/* ========================================
   Vibrant Gradient Theme - Navigation
   nav.css
   ======================================== */

/* === Mobile Nav === */
.tp4-nav-wrapper {
    position: relative;
    z-index: 1000;
}

.tp4-mobile-nav-wrapper {
    display: block;
}

.tp4-mobile-nav {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1050;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 12px;
    height: 52px;
    background: rgba(15, 12, 41, 0.9);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--tp4-border);
    transition: background 0.3s ease, backdrop-filter 0.3s ease;
}

.tp4-mobile-nav.scrolled {
    background: rgba(15, 12, 41, 0.85);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--tp4-border);
}

.tp4-nav-edge {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

.tp4-back-btn,
.tp4-search-btn,
.tp4-menu-btn {
    background: none;
    border: none;
    padding: 8px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    transition: var(--tp4-transition);
}

.tp4-back-btn:hover,
.tp4-search-btn:hover,
.tp4-menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.tp4-mobile-logo {
    display: flex;
    align-items: center;
}

.tp4-mobile-logo img {
    height: 28px;
    width: auto;
}

.tp4-logo-site-name {
    font-size: 18px;
    font-weight: 800;
    background: var(--tp4-gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tp4-mobile-nav-title {
    flex: 1;
    text-align: center;
    font-size: 15px;
    font-weight: 600;
    color: var(--tp4-text-primary);
    padding: 0 8px;
}

.tp4-mobile-header-nav ul {
    list-style: none;
    display: flex;
    padding: 0;
    margin: 0;
    gap: 16px;
    overflow-x: auto;
}

.tp4-mobile-nav-height {
    height: 52px;
}

/* Mobile menu */
.tp4-mobile-menu {
    position: fixed;
    top: 52px;
    right: 0;
    width: 280px;
    max-height: calc(100vh - 52px);
    z-index: 1040;
    pointer-events: none;
    overflow: hidden;
}

.tp4-mobile-menu.show {
    pointer-events: auto;
}

.tp4-mobile-menu .collapse {
    background: rgba(15, 12, 41, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-left: 1px solid var(--tp4-border);
    border-bottom: 1px solid var(--tp4-border);
    border-radius: 0 0 0 var(--tp4-radius-lg);
    overflow-y: auto;
    max-height: calc(100vh - 52px);
}

.tp4-mobile-menu-list {
    list-style: none;
    padding: 8px 0;
    margin: 0;
}

.tp4-mobile-menu-list > li {
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.tp4-menu-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 12px 20px;
    color: var(--tp4-text-secondary);
    font-size: 14px;
    transition: var(--tp4-transition);
    cursor: pointer;
    text-decoration: none;
}

.tp4-menu-item:hover,
.tp4-menu-item:focus {
    color: var(--tp4-text-primary);
    background: rgba(102, 126, 234, 0.1);
}

.tp4-menu-item img {
    width: 16px;
    height: 16px;
    opacity: 0.4;
    filter: invert(1);
    transition: var(--tp4-transition);
}

.tp4-menu-item:hover img {
    opacity: 0.7;
}

.tp4-menu-item-link {
    text-decoration: none;
}

.tp4-mobile-menu-subs {
    list-style: none;
    padding: 0;
    margin: 0;
    background: rgba(255, 255, 255, 0.03);
}

.tp4-mobile-menu-subs .tp4-menu-item {
    padding-left: 36px;
    font-size: 13px;
}

/* === PC Nav === */
.tp4-pc-nav-overlay {
    display: none;
}

@media screen and (min-width: 825px) {
    .tp4-mobile-nav-wrapper {
        display: none;
    }

    .tp4-pc-nav-overlay {
        display: block;
        position: relative;
        z-index: 1000;
    }

    .tp4-nav-placeholder {
        min-height: 64px;
    }

    .tp4-pc-nav {
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        z-index: 1050;
        display: flex;
        align-items: center;
        padding: 0 24px;
        height: 64px;
        background: transparent;
        transition: background 0.3s ease, backdrop-filter 0.3s ease;
        gap: 4px;
    }

