:root {
  --bg: #ffffff;
  --fg: #141414;
  --muted: #6e6a65;
  --line: #e9e6e1;
  --accent: #ff8000;
  --accent-text: #b85400; /* 흰 배경 위 작은 글씨용 (대비 확보) */
  --g0: #f1eeea;
  --g1: #ffe0bf;
  --g2: #ffb366;
  --g3: #ff8000;
  --g4: #b85400;
  --scroll-thumb: #cfcac3;

  --sans: "Geist", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --mono: "Geist Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
  --gutter: clamp(20px, 8.4vw, 120px);
  --label-col: 280px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0c0c0c;
    --fg: #f4f1ec;
    --muted: #8f8a84;
    --line: #252422;
    --accent-text: #ff9a3c;
    --g0: #1b1a19;
    --g1: #4a2a10;
    --g2: #8a4310;
    --g3: #e06f00;
    --g4: #ff9a3c;
    --scroll-thumb: #34312e;
  }
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.5;
  color: var(--fg);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

a {
  color: inherit;
  text-decoration: none;
}

ul {
  list-style: none;
}

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

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

.wrap {
  width: min(1200px, 100% - 2 * var(--gutter));
  margin-inline: auto;
}

/* 공통 모노 라벨 */
.label,
.sub,
.tag,
.note,
dt,
.status,
.nav-links,
.menu-button,
.scroll-cue,
.project-num,
.project-link,
.chips,
figcaption,
.contrib-foot,
.log-status,
.footer {
  font-family: var(--mono);
  font-size: 12px;
  font-weight: 400;
  letter-spacing: 0;
}

.label,
.sub,
dt {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.label span,
.nav-links span,
.menu span,
.project-num {
  color: var(--accent-text);
  font-weight: 500;
}

/* ===== 00 Hero ===== */
.hero {
  position: relative;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  overflow-x: clip; /* 세로는 열어 두어 파도가 About 위로 번지게 함 */
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 40px;
  position: relative;
  z-index: 2;
}

.js .nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

.brand {
  font-size: 15px;
  font-weight: 500;
}

.nav-links {
  display: flex;
  gap: 28px;
}

.nav-links span {
  margin-right: 6px;
}

/* 현재 보고 있는 섹션 */
.nav-links a[aria-current] {
  color: var(--accent-text); /* 12px 작은 글씨라 대비 확보용 진한 오렌지 */
}

.menu a[aria-current] {
  color: var(--accent);
}

.menu-button {
  display: none;
  align-items: center;
  gap: 8px;
  background: none;
  border: 0;
  color: var(--fg);
  cursor: pointer;
}

.bars {
  width: 16px;
  height: 6px;
  border-block: 1.5px solid currentColor;
}

/* 우측 슬라이드 메뉴 (popover 열림/닫힘 모두 트랜지션) */
.menu {
  inset: 0 0 0 auto;
  margin: 0;
  width: min(100%, 420px);
  height: 100%;
  max-width: none;
  max-height: none;
  border: 0;
  padding: 24px var(--gutter);
  background: var(--bg);
  color: var(--fg);
  transform: translateX(100%);
  transition:
    transform 0.45s cubic-bezier(0.2, 0.7, 0.2, 1),
    overlay 0.45s allow-discrete,
    display 0.45s allow-discrete;
}

.menu:popover-open {
  transform: translateX(0);
}

.menu::backdrop {
  background: rgb(0 0 0 / 0);
  transition:
    background 0.45s ease,
    overlay 0.45s allow-discrete,
    display 0.45s allow-discrete;
}

.menu:popover-open::backdrop {
  background: rgb(0 0 0 / 0.35);
}

@starting-style {
  .menu:popover-open {
    transform: translateX(100%);
  }
  .menu:popover-open::backdrop {
    background: rgb(0 0 0 / 0);
  }
}

.menu:popover-open li {
  animation: rise 0.5s cubic-bezier(0.2, 0.7, 0.2, 1) both;
}
.menu li:nth-child(2) { animation-delay: 0.04s; }
.menu li:nth-child(3) { animation-delay: 0.08s; }
.menu li:nth-child(4) { animation-delay: 0.12s; }
.menu li:nth-child(5) { animation-delay: 0.16s; }
.menu li:nth-child(6) { animation-delay: 0.2s; }

.menu ul {
  margin-top: 80px;
  display: grid;
  gap: 20px;
}

.menu a {
  font-size: 34px;
  font-weight: 500;
  letter-spacing: -0.03em;
}

.menu span {
  font-family: var(--mono);
  font-size: 12px;
  margin-right: 12px;
  vertical-align: middle;
}

.menu-close {
  float: right;
  font-family: var(--mono);
  font-size: 12px;
  background: none;
  border: 0;
  color: var(--fg);
  cursor: pointer;
}

.hero-copy {
  position: relative;
  z-index: 1;
  margin-top: clamp(150px, 21svh, 190px);
  display: grid;
  gap: 28px;
}

.status {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--muted);
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: pulse 2.4s ease-in-out infinite;
}

.name {
  font-size: clamp(58px, 7.8vw, 112px);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.05em;
}

.name span,
.contact-heading span {
  color: var(--accent);
}

.tagline {
  max-width: 640px;
  font-size: clamp(16px, 1.8vw, 26px);
  line-height: 1.4;
}

.scroll-cue {
  margin-top: auto;
  padding-bottom: 40px;
}

/* 화면 하단 고정 파도 (WebGL 미지원 시 CSS 그라데이션으로 대체) */
.mesh {
  position: fixed;
  inset: auto 0 0 0;
  z-index: 0;
  width: 100%;
  height: clamp(260px, 40svh, 380px);
  pointer-events: none;
  opacity: 0.4; /* 본문 섹션에서는 가독성을 위해 흐리게 */
  transition: opacity 0.8s ease;
  background:
    radial-gradient(50% 70% at 20% 100%, #ff8000cc, transparent),
    radial-gradient(45% 80% at 75% 100%, #ff6b00cc, transparent),
    radial-gradient(70% 50% at 50% 100%, #ffd3a1aa, transparent);
}

.mesh.bright {
  opacity: 1; /* Hero · Contact */
}

.mesh.gl {
  background: none;
}

/* ===== Scenes =====
   JS 켜짐: .scene은 화면 높이만큼의 스크롤 구간, .scene-inner는 화면에 고정되고
   main.js가 스크롤 위치에 맞춰 opacity/transform을 갱신 (페이드 전환).
   JS 꺼짐: 일반 세로 스크롤 페이지. */
html.js {
  scroll-snap-type: y mandatory;
}

.scene {
  position: relative;
  z-index: 1;
}

.hero .scene-inner {
  display: flex;
  flex-direction: column;
  min-height: 100svh;
}

.js .scene {
  height: 100svh;
  scroll-snap-align: start;
}

.js .scene-inner {
  position: fixed;
  inset: 0;
  display: flex;
  flex-direction: column;
  justify-content: safe center;
  padding-block: 120px 80px;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
  opacity: 0;
  pointer-events: none;
}

.js .hero .scene-inner {
  justify-content: flex-start;
  padding-block: 0;
}

.js .scene.active .scene-inner {
  pointer-events: auto;
}

/* ===== Sections ===== */
.section {
  display: grid;
  grid-template-columns: var(--label-col) 1fr;
  column-gap: 80px;
  padding-top: 56px;
  padding-bottom: 140px;
  border-top: 1px solid var(--line);
}

.js .section {
  padding-block: 0;
  border-top: 0;
}

.section .content {
  max-width: 840px;
  display: grid;
  gap: 40px;
  align-content: start;
}

.label span {
  display: block;
  margin-bottom: 6px;
}

/* 01 About */
.lead {
  font-size: clamp(18px, 2.1vw, 30px);
  line-height: 1.42;
  letter-spacing: -0.015em;
}

.meta {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 28px 24px;
}

dt {
  font-size: 11px;
  margin-bottom: 6px;
}

dd {
  font-size: 17px;
  line-height: 1.4;
}

/* 02 Now */
.now-list li {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 24px;
  padding-block: 28px;
  border-top: 1px solid var(--line);
}

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

.now-list p {
  max-width: 600px;
  font-size: clamp(16px, 1.67vw, 24px);
  line-height: 1.35;
}

