@import "surfaces.css";

/* =============================================================================
   HEADER / NAV THEMING
   The header participates in the surface system via data-surface.
   Unscrolled: solid surface color.
   Scrolled:   frosted glass tinted by the surface's --bg color.

   Always set data-surface on #site-header so link colors are correct.
   Example: <header id="site-header" data-surface="tone-pure">
   ============================================================================= */

/* --- THEMING --- */

#site-header {
    position: sticky;
    top: 0;
    z-index: 50;
}

/* [data-surface] applies background-color: var(--bg) and provides --link, --link-hover, --link-hover-bg */

#site-header[data-surface] {
    backdrop-filter: blur(5px);
    -webkit-backdrop-filter: blur(5px);
    transition: background-color 0.3s ease;
}

/* On scroll: frosted glass (reduce background opacity) */
#site-header[data-surface].scrolled,
[data-nav-scrolled] #site-header[data-surface] {
    background-color: color-mix(in srgb, var(--bg) 50%, transparent);
}

.nav-topbar {
    border-color: var(--border);
    max-height: 100px;
    overflow: hidden;
    transition: max-height 0.3s ease;
}

#site-header.scrolled .nav-topbar {
    max-height: 0;
}

#site-header .nav-link {
    color: var(--link);
}

#site-header .nav-link:hover {
    color: var(--link-hover);
    background-color: var(--link-hover-bg);
}

#site-header .nav-dropdown {
    background-color: var(--bg);
    border-color: var(--border);
}

#site-header .nav-dropdown-link {
    color: var(--link);
}

#site-header .nav-dropdown-link:hover {
    color: var(--link-hover);
    background-color: var(--link-hover-bg);
}

#site-header .nav-logo {
    color: var(--link-hover);
}

#site-header .nav-menu {
    background-color: var(--bg);
    border-color: var(--border);
}

@media (min-width: 1200px) {
    #site-header .nav-menu {
        background-color: transparent;
        border-color: transparent;
    }
}

/* --- LAYOUT --- */

/* Topbar: hidden on mobile, visible on md+ */
.nav-topbar {
    display: none;
}

@media (min-width: 768px) {
    .nav-topbar {
        display: block;
    }
}

.nav-topbar-links {
    display: flex;
    justify-content: flex-end;
    align-items: center;
    gap: 1.5rem;
    padding: 0.5rem 1rem;
    border-bottom: 1px solid var(--border);
}

/* Main bar */
.nav-bar {
    display: flex;
    align-items: center;
    padding: 0.5rem 1rem;
}

.nav-logo {
    flex-shrink: 0;
}

/* PNG logo: theme switching */
[data-theme="light"] .nav-logo .logo-dark {
    display: none;
}

[data-theme="dark"] .nav-logo .logo-light {
    display: none;
}

/* SVG logo: hide when PNG logos are present */
.nav-logo:has(.logo-light) svg {
    display: none;
}

/* Nav link base */
.nav-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 1.2rem;
    transition: color 0.2s, background-color 0.2s;
}

.nav-topbar .nav-link {
    font-size: 1rem;
    padding: 0.5rem 0.5;
}

/* Mobile controls: visible on < lg */
.nav-mobile-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 1rem;
}

@media (min-width: 1200px) {
    .nav-mobile-controls {
        display: none;
    }
}

/* Burger */
.burger-btn {
    border: none;
    background: transparent;
    padding: 0;
    cursor: pointer;
}

.burger-grid {
    display: grid;
    grid-template-columns: repeat(3, 6px);
    grid-template-rows: repeat(3, 6px);
    gap: 4px;
}

/* Nav menu: hidden on mobile until .open, always visible on xl+ */
.nav-menu {
    display: none;
    flex-direction: column;
}

.nav-menu.open {
    display: flex;
}

@media (min-width: 1200px) {
    .nav-menu {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 0.5rem;
        flex: 1;
    }
}

/* Mobile panel: positioned below header */
#navMenu {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    padding: 1rem;
    border-top: 1px solid var(--border);
}

@media (min-width: 1200px) {
    #navMenu {
        position: static;
        top: auto;
        left: auto;
        right: auto;
        padding: 0;
        border-top: none;
    }
}

/* Nav links list */
.nav-links {
    list-style: none;
    margin: 0;
    padding: 0;
}

@media (min-width: 1200px) {
    .nav-links {
        display: flex;
        flex-direction: row;
        align-items: center;
        gap: 0.25rem;
        margin: 0 auto;
    }
}

/* Dropdown items */
.nav-item {
    position: relative;
}

/* Mobile: accordion */
.nav-dropdown {
    list-style: none;
    margin: 0;
    padding: 0;
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
}

.nav-item.open .nav-dropdown {
    max-height: 500px;
    padding: 0.25rem 0 0.25rem 1rem;
}

/* Desktop: floating dropdown */
@media (min-width: 1200px) {
    .nav-dropdown {
        padding: 0.5rem;
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 280px;
        border-radius: 0.5rem;
        border: 1px solid var(--border);
        box-shadow: 0 10px 25px rgb(0 0 0 / 0.15);
        z-index: 50;
        max-height: none;
        overflow: visible;
        visibility: hidden;
        opacity: 0;
        transform: translateY(-4px);
        transition: opacity 0.2s, transform 0.2s, visibility 0.2s;
    }

    .nav-item.open .nav-dropdown {
        max-height: none;
        padding: 0.5rem;
    }
}

/* Desktop dropdown open states: hover + click */
@media (min-width: 1200px) {

    [data-dropdown="hover"] .nav-item:hover .nav-dropdown,
    .nav-item.open .nav-dropdown {
        visibility: visible;
        opacity: 1;
        transform: translateY(0);
    }
}

/* Chevron indicator on nav links that have a dropdown */
.nav-item>.nav-link::after {
    content: '';
    display: inline-block;
    width: 0.4em;
    height: 0.4em;
    border-right: 2px solid currentColor;
    border-bottom: 2px solid currentColor;
    transform: rotate(45deg);
    margin-left: 0.4em;
    vertical-align: middle;
    transition: transform 0.2s;
}

/* Rotate when open (click mode, or hover mode on mobile) */
.nav-item.open>.nav-link::after {
    transform: rotate(-45deg);
}

/* Rotate on hover (hover mode, desktop) */
[data-dropdown="hover"] .nav-item:hover>.nav-link::after {
    transform: rotate(-45deg);
}

.nav-dropdown-link {
    display: block;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
    font-size: 1.2rem;
    transition: color 0.2s, background-color 0.2s;
}

/* Search: desktop only */
.nav-search {
    display: none;
    position: relative;
    margin-right: 0.5rem;
}

@media (min-width: 768px) {
    .nav-search {
        display: block;
    }
}


.search-toggle-btn {
    background: transparent;
    border: none;
    padding: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
}

/* Mobile-only nav items */
@media (min-width: 1200px) {
    .nav-mobile-only {
        display: none !important;
    }
}

/* CTA buttons */
.nav-cta {
    display: flex;
    gap: 0.5rem;
    flex-shrink: 0;
    align-items: center;
    margin-left: auto;
}

/* Desktop-only items within nav-cta */
.nav-desktop-only {
    display: none !important;
}

@media (min-width: 1200px) {
    .nav-desktop-only {
        display: inline-flex !important;
    }
}

/* Burger dots */
.burger-dot {
    display: block;
    width: 0.375rem;
    height: 0.375rem;
    border-radius: 9999px;
    background-color: var(--text);
}

/* Search bar */
.search-bar {
    position: absolute;
    right: 2.5rem;
    top: 50%;
    transform: translateY(-50%);
    display: flex;
    align-items: center;
    width: 0;
    opacity: 0;
    overflow: hidden;
    transition: width 0.5s ease-out, opacity 0.5s ease-out;
    background-color: var(--surface-neutral-bg);
    border-radius: 9999px;
    height: 40px;
    z-index: 10;
}

.search-bar.active {
    width: 300px;
    opacity: 1;
}

.search-bar input {
    background: transparent;
    border: none;
    color: var(--surface-neutral-text);
    padding: 8px 45px 8px 20px;
    width: 100%;
    font-size: 14px;
    outline: none;
}

.search-bar input::placeholder {
    color: var(--link);
}

.search-bar-btn {
    position: absolute;
    right: 8px;
    background: none;
    border: none;
    cursor: pointer;
    color: var(--link);
    padding: 0;
    display: flex;
    align-items: center;
}

.search-bar-btn:hover {
    color: var(--link-hover);
}