/* =========================================================
   Seongwoong Shim — personal site
   Proportions and typography follow the al-folio layout:
   930px container (900px content), Roboto 300, 40/32px light
   headings, 22% floated profile photo, 2/12 + 8/12 publication rows.
   ========================================================= */

:root {
  --bg:      #ffffff;
  --text:    #000000;
  --muted:   #4f4f4f;
  --faint:   #828282;
  --rule:    #e5e5e5;
  --link:    #3a6bbf;      /* hyperlinks */
  --link-u:  rgba(58, 107, 191, .28);
  --code-bg: #f5f5f5;
  --thumb-ratio: 4 / 3;    /* publication thumbnails: 1 / 1 or 16 / 9 also work */
  color-scheme: light;
}

:root[data-theme="dark"] {
  --bg:      #1c1c1d;
  --text:    #e8e8e8;
  --muted:   #b0b0b0;
  --faint:   #8e8e8e;
  --rule:    #333436;
  --link:    #8fabdd;
  --link-u:  rgba(143, 171, 221, .35);
  --code-bg: #262728;
  color-scheme: dark;
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html { scroll-behavior: smooth; scroll-padding-top: 72px; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Roboto", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.5;                /* 24px, as on the reference site */
}

a {
  color: var(--link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-decoration-color: var(--link-u);
  text-underline-offset: 3px;
  transition: text-decoration-color .12s ease;
}
a:hover { text-decoration-color: var(--link); }

/* links that are already their own affordance keep the plain treatment */
.navbar a, .btn { text-decoration: none; }
.navbar nav a { color: var(--text); font-weight: 400; }
.navbar nav a:hover { color: var(--link); }

strong, b { font-weight: 600; }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: .85em; background: var(--code-bg);
  border-radius: 3px; padding: .1em .35em;
}

/* ───────── container: 930px incl. 15px gutters ───────── */
.container { max-width: 930px; margin: 0 auto; padding-left: 15px; padding-right: 15px; }
.mt-5 { margin-top: 48px; }

/* ───────── navbar ───────── */
.navbar {
  position: sticky; top: 0; z-index: 10;
  background: var(--bg); border-bottom: 1px solid var(--rule);
}
.navbar .container { display: flex; align-items: center; gap: 16px; height: 57px; }
.navbar-brand { font-size: 16px; font-weight: 500; color: var(--text); white-space: nowrap; }
.navbar-brand:hover { text-decoration: none; }
.navbar nav { margin-left: auto; display: flex; gap: 18px; }
.navbar nav a { font-size: 16px; }
.theme-btn {
  display: inline-grid; place-items: center; flex: none;
  width: 30px; height: 30px; padding: 0; cursor: pointer;
  background: none; border: 1px solid var(--rule); border-radius: 2px; color: var(--muted);
}
.theme-btn:hover { color: var(--text); }

/* ───────── headings ───────── */
h1 { font-size: 40px; font-weight: 700; line-height: 1.15; margin: 0 0 8px; letter-spacing: -.01em; }
h2 { font-size: 32px; font-weight: 300; line-height: 1.2;  margin: 0 0 8px; }
h3 { font-size: 24px; font-weight: 300; line-height: 1.25; margin: 32px 0 8px; }

p { margin: 0 0 16px; }

/* ───────── about / profile ───────── */
/* the text column and the photo start and end on the same line */
.about-row { display: flex; align-items: stretch; gap: 1rem; }
.about-text { flex: 1 1 auto; min-width: 0; display: flex; flex-direction: column; }
.about-text > *:last-child { margin-bottom: 0; }

.desc { color: var(--muted); margin-bottom: 20px; }


.profile { position: relative; flex: 0 0 22%; max-width: 22%; }   /* 198 / 900, as on the reference site */
/* the figure is taken out of flow so the photo can never change the row's height:
   the text column decides it, the photo fills it (centre-cropped) */
.profile figure { position: absolute; inset: 0; margin: 0; }
.profile img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; display: block; }
.profile-placeholder {
  position: absolute; inset: 0;
  background: var(--code-bg); border: 1px solid var(--rule);
  display: grid; align-content: center; justify-items: center; gap: 6px;
  text-align: center; padding: 0 8px;
}
.profile-initials { font-size: 28px; font-weight: 400; color: var(--faint); }
.profile-hint {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 10px; color: var(--faint); word-break: break-all; line-height: 1.3;
}