.tag,
.note {
  color: var(--muted);
  white-space: nowrap;
}

/* 03 Projects */
.projects > li {
  border-top: 1px solid var(--line);
}

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

.project {
  display: grid;
  grid-template-columns: auto 1fr auto;
  grid-template-areas:
    "num title link"
    "desc desc desc"
    "chips chips chips";
  align-items: center;
  gap: 16px 20px;
  padding-block: 40px;
}

.project-num {
  grid-area: num;
  font-size: 13px;
}

.project-title {
  grid-area: title;
  font-size: clamp(34px, 3.5vw, 50px);
  font-weight: 500;
  line-height: 1.1;
  letter-spacing: -0.03em;
  transition: color 0.2s ease;
}

.project-link {
  grid-area: link;
  font-size: 13px;
  transition: transform 0.2s ease;
}

.project-desc {
  grid-area: desc;
  max-width: 640px;
  font-size: clamp(16px, 1.32vw, 19px);
  line-height: 1.45;
  color: var(--muted);
}

.project .chips {
  grid-area: chips;
}

.projects + .note {
  justify-self: end;
  margin-top: -24px;
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.chips li {
  border: 1px solid var(--line);
  border-radius: 999px;
}

.project .chips li,
.chips a {
  display: block;
  padding: 8px 14px;
}

/* 04 Stack */
.stack {
  grid-template-columns: repeat(3, 1fr);
}

.stack ul {
  display: grid;
  gap: 14px;
  margin-top: 14px;
  font-size: clamp(18px, 1.53vw, 22px);
  line-height: 1.3;
}

.learning li {
  color: var(--muted);
}

/* 05 Practice */
.heading {
  font-size: clamp(26px, 2.2vw, 32px);
  font-weight: 500;
  line-height: 1.2;
  letter-spacing: -0.025em;
}

.contrib {
  display: grid;
  gap: 16px;
}

figcaption,
.contrib-foot {
  color: var(--muted);
}

.contrib-scroll {
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-width: thin;
  scrollbar-color: var(--scroll-thumb) transparent;
}

/* scrollbar-color 미지원 WebKit(Safari)용 */
.contrib-scroll::-webkit-scrollbar {
  height: 6px;
}
.contrib-scroll::-webkit-scrollbar-track {
  background: transparent;
}
.contrib-scroll::-webkit-scrollbar-thumb {
  background: var(--scroll-thumb);
  border-radius: 999px;
}

.contrib-graph {
  display: grid;
  grid-template-rows: repeat(7, 12px);
  grid-auto-flow: column;
  grid-auto-columns: 12px;
  gap: 3px;
  width: max-content;
  min-height: 102px;
}

.contrib-graph i,
.legend i {
  display: block;
  border-radius: 2px;
  background: var(--g0);
}

.legend i {
  display: inline-block;
  width: 10px;
  height: 10px;
  vertical-align: -1px;
}

[data-l="1"] { background: var(--g1) !important; }
[data-l="2"] { background: var(--g2) !important; }
[data-l="3"] { background: var(--g3) !important; }
[data-l="4"] { background: var(--g4) !important; }

.contrib-foot {
  display: flex;
  justify-content: flex-end;
  gap: 16px;
  font-size: 11px;
}

.swipe-hint {
  display: none;
  margin-right: auto;
}

.log ul {
  margin-top: 16px;
}

.log li {
  border-top: 1px solid var(--line);
}

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

.log a {
  display: grid;
  grid-template-columns: 160px 1fr auto;
  grid-template-areas: "name desc status";
  align-items: center;
  gap: 4px 24px;
  padding-block: 18px;
}

.log code {
  grid-area: name;
  font-family: var(--mono);
  font-size: 14px;
}

.log-desc {
  grid-area: desc;
  color: var(--muted);
}

.log-status {
  grid-area: status;
  color: var(--muted);
}

.log-status.on {
  color: var(--accent-text);
}

.log-status.on::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  border-radius: 50%;
  background: var(--accent);
  vertical-align: 1px;
}

/* ===== 06 Contact ===== */
html:not(.js) .contact {
  padding-bottom: 300px;
}

.contact .section {
  padding-bottom: 0;
}

.js .contact .scene-inner {
  padding-bottom: 160px; /* 푸터 자리 */
}

.contact .content {
  gap: 36px;
}

.contact-heading {
  font-size: clamp(46px, 5.8vw, 84px);
  font-weight: 600;
  line-height: 0.96;
  letter-spacing: -0.045em;
}

