/* ──────────────────────────────────────────────────────────────────
   Header Component
   Layout: [ logo ] | [ search (grow) ] | [ nav ] | [ theme toggle ]
   Mobile: search wraps to its own full-width row.
   ────────────────────────────────────────────────────────────────── */

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

.sn-header__inner {
    max-width: var(--sn-container);
    margin: 0 auto;
    padding: 10px 24px;
    display: flex;
    align-items: center;
    gap: 16px;
    min-height: 64px;
}

/* ── Brand / Logo ── */
.sn-header__brand {
    flex-shrink: 0;
}

.sn-header__logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
}

.sn-header__logo {
    max-height: 38px;
    width: auto;
}

/* Light/dark logo switch */
.sn-header__logo--dark {
    display: none;
}

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

[data-theme="dark"] .sn-header__logo--dark {
    display: block;
}

/* ── Header search (between logo and nav) ── */
.sn-header__search {
    display: flex;
    align-items: center;
    flex: 1 1 auto;
    min-width: 0;
    max-width: 380px;
    background: var(--sn-bg-secondary, rgba(91,108,255,0.05));
    border: 1px solid var(--sn-border);
    border-radius: var(--sn-radius-full, 999px);
    padding: 0 4px 0 14px;
    height: 38px;
    transition: border-color 0.2s, box-shadow 0.2s;
}

.sn-header__search:focus-within {
    border-color: var(--sn-primary);
    box-shadow: 0 0 0 3px rgba(91,108,255,0.12);
}

.sn-header__search-input {
    flex: 1;
    min-width: 0;
    border: 0;
    outline: 0;
    background: transparent;
    font: inherit;
    font-size: 0.875rem;
    color: var(--sn-text-primary);
    padding: 0;
}

.sn-header__search-input::placeholder {
    color: var(--sn-text-muted);
}

.sn-header__search-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    width: 30px;
    height: 30px;
    border: 0;
    background: transparent;
    color: var(--sn-text-secondary);
    cursor: pointer;
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
}

.sn-header__search-btn:hover {
    color: var(--sn-primary);
    background: rgba(91,108,255,0.1);
}

.screen-reader-text {
    border: 0;
    clip: rect(1px, 1px, 1px, 1px);
    -webkit-clip-path: inset(50%);
    clip-path: inset(50%);
    height: 1px;
    margin: -1px;
    overflow: hidden;
    padding: 0;
    position: absolute !important;
    width: 1px;
    word-wrap: normal !important;
}

/* ── Right cluster: nav + theme toggle ── */
.sn-header__right {
    display: flex;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

/* ── Navigation ── */
.sn-header__nav {
    display: flex;
    align-items: center;
}

.sn-header__menu {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    gap: 24px;
}

.sn-header__menu a {
    font-family: var(--sn-font);
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--sn-text-body);
    text-decoration: none;
    transition: color 0.2s ease;
    white-space: nowrap;
}

.sn-header__menu a:hover,
.sn-header__menu .current-menu-item > a {
    color: var(--sn-primary);
}

/* Sub-menu */
.sn-header__menu .sub-menu {
    list-style: none;
    margin: 0;
    padding: 8px 0;
    position: absolute;
    top: 100%;
    left: 0;
    min-width: 180px;
    background-color: var(--sn-card-bg);
    border: 1px solid var(--sn-border);
    border-radius: var(--sn-radius);
    box-shadow: var(--sn-shadow-md);
    display: none;
    z-index: 10;
}

.sn-header__menu li {
    position: relative;
}

.sn-header__menu li:hover > .sub-menu {
    display: block;
}

.sn-header__menu .sub-menu a {
    display: block;
    padding: 8px 16px;
    font-size: 0.875rem;
}

.sn-header__menu .sub-menu a:hover {
    background-color: var(--sn-surface-hover);
}

/* ── Search toggle (mobile-only icon button) ── */
.sn-header__search-toggle {
    display: none;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    padding: 0;
    background: none;
    border: 0;
    cursor: pointer;
    color: var(--sn-text-secondary);
    border-radius: 50%;
    transition: color 0.2s, background 0.2s;
    flex-shrink: 0;
}

.sn-header__search-toggle:hover {
    color: var(--sn-primary);
    background: rgba(91,108,255,0.1);
}

.sn-header__search-toggle .icon-close {
    display: none;
}

.sn-header__search-toggle.is-active .icon-search {
    display: none;
}

.sn-header__search-toggle.is-active .icon-close {
    display: block;
}

/* ── Hamburger Toggle (mobile) ── */
.sn-header__toggle {
    display: none;
    flex-direction: column;
    justify-content: center;
    gap: 5px;
    width: 40px;
    height: 40px;
    padding: 10px;
    background: none;
    border: none;
    cursor: pointer;
    flex-shrink: 0;
}

.sn-header__toggle-bar {
    display: block;
    width: 22px;
    height: 2px;
    background-color: var(--sn-text-primary);
    border-radius: 2px;
    transition: transform 0.3s ease, opacity 0.3s ease;
}

/* Animated X when open */
.sn-header__toggle.is-active .sn-header__toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
}

.sn-header__toggle.is-active .sn-header__toggle-bar:nth-child(2) {
    opacity: 0;
}

.sn-header__toggle.is-active .sn-header__toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
}

/* ── Tablet ── */
@media (max-width: 1024px) {
    .sn-header__search {
        max-width: 280px;
    }

    .sn-header__menu {
        gap: 18px;
    }
}

/* ── Mobile ── */
@media (max-width: 768px) {
    .sn-header__inner {
        flex-wrap: wrap;
        padding: 10px 16px;
        gap: 10px;
    }

    .sn-header__brand {
        margin-right: auto;
    }

    /* Search collapsed by default; expands to a full-width row when toggle is active */
    .sn-header__search {
        order: 10;
        flex: 0 0 100%;
        max-width: 100%;
        height: 40px;
        display: none;
    }

    .sn-header__search.is-open {
        display: flex;
    }

    .sn-header__search-toggle {
        display: inline-flex;
        order: 3;
        width: 36px;
        height: 36px;
    }

    .sn-header__toggle {
        display: flex;
        order: 5;
    }

    .sn-theme-toggle {
        order: 4;
    }

    /* Right cluster: only theme toggle remains visible inline; nav is collapsed */
    .sn-header__right {
        order: 4;
        gap: 8px;
    }

    .sn-header__nav {
        display: none;
        order: 20;
        flex: 1 0 100%;
        width: 100%;
        background-color: var(--sn-card-bg);
        border-top: 1px solid var(--sn-border);
        margin: 6px -16px -10px;
        padding: 8px 16px 12px;
        box-sizing: border-box;
    }

    .sn-header__nav.is-open {
        display: block;
    }

    .sn-header__menu {
        flex-direction: column;
        gap: 0;
    }

    .sn-header__menu li {
        border-bottom: 1px solid var(--sn-border-light);
    }

    .sn-header__menu li:last-child {
        border-bottom: none;
    }

    .sn-header__menu a {
        display: block;
        padding: 12px 0;
    }

    .sn-header__menu .sub-menu {
        position: static;
        border: none;
        box-shadow: none;
        padding-left: 16px;
        display: block;
    }
}

@media (max-width: 480px) {
    .sn-header__logo {
        max-height: 32px;
    }
}