/* ============================================================
   GS YANG — portfolio
   Design language: drafting paper + ink + title-block annotation,
   drawn from the project spec sheets (Location / Role / Scale /
   Status) that already structure this site's real content.
   ============================================================ */

:root{
  --paper: #efeee9;
  --paper-raised: #f8f7f3;
  --ink: #17191a;
  --ink-soft: #3a3c35;
  --muted: #726f66;
  --rule: #d7d3c7;
  --rule-strong: #b8b3a4;
  --accent: #2f4858;
  --accent-soft: #dbe3e2;
  --accent-line: #7d97a0;

  --display: "Space Grotesk", "Arial Narrow", sans-serif;
  --body: "Inter", -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, "SFMono-Regular", monospace;

  --maxw: 1120px;
  --pad: clamp(20px, 4vw, 56px);
}

*, *::before, *::after{ box-sizing: border-box; }

html{ -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior: auto; }
  *, *::before, *::after{ animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

body{
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

a{ color: inherit; }

.wrap{
  max-width: var(--maxw);
  margin: 0 auto;
  padding-left: var(--pad);
  padding-right: var(--pad);
}

:focus-visible{
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

h1, h2, h3{
  font-family: var(--display);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.1;
  margin: 0;
}

.eyebrow{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
}

.lede{
  font-size: 18px;
  color: var(--ink-soft);
  max-width: 56ch;
}

/* ---------- header / nav ---------- */

.site-header{
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
  position: sticky;
  top: 0;
  z-index: 20;
}

.header-inner{
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand{
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.04em;
  text-decoration: none;
}
.brand-mark{ flex: 0 0 auto; }

.nav-toggle-input{ display: none; }

.nav-toggle-label{
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  margin: -8px;
}
.nav-toggle-label span,
.nav-toggle-label::before,
.nav-toggle-label::after{
  content: "";
  display: block;
  width: 22px;
  height: 2px;
  background: var(--ink);
}

.site-nav{
  display: flex;
  align-items: center;
  gap: 28px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.site-nav > a{
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
}
.site-nav > a:hover,
.site-nav > a[aria-current="page"]{
  border-bottom-color: var(--ink);
}

.nav-dropdown{ position: relative; }
.nav-dropdown > a::after{
  content: " \25BE";
  font-size: 10px;
}
.dropdown-panel{
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  margin-top: 12px;
  min-width: 176px;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  box-shadow: 0 8px 20px rgba(23,25,26,0.08);
  padding: 6px;
}
.nav-dropdown:hover .dropdown-panel,
.nav-dropdown:focus-within .dropdown-panel{
  display: block;
}
.dropdown-panel a{
  display: block;
  padding: 9px 12px;
  text-decoration: none;
  text-transform: none;
  letter-spacing: 0;
  font-family: var(--body);
  font-size: 14px;
}
.dropdown-panel a:hover{ background: var(--accent-soft); }

@media (max-width: 760px){
  .nav-toggle-label{ display: flex; }
  .site-nav{
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: var(--paper);
    border-bottom: 1px solid var(--rule);
    padding: 8px var(--pad) 20px;
  }
  .nav-toggle-input:checked ~ .site-nav{ display: flex; }
  .site-nav > a{ padding: 12px 0; border-bottom: 1px solid var(--rule); }
  .nav-dropdown{ display: flex; flex-direction: column; }
  .dropdown-panel{
    display: block;
    position: static;
    margin-top: 0;
    border: none;
    box-shadow: none;
    padding: 0 0 4px 14px;
  }
  .dropdown-panel a{ padding: 10px 0; font-size: 14px; }
}

