links a {
        min-height: 46px;
        padding: 9px 4px;
    }

    .mobile-group .link-icon {
        width: 20px;
        height: 20px;
        flex-basis: 20px;
    }

    main {
        height: calc(100dvh - var(--nav-height));
        padding: 24px;
    }
}

@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}