:root {
  --background: #faf9f6;
  --surface: #f0f2ed;
  --text: #202e2b;
  --muted-text: #5b6661;
  --border: #d9ded7;
  --accent: #285b49;
  --accent-hover: #1c4436;
  --on-accent: #ffffff;
  --container-width: 1160px;
  --page-gutter: 24px;
  --section-spacing: 64px;
  --border-radius: 4px;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans KR", "Malgun Gothic", "Apple SD Gothic Neo", sans-serif;
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: clamp(1.35rem, 2.3vw, 1.75rem);
  --text-display: clamp(1.8rem, 3.2vw, 2.75rem);
  --line-height: 1.75;
  --anchor-offset: 24px;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; background: var(--background); color: var(--text); font-family: var(--font-sans); font-size: var(--text-base); line-height: var(--line-height); -webkit-text-size-adjust: 100%; }
h1, h2, h3, p, ul, dl, dd { margin: 0; }
h1, h2, h3 { line-height: 1.3; overflow-wrap: anywhere; }
p, dd { word-break: keep-all; overflow-wrap: anywhere; }
a { color: inherit; text-underline-offset: 0.25em; overflow-wrap: anywhere; }
button, input, textarea { font: inherit; }
img { display: block; max-width: 100%; height: auto; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
section[id], main[id] { scroll-margin-top: var(--anchor-offset); }
.container { width: min(var(--container-width), calc(100% - var(--page-gutter) * 2)); margin-inline: auto; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: absolute; top: 12px; left: 16px; z-index: 10; padding: 10px 16px; background: var(--text); color: white; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; top: 0; z-index: 5; border-bottom: 1px solid var(--border); background: var(--background); }
.js .header-inner { flex-direction: row; flex-wrap: wrap; align-items: center; justify-content: space-between; }
.menu-toggle { display: none; align-items: center; gap: 12px; min-width: 44px; min-height: 44px; padding: 8px 12px; border: 1px solid var(--accent); border-radius: var(--border-radius); background: transparent; color: var(--accent); cursor: pointer; font-size: var(--text-sm); }
.js .site-nav { position: absolute; top: 100%; left: 0; right: 0; max-height: calc(100dvh - 88px); overflow-y: auto; padding: 12px var(--page-gutter) 20px; border-bottom: 1px solid var(--border); background: var(--background); }
.js .site-nav ul { display: grid; gap: 4px; }
.js .site-nav a { width: 100%; padding-inline: 12px; }
.header-inner { display: flex; flex-direction: column; gap: 12px; padding-block: 20px 16px; }
.brand { display: inline-flex; align-items: center; min-height: 44px; align-self: center; font-size: var(--text-sm); font-weight: 750; letter-spacing: 0.08em; text-decoration: none; }
.brand-divider { color: var(--accent); margin-inline: 5px; }
.site-nav ul { display: flex; flex-wrap: wrap; align-items: center; gap: 2px 16px; padding: 0; list-style: none; }
.site-nav a { display: inline-flex; align-items: center; min-width: 44px; min-height: 44px; font-size: var(--text-sm); text-decoration: none; }
.site-nav a:hover, .site-nav a[aria-current="location"] { color: var(--accent); text-decoration: underline; text-decoration-thickness: 2px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 16px; padding: 12px 20px; border: 1px solid var(--accent); border-radius: var(--border-radius); background: var(--accent); color: var(--on-accent); font-weight: 600; text-decoration: none; }
.button-small { padding: 8px 16px; }
.site-nav .button:hover { background: var(--accent-hover); color: var(--on-accent); text-decoration: none; }
.button[aria-disabled="true"] { cursor: default; }
.hero { padding-block: clamp(32px, 4vw, 52px); }
.hero-identity { display: flex; flex-wrap: wrap; align-items: baseline; gap: 4px 20px; }
.hero-name { font-size: var(--text-lg); font-weight: 700; letter-spacing: 0.02em; }
.hero-role { color: var(--accent); font-size: var(--text-sm); font-weight: 500; }