/* ---------- home page: dark overlay header ---------- */

body.home .site-header{
  position: absolute;
  top: 0; left: 0; right: 0;
  background: transparent;
  border-bottom: none;
  z-index: 30;
}
body.home .brand,
body.home .site-nav > a{ color: #fff; text-shadow: 0 1px 4px rgba(0,0,0,0.45); }
body.home .site-nav > a:hover{ border-bottom-color: #fff; }
body.home .site-nav > a[aria-current="page"]{
  background: #111;
  padding: 9px 16px;
  border-bottom: none;
  text-shadow: none;
}
body.home .nav-toggle-label span,
body.home .nav-toggle-label::before,
body.home .nav-toggle-label::after{ background: #fff; }
body.home .dropdown-panel{ background: var(--paper-raised); }
body.home .dropdown-panel a{ color: var(--ink); text-transform: none; }
@media (max-width: 760px){
  body.home .site-nav{ background: #111; border-bottom: none; }
  body.home .site-nav > a{ border-bottom-color: rgba(255,255,255,0.16); }
}

/* ---------- home page: photo hero ---------- */

.photo-hero{
  position: relative;
  min-height: 100vh;
  overflow: hidden;
  padding: 0;
}
section.photo-hero + section{ border-top: none; }

.photo-hero-bg{
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-columns: minmax(230px, 34%) 1fr;
}
.photo-hero-panel{
  position: relative;
  background: #111210;
  overflow: hidden;
}
.dot-grid{
  position: absolute;
  inset: 0;
  background-image: radial-gradient(circle, rgba(255,255,255,0.22) 1.6px, transparent 1.7px);
  background-size: 52px 52px;
  background-position: 36px 90px;
  -webkit-mask-image: linear-gradient(to bottom, #000 0%, #000 42%, transparent 74%);
          mask-image: linear-gradient(to bottom, #000 0%, #000 42%, transparent 74%);
}
.photo-hero-image{ position: relative; background: #2a2a2a; }
.photo-hero-image img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: grayscale(1) contrast(1.05) brightness(1.02);
}
.photo-hero-image::after{
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(100deg, rgba(0,0,0,0.32) 0%, rgba(0,0,0,0.06) 30%, rgba(0,0,0,0) 55%);
}

.photo-hero-copy{
  position: absolute;
  left: 0; right: 0;
  top: 54%;
  transform: translateY(-50%);
  z-index: 2;
  color: #fff;
}
.eyebrow-italic{
  font-family: var(--body);
  font-style: italic;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: #f2f1ec;
  margin: 0 0 8px;
}
.photo-hero-name{
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(30px, 4.6vw, 46px);
  letter-spacing: 0.01em;
  color: #fff;
  margin: 0 0 28px;
  max-width: 14ch;
}
.tag-pill{
  display: inline-block;
  background: #8f8a2e;
  color: #fff;
  font-family: var(--body);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  padding: 17px 30px;
  margin: 0;
}

.scroll-cue{
  position: absolute;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
  color: #fff;
  font-size: 22px;
  text-decoration: none;
  line-height: 1;
  opacity: 0.85;
}
.scroll-cue:hover{ opacity: 1; }

@media (max-width: 820px){
  .photo-hero{ min-height: 78vh; }
  .photo-hero-bg{ grid-template-columns: 100%; }
  .photo-hero-panel{ display: none; }
  .photo-hero-image::after{
    background: linear-gradient(to top, rgba(0,0,0,0.6) 0%, rgba(0,0,0,0.18) 32%, rgba(0,0,0,0) 62%);
  }
  .photo-hero-copy{ padding-left: var(--pad); padding-right: var(--pad); top: auto; bottom: 56px; transform: none; }
  .photo-hero-name{ max-width: none; }
}
@media (min-width: 821px){
  .photo-hero-copy{ padding-left: var(--pad); }
}

/* ---------- title block (signature component) ---------- */

.title-block{
  border: 1px solid var(--ink);
  background: var(--paper-raised);
  display: grid;
  grid-template-columns: repeat(2, 1fr);
}
.title-block dt{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}
.title-block dd{
  margin: 4px 0 0;
  font-family: var(--body);
  font-size: 15px;
  font-weight: 500;
}
.title-block > div{
  padding: 16px 18px;
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
}
.title-block > div:nth-child(2n){ border-right: none; }
.title-block > div:nth-last-child(-n+2){ border-bottom: none; }

