/* ============================================================================
   Header, dropdown, drawer, footer
   ========================================================================= */

.site-header {
    position: sticky;
    top: 0;
    z-index: 100;
    height: var(--nav-h);
    background: var(--bg-body);
    border-bottom: 1px solid var(--border);
}

.header-inner {
    height: 100%;
    display: flex;
    align-items: center;
    gap: 8px;
}

/* --- Logo --- */
.brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 19px;
    font-weight: 700;
    letter-spacing: 0.02em;
    margin-right: 20px;
    flex-shrink: 0;
}
.brand-logo-svg {
    color: #FFFFFF;
    height: 32px;
    width: auto;
    display: block;
}
.brand-logo-svg .logo-primary { fill: currentColor; }
.brand-logo-svg .logo-accent { fill: #FFB633; }
:root[data-theme="light"] .brand-logo-svg { color: #1E2329; }
.brand-logo-img {
    height: 40px;
    width: auto;
    display: block;
}
.brand-logo--footer { margin: 0 0 12px; padding: 0; }
.brand-logo--drawer .brand-logo-svg { height: 30px; }
.brand-name .accent { color: var(--brand); }
.brand-mark {
    display: grid;
    place-items: center;
    width: 30px; height: 30px;
    border-radius: var(--radius-sm);
    background: var(--brand);
    color: var(--brand-text);
    font-size: 12px;
    font-weight: 800;
    letter-spacing: -0.02em;
}

/* --- Dieu huong --- */
.nav {
    display: flex;
    align-items: center;
    gap: 4px;
    flex: 1;
}

.nav-item {
    position: relative;
    display: flex;
    align-items: center;
    gap: 4px;
    height: var(--nav-h);
    padding: 0 14px;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
}
.nav-item:hover { color: var(--brand); }

/* Trang hien tai: chu vang + gach chan 2px, giong Binance */
.nav-item[aria-current="page"] { color: var(--brand); }
.nav-item[aria-current="page"]::after {
    content: '';
    position: absolute;
    left: 14px; right: 14px; bottom: 0;
    height: 2px;
    background: var(--brand);
    border-radius: 2px 2px 0 0;
}

.nav-item .chev { transition: transform 0.2s var(--ease); }
.nav-group[data-open="true"] .chev { transform: rotate(180deg); }

/* --- Menu xo xuong --- */
/* Moc neo cua .dropdown. Thieu dong nay thi dropdown di tim to tien co position
   gan nhat, gap ngay .site-header (sticky cung tao containing block) va bi day
   ve sat mep trai trang thay vi nam duoi nut. */
.nav-group { position: relative; }

.dropdown {
    position: absolute;
    top: calc(var(--nav-h) - 6px);
    left: 8px;
    min-width: 220px;
    padding: 8px;
    background: var(--bg-surface);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-6px);
    transition: opacity 0.16s var(--ease), transform 0.16s var(--ease), visibility 0.16s;
}
.nav-group[data-open="true"] .dropdown {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.dropdown a {
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 10px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    color: var(--text-primary);
}
.dropdown a:hover { background: var(--bg-surface-2); color: var(--brand); }
.dropdown a svg { color: var(--text-secondary); flex-shrink: 0; }
.dropdown a:hover svg { color: var(--brand); }
.dropdown .dd-sub {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    margin-top: 1px;
}

/* --- Ben phai header --- */
.header-actions {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-shrink: 0;
}

.icon-btn {
    display: grid;
    place-items: center;
    width: 36px; height: 36px;
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    transition: background 0.15s var(--ease), color 0.15s var(--ease);
}
.icon-btn:hover { background: var(--bg-surface-2); color: var(--text-primary); }