.eyebrow { color: var(--accent); font-size: var(--text-xs); font-weight: 650; letter-spacing: 0.1em; text-transform: uppercase; }
.hero h1 { max-width: 1080px; margin-top: 20px; font-size: var(--text-display); line-height: 1.4; letter-spacing: -0.045em; word-break: keep-all; }
.hero-description { max-width: 860px; margin-top: 20px; color: var(--muted-text); font-size: var(--text-base); }
.hero-description p + p { margin-top: 8px; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 24px; }
.hero-actions .button { min-height: 44px; padding: 10px 20px; font-size: var(--text-sm); }
.button:hover { background: var(--accent-hover); }
.button-secondary { background: transparent; color: var(--accent); }
.button-secondary:hover { background: var(--surface); }
.section { padding-block: var(--section-spacing); border-top: 1px solid var(--border); }
.section-layout { display: grid; gap: 28px; }
.section-heading h2 { margin-top: 10px; font-size: var(--text-xl); font-weight: 650; letter-spacing: -0.025em; }
.section-body { min-width: 0; }
.section-intro { font-size: var(--text-lg); font-weight: 600; }
.placeholder { max-width: 640px; margin-top: 12px; color: var(--muted-text); }
.profile-section, .contact-section { background: var(--surface); }
.profile-section { padding-block: 20px; }
.profile-list { display: grid; gap: 12px; }
.profile-list > div { min-width: 0; padding-bottom: 12px; border-bottom: 1px solid var(--border); }
.profile-list > div:last-child { padding-bottom: 0; border-bottom: 0; }
.profile-list dt { color: var(--muted-text); font-size: var(--text-xs); }
.profile-list dd { margin-top: 4px; font-size: var(--text-sm); font-weight: 500; }
.competencies-section { padding-block: 32px 40px; }
.competencies-section .section-heading h2 { margin-top: 0; font-size: var(--text-sm); letter-spacing: 0.1em; }
.competency-grid { display: grid; gap: 24px; margin-top: 24px; }
.competency { display: flex; flex-direction: column; min-width: 0; padding-top: 12px; border-top: 2px solid var(--accent); }
.competency h3 { margin-top: 8px; font-size: var(--text-lg); font-weight: 650; line-height: 1.45; }
.competency-description { margin-block: 12px 20px; font-size: var(--text-sm); }
.competency-evidence { margin-top: 0; padding-top: 10px; border-top: 1px solid var(--border); }
.evidence-label { color: var(--accent); font-size: var(--text-xs); font-weight: 650; }
.evidence-placeholder { margin-top: 2px; color: var(--muted-text); font-size: var(--text-xs); }
.evidence-button { display: block; min-height: 44px; padding: 6px 0; border: 0; background: transparent; color: var(--accent); font: inherit; font-size: var(--text-sm); text-align: left; text-decoration: underline; text-underline-offset: 4px; overflow-wrap: anywhere; cursor: pointer; }
.card-result-scope { margin-top: 24px; color: var(--muted-text); font-size: var(--text-sm); }
.project-card > .case-metrics { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 16px; margin-top: 12px; }
/* A restrained line connects the ordered career narrative. */
.journey-timeline { margin: 32px 0 0; padding: 0; list-style: none; }
.journey-step { position: relative; min-width: 0; margin-left: 15px; padding: 0 0 32px 32px; border-left: 1px solid var(--border); }
.journey-step:last-child { padding-bottom: 0; border-left-color: transparent; }
.journey-step h3 { padding-top: 3px; font-size: var(--text-lg); line-height: 1.5; word-break: normal; }
.journey-step p { margin-top: 12px; color: var(--muted-text); font-size: var(--text-sm); }
.learning-column { min-width: 0; padding-top: 20px; border-top: 2px solid var(--accent); }
.learning-column h3 { color: var(--accent); font-size: var(--text-sm); letter-spacing: 0.06em; line-height: 1.6; }
.about-copy { max-width: 680px; }
.about-copy p + p { margin-top: 20px; }
.about-keywords { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 28px; padding: 20px 0 0; border-top: 1px solid var(--border); list-style: none; }