@media (max-width: 560px){
  .title-block{ grid-template-columns: 1fr; }
  .title-block > div{ border-right: none; }
  .title-block > div:nth-last-child(-n+2){ border-bottom: 1px solid var(--rule); }
  .title-block > div:last-child{ border-bottom: none; }
}

.status-dot{
  display: inline-block;
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--accent);
  margin-right: 7px;
}

/* ---------- buttons / links ---------- */

.btn{
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 12px 20px;
  border: 1px solid var(--ink);
  color: var(--ink);
  background: transparent;
  transition: background 120ms ease, color 120ms ease;
}
.btn:hover{ background: var(--ink); color: var(--paper); }
.btn-accent{ border-color: var(--accent); color: var(--accent); }
.btn-accent:hover{ background: var(--accent); color: var(--paper); }

.text-link{
  text-decoration-color: var(--rule-strong);
  text-underline-offset: 3px;
}
.text-link:hover{ text-decoration-color: var(--ink); }

/* ---------- sections / rhythm ---------- */

section{ padding-top: 72px; padding-bottom: 72px; }
section + section{ border-top: 1px solid var(--rule); }
.section-head{ margin-bottom: 36px; }

.hero{ padding-top: 64px; padding-bottom: 56px; }
.hero-grid{
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 48px;
  align-items: start;
}
.hero h1{
  font-size: clamp(40px, 6vw, 68px);
  margin-top: 18px;
}
@media (max-width: 820px){
  .hero-grid{ grid-template-columns: 1fr; }
}

/* ---------- news ---------- */

.news-row{
  display: flex;
  gap: 20px;
  align-items: baseline;
  padding: 18px 0;
  border-top: 1px solid var(--rule);
}
.news-row:last-child{ border-bottom: 1px solid var(--rule); }
.news-row .eyebrow{ flex: 0 0 auto; }

/* ---------- work grid ---------- */

.work-grid{
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.work-tile{
  background: var(--paper);
  padding: 32px 28px;
  text-decoration: none;
  color: var(--ink);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 168px;
  transition: background 140ms ease;
}
.work-tile:hover{ background: var(--paper-raised); }
.work-tile .num{
  font-family: var(--mono);
  font-size: 12px;
  color: var(--muted);
}
.work-tile h3{ font-size: 22px; margin-top: 14px; }
.work-tile .go{
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
}
@media (max-width: 620px){
  .work-grid{ grid-template-columns: 1fr; }
}

/* ---------- project cards (architecture) ---------- */

.project{
  padding: 40px 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 36px;
}
.project:last-child{ padding-bottom: 0; }
@media (max-width: 760px){
  .project{ grid-template-columns: 1fr; }
}
.project-specs{
  font-family: var(--mono);
  font-size: 12.5px;
  border-left: 2px solid var(--accent);
  padding-left: 16px;
}
.project-specs .pname{
  font-family: var(--display);
  font-size: 19px;
  color: var(--ink);
  margin-bottom: 12px;
  letter-spacing: 0;
  text-transform: none;
}
.project-specs dl{ margin: 0; }
.project-specs dt{ color: var(--muted); }
.project-specs dd{ margin: 0 0 10px; color: var(--ink-soft); }
.project-desc p{ margin: 0 0 14px; color: var(--ink-soft); }
.project-desc .img-slot{ margin-top: 18px; }

/* ---------- image placeholder slot ---------- */

.img-slot{
  aspect-ratio: 4 / 3;
  border: 1px dashed var(--rule-strong);
  background:
    repeating-linear-gradient(135deg, transparent 0 8px, var(--rule) 8px 9px);
  display: flex;
  align-items: flex-end;
  padding: 10px 12px;
}
.img-slot span{
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.04em;
  background: var(--paper);
  padding: 3px 7px;
  color: var(--muted);
  border: 1px solid var(--rule-strong);
}
.img-slot.wide{ aspect-ratio: 16 / 9; }
.img-slot.square{ aspect-ratio: 1 / 1; }

/* real photo, once you have one — same box proportions as .img-slot,
   just swap the div+span for this and an <img> (see README) */
.img-frame{
  aspect-ratio: 4 / 3;
  overflow: hidden;
  border: 1px solid var(--rule);
  background: var(--paper-raised);
}
.img-frame img{
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.img-frame.wide{ aspect-ratio: 16 / 9; }
.img-frame.square{ aspect-ratio: 1 / 1; }

.gallery{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}
@media (max-width: 760px){
  .gallery{ grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 480px){
  .gallery{ grid-template-columns: 1fr; }
}

.gallery-note{
  margin-top: 28px;
  padding: 16px 18px;
  background: var(--paper-raised);
  border: 1px solid var(--rule);
  font-size: 14px;
  color: var(--ink-soft);
}
.gallery-note code{
  font-family: var(--mono);
  background: var(--accent-soft);
  padding: 1px 5px;
  font-size: 12.5px;
}

.gallery .img-slot:has(img){
  aspect-ratio: auto;
  display: block;
  padding: 0;
  overflow: hidden;
  border-style: solid;
  border-color: var(--rule);
  background: var(--paper-raised);
  align-self: start;
}
.gallery .img-slot:has(img) img{
  width: 100%;
  height: auto;
  display: block;
}

/* ---------- about page ---------- */

.about-grid{
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
}
@media (max-width: 820px){
  .about-grid{ grid-template-columns: 1fr; }
}
.award-list{
  list-style: none;
  margin: 0;
  padding: 0;
}
.award-list li{
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 14px;
  padding: 11px 0;
  border-top: 1px solid var(--rule);
  font-size: 14.5px;
}
.award-list li:last-child{ border-bottom: 1px solid var(--rule); }
.award-year{
  font-family: var(--mono);
  color: var(--accent);
  font-size: 13px;
}

/* ---------- contact ---------- */

.contact-block{
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--ink);
}
.contact-block > div{
  padding: 28px;
  border-right: 1px solid var(--rule);
}
.contact-block > div:last-child{ border-right: none; }
@media (max-width: 700px){
  .contact-block{ grid-template-columns: 1fr; }
  .contact-block > div{ border-right: none; border-bottom: 1px solid var(--rule); }
  .contact-block > div:last-child{ border-bottom: none; }
}
.contact-block .eyebrow{ display: block; margin-bottom: 10px; }
.contact-block a{ text-decoration: none; }
.contact-block .val{ font-family: var(--display); font-size: 18px; word-break: break-word; }

/* ---------- footer ---------- */

.site-footer{
  border-top: 1px solid var(--rule);
  margin-top: 40px;
}
.footer-inner{
  padding-top: 28px;
  padding-bottom: 28px;
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  font-family: var(--mono);
  font-size: 12.5px;
  color: var(--muted);
}
.footer-inner a{ color: var(--muted); text-decoration: none; }
.footer-inner a:hover{ color: var(--ink); }

.copyright-note{
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 18px;
}

.back-link{
  display: inline-block;
  margin-bottom: 28px;
  font-family: var(--mono);
  font-size: 12.5px;
  text-decoration: none;
  color: var(--muted);
}
.back-link:hover{ color: var(--ink); }

/* ---------- student work: 左图右字 ---------- */

.student-project{
  display: grid;
  grid-template-columns: 1.3fr 1fr;
  gap: 48px;
  align-items: center;
  padding: 56px 0;
  border-top: 1px solid var(--rule);
}
.student-project:first-child{ border-top: none; padding-top: 0; }

.student-project .img-slot{
  overflow: hidden;
  border: 1px solid var(--rule);
  background: var(--paper-raised);
}
.student-project .img-slot img{
  width: 100%;
  height: auto;
  display: block;
}

.student-project .num{
  display: block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: 10px;
}
.student-project h2{
  font-size: 24px;
  margin: 0 0 18px;
}
.student-project p{
  color: var(--ink-soft);
  margin: 0 0 14px;
}
.student-project p:last-child{ margin-bottom: 0; }

@media (max-width: 820px){
  .student-project{ grid-template-columns: 1fr; gap: 22px; padding: 40px 0; }
}