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    height: 36px;
    padding: 0 16px;
    border-radius: var(--radius);
    font-size: 14px;
    font-weight: 600;
    white-space: nowrap;
    transition: background 0.15s var(--ease), color 0.15s var(--ease), opacity 0.15s var(--ease);
}
.btn-primary { background: var(--brand); color: var(--brand-text); }
.btn-primary:hover { background: var(--brand-hover); }
.btn-ghost { color: var(--text-primary); }
.btn-ghost:hover { background: var(--bg-surface-2); }
.btn-lg { height: 44px; padding: 0 24px; font-size: 15px; }
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* Trang thai dang nhap: chi mot trong hai khoi duoc hien.
   Dat display o day chu KHONG dat inline tren the - inline se de len rule an
   ben duoi va lam ca hai khoi cung hien. */
.auth-guest { display: flex; align-items: center; gap: 8px; }
.auth-user  { display: flex; }

[data-auth-state="guest"] .auth-user,
[data-auth-state="user"]  .auth-guest { display: none !important; }

.drawer .auth-guest,
.drawer .auth-user { flex-direction: column; align-items: stretch; }

.avatar {
    display: grid;
    place-items: center;
    width: 32px; height: 32px;
    border-radius: 50%;
    background: var(--brand);
    color: var(--brand-text);
    font-weight: 700;
    font-size: 13px;
}

/* --- Hamburger + drawer --- */
.hamburger { display: none; }

.drawer-backdrop {
    position: fixed;
    inset: 0;
    z-index: 199;
    background: var(--bg-overlay);
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.2s var(--ease), visibility 0.2s;
}
.drawer-backdrop[data-open="true"] { opacity: 1; visibility: visible; }

.drawer {
    position: fixed;
    top: 0; left: 0; bottom: 0;
    z-index: 200;
    width: min(300px, 82vw);
    padding: 20px 16px;
    background: var(--bg-surface);
    border-right: 1px solid var(--border);
    transform: translateX(-100%);
    transition: transform 0.24s var(--ease);
    overflow-y: auto;
}
.drawer[data-open="true"] { transform: translateX(0); }

.drawer .drawer-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 20px;
}
.drawer nav { display: flex; flex-direction: column; gap: 2px; }
.drawer nav a {
    padding: 12px;
    border-radius: var(--radius-sm);
    font-size: 15px;
    font-weight: 500;
}
.drawer nav a:hover { background: var(--bg-surface-2); }
.drawer nav a[aria-current="page"] { color: var(--brand); background: var(--brand-soft); }
.drawer .drawer-actions {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid var(--border);
}

/* --- Footer --- */
.site-footer {
    margin-top: 64px;
    padding: 48px 0 40px;
    border-top: 1px solid var(--border);
    background: var(--bg-surface);
}
.footer-inner {
    display: flex;
    align-items: flex-start;
    justify-content: space-between;
    gap: 32px;
    flex-wrap: wrap;
}
.footer-brand .brand { margin: 0 0 12px; }
.footer-brand p {
    max-width: 44ch;
    font-size: 13px;
    color: var(--text-secondary);
}
.footer-nav {
    display: flex;
    align-items: center;
    gap: 8px;
    flex-wrap: wrap;
}
.footer-nav a {
    padding: 8px 12px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    transition: color 0.15s var(--ease), background 0.15s var(--ease);
}
.footer-nav a:hover { color: var(--brand); background: var(--brand-soft); }

/* --- Responsive: 3 moc theo plan --- */
@media (max-width: 1280px) {
    .nav-item { padding: 0 10px; }
    .nav-item[aria-current="page"]::after { left: 10px; right: 10px; }
}

@media (max-width: 900px) {
    .nav { display: none; }
    .hamburger { display: grid; }
    .brand { margin-right: auto; }
    .header-actions .btn-ghost { display: none; }
}

@media (max-width: 768px) {
    .footer-inner { flex-direction: column; align-items: flex-start; }
}

/* Header o may hep: bo bot chu de nut Dang ky khong bi day ra ngoai.
   Tong be ngang can thiet o 360px la ~382px, vua du tran nen phai cat bot. */
@media (max-width: 520px) {
    .conn span { display: none; }
}

@media (max-width: 400px) {
    .conn { display: none; }
    .brand { font-size: 17px; gap: 6px; }
    .header-actions { gap: 4px; }
}