.header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: color-mix(in srgb, var(--surface) 88%, transparent);
    backdrop-filter: saturate(160%) blur(10px);
    border-bottom: 1px solid var(--border);
}

.header__inner {
    max-width: var(--container);
    margin: 0 auto;
    height: 60px;
    padding: 0 16px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
}

.header__logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 17px; }

.header__logo-mark {
    width: 32px; height: 32px;
    display: grid; place-items: center;
    border-radius: 9px;
    background: var(--primary);
    color: var(--on-primary);
}
.header__logo-mark svg { width: 18px; height: 18px; }

.header__nav { display: flex; align-items: center; gap: 8px; }

.header__link {
    padding: 8px 10px;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    font-weight: 600;
    font-size: 14px;
}
.header__link:hover { color: var(--text); background: var(--surface-2); }

.header__link--settings { display: inline-flex; align-items: center; gap: 6px; }
.header__link-icon { width: 16px; height: 16px; }

.header__dot {
    display: inline-block;
    width: 7px;
    height: 7px;
    margin-left: 5px;
    vertical-align: 2px;
    border-radius: 50%;
    background: var(--warning);
}

.header__theme {
    width: 34px; height: 34px;
    display: grid; place-items: center;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
}
.header__theme:hover { background: var(--surface-2); color: var(--text); }
.header__theme svg { width: 18px; height: 18px; }

.header__theme .icon-sun { display: none; }
:root[data-theme="dark"] .header__theme .icon-sun { display: block; }
:root[data-theme="dark"] .header__theme .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .header__theme .icon-sun { display: block; }
    :root:not([data-theme="light"]) .header__theme .icon-moon { display: none; }
}

/* ===================== 회원 메뉴 ===================== */
.user-menu { position: relative; margin-left: 4px; }

.user-menu__button {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    height: 36px;
    padding: 0 10px 0 14px;
    border-radius: 999px;
    border: 1px solid var(--border);
    background: var(--surface);
    color: var(--text);
    font-weight: 600;
    font-size: 14px;
}
.user-menu__button:hover { background: var(--surface-2); }
.user-menu__button:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

.user-menu__name { max-width: 120px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.user-menu__chevron { width: 16px; height: 16px; color: var(--text-subtle); transition: transform .15s; }
.user-menu__button[aria-expanded="true"] .user-menu__chevron { transform: rotate(180deg); }

.user-menu__list {
    position: absolute;
    right: 0;
    top: calc(100% + 8px);
    min-width: 200px;
    padding: 6px;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    background: var(--surface);
    box-shadow: var(--shadow);
    z-index: 60;
}
.user-menu__list[hidden] { display: none; }

.user-menu__heading {
    padding: 8px 10px 10px;
    margin-bottom: 4px;
    border-bottom: 1px solid var(--border);
    font-size: 13px;
    color: var(--text-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.user-menu__heading strong { color: var(--text); }

.user-menu__item {
    width: 100%;
    display: flex;
    align-items: center;
    gap: 10px;
    padding: 9px 10px;
    border-radius: var(--radius-sm);
    color: var(--text);
    font-size: 14px;
    font-weight: 500;
    text-align: left;
}
.user-menu__item:hover, .user-menu__item:focus-visible { background: var(--surface-2); outline: none; }
.user-menu__item--danger { color: var(--danger); }
.user-menu__item--danger:hover, .user-menu__item--danger:focus-visible { background: var(--danger-soft); }

.user-menu__icon { width: 18px; height: 18px; display: grid; place-items: center; }
.user-menu__icon svg { width: 18px; height: 18px; }

/* 테마 메뉴 문구·아이콘: 지금 테마의 반대(바꿀 테마)를 보여준다 */
.user-menu__icon .icon-sun, .theme-label--light { display: none; }
:root[data-theme="dark"] .user-menu__icon .icon-sun,
:root[data-theme="dark"] .theme-label--light { display: block; }
:root[data-theme="dark"] .user-menu__icon .icon-moon,
:root[data-theme="dark"] .theme-label--dark { display: none; }
@media (prefers-color-scheme: dark) {
    :root:not([data-theme="light"]) .user-menu__icon .icon-sun,
    :root:not([data-theme="light"]) .theme-label--light { display: block; }
    :root:not([data-theme="light"]) .user-menu__icon .icon-moon,
    :root:not([data-theme="light"]) .theme-label--dark { display: none; }
}

@media (max-width: 520px) {
    .user-menu__name { max-width: 84px; }
    .user-menu__button { padding: 0 8px 0 12px; gap: 4px; }
    .header__link { display: none; }
    .header__link--settings { display: inline-flex; }
    .header__link-text { display: none; }
    .header__logo-text { display: none; }
}