.about-keywords li { max-width: 100%; padding: 3px 9px; border-radius: var(--border-radius); background: var(--surface); color: var(--muted-text); font-size: var(--text-xs); overflow-wrap: anywhere; }
.project-grid { display: grid; align-items: start; gap: 24px; margin-top: 28px; }
.project-grid:empty { display: none; }
.project-card { position: relative; display: flex; flex-direction: column; min-width: 0; padding: 24px; border: 1px solid var(--border); border-top: 2px solid var(--accent); border-radius: var(--border-radius); }
.project-card:hover { border-color: var(--accent); }
.project-category { color: var(--accent); font-size: var(--text-xs); font-weight: 650; letter-spacing: 0.06em; text-transform: uppercase; }
.project-card h3 { margin-top: 12px; font-size: var(--text-xl); line-height: 1.4; }
.project-label { display: block; color: var(--accent); font-size: var(--text-xs); font-weight: 650; letter-spacing: 0.04em; text-transform: uppercase; }
.project-role { margin-top: 20px; font-size: var(--text-sm); }
.project-role .project-label { margin-bottom: 4px; }
.project-summary { margin-block: 16px 24px; color: var(--muted-text); font-size: var(--text-sm); }
.project-summary + .project-label { margin-top: auto; }
.project-skills { display: flex; flex-wrap: wrap; gap: 6px 12px; margin-top: 8px; padding: 0; list-style: none; }
.project-skills li { color: var(--muted-text); font-size: var(--text-xs); overflow-wrap: anywhere; }
.project-case-button, .additional-case-button { align-self: flex-start; min-height: 44px; margin-top: 24px; padding: 8px 0; border: 0; background: transparent; color: var(--accent); font-weight: 650; font-size: var(--text-sm); cursor: pointer; text-decoration: underline; text-underline-offset: 4px; }
.project-case-button::after { position: absolute; inset: 0; content: ""; }
.project-card:focus-within { outline: 2px solid var(--accent); outline-offset: 4px; }
.project-case-preview { position: relative; z-index: 1; margin-top: 12px; padding-top: 16px; border-top: 1px solid var(--border); color: var(--muted-text); font-size: var(--text-sm); }
.project-card-featured { grid-column: 1 / -1; border-top-width: 3px; }
.project-card-featured > .project-summary { max-width: 760px; }
.project-featured-label { font-weight: 750; }
.case-study { color: var(--text); font-size: var(--text-base); }
.project-dialog { width: calc(100% - 24px); max-width: 960px; max-height: calc(100dvh - 24px); margin: auto; padding: 0; border: 1px solid var(--border); border-radius: var(--border-radius); background: var(--background); color: var(--text); overflow: hidden; }
.project-dialog::backdrop { background: rgb(20 32 28 / 65%); }
.modal-shell { display: flex; flex-direction: column; max-height: calc(100dvh - 26px); }
.modal-toolbar { display: flex; flex-shrink: 0; align-items: center; justify-content: space-between; gap: 16px; padding: 12px 20px; border-bottom: 1px solid var(--border); }
.modal-close { min-height: 44px; padding: 8px 12px; border: 1px solid var(--border); border-radius: var(--border-radius); color: var(--accent); background: var(--background); cursor: pointer; }
.modal-close:hover { border-color: var(--accent); }
.modal-content { min-height: 0; overflow-y: auto; overscroll-behavior: contain; padding: 24px 20px; }
.modal-project-header { padding-bottom: 12px; }
.modal-title { margin-top: 12px; font-size: var(--text-xl); line-height: 1.4; }
.modal-role { margin-top: 16px; font-size: var(--text-sm); color: var(--muted-text); }
.case-subheading { margin: 16px 0 8px; font-size: var(--text-sm); color: var(--accent); }
.case-gallery { display: grid; grid-template-columns: minmax(0, 1fr); gap: 12px; min-width: 0; width: 100%; }
.gallery-viewport { min-width: 0; }
.gallery-image { min-width: 0; margin: 0; }
