/* ─────────────────────────────────────────────
   Wonmin Kim — Portfolio
   Design: editorial, refined minimalism
───────────────────────────────────────────── */

:root {
  --bg: #F4F1EA;
  --bg-alt: #EDE7DA;
  --paper: #FAF8F2;
  --text: #1A1A17;
  --text-muted: #6B6760;
  --text-dim: #908A80;
  --accent: #8B3A1F;
  --accent-soft: #A85A3A;
  --line: #D4CDBE;
  --line-soft: #E5DFD2;

  --display: 'Fraunces', 'Source Serif 4', Georgia, serif;
  --body: 'Source Serif 4', Georgia, serif;
  --mono: ui-monospace, 'SF Mono', Menlo, monospace;

  --max-width: 1240px;
  --gutter: clamp(1.5rem, 5vw, 4rem);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 1.0625rem;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

::selection {
  background: var(--accent);
  color: var(--paper);
}

/* ─── Typography ─────────────────────────────── */

h1, h2, h3, h4 {
  font-family: var(--display);
  font-weight: 400;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--text);
}

h1 {
  font-size: clamp(3rem, 9vw, 8rem);
  font-variation-settings: 'opsz' 144, 'SOFT' 50;
  font-weight: 300;
  letter-spacing: -0.045em;
  line-height: 0.92;
}

h2 {
  font-size: clamp(2rem, 5vw, 3.75rem);
  font-variation-settings: 'opsz' 96;
  font-weight: 400;
  letter-spacing: -0.025em;
}

h3 {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-variation-settings: 'opsz' 36;
  font-weight: 500;
}

h4 {
  font-size: 1.125rem;
  font-weight: 600;
  font-family: var(--body);
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.78rem;
  color: var(--text-muted);
}

p {
  margin-bottom: 1.2rem;
  max-width: 62ch;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  transition: opacity 0.2s ease;
}

a:hover {
  opacity: 0.6;
}

em {
  font-family: var(--display);
  font-style: italic;
  font-variation-settings: 'opsz' 36;
}

/* ─── Layout primitives ──────────────────────── */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.section {
  padding: 8rem 0;
  position: relative;
}

.section--narrow {
  padding: 5rem 0;
}

/* ─── Header / Navigation ────────────────────── */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 1.5rem var(--gutter);
  background: rgba(244, 241, 234, 0.85);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line-soft);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.85rem;
}

.site-header__brand {
  font-family: var(--display);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: -0.01em;
  color: var(--text);
  border: none;
}

.site-header__nav {
  display: flex;
  gap: 2.5rem;
}

.site-header__nav a {
  color: var(--text-muted);
  border: none;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.site-header__nav a:hover {
  color: var(--accent);
  opacity: 1;
}

@media (max-width: 700px) {
  .site-header__nav {
    gap: 1.25rem;
    font-size: 0.78rem;
  }
}

/* ─── Hero ───────────────────────────────────── */

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 8rem 0 6rem;
  position: relative;
  overflow: hidden;
}

.hero__inner {
  position: relative;
  width: 100%;
}

.hero__meta {
  display: flex;
  align-items: center;
  gap: 1rem;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.18em;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
  font-weight: 500;
}

.hero__meta::before {
  content: '';
  width: 2.5rem;
  height: 1px;
  background: var(--accent);
}

.hero__title {
  margin-bottom: 2.5rem;
  max-width: 14ch;
}

.hero__title .accent {
  font-style: italic;
  color: var(--accent);
  font-weight: 400;
}

.hero__lede {
  font-size: clamp(1.15rem, 1.8vw, 1.5rem);
  line-height: 1.5;
  max-width: 42ch;
  color: var(--text);
  font-weight: 400;
  margin-top: 3rem;
}

.hero__lede strong {
  font-weight: 600;
  color: var(--text);
}

.hero__corner {
  position: absolute;
  top: 6rem;
  right: 0;
  text-align: right;
  font-size: 0.78rem;
  color: var(--text-dim);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  line-height: 1.8;
  font-weight: 500;
}

@media (max-width: 800px) {
  .hero__corner { display: none; }
}

.hero__divider {
  margin-top: 5rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  border-top: 1px solid var(--line);
  padding-top: 1.25rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

.hero__divider strong {
  color: var(--text);
  font-weight: 500;
}

/* ─── Section heading ────────────────────────── */

.section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 2rem;
  align-items: baseline;
  margin-bottom: 4rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--line);
}

.section-head__num {
  font-family: var(--display);
  font-size: 1rem;
  color: var(--accent);
  font-variation-settings: 'opsz' 14;
  letter-spacing: 0.05em;
  font-weight: 500;
  white-space: nowrap;
}

.section-head__title {
  font-size: clamp(1.5rem, 3vw, 2.5rem);
  margin: 0;
}

/* ─── About ──────────────────────────────────── */

.about {
  background: var(--bg);
}

.about__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6rem;
  align-items: start;
}

@media (max-width: 900px) {
  .about__grid {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