.contact { margin: 0 0 6px; }
.contact-label { color: var(--muted); }
.socials { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 4px 20px; }


/* ───────── research interest ───────── */
.interest-list { margin: 0; padding-left: 20px; }
.interest-list li { margin-bottom: 6px; }
.interest-list strong { font-weight: 600; }

/* ───────── publications (3/12 thumbnail + 9/12 text) ───────── */
.legend { color: var(--muted); margin: 0 0 24px; font-size: 14px; }

.publications { list-style: none; margin: 32px 0 0; padding: 0; }
.publications li { margin: 0 0 20px; padding: 0; }

.row { display: flex; margin-left: -15px; margin-right: -15px; }
.col-thumb { flex: 0 0 25%; max-width: 25%; padding: 0 15px; }
.col-body  { flex: 0 0 75%; max-width: 75%; padding: 0 15px; }

/* fixed-ratio frame; the image covers it, the venue text sits behind as a fallback */
.thumb {
  position: relative; width: 100%; aspect-ratio: var(--thumb-ratio);
  overflow: hidden; border-radius: 3px;
  border: 1px solid var(--rule); background: var(--code-bg);
  display: grid; place-items: center;
}
.thumb img {
  position: absolute; inset: 0; width: 100%; height: 100%;
  object-fit: cover; display: block; z-index: 1;
}
.thumb-fallback {
  font-size: 12px; font-weight: 500; letter-spacing: .02em;
  color: var(--faint); text-align: center; padding: 0 8px;
}

.pub-id { color: var(--faint); font-weight: 400; margin-right: 6px; }
.title { font-size: 16px; font-weight: 500; }
.author { font-size: 16px; font-weight: 400; }
.author .me { font-weight: 600; text-decoration: underline; text-underline-offset: 2px; }
.periodical { font-size: 16px; font-weight: 400; }
.periodical em { font-style: italic; }
.links { margin-top: 6px; display: flex; flex-wrap: wrap; gap: 6px; }
.btn {
  display: inline-flex; align-items: center; gap: 5px;
  font-size: 10.24px; line-height: 1.5; font-weight: 500;
  padding: 4px 12px 4px 10px; border: 1px solid var(--text); border-radius: 2px;
  color: var(--text); background: none; text-transform: none;
}
.btn svg { flex: none; width: 12px; height: 12px; }
.btn:hover { background: var(--text); color: var(--bg); text-decoration: none; }

/* ───────── footer ───────── */
.footer {
  margin-top: 56px; border-top: 1px solid var(--rule);
  color: var(--faint); font-size: 14px;
}
.footer .container {
  display: flex; flex-wrap: wrap; gap: 4px 18px;
  justify-content: space-between; padding-top: 18px; padding-bottom: 32px;
}

/* ───────── responsive ───────── */
@media (max-width: 767px) {
  .row { flex-direction: column; }
  .col-thumb, .col-body { flex: 1 1 auto; max-width: 100%; }
  .col-thumb { margin-bottom: 8px; }
  .thumb { max-width: none; }
}
@media (max-width: 575px) {
  h1 { font-size: 32px; text-align: center; }
  h2 { font-size: 26px; }
  h3 { font-size: 21px; }
  /* phone: name, photo and the subtitle line are centred; the bio is justified */
  .about-row { flex-direction: column-reverse; gap: 20px; }
  .profile { flex: none; width: 60%; max-width: 220px; aspect-ratio: 270 / 347; margin: 0 auto; }
  .desc { text-align: center; }
  .about-text > p:not(.desc):not(.contact) { text-align: justify; hyphens: auto; -webkit-hyphens: auto; }
  .contact { text-align: center; }
  .socials { justify-content: center; }
  .navbar nav { gap: 14px; }
}
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }