/* =========================================================
   taewook.com — Platform Architect Portfolio
   v2 — refined / editorial (Apple-inspired restraint)
   ========================================================= */

@import url("https://cdn.jsdelivr.net/gh/orioncactus/pretendard@v1.3.9/dist/web/variable/pretendardvariable.css");

/* ---------- Tokens ---------- */
:root {
  /* Latin → SF on Apple devices; Korean → Pretendard fallback */
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text",
          "Pretendard Variable", Pretendard, system-ui, "Helvetica Neue", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;

  --max: 1080px;
  --wide: 1280px;
  --gutter: clamp(22px, 5vw, 40px);
  --radius: 20px;
  --radius-lg: 28px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

:root, :root[data-theme="dark"] {
  --bg: #000000;
  --bg-2: #0a0a0c;
  --surface: #101012;
  --surface-2: #161618;
  --hair: rgba(255, 255, 255, 0.10);
  --hair-2: rgba(255, 255, 255, 0.18);
  --text: #f5f5f7;
  --text-2: #a1a1a6;
  --text-3: #6e6e73;
  --accent: #2997ff;
  --accent-2: #5eb3ff;
  --shadow: 0 30px 80px -40px rgba(0, 0, 0, 0.8);
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #ffffff;
  --bg-2: #fbfbfd;
  --surface: #ffffff;
  --surface-2: #f5f5f7;
  --hair: rgba(0, 0, 0, 0.10);
  --hair-2: rgba(0, 0, 0, 0.16);
  --text: #1d1d1f;
  --text-2: #515154;
  --text-3: #86868b;
  --accent: #0071e3;
  --accent-2: #0077ed;
  --shadow: 0 30px 70px -45px rgba(0, 0, 0, 0.25);
  color-scheme: light;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; transition-duration: .01ms !important; }
}
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 17px;
  line-height: 1.5;
  letter-spacing: -0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  word-break: keep-all;        /* 한글이 어절(띄어쓰기) 단위로만 줄바꿈되게 */
  overflow-wrap: break-word;   /* 단, 끊을 수 없는 긴 문자열(URL 등)은 강제 줄바꿈 */
  transition: background .5s var(--ease), color .5s var(--ease);
}
a { color: inherit; text-decoration: none; }
img, svg { display: block; max-width: 100%; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; color: inherit; background: none; border: none; }
::selection { background: var(--accent); color: #fff; }

/* ---------- Layout ---------- */
.wrap { width: 100%; max-width: var(--max); margin-inline: auto; padding-inline: var(--gutter); }
.wrap--wide { max-width: var(--wide); }
.section { padding-block: clamp(80px, 14vw, 170px); }
.section--sm { padding-block: clamp(56px, 9vw, 110px); }
.center { text-align: center; }

/* ---------- Type ---------- */
h1, h2, h3, h4 { font-weight: 600; letter-spacing: -0.025em; line-height: 1.06; }
.display { font-size: clamp(2.05rem, 6vw, 5.2rem); font-weight: 600; letter-spacing: -0.035em; line-height: 1.05; }
h2.title { font-size: clamp(2rem, 4.6vw, 3.4rem); letter-spacing: -0.03em; }
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }
.kicker {
  font-size: 0.82rem; font-weight: 500; letter-spacing: 0.02em;
  color: var(--accent); margin-bottom: 22px;
}
.label {
  font-size: 0.72rem; font-weight: 600; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--text-3);
}
.lead { font-size: clamp(1.12rem, 1.8vw, 1.45rem); line-height: 1.5; color: var(--text-2); letter-spacing: -0.015em; }
.body-2 { color: var(--text-2); }
.dim { color: var(--text-3); }
p { text-wrap: pretty; }