.about__text p {
  font-size: 1.125rem;
  line-height: 1.7;
}

.about__text p + p {
  margin-top: 1.25rem;
}

.about__quote {
  font-family: var(--display);
  font-style: italic;
  font-size: clamp(1.5rem, 2.5vw, 2.25rem);
  line-height: 1.3;
  color: var(--accent);
  font-variation-settings: 'opsz' 60;
  font-weight: 400;
  padding-left: 2rem;
  border-left: 2px solid var(--accent);
  margin: 2rem 0;
}

.about__sidebar {
  position: sticky;
  top: 8rem;
}

.about__detail {
  border-top: 1px solid var(--line);
  padding: 1.25rem 0;
  display: grid;
  grid-template-columns: 9rem 1fr;
  gap: 1.5rem;
  font-size: 0.95rem;
}

.about__detail:last-child {
  border-bottom: 1px solid var(--line);
}

.about__detail dt {
  color: var(--text-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 600;
  padding-top: 0.2rem;
}

.about__detail dd {
  color: var(--text);
}

.about__detail dd em {
  color: var(--text-muted);
  font-size: 0.85rem;
  display: block;
  margin-top: 0.2rem;
}

/* ─── Projects ───────────────────────────────── */

.projects {
  background: var(--paper);
  position: relative;
}

.project {
  display: grid;
  grid-template-columns: 8rem 1fr 1fr;
  gap: 3rem;
  padding: 4rem 0;
  border-top: 1px solid var(--line);
  align-items: start;
}

.project:last-of-type {
  border-bottom: 1px solid var(--line);
}

@media (max-width: 900px) {
  .project {
    grid-template-columns: 1fr;
    gap: 1.5rem;
    padding: 3rem 0;
  }
}

.project__num {
  font-family: var(--display);
  font-size: 0.9rem;
  letter-spacing: 0.1em;
  color: var(--accent);
  font-weight: 500;
  padding-top: 0.8rem;
}

.project__main h3 {
  font-family: var(--display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-variation-settings: 'opsz' 60;
  font-weight: 400;
  margin-bottom: 0.5rem;
  letter-spacing: -0.02em;
}

.project__tag {
  display: inline-block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-weight: 500;
}

.project__desc {
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--text);
  margin-bottom: 1.5rem;
}

.project__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  color: var(--accent);
  border: none;
}

.project__link::after {
  content: '→';
  transition: transform 0.2s ease;
}

.project__link:hover::after {
  transform: translateX(4px);
}

.project__meta dl {
  display: grid;
  gap: 1rem;
}

.project__meta dt {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 0.25rem;
}

.project__meta dd {
  font-size: 0.95rem;
  color: var(--text);
}

.project__meta .status-live {
  color: #2D6A3D;
  font-weight: 600;
}

.project__meta .status-progress {
  color: var(--accent);
  font-weight: 600;
}

/* ─── Skills ─────────────────────────────────── */

.skills__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 3rem 4rem;
}

.skills__group h4 {
  margin-bottom: 1rem;
  color: var(--accent);
  font-size: 0.78rem;
  letter-spacing: 0.18em;
}

.skills__group ul {
  list-style: none;
}

.skills__group li {
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--line-soft);
  font-size: 0.98rem;
  display: flex;
  justify-content: space-between;
  align-items: baseline;
}

.skills__group li em {
  color: var(--text-muted);
  font-size: 0.82rem;
  font-style: normal;
}

/* ─── Thinking / Notes ───────────────────────── */

.thinking {
  background: var(--bg-alt);
}

.thinking__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
}

@media (max-width: 800px) {
  .thinking__grid {
    grid-template-columns: 1fr;
  }
}

.thinking__card {
  background: var(--paper);
  padding: 2.5rem;
  border: 1px solid var(--line);
}

.thinking__card h3 {
  font-size: 1.5rem;
  margin-bottom: 1rem;
  font-variation-settings: 'opsz' 36;
}

.thinking__card p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.6;
}

.thinking__card .date {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-dim);
  font-weight: 600;
  margin-bottom: 1rem;
  display: block;
}

/* ─── Contact ────────────────────────────────── */

.contact {
  background: var(--text);
  color: var(--paper);
  padding: 8rem 0 4rem;
}

.contact h2 {
  color: var(--paper);
  margin-bottom: 2rem;
}

.contact p {
  color: rgba(250, 248, 242, 0.7);
  font-size: 1.2rem;
  line-height: 1.6;
  max-width: 50ch;
  margin-bottom: 3rem;
}

.contact__links {
  display: flex;
  flex-wrap: wrap;
  gap: 2.5rem;
  padding: 2rem 0;
  border-top: 1px solid rgba(250, 248, 242, 0.15);
  border-bottom: 1px solid rgba(250, 248, 242, 0.15);
  margin-bottom: 3rem;
}

.contact__links a {
  color: var(--paper);
  font-size: 1.05rem;
  border-bottom: 1px solid rgba(250, 248, 242, 0.3);
  padding-bottom: 0.2rem;
}