.gallery-frame { position: relative; width: 100%; aspect-ratio: 4 / 3; max-height: 60vh; overflow: hidden; border: 1px solid var(--border); border-radius: var(--border-radius); background: var(--surface); }
.gallery-image img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; }
.gallery-image figcaption { margin-top: 8px; color: var(--muted-text); font-size: var(--text-sm); overflow-wrap: anywhere; }
.gallery-controls { display: grid; grid-template-columns: 44px minmax(0, 1fr) 44px; align-items: center; gap: 12px; }
.gallery-button { min-width: 44px; min-height: 44px; padding: 8px; border: 1px solid var(--border); border-radius: var(--border-radius); background: var(--background); color: var(--accent); cursor: pointer; }
.gallery-button:hover { border-color: var(--accent); background: var(--surface); }
.gallery-counter { text-align: center; color: var(--muted-text); font-size: var(--text-sm); font-variant-numeric: tabular-nums; }
.case-section { padding-block: 24px; }
.case-section + .case-section { border-top: 1px solid var(--border); }
.case-heading { margin: 0 0 16px; color: var(--accent); font-size: var(--text-sm); line-height: 1.5; letter-spacing: 0.06em; overflow-wrap: anywhere; }
.case-section > p { max-width: 820px; }
.case-facts { display: grid; gap: 16px; margin-bottom: 20px; }
.case-facts dd { margin-top: 4px; font-size: var(--text-sm); }
.case-list { display: grid; gap: 8px; padding-left: 20px; margin-top: 12px; }
.case-list li { overflow-wrap: anywhere; word-break: keep-all; }
.case-list li::marker { color: var(--accent); }
.case-structure, .case-transferable { display: flex; flex-wrap: wrap; gap: 8px; padding: 0; margin-top: 20px; list-style: none; }
.case-structure li, .case-transferable li { padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--border-radius); font-size: var(--text-sm); overflow-wrap: anywhere; max-width: 100%; }
.case-result-scope { padding-left: 14px; border-left: 3px solid var(--accent); font-weight: 600; }
.case-metrics { display: grid; gap: 24px; margin-top: 24px; }
.case-metrics > div { display: flex; flex-direction: column; gap: 4px; min-width: 0; padding: 16px 0; border-top: 1px solid var(--border); }
.metric-label { color: var(--muted-text); font-size: var(--text-sm); overflow-wrap: anywhere; }
.metric-value { order: -1; color: var(--accent); font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 650; line-height: 1.3; }
@media (prefers-reduced-motion: no-preference) {
  .project-card, .button, .modal-close { transition: border-color 140ms ease, background-color 140ms ease; }
}
.site-footer { padding-block: 24px; border-top: 1px solid var(--border); color: var(--muted-text); font-size: var(--text-xs); }
.site-footer .container { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 8px 24px; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto !important; }
}

.js .menu-toggle { display: inline-flex; }


/* Bilingual headings keep English UI titles and Korean subtitles distinct. */
.title-ko { display: block; margin-top: 6px; color: var(--muted-text); font-size: var(--text-sm); font-weight: 500; letter-spacing: normal; line-height: 1.5; }
.term-en { display: block; margin-top: 3px; color: var(--muted-text); font-size: var(--text-xs); font-weight: 400; letter-spacing: normal; line-height: 1.5; overflow-wrap: anywhere; }
.journey-step::before { content: ""; position: absolute; top: 10px; left: -5px; width: 9px; height: 9px; border-radius: 50%; background: var(--accent); }

/* Expanded evidence remains readable without opening a case study. */
.evidence-list { display: grid; gap: 8px; margin-top: 10px; padding-left: 18px; font-size: var(--text-sm); }
.evidence-list li::marker { color: var(--accent); }
.competency-related:not(:empty) { margin-top: auto; padding-top: 20px; }
.journey-experiences { display: grid; gap: 20px; margin-top: 20px; }
.journey-experience { border-top: 1px solid var(--border); padding-top: 12px; }