    .tp4-pc-nav.scrolled {
        background: rgba(15, 12, 41, 0.9);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border-bottom: 1px solid var(--tp4-border);
    }

    .tp4-logo {
        display: flex;
        align-items: center;
        margin-right: 20px;
        text-decoration: none;
    }

    .tp4-logo img {
        height: 32px;
        width: auto;
    }

    .tp4-nav-item {
        position: relative;
    }

    .tp4-nav-btn {
        display: flex;
        align-items: center;
        gap: 4px;
        padding: 8px 14px;
        color: var(--tp4-text-secondary);
        font-size: 14px;
        font-weight: 500;
        border-radius: var(--tp4-radius-sm);
        transition: var(--tp4-transition);
        cursor: pointer;
        text-decoration: none;
        white-space: nowrap;
        border: none;
        background: none;
    }

    .tp4-nav-btn:hover {
        color: var(--tp4-text-primary);
        background: rgba(102, 126, 234, 0.15);
    }

    .tp4-arrow-icon {
        width: 12px;
        height: 12px;
        opacity: 0.5;
        filter: invert(1);
        transition: transform 0.3s;
    }

    .tp4-nav-item.showNav .tp4-arrow-icon {
        transform: rotate(180deg);
    }

    /* Dropdown */
    .tp4-dropdown-box {
        position: absolute;
        top: 100%;
        left: 0;
        min-width: 160px;
        padding: 8px 0;
        background: rgba(15, 12, 41, 0.95);
        backdrop-filter: blur(20px);
        -webkit-backdrop-filter: blur(20px);
        border: 1px solid var(--tp4-border);
        border-radius: var(--tp4-radius);
        box-shadow: var(--tp4-shadow);
        opacity: 0;
        visibility: hidden;
        transform: translateY(8px);
        transition: var(--tp4-transition);
    }

    .tp4-nav-item:hover .tp4-dropdown-box,
    .tp4-nav-item.showNav .tp4-dropdown-box {
        opacity: 1;
        visibility: visible;
        transform: translateY(0);
    }

    .tp4-dropdown-item {
        display: block;
        padding: 8px 16px;
        color: var(--tp4-text-secondary);
        font-size: 13px;
        transition: var(--tp4-transition);
        text-decoration: none;
    }

    .tp4-dropdown-item:hover {
        color: var(--tp4-text-primary);
        background: rgba(102, 126, 234, 0.15);
    }

    .tp4-search-box {
        position: relative;
        margin-left: auto;
        display: flex;
        align-items: center;
        overflow: visible;
        background: rgba(255, 255, 255, 0.08);
        border: 1px solid var(--tp4-border);
        border-radius: 24px;
        padding: 0 4px 0 16px;
        transition: var(--tp4-transition);
    }

    .tp4-search-box:focus-within {
        border-color: var(--tp4-accent-alt);
        background: rgba(255, 255, 255, 0.12);
        box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.15);
    }

    .tp4-search-input {
        background: none;
        border: none;
        outline: none;
        color: var(--tp4-text-primary);
        font-size: 13px;
        width: 180px;
        padding: 8px 0;
    }

    .tp4-search-input::placeholder {
        color: var(--tp4-text-muted);
    }

    .tp4-search-opt {
        display: flex;
        align-items: center;
        gap: 8px;
        padding-left: 8px;
    }

    .tp4-search-opt a {
        font-size: 12px;
        color: var(--tp4-accent);
        white-space: nowrap;
    }

    .tp4-search-line {
        width: 1px;
        height: 16px;
        background: var(--tp4-border);
    }

    .tp4-hot-icon {
        width: 16px;
        height: 16px;
    }

    .tp4-search-icon {
        width: 18px;
        height: 18px;
        cursor: pointer;
        padding: 4px;
        border-radius: 50%;
        transition: var(--tp4-transition);
    }

    .tp4-search-icon:hover {
        background: rgba(255, 255, 255, 0.1);
    }
}