/* Header, navigation, dropdowns, footer */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow);
}

.site-header .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    height: 64px;
}

/* Wordmark */
.wordmark {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    text-decoration: none;
    flex-shrink: 0;
}

.wordmark-badge {
    display: block;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    flex-shrink: 0;
}

.wordmark-text {
    display: flex;
    flex-direction: column;
    line-height: 1.15;
}

.wordmark-text .ko {
    font-weight: 700;
    color: var(--color-primary);
    font-size: 1rem;
}

.wordmark-text .en {
    font-size: 0.72rem;
    color: var(--color-text-muted);
    letter-spacing: 0.02em;
}

/* Nav */
.nav-toggle {
    display: none;
    background: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    width: 40px;
    height: 40px;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    flex-shrink: 0;
}

.nav-toggle svg { width: 20px; height: 20px; }

.main-nav {
    display: flex;
}

.main-nav > ul {
    display: flex;
    align-items: stretch;
    list-style: none;
    margin: 0;
    padding: 0;
    gap: var(--space-1);
}

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

.main-nav .nav-item > a {
    display: flex;
    flex-direction: column;
    align-items: center;
    line-height: 1.25;
    text-align: center;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.92rem;
    white-space: nowrap;
    transition: background-color 0.2s, color 0.2s;
}

.main-nav .nav-item > a .en {
    font-size: 0.68rem;
    color: var(--color-text-muted);
}

.main-nav .nav-item > a:hover,
.main-nav .nav-item > a:focus-visible,
.main-nav .nav-item.is-active > a {
    background-color: var(--color-primary);
    color: #fff;
}

.main-nav .nav-item > a:hover .en,
.main-nav .nav-item > a:focus-visible .en,
.main-nav .nav-item.is-active > a .en {
    color: #ffe9d1;
}

.submenu-toggle {
    display: none;
}

.submenu {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 220px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: var(--space-1);
    list-style: none;
    margin: var(--space-1) 0 0;
    z-index: 10;
}

.nav-item:hover .submenu,
.nav-item:focus-within .submenu {
    display: block;
}

.submenu a {
    display: block;
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius);
    color: var(--color-text);
    text-decoration: none;
    font-size: 0.9rem;
}

.submenu a:hover,
.submenu a:focus-visible {
    background-color: var(--color-bg-alt);
    color: var(--color-primary);
}

/* Footer */
.site-footer {
    margin-top: var(--space-8);
    background: var(--color-bg-alt);
    border-top: 1px solid var(--color-border);
    padding: var(--space-5) 0;
    color: var(--color-text-muted);
    font-size: 0.9rem;
}

.site-footer p {
    margin: 0 0 var(--space-1);
}

.site-footer strong {
    color: var(--color-text);
}

/* Mobile nav */
@media (max-width: 768px) {
    .nav-toggle {
        display: inline-flex;
    }

    .main-nav {
        position: absolute;
        top: 64px;
        left: 0;
        right: 0;
        background: var(--color-bg);
        border-bottom: 1px solid var(--color-border);
        box-shadow: var(--shadow);
        display: none;
    }

    .main-nav.is-open {
        display: block;
    }

    .main-nav > ul {
        flex-direction: column;
        padding: var(--space-2);
    }

    .main-nav .nav-item {
        flex-direction: column;
        align-items: stretch;
    }

    .main-nav .nav-item > a {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
    }

    .submenu {
        position: static;
        display: none;
        box-shadow: none;
        border: none;
        margin-left: var(--space-3);
    }

    .nav-item.is-open .submenu {
        display: block;
    }

    .nav-item.is-open > .submenu-toggle {
        transform: rotate(180deg);
    }

    .submenu-toggle {
        display: inline-flex;
        align-items: center;
        justify-content: center;
        position: absolute;
        top: 4px;
        right: var(--space-1);
        width: 32px;
        height: 32px;
        background: none;
        border: none;
        color: var(--color-text-muted);
        cursor: pointer;
        font-size: 0.8rem;
    }

    .wordmark-text .en { display: none; }
}