/* css/header.css */
.site-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-header);
    transition: all 0.3s ease;
    background-color: rgba(250, 240, 228, 0.6); /* 종이 질감과 자연스럽게 이어지는 연한 반투명 배경 */
    border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
    background-color: rgba(250, 240, 228, 0.95);
    border-bottom: 1px solid var(--color-line-form);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 80px;
    transition: height 0.3s ease;
}

.site-header.is-scrolled .site-header__inner {
    height: 60px;
}

.site-header__logo {
    display: flex;
    align-items: center;
    font-family: var(--font-label);
    font-size: var(--font-size-panel-title);
    color: var(--color-brand-primary);
}

.site-header__logo::before {
    content: '';
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--color-accent-pink);
    margin-right: 12px;
}

.site-header__nav-list {
    display: flex;
    align-items: center;
    gap: 40px;
}

.site-header__nav-link {
    display: inline-flex;
    align-items: center;
    font-family: var(--font-label);
    font-size: var(--font-size-button);
    line-height: 1;
    color: var(--color-text-lead);
    text-transform: uppercase;
    position: relative;
    padding: 5px 0;
}

.site-header__nav-link:hover,
.site-header__nav-link:focus-visible,
.site-header__nav-item--has-depth:hover > .site-header__nav-link {
    color: var(--color-brand-primary);
}

.site-header__nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 10px;
    background-color: var(--color-highlight-yellow);
    z-index: -1;
    transform: scaleX(0);
    transform-origin: left;
    transition: transform 0.3s ease;
}

.site-header__nav-link:hover::after,
.site-header__nav-link:focus-visible::after,
.site-header__nav-item--has-depth:hover > .site-header__nav-link::after {
    transform: scaleX(1);
}

.site-header__nav-item--has-depth {
    position: relative;
}

.site-header__nav-link--has-depth {
    gap: 6px;
}

.site-header__nav-arrow {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    flex: 0 0 12px;
    width: 12px;
    height: 12px;
    font-size: 0;
    line-height: 0;
    transform: rotate(0deg);
    transform-origin: center center;
    transition: transform 0.2s ease;
}

.site-header__nav-arrow::before {
    content: '';
    width: 0;
    height: 0;
    border-left: 4px solid transparent;
    border-right: 4px solid transparent;
    border-top: 5px solid currentColor;
}

.site-header__nav-item--has-depth:hover .site-header__nav-arrow {
    transform: rotate(180deg);
}

.site-header__depth-list {
    position: absolute;
    top: 100%;
    left: 50%;
    z-index: calc(var(--z-header) + 1);
    min-width: 136px;
    padding: 8px;
    border: 1px solid var(--color-line-brown-soft);
    border-radius: 4px;
    background-color: var(--color-paper-cream);
    box-shadow: 0 8px 18px rgba(46, 64, 96, 0.16);
    opacity: 0;
    visibility: hidden;
    transform: translate(-50%, 8px);
    transition: opacity 0.25s ease, transform 0.25s ease, visibility 0.25s ease;
}

.site-header__nav-item--has-depth:hover .site-header__depth-list {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
}

.site-header__depth-item + .site-header__depth-item {
    border-top: 1px solid var(--color-line-brown-soft);
}

.site-header__depth-link {
    display: block;
    padding: 10px 12px;
    font-family: var(--font-label);
    font-size: var(--font-size-body-small);
    color: var(--color-text-lead);
    text-align: center;
    white-space: nowrap;
    transition: color 0.2s ease, background-color 0.2s ease;
}

.site-header__depth-link:hover,
.site-header__depth-link:focus-visible {
    color: var(--color-brand-primary);
    background-color: var(--color-highlight-yellow);
    outline: none;
}

#project,
#project-uiux,
#project-design {
    scroll-margin-top: 80px;
}

.site-header__menu-button {
    display: none;
}