.email {
  justify-self: start;
  font-size: clamp(18px, 1.53vw, 22px);
  font-weight: 500;
  text-decoration: underline;
  text-underline-offset: 4px;
  text-decoration-thickness: 1px;
}

/* LinkedIn 등 href가 비어 있는 링크는 숨김 */
.links li:has(a[href=""]) {
  display: none;
}

.footer {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 40px;
  z-index: 1;
  display: flex;
  justify-content: space-between;
  gap: 16px;
}

/* ===== Hover =====
   마우스가 있는 기기에서만 적용. 터치 기기는 탭한 뒤 호버 상태가 남아
   외부 링크에서 돌아왔을 때 색이 바뀐 채로 보이는 문제가 있음. */
@media (hover: hover) {
  .nav-links a:hover,
  .chips a:hover,
  .email:hover,
  .project:hover .project-title,
  .log a:hover code {
    color: var(--accent-text);
  }

  .menu a:hover {
    color: var(--accent);
  }

  .project:hover .project-link {
    transform: translate(3px, -3px);
  }
}

/* ===== Motion ===== */
@keyframes pulse {
  50% { opacity: 0.35; }
}

@keyframes rise {
  from { opacity: 0; transform: translateY(16px); }
}

@media (prefers-reduced-motion: no-preference) {
  .hero-copy > * {
    animation: rise 0.9s cubic-bezier(0.2, 0.7, 0.2, 1) both;
  }
  .hero-copy > :nth-child(2) { animation-delay: 0.08s; }
  .hero-copy > :nth-child(3) { animation-delay: 0.16s; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .dot { animation: none; }
  .menu, .menu::backdrop { transition: none; }
  .menu:popover-open li { animation: none; }
}

/* ===== Mobile ===== */
@media (max-width: 768px) {
  :root { --gutter: 20px; }
  .nav { padding-top: 24px; }
  .nav-links { display: none; }
  .menu-button { display: flex; }

  .hero-copy {
    margin-top: 150px;
    gap: 20px;
  }

  .status { font-size: 11px; gap: 8px; }
  .dot { width: 7px; height: 7px; }

  .scroll-cue { font-size: 11px; padding-bottom: 24px; }

  .section {
    grid-template-columns: 1fr;
    row-gap: 36px;
    padding-top: 28px;
    padding-bottom: 88px;
  }

  .label span {
    display: inline;
    margin: 0 10px 0 0;
  }

  .label, .sub, dt, .tag, .note, .project-num, .project-link, .chips, figcaption, .log-status, .footer {
    font-size: 11px;
  }

  .lead { line-height: 1.55; letter-spacing: -0.01em; }

  .section .content { gap: 44px; }

  .meta { grid-template-columns: repeat(2, 1fr); gap: 26px 8px; }
  dd { font-size: 14px; line-height: 1.45; }
  dt { font-size: 10px; }

  .now-list li {
    flex-direction: column;
    gap: 10px;
  }
  .now-list p { line-height: 1.55; }

  .project {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "num link"
      "title title"
      "desc desc"
      "chips chips";
    gap: 12px;
    padding-block: 28px;
  }
  .project .chips li { padding: 7px 12px; }

  .stack { grid-template-columns: repeat(2, 1fr); gap: 32px 0; }
  .stack ul { gap: 10px; }

  .swipe-hint { display: inline; }

  .log a {
    grid-template-columns: 1fr auto;
    grid-template-areas: "name status" "desc desc";
    padding-block: 14px;
  }
  .log code { font-size: 13px; }
  .log-desc { font-size: 14px; }

  html:not(.js) .contact { padding-bottom: 240px; }
  .contact .content { gap: 28px; }

  /* 장면 모드: 한 화면에 들어가도록 간격 압축 */
  .js .scene-inner { padding-block: 84px 40px; }
  .js .section { row-gap: 24px; }
  .js .section .content { gap: 32px; }
  .js .contact .scene-inner { padding-bottom: 120px; }

  .footer {
    flex-direction: column;
    gap: 6px;
    bottom: 24px;
    line-height: 1.5;
  }
}