/* ==========================================================================
   HEADER & MENU — Căn giữa ổn định mọi tỉ lệ màn hình
   ========================================================================= */

.header {
    width: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1000;
    background: linear-gradient(to bottom, rgba(12, 41, 79, 0.9) 0%, rgba(12, 41, 79, 0) 100%);
    padding: 1.8rem 0;
    transition: background 0.3s ease-in-out, padding 0.3s ease-in-out;
}

.header.scrolled {
    position: fixed;
    background: var(--hpr-primary) !important;
    padding: 0.8rem 0;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.2);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

/* Lưới 3 cột: logo | menu (giữa) | search — không dùng padding-left hack */
.header-container {
    position: relative;
    width: 90%;
    max-width: 1400px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: minmax(100px, 180px) minmax(0, 1fr) minmax(100px, 200px);
    align-items: center;
    column-gap: clamp(12px, 2vw, 32px);
}

.logo {
    grid-column: 1;
    justify-self: start;
    color: #fff;
    font-weight: 800;
    font-size: clamp(1.4rem, 2.5vw, 1.8rem);
    line-height: 1;
    cursor: pointer;
    text-align: center;
    white-space: nowrap;
}

.logo-b { color: #fff; }
.logo-h { color: var(--hpr-accent); }
.logo-s { color: #fff; }

.logo-sub {
    font-size: clamp(0.5rem, 1vw, 0.6rem);
    letter-spacing: 3px;
    font-weight: 400;
    margin-top: 2px;
}

.nav-menu {
    grid-column: 2;
    justify-self: center;
    width: 100%;
    max-width: 100%;
    display: flex;
    justify-content: center;
    padding: 0;
    min-width: 0;
}

.nav-menu ul {
    display: flex;
    flex-wrap: nowrap;
    list-style: none;
    gap: clamp(0.6rem, 1.2vw, 1.8rem);
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 0;
    width: 100%;
    max-width: 100%;
}

.nav-menu ul li {
    position: relative;
    flex-shrink: 0;
}

.nav-menu ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.84rem !important;
    font-weight: 600;
    letter-spacing: 0.5px;
    padding: 0.5rem 0;
    display: block;
    white-space: nowrap;
    transition: color 0.3s ease;
    cursor: pointer;
}

.nav-menu ul li a:hover,
.nav-menu ul li a.active {
    color: #fff;
}

.search-box {
    grid-column: 3;
    justify-self: end;
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 5px 15px;
    width: 100%;
    max-width: 200px;
    min-width: 140px;
}

.search-box input {
    background: none;
    border: none;
    outline: none;
    color: #fff;
    font-size: 0.8rem;
    width: 100%;
    min-width: 0;
}

.search-box input::placeholder {
    color: rgba(255, 255, 255, 0.5);
}

.search-box button {
    background: none;
    border: none;
    color: rgba(255, 255, 255, 0.7);
    cursor: pointer;
    font-size: 0.8rem;
    flex-shrink: 0;
}

/* Tìm kiếm toàn site */
.search-box.site-search {
    position: relative;
}

.site-search__results {
    position: absolute;
    top: calc(100% + 8px);
    right: 0;
    width: min(92vw, 360px);
    max-height: 320px;
    overflow: auto;
    background: #fff;
    border-radius: 10px;
    box-shadow: 0 14px 36px rgba(8, 28, 50, 0.28);
    border: 1px solid rgba(11, 41, 79, 0.1);
    z-index: 1300;
    padding: 0.35rem 0;
}

.site-search__list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.site-search__item {
    width: 100%;
    border: none;
    background: transparent;
    text-align: left;
    padding: 0.62rem 0.85rem;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    gap: 0.15rem;
    font-family: inherit;
}

.site-search__item:hover,
.site-search__item.is-active {
    background: rgba(0, 180, 216, 0.1);
}

.site-search__item-title {
    color: #0b294f;
    font-size: 0.84rem;
    font-weight: 700;
    line-height: 1.35;
}

.site-search__item-cat {
    color: #5a6b7d;
    font-size: 0.72rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.site-search__empty {
    margin: 0;
    padding: 0.75rem 0.85rem;
    color: #5a6b7d;
    font-size: 0.82rem;
}