/* ---------- Buttons / links ---------- */
.btn {
  display: inline-flex; align-items: center; gap: .4em;
  font-size: 1rem; font-weight: 500;
  padding: 13px 26px; border-radius: 980px;
  transition: transform .25s var(--ease), background .25s, opacity .25s, border-color .25s;
}
.btn--fill { background: var(--accent); color: #fff; }
.btn--fill:hover { background: var(--accent-2); }
.btn--soft { background: var(--surface-2); color: var(--text); border: 1px solid var(--hair); }
.btn--soft:hover { border-color: var(--hair-2); }
.btn:active { transform: scale(.97); }
.linkarrow {
  display: inline-flex; align-items: center; gap: .25em;
  color: var(--accent); font-size: 1rem; font-weight: 500;
  transition: gap .25s var(--ease);
}
.linkarrow::after { content: "›"; font-size: 1.25em; line-height: 0; transform: translateY(1px); }
.linkarrow:hover { gap: .5em; }

/* ---------- Header / nav ---------- */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 80%, transparent);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color .4s, background .4s;
}
.nav.scrolled { border-bottom-color: var(--hair); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 56px; max-width: var(--wide); margin-inline: auto; padding-inline: var(--gutter); }
.logo { font-size: 1.02rem; font-weight: 600; letter-spacing: -0.02em; }
.menu { display: flex; gap: 2px; }
.menu a {
  font-size: 0.86rem; color: var(--text-2); padding: 7px 13px; border-radius: 8px;
  transition: color .2s, background .2s;
}
.menu a:hover { color: var(--text); }
.menu a.active { color: var(--text); }
.nav-actions { display: flex; align-items: center; gap: 6px; }
.iconbtn {
  width: 36px; height: 36px; display: grid; place-items: center; border-radius: 50%;
  color: var(--text-2); transition: color .2s, background .2s;
}
.iconbtn:hover { color: var(--text); background: var(--surface-2); }
.iconbtn svg { width: 19px; height: 19px; }
.theme-toggle .sun { display: none; }
:root[data-theme="light"] .theme-toggle .sun { display: block; }
:root[data-theme="light"] .theme-toggle .moon { display: none; }
.menu-toggle { display: none; }

@media (max-width: 880px) {
  .menu {
    position: fixed; inset: 56px 0 auto 0; flex-direction: column; gap: 0;
    background: var(--bg-2); border-bottom: 1px solid var(--hair);
    padding: 10px var(--gutter) 22px;
    transform: translateY(-130%); transition: transform .45s var(--ease); pointer-events: none;
  }
  .menu.open { transform: translateY(0); pointer-events: auto; }
  .menu a { padding: 15px 6px; font-size: 1rem; border-bottom: 1px solid var(--hair); }
  .menu-toggle { display: grid; }
}

/* ---------- Hero ---------- */
.hero { padding-top: clamp(70px, 15vw, 150px); padding-bottom: clamp(40px, 8vw, 80px); }
.hero--center { text-align: center; }
.hero--center .lead { margin-inline: auto; }
.hero .display { margin-bottom: 28px; }
.hero .lead { max-width: 40ch; }
@media (max-width: 540px) { .hero .display br { display: none; } }
.hero--center .actions { justify-content: center; }
.actions { display: flex; flex-wrap: wrap; gap: 14px 24px; align-items: center; margin-top: 40px; }

/* gradient sheen behind hero (very subtle) */
.hero-glow { position: relative; }
.hero-glow::before {
  content: ""; position: absolute; left: 50%; top: -120px; width: min(900px, 90vw); height: 520px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse at center, color-mix(in srgb, var(--accent) 16%, transparent), transparent 68%);
  filter: blur(20px); z-index: -1; pointer-events: none; opacity: .75;
}

/* ---------- Metrics band ---------- */
.metrics { display: grid; grid-template-columns: repeat(4, 1fr); gap: 28px; }
.metric .n { font-size: clamp(2rem, 4vw, 3rem); font-weight: 600; letter-spacing: -0.03em; }
.metric .n .accent { color: var(--accent); }
.metric .l { color: var(--text-2); font-size: 0.95rem; margin-top: 6px; }
@media (max-width: 720px) { .metrics { grid-template-columns: repeat(2, 1fr); gap: 36px 24px; } }