.journey-experience h4 { font-size: var(--text-sm); line-height: 1.5; }
.journey-experience ul { margin-top: 8px; padding-left: 16px; color: var(--muted-text); font-size: var(--text-xs); }
.journey-step .journey-period { margin-top: 8px; color: var(--accent); font-size: var(--text-xs); font-variant-numeric: tabular-nums; }
.journey-step .journey-course { color: var(--text); font-weight: 650; }
.journey-step .journey-keyword { color: var(--accent); font-size: var(--text-xs); }

.additional-experience { margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--border); }
.additional-list { display: grid; gap: 24px; margin-top: 24px; }
.additional-item { min-width: 0; padding-top: 16px; border-top: 1px solid var(--border); font-size: var(--text-sm); }
.additional-item > p, .additional-item .case-gallery { margin-top: 12px; }
.project-period, .metric-detail { color: var(--muted-text); font-size: var(--text-xs); margin-top: 8px; }
.digital-results-heading { margin-top: 20px; font-weight: 650; color: var(--accent); }
.result-note { margin-top: 12px; font-size: var(--text-sm); }
.project-hero-image { margin: 0 0 20px; }
.project-hero-image img { width: 100%; aspect-ratio: 3 / 2; object-fit: cover; object-position: center; border-radius: var(--border-radius); }
.project-hero-image figcaption { margin-top: 6px; color: var(--muted-text); font-size: var(--text-xs); }
.modal-project-header .project-hero-image { margin-top: 20px; }
.modal-project-header .project-hero-image img { max-height: 65vh; aspect-ratio: auto; object-fit: contain; }
.research-process { display: flex; flex-wrap: wrap; gap: 12px 28px; padding-left: 20px; }

/* v2 tool evidence and clearly separated learning interests. */
.skills-groups, .learning-cards { display: grid; gap: 20px; margin-top: 28px; }
.skill-group, .learning-card { min-width: 0; padding: 24px; border: 1px solid var(--border); border-radius: var(--border-radius); }
.skill-group h3 { color: var(--accent); font-size: var(--text-sm); line-height: 1.5; }
.language-item { margin-top: 20px; }
.language-item + .language-item { padding-top: 16px; border-top: 1px solid var(--border); }
.language-item h4 { font-size: var(--text-base); }
.skill-level { margin-top: 16px; font-size: var(--text-sm); }
.skill-level .project-label { margin-bottom: 4px; }
.skill-tools { display: flex; flex-wrap: wrap; gap: 8px 16px; padding: 0; margin-top: 16px; list-style: none; font-size: var(--text-sm); }
.skill-evidence { margin-top: 16px; font-size: var(--text-sm); }
.skill-evidence > p + p { margin-top: 6px; }
.skill-evidence ul, .learning-card ul { display: grid; gap: 8px; margin-top: 12px; padding-left: 18px; font-size: var(--text-sm); }
#learning .learning-column { margin-top: 32px; }
.learning-bring-list { display: grid; gap: 20px; list-style: none; padding: 0; margin-top: 20px; font-size: var(--text-sm); }
.learning-note { margin-top: 12px; color: var(--muted-text); font-size: var(--text-sm); }
.learning-card h4 { margin-top: 12px; font-size: var(--text-base); line-height: 1.5; }

.contact-details { display: grid; gap: 24px; }
.contact-details dt { color: var(--muted-text); font-size: var(--text-sm); }
.contact-details a { display: inline-flex; align-items: center; min-height: 44px; max-width: 100%; overflow-wrap: anywhere; text-underline-offset: 4px; }
.footer-note { flex-basis: 100%; margin-top: 12px; max-width: 760px; font-size: var(--text-xs); line-height: 1.65; }
.footer-note p + p { margin-top: 8px; }

.project-recognition { margin-top: 16px; color: var(--accent); font-size: var(--text-sm); font-weight: 600; }
.thesis-process { display: grid; gap: 12px; margin: 20px 0 0; padding-left: 24px; }
.thesis-process li { padding-left: 8px; border-left: 1px solid var(--border); font-size: var(--text-sm); overflow-wrap: anywhere; }
.thesis-process li::marker { color: var(--accent); }