:root {
    --bg: #ffffff;
    --text: #111111;
    --muted: #6b6b6b;
    --divider: #eaeaea;
    --max-width: 1180px;
    --pad-desktop: 32px;
    --pad-mobile: 20px;
    --layout-gap: 36px;
    --layout-gap-tablet: 28px;
    --layout-gap-mobile: 20px;
    --section-gap: 24px;
    --sidebar-gap: 18px;
}

* {
    box-sizing: border-box;
}

body {
    margin: 0;
    font-family: "Pretendard", "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", system-ui, sans-serif;
    font-size: 16px;
    line-height: 1.7;
    background: var(--bg);
    color: var(--text);
    -webkit-font-smoothing: antialiased;
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

a {
    color: inherit;
    text-decoration: underline;
    text-decoration-color: transparent;
    text-decoration-thickness: 1px;
    text-underline-offset: 3px;
    transition: opacity 0.2s ease, text-decoration-color 0.2s ease;
}

a:hover {
    opacity: 0.75;
    text-decoration-color: currentColor;
}

button {
    font-family: inherit;
}

.container {
    max-width: var(--max-width);
    margin: 0 auto 72px;
    padding: 0 var(--pad-desktop);
    width: 100%;
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--pad-mobile);
        margin-bottom: 56px;
    }
}

.nav-shell,
.topnav {
    width: 100%;
    border-bottom: 1px solid var(--divider);
    background: var(--bg);
}

.nav-inner {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 18px var(--pad-desktop);
    display: flex;
    align-items: center;
    gap: 24px;
    flex-wrap: wrap;
}

@media (max-width: 768px) {
    .nav-inner {
        padding: 16px var(--pad-mobile);
    }
}

.nav-logo {
    font-weight: 700;
    letter-spacing: 0.12em;
    text-transform: uppercase;
    font-size: 13px;
}

.nav-shell nav,
.topnav nav {
    display: flex;
    gap: 14px;
    flex-wrap: wrap;
}

.nav-shell nav a,
.topnav nav a {
    text-decoration: none;
    color: var(--text);
    font-weight: 500;
    padding-bottom: 6px;
    border-bottom: 1px solid transparent;
    opacity: 0.78;
    transition: opacity 0.2s ease, border-color 0.2s ease;
}

.nav-shell nav a:hover,
.topnav nav a:hover {
    opacity: 1;
    border-color: var(--text);
}

.nav-shell nav a.active,
.topnav nav a.active {
    opacity: 1;
    border-color: var(--text);
    font-weight: 600;
}

.lang-switch {
    display: flex;
    gap: 10px;
    margin-left: auto;
    align-items: center;
}

.lang-switch button {
    background: none;
    border: none;
    padding: 6px 0;
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--text);
    opacity: 0.55;
    border-bottom: 1px solid transparent;
    cursor: pointer;
    transition: opacity 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.lang-switch button:hover {
    opacity: 0.85;
}

.lang-switch button.active {
    opacity: 1;
    border-color: var(--text);
    font-weight: 600;
}

main {
    padding-top: 12px;
}

.hero {
    padding: 36px 0 26px;
    display: flex;
    align-items: center;
    gap: 22px;
    border-bottom: 1px solid var(--divider);
}

.hero .avatar {
    width: 180px;
    height: 270px;
    border-radius: 12px;
    overflow: hidden;
    flex-shrink: 0;
    background: var(--bg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.hero .avatar img {
    width: 100%;
    height: 100%;
    object-fit: contain;
    object-position: center;
}

.hero .identity {
    display: flex;
    flex-direction: column;
    gap: 6px;
}

.hero h1 {
    margin: 0;
    font-size: clamp(44px, 5vw, 56px);
    font-weight: 800;
    letter-spacing: -0.02em;
}

.hero h3 {
    margin: 0;
    font-size: 16px;
    color: var(--muted);
    font-weight: 500;
}

.section-label {
    font-size: 12px;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin: 0 0 10px;
}

.page-resume .content-area .section-label {
    display: inline-flex;
    align-items: center;
    padding: 10px 12px;
    border: 1px solid var(--divider);
    border-radius: 8px;
    margin-bottom: 14px;
    background: var(--bg);
    font-size: 13px;
    font-weight: 600;
}

.section-heading {
    margin: 0 0 10px;
    font-size: 18px;
    letter-spacing: -0.01em;
}

.section-stack {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.meta-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin: 0;
    padding: 0;
    list-style: none;
}

.meta-item span {
    display: block;
    color: var(--muted);
    font-size: 13px;
    letter-spacing: 0.04em;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.meta-item strong,
.meta-item div {
    font-weight: 600;
    font-size: 15px;
}

.main-grid {
    display: grid;
    grid-template-columns: minmax(260px, 1fr) minmax(520px, 2fr);
    grid-template-areas: "sidebar content";
    gap: var(--layout-gap);
    padding: 32px 0 0;
    align-items: start;
}

.sidebar {
    grid-area: sidebar;
    display: flex;
    flex-direction: column;
    gap: var(--sidebar-gap);
}

.sidebar .section-block {
    margin: 0;
}

.sidebar .section-block:first-child {
    border-top: none;
    padding-top: 0;
}

.sidebar__profile,
.sidebar__education,
.sidebar__contact {
    width: 100%;
}

.content-area {
    grid-area: content;
    display: flex;
    flex-direction: column;
    gap: var(--section-gap);
}

.content-stack {
    display: flex;
    flex-direction: column;
    gap: var(--section-gap);
}

.section-block {
    padding-top: 6px;
    border-top: 1px solid var(--divider);
}

.section-block:first-child {
    border-top: none;
    padding-top: 0;
}

.section-block p,
.section-block li {
    margin: 0 0 8px;
    color: var(--text);
}

.section-block ul,
.section-block ol {
    padding-left: 18px;
    margin: 0;
}

.resume-timeline {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.resume-entry {
    border-top: 1px solid var(--divider);
    padding-top: 12px;
}

.resume-entry:first-child {
    border-top: none;
    padding-top: 0;
}

.resume-entry strong {
    display: block;
    font-weight: 650;
    margin-bottom: 4px;
}

.resume-entry span {
    color: var(--muted);
    font-size: 14px;
}

.filter-controls {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
    margin: 8px 0 16px;
}

.filter-controls button {
    background: none;
    border: none;
    padding: 4px 0;
    font-weight: 500;
    color: var(--muted);
    border-bottom: 1px solid transparent;
    cursor: pointer;
    transition: opacity 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.filter-controls button:hover {
    color: var(--text);
    opacity: 0.85;
}

.filter-controls button.active {
    color: var(--text);
    border-color: var(--text);
    font-weight: 600;
    opacity: 1;
}

.work-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 14px;
}

.work-card {
    display: flex;
    flex-direction: column;
    gap: 10px;
    padding: 12px 0;
    border-top: 1px solid var(--divider);
    text-decoration: none;
    color: inherit;
}

.work-card:first-child {
    border-top: 1px solid var(--divider);
}

.work-card img {
    width: 100%;
    height: 210px;
    object-fit: cover;
    border: 1px solid var(--divider);
    border-radius: 6px;
}

.work-card-body {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.work-card h4 {
    margin: 0;
    font-size: 16px;
    font-weight: 700;
    letter-spacing: -0.01em;
}

.work-secondary {
    margin: 0;
    font-size: 14px;
    color: var(--muted);
}

.work-date {
    margin: 0;
    font-size: 12px;
    letter-spacing: 0.08em;
    color: var(--muted);
    text-transform: uppercase;
}

.page-section {
    padding: 0;
    border: none;
}

.cta-row {
    display: flex;
    flex-wrap: wrap;
    gap: 12px;
    margin-top: 12px;
}

.btn {
    padding: 10px 16px;
    border-radius: 6px;
    border: 1px solid var(--divider);
    font-weight: 600;
    cursor: pointer;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    color: var(--text);
    transition: opacity 0.2s ease, border-color 0.2s ease;
}

.btn:hover {
    opacity: 0.8;
    border-color: var(--text);
}

.btn-primary {
    border-color: var(--text);
}

.btn-ghost {
    border-color: var(--divider);
}

.contact-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 12px;
}

.contact-card {
    border: 1px solid var(--divider);
    padding: 14px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.contact-form {
    display: grid;
    gap: 10px;
}

.contact-form input,
.contact-form textarea {
    padding: 12px 14px;
    border: 1px solid var(--divider);
    font-family: inherit;
    font-size: 15px;
    resize: vertical;
    background: transparent;
}

.header.detail-header {
    background: var(--bg);
    padding: 20px 0;
    border-bottom: 1px solid var(--divider);
    text-align: left;
}

.detail-body {
    padding: 24px 0;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.footer {
    text-align: center;
    font-size: 12px;
    padding: 20px 0 40px;
    color: var(--muted);
    border-top: 1px solid var(--divider);
    margin-top: 40px;
}

@media (max-width: 1023px) {
    .nav-inner {
        gap: 16px;
    }

    .hero {
        padding: 28px 0 20px;
    }

    .main-grid {
        grid-template-columns: minmax(240px, 1fr) minmax(420px, 1.6fr);
        gap: var(--layout-gap-tablet);
    }
}

@media (max-width: 767px) {
    .nav-inner {
        flex-direction: column;
        align-items: flex-start;
    }

    .lang-switch {
        margin-left: 0;
    }

    .hero {
        flex-direction: row;
        align-items: center;
        padding: 24px 0 18px;
        gap: 16px;
    }

    .hero .avatar {
        width: 135px;
        height: 135px;
    }

    .main-grid {
        grid-template-columns: 1fr;
        grid-template-areas:
            "sidebar"
            "content";
        gap: var(--layout-gap-mobile);
        padding-top: 20px;
    }

    .sidebar {
        gap: 14px;
        border-bottom: 1px solid var(--divider);
        padding-bottom: 12px;
        margin-bottom: 12px;
    }

    .hide-mobile {
        display: none !important;
    }

    .page-index .sidebar__contact,
    .page-resume .sidebar__contact {
        display: none !important;
    }

    .page-portfolio .sidebar {
        display: none;
    }

    .page-contact .sidebar__profile,
    .page-contact .sidebar__education {
        display: none !important;
    }
}