.mobile-menu-toggle {
    display: none;
    color: #fff;
    font-size: 1.5rem;
    cursor: pointer;
    line-height: 1;
    padding: 4px;
}

/* Dropdown căn giữa theo mục menu cha */
.dropdown-menu {
    position: absolute;
    top: 100%;
    left: 50%;
    margin-top: 10px;
    margin-left: 0;
    background: #fff;
    border-radius: 4px;
    min-width: 250px;
    padding: 0.8rem 0;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
    display: flex;
    flex-direction: column;
    opacity: 0;
    visibility: hidden;
    transform: translateX(-50%) translateY(10px);
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 1100;
    text-align: left;
}

.nav-menu ul li:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(5px);
}

.dropdown-menu li {
    width: 100%;
}

.dropdown-menu li a {
    color: #333 !important;
    font-size: 0.85rem !important;
    font-weight: 500;
    padding: 0.6rem 1.5rem !important;
    text-align: left;
    white-space: normal;
    transition: all 0.2s;
}

.dropdown-menu li a:hover {
    background: rgba(0, 180, 216, 0.08);
    color: #00b4d8 !important;
    padding-left: 1.8rem !important;
}

/* Tablet: thu gọn khoảng cách, vẫn giữ menu ngang */
@media (max-width: 1200px) {
    .header-container {
        grid-template-columns: minmax(90px, 150px) minmax(0, 1fr) minmax(90px, 180px);
    }

    .search-box {
        max-width: 170px;
        min-width: 120px;
    }
}

/* Màn hẹp: chuyển menu hamburger (tránh tràn / lệch) */
@media (max-width: 992px) {
    .header {
        padding: 1rem 0;
    }

    .header.scrolled {
        padding: 0.8rem 0;
    }

    .header-container {
        display: flex;
        flex-wrap: wrap;
        justify-content: space-between;
        align-items: center;
        row-gap: 0;
    }

    .mobile-menu-toggle {
        display: block;
        order: 1;
    }

    .logo {
        order: 2;
        grid-column: unset;
        justify-self: unset;
    }

    .search-box {
        order: 3;
        grid-column: unset;
        justify-self: unset;
        max-width: 44px;
        min-width: 44px;
        padding: 5px 10px;
        border: none;
        background: transparent;
    }

    .search-box input {
        display: none;
    }

    .search-box button {
        font-size: 1.2rem;
    }

    .nav-menu {
        order: 4;
        grid-column: unset;
        justify-self: unset;
        width: 100%;
        flex: none;
        position: absolute;
        top: 100%;
        left: 0;
        background: #0b294f;
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.4s ease-in-out;
    }

    .nav-menu.show {
        max-height: 520px;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
        overflow-y: auto;
    }

    .nav-menu ul {
        flex-direction: column;
        align-items: stretch;
        gap: 0.3rem;
        padding: 1rem 5% 1.4rem;
    }

    .nav-menu ul li {
        width: 100%;
    }

    .nav-menu ul li a {
        font-size: 1.05rem !important;
        font-weight: 700;
        letter-spacing: 0.3px;
        padding: 0.7rem 0;
    }

    .dropdown-menu {
        position: static;
        transform: none;
        opacity: 1;
        visibility: visible;
        box-shadow: none;
        background: rgba(255, 255, 255, 0.07);
        margin-top: 0;
        display: none;
        min-width: 0;
        border-radius: 8px;
        padding: 0.35rem 0;
    }

    .nav-menu ul li:hover .dropdown-menu,
    .nav-menu ul li:focus-within .dropdown-menu {
        display: flex;
        transform: none;
    }

    .dropdown-menu li a {
        color: rgba(255, 255, 255, 0.9) !important;
        font-size: 0.93rem !important;
        font-weight: 500;
        letter-spacing: 0.25px;
        padding: 0.62rem 1rem !important;
    }

    .dropdown-menu li a:hover {
        background: rgba(0, 180, 216, 0.12);
        color: #7be5ff !important;
        padding-left: 1rem !important;
    }
}

@media (max-width: 768px) {
    .header {
        background: #0b294f;
        position: fixed;
    }

    .header:not(.scrolled) {
        background: linear-gradient(to bottom, rgba(12, 41, 79, 0.95) 0%, rgba(12, 41, 79, 0.85) 100%);
    }
}