.contact__links a:hover {
  color: var(--accent-soft);
  border-color: var(--accent-soft);
  opacity: 1;
}

.contact__note {
  font-size: 0.9rem;
  color: rgba(250, 248, 242, 0.5);
  font-style: italic;
  margin-bottom: 4rem;
}

.contact__footer {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(250, 248, 242, 0.4);
  font-weight: 500;
}

@media (max-width: 600px) {
  .contact__footer {
    flex-direction: column;
    gap: 0.5rem;
  }
}

/* ─── Project page styles ────────────────────── */

.project-page {
  padding: 9rem 0 6rem;
  max-width: 780px;
  margin: 0 auto;
  padding-left: var(--gutter);
  padding-right: var(--gutter);
}

.project-page__back {
  display: inline-block;
  margin-bottom: 3rem;
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  font-weight: 600;
  border: none;
  color: var(--text-muted);
}

.project-page__back:hover {
  color: var(--accent);
  opacity: 1;
}

.project-page__meta {
  display: flex;
  gap: 2rem;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-muted);
  margin-bottom: 1.5rem;
  font-weight: 600;
}

.project-page h1 {
  font-size: clamp(2.5rem, 6vw, 4.5rem);
  margin-bottom: 1.5rem;
  font-variation-settings: 'opsz' 144;
  font-weight: 400;
  letter-spacing: -0.03em;
  line-height: 1;
}

.project-page__lede {
  font-size: 1.35rem;
  line-height: 1.5;
  color: var(--text);
  font-family: var(--display);
  font-variation-settings: 'opsz' 36;
  font-weight: 400;
  margin-bottom: 4rem;
  padding-bottom: 2.5rem;
  border-bottom: 1px solid var(--line);
}

.project-page h2 {
  font-size: 1.5rem;
  margin: 3rem 0 1.25rem;
  font-variation-settings: 'opsz' 24;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.project-page p {
  font-size: 1.05rem;
  line-height: 1.75;
  margin-bottom: 1.25rem;
  max-width: none;
}

.project-page ul {
  margin: 1rem 0 1.5rem 1.5rem;
  font-size: 1.05rem;
  line-height: 1.7;
}

.project-page li {
  margin-bottom: 0.4rem;
}

.project-page__stack {
  background: var(--paper);
  padding: 1.5rem 2rem;
  border-left: 2px solid var(--accent);
  margin: 2rem 0;
  font-size: 0.95rem;
  font-family: var(--mono);
  color: var(--text-muted);
}

.project-page__quote {
  font-family: var(--display);
  font-style: italic;
  font-size: 1.5rem;
  font-variation-settings: 'opsz' 60;
  font-weight: 400;
  line-height: 1.4;
  color: var(--accent);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: 2rem 0;
  margin: 3rem 0;
}

/* ─── Animations ─────────────────────────────── */

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeUp 0.8s ease forwards;
}

.fade-in-delay-1 { animation-delay: 0.1s; opacity: 0; }
.fade-in-delay-2 { animation-delay: 0.25s; opacity: 0; }
.fade-in-delay-3 { animation-delay: 0.4s; opacity: 0; }
.fade-in-delay-4 { animation-delay: 0.55s; opacity: 0; }

/* On scroll reveal */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Traction strip (NEW) ───────────────────── */

.traction {
  background: var(--paper);
  padding: 4rem 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.traction__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

@media (max-width: 800px) {
  .traction__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 2.5rem;
  }
}

.traction__item {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  padding: 0 1rem;
  border-left: 1px solid var(--line);
}

.traction__item:first-child {
  border-left: none;
  padding-left: 0;
}

@media (max-width: 800px) {
  .traction__item:nth-child(3) {
    border-left: none;
    padding-left: 0;
  }
}

.traction__num {
  font-family: var(--display);
  font-size: clamp(2.4rem, 5vw, 3.5rem);
  font-weight: 400;
  font-variation-settings: 'opsz' 96;
  letter-spacing: -0.03em;
  color: var(--accent);
  line-height: 1;
}

.traction__label {
  font-size: 0.95rem;
  line-height: 1.4;
  color: var(--text);
  font-weight: 500;
}

.traction__note {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text-muted);
  margin-top: 0.25rem;
}

/* ─── Language toggle ────────────────────────── */

.lang-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-left: 1.5rem;
  padding-left: 1.5rem;
  border-left: 1px solid var(--line);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  font-weight: 600;
  text-transform: uppercase;
}

.lang-toggle__link {
  color: var(--text-muted);
  border: none;
  transition: color 0.2s ease;
}

.lang-toggle__link.is-active {
  color: var(--accent);
  cursor: default;
}

.lang-toggle__link:not(.is-active):hover {
  color: var(--text);
  opacity: 1;
}

.lang-toggle__sep {
  color: var(--text-dim);
  user-select: none;
}

@media (max-width: 700px) {
  .lang-toggle {
    margin-left: 0.75rem;
    padding-left: 0.75rem;
    font-size: 0.72rem;
  }
}