/* ---------- Section head ---------- */
.shead { max-width: 60ch; margin-bottom: clamp(40px, 6vw, 70px); }
.shead .kicker { margin-bottom: 16px; }
.shead .title + .lead { margin-top: 20px; }

/* ---------- Focus list (home) ---------- */
.focus { display: grid; grid-template-columns: repeat(2, 1fr); gap: 1px; background: var(--hair); border: 1px solid var(--hair); border-radius: var(--radius-lg); overflow: hidden; }
.focus .item { background: var(--bg); padding: 38px 34px; transition: background .3s; }
.focus .item:hover { background: var(--surface); }
.focus .item .ix { font-size: .8rem; color: var(--text-3); font-variant-numeric: tabular-nums; }
.focus .item h3 { margin: 16px 0 10px; }
.focus .item p { color: var(--text-2); font-size: .98rem; }
@media (max-width: 720px) { .focus { grid-template-columns: 1fr; } }

/* ---------- Philosophy ---------- */
.philosophy { text-align: center; max-width: 24ch; margin-inline: auto; }
.philosophy .big { font-size: clamp(1.7rem, 3.6vw, 2.8rem); font-weight: 600; letter-spacing: -0.03em; line-height: 1.18; }
.philosophy .sub { margin-top: 26px; max-width: 52ch; margin-inline: auto; }

/* ---------- Cards grid ---------- */
.grid { display: grid; gap: 20px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .cols-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px) { .cols-2, .cols-3 { grid-template-columns: 1fr; } }

.card {
  background: var(--surface); border: 1px solid var(--hair); border-radius: var(--radius);
  padding: 34px; transition: transform .35s var(--ease), border-color .35s, background .35s;
}
.card:hover { border-color: var(--hair-2); transform: translateY(-4px); }
.card h3 { margin-bottom: 14px; }
.card .sub { color: var(--text-2); font-size: .98rem; margin-bottom: 22px; }
.taglist { display: flex; flex-wrap: wrap; gap: 8px; }
.taglist span {
  font-size: .82rem; color: var(--text-2);
  border: 1px solid var(--hair); border-radius: 980px; padding: 6px 13px;
}

/* capability icon */
.capico { width: 46px; height: 46px; border-radius: 13px; display: grid; place-items: center; color: var(--accent); background: color-mix(in srgb, var(--accent) 12%, transparent); margin-bottom: 22px; }
.capico svg { width: 23px; height: 23px; }

/* ---------- Career snapshot (about) ---------- */
.snapshot { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
@media (max-width: 880px) { .snapshot { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 520px) { .snapshot { grid-template-columns: 1fr; } }
.snap { border: 1px solid var(--hair); border-radius: var(--radius); padding: 28px; background: var(--surface); }
.snap h4 { color: var(--accent); font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; margin-bottom: 18px; }
.snap ul { display: grid; gap: 11px; }
.snap li { color: var(--text-2); font-size: .96rem; }

/* ---------- Experience ---------- */
.xp { display: grid; gap: 18px; }
.xp-item { border: 1px solid var(--hair); border-radius: var(--radius-lg); padding: clamp(28px, 4vw, 44px); background: var(--surface); transition: border-color .35s; }
.xp-item:hover { border-color: var(--hair-2); }
.xp-head { display: flex; justify-content: space-between; align-items: baseline; flex-wrap: wrap; gap: 8px 18px; margin-bottom: 8px; }
.xp-head .org { font-size: clamp(1.3rem, 2.4vw, 1.8rem); font-weight: 600; letter-spacing: -0.025em; }
.xp-head .domain { font-size: .82rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; color: var(--text-3); }
.xp-item .role { color: var(--text-2); margin-bottom: 24px; }
.xp-list { display: grid; gap: 14px; }
.xp-list li { display: flex; gap: 14px; color: var(--text); }
.xp-list li::before { content: ""; flex: none; width: 6px; height: 6px; border-radius: 50%; background: var(--accent); transform: translateY(10px); }
.xp-list li .hl { color: var(--accent); font-weight: 600; