/* index.html, projects.html 공통: 헤더, 모바일 메뉴, 푸터, 스크롤 진행 버튼 */

html[lang="en"] [data-lang="ko"],
html:not([lang="en"]) [data-lang="en"] {
    display: none !important;
}

.site-header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 50;
    width: 100%;
    height: 72px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    padding: 0 6vw;
    background: rgba(7, 17, 31, 0.82);
    backdrop-filter: blur(16px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.12);
}

.logo img {
    width: 63px;
    height: auto;
    display: block;
}

.site-nav {
    display: flex;
    gap: 10px;
}

.site-nav button,
.site-nav a {
    border: 0;
    color: rgba(255, 255, 255, 0.82);
    background: transparent;
    padding: 10px 12px;
    border-radius: 999px;
    font: inherit;
    text-decoration: none;
    white-space: nowrap;
    cursor: pointer;
    transition: 0.2s ease;
}

.site-nav button:hover,
.site-nav a:hover {
    color: #ffffff;
    background: rgba(255, 255, 255, 0.12);
}

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

.control-btn {
    min-width: 58px;
    height: 36px;
    padding: 0 12px;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 999px;
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
    font: inherit;
    cursor: pointer;
    transition: 0.2s ease;
}

.control-btn:hover {
    background: rgba(255, 255, 255, 0.18);
}

.menu-toggle {
    display: none;
    width: 40px;
    height: 36px;
    padding: 0;
    border: 1px solid rgba(255, 255, 255, 0.24);
    border-radius: 10px;
    color: #ffffff;
    background: rgba(255, 255, 255, 0.1);
    cursor: pointer;
}

.menu-toggle svg {
    width: 20px;
    height: 20px;
    display: block;
    margin: 0 auto;
}

.nav-backdrop {
    display: none;
}

.scroll-top {
    position: fixed;
    right: 22px;
    bottom: 22px;
    z-index: 40;
    width: 52px;
    height: 52px;
    padding: 0;
    border: 0;
    border-radius: 50%;
    color: var(--ink);
    background: var(--white);
    box-shadow: var(--shadow);
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(8px);
    transition: 0.2s ease;
}

body.dark-mode .scroll-top {
    color: #ffffff;
    background: #1c2b44;
}

.scroll-top.visible {
    opacity: 1;
    visibility: visible;
    transform: none;
}

.scroll-top-ring {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    transform: rotate(-90deg);
}

.scroll-top-ring circle {
    fill: none;
    stroke-width: 3;
}

.scroll-top-track {
    stroke: var(--line);
}

.scroll-top-bar {
    stroke: var(--blue);
    stroke-linecap: round;
}

.scroll-top-arrow {
    position: relative;
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 2.4;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.site-footer {
    padding: 48px 6vw 28px;
    color: rgba(255, 255, 255, 0.72);
    background: #07111f;
    border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-inner {
    width: min(1120px, 100%);
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 24px;
    flex-wrap: wrap;
}

.footer-brand {
    display: flex;
    align-items: center;
    gap: 16px;
}

.footer-brand img {
    width: 52px;
    height: auto;
}

.footer-brand strong {
    display: block;
    color: #ffffff;
    font-size: 18px;
}

.footer-brand p,
.footer-copy {
    margin: 0;
    font-size: 14px;
}

.footer-contact a {
    color: #ffffff;
    text-decoration: none;
}

.footer-contact a:hover {
    text-decoration: underline;
}

.footer-links {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
}

.footer-links a {
    padding: 8px 14px;
    border: 1px solid rgba(255, 255, 255, 0.18);
    border-radius: 999px;
    color: #ffffff;
    font-size: 14px;
    text-decoration: none;
    transition: 0.2s ease;
}

.footer-links a:hover {
    background: rgba(255, 255, 255, 0.12);
}

.footer-copy {
    width: min(1120px, 100%);
    margin: 32px auto 0;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 13px;
}

@media (max-width: 1199px) {
    .site-nav {
        gap: 2px;
    }

    .site-nav button,
    .site-nav a {
        padding: 8px 9px;
    }
}

@media (max-width: 767px) {
    .site-header {
        height: 64px;
        padding: 0 16px;
        /* backdrop-filter가 있으면 fixed 메뉴가 헤더 기준으로 잡혀서 끔 */
        backdrop-filter: none;
        background: rgba(7, 17, 31, 0.96);
    }

    .global-controls {
        margin-left: auto;
    }

    .control-btn {
        min-width: 50px;
        height: 34px;
        padding: 0 10px;
        font-size: 14px;
    }

    .menu-toggle {
        display: block;
    }

    .site-nav {
        position: fixed;
        top: 0;
        right: 0;
        z-index: 60;
        width: min(78vw, 300px);
        height: 100vh;
        padding: 84px 20px 24px;
        flex-direction: column;
        gap: 4px;
        background: #07111f;
        border-left: 1px solid rgba(255, 255, 255, 0.12);
        transform: translateX(100%);
        transition: transform 0.25s ease;
    }

    .site-nav button,
    .site-nav a {
        width: 100%;
        padding: 14px 16px;
        border-radius: 10px;
        text-align: left;
        font-size: 16px;
    }

    body.nav-open .site-nav {
        transform: none;
    }

    body.nav-open .nav-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 55;
        background: rgba(0, 0, 0, 0.5);
    }

    body.nav-open .menu-toggle {
        position: relative;
        z-index: 61;
    }

    .scroll-top {
        right: 16px;
        bottom: 16px;
        width: 46px;
        height: 46px;
    }

    .site-footer {
        padding: 40px 20px 24px;
    }
}