/* SG Header — sticky glass effect (ported from sblog-slanggenz .site-header) */

.sg-header {
    width: min(1240px, calc(100% - 32px));
    margin: 14px auto 0;
    padding: 0 18px;
    border: 1px solid var(--sg-line);
    border-radius: 18px;
    display: flex;
    flex-direction: column;
    position: sticky;
    top: 12px;
    z-index: 50;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
    background: color-mix(in srgb, var(--sg-bg) 78%, transparent);
    transition: background 240ms ease, border-color 240ms ease, box-shadow 240ms ease;
}

/* Khi nav mobile mở — nhấn nhẹ viền lime để biết trạng thái */
.sg-header.nav-open {
    border-color: color-mix(in srgb, var(--sg-lime) 35%, var(--sg-line));
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.28);
}

.sg-header-inner {
    width: 100%;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
}

.sg-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--sg-text);
    text-decoration: none;
}

.sg-logo-mark {
    display: grid;
    place-items: center;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    background: var(--sg-lime);
    color: #0c0d0a;
    font-weight: 900;
    transform: rotate(-4deg);
    font-size: 18px;
}

.sg-logo-text {
    display: flex;
    flex-direction: column;
    line-height: 1.05;
}

.sg-logo-text strong {
    font-size: 15px;
    font-weight: 800;
}

.sg-logo-text small {
    color: var(--sg-muted);
    font-size: 10px;
    letter-spacing: .08em;
    text-transform: uppercase;
    margin-top: 4px;
}

.sg-nav-desktop {
    display: flex;
    gap: 28px;
    font-size: 13px;
    font-weight: 600;
    color: var(--sg-muted);
}

.sg-nav-desktop a {
    color: inherit;
    text-decoration: none;
    transition: color 200ms ease;
}

.sg-nav-desktop a:hover {
    color: var(--sg-text);
}

.sg-header-actions {
    display: flex;
    gap: 8px;
}

.sg-icon-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: 11px;
    background: transparent;
    border: 1px solid var(--sg-line);
    color: var(--sg-text);
    cursor: pointer;
    transition: all 200ms ease;
    font-size: 14px;
    font-weight: 600;
}

.sg-icon-btn:hover {
    background: var(--sg-card-2);
    border-color: var(--sg-text);
}

.sg-menu-btn {
    width: auto;
    padding: 0 12px;
    gap: 8px;
    font-size: 13px;
}

/* Burger icon — 3 gạch, morph thành X khi .is-open */
.sg-burger {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    gap: 3.5px;
    width: 16px;
    height: 16px;
}

.sg-burger-line {
    display: block;
    height: 2px;
    width: 100%;
    border-radius: 2px;
    background: currentColor;
    transform-origin: center;
    transition: transform 280ms cubic-bezier(0.65, 0, 0.35, 1), opacity 180ms ease;
}

.sg-menu-btn.is-open .sg-burger-line:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
}

.sg-menu-btn.is-open .sg-burger-line:nth-child(2) {
    opacity: 0;
    transform: scaleX(0.2);
}

.sg-menu-btn.is-open .sg-burger-line:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
}

.sg-menu-label {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    text-transform: uppercase;
}

/* ============================================================
 * Mobile nav panel — expand ngay trong shell glass của header.
 * Kỹ thuật grid-template-rows 0fr → 1fr: animate height mượt
 * không cần JS đo kích thước. Links stagger theo nth-child.
 * ============================================================ */
.sg-nav-mobile {
    display: grid;
    grid-template-rows: 0fr;
    width: 100%;
    transition: grid-template-rows 340ms cubic-bezier(0.65, 0, 0.35, 1);
}

.sg-nav-mobile.is-open {
    grid-template-rows: 1fr;
}

.sg-nav-mobile-panel {
    min-height: 0;
    overflow: hidden;
    border-top: 0 solid var(--sg-line);
    transition: border-width 0s linear 340ms;
}

.sg-nav-mobile.is-open .sg-nav-mobile-panel {
    border-top-width: 1px;
    transition-delay: 0s;
}

.sg-nav-mobile-list {
    list-style: none;
    margin: 0;
    padding: 10px 2px 14px;
    counter-reset: sg-nav;
}

.sg-nav-mobile-list li {
    counter-increment: sg-nav;
    opacity: 0;
    transform: translateY(-8px);
    transition: opacity 240ms ease, transform 280ms cubic-bezier(0.22, 1, 0.36, 1);
}

.sg-nav-mobile.is-open .sg-nav-mobile-list li {
    opacity: 1;
    transform: translateY(0);
}

/* Stagger 40ms/link khi mở */
.sg-nav-mobile.is-open .sg-nav-mobile-list li:nth-child(1) { transition-delay: 60ms; }
.sg-nav-mobile.is-open .sg-nav-mobile-list li:nth-child(2) { transition-delay: 100ms; }
.sg-nav-mobile.is-open .sg-nav-mobile-list li:nth-child(3) { transition-delay: 140ms; }
.sg-nav-mobile.is-open .sg-nav-mobile-list li:nth-child(4) { transition-delay: 180ms; }
.sg-nav-mobile.is-open .sg-nav-mobile-list li:nth-child(5) { transition-delay: 220ms; }

.sg-nav-mobile-list a {
    display: flex;
    align-items: center;
    gap: 14px;
    min-height: 48px;
    padding: 10px 14px;
    border-radius: 12px;
    color: var(--sg-text);
    text-decoration: none;
    font-size: 15px;
    font-weight: 700;
    transition: background 180ms ease, transform 180ms ease;
}

/* Số thứ tự 01–05 màu lime — cùng DNA với Trend Radar */
.sg-nav-mobile-list a::before {
    content: "0" counter(sg-nav);
    font-family: var(--sg-font-display);
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    color: var(--sg-lime);
    opacity: 0.85;
}

/* Mũi tên trượt vào khi chạm — glyph text, không emoji */
.sg-nav-mobile-list a::after {
    content: "\2192";
    margin-left: auto;
    color: var(--sg-muted);
    opacity: 0;
    transform: translateX(-6px);
    transition: opacity 180ms ease, transform 220ms cubic-bezier(0.22, 1, 0.36, 1);
}

.sg-nav-mobile-list a:hover,
.sg-nav-mobile-list a:active {
    background: var(--sg-card-2);
    transform: translateX(2px);
}

.sg-nav-mobile-list a:hover::after,
.sg-nav-mobile-list a:active::after {
    opacity: 1;
    transform: translateX(0);
}

/* Trang hiện tại — vạch lime bên trái + chữ lime */
.sg-nav-mobile-list a[aria-current="page"] {
    background: color-mix(in srgb, var(--sg-lime) 10%, transparent);
    box-shadow: inset 3px 0 0 var(--sg-lime);
    color: var(--sg-lime);
}

.sg-nav-mobile-list a[aria-current="page"]::before {
    opacity: 1;
}

/* Mobile breakpoint — hide desktop, show mobile trigger */
@media (max-width: 768px) {
    .sg-nav-desktop {
        display: none;
    }
    .sg-header {
        margin-top: 10px;
    }
    .sg-header-inner {
        height: 64px;
    }
    /* Ẩn label "Menu" trên màn rất hẹp, chỉ giữ icon */
    .sg-menu-label {
        display: none;
    }
    .sg-menu-btn {
        padding: 0 10px;
    }
}

@media (min-width: 769px) {
    .sg-menu-btn,
    .sg-nav-mobile {
        display: none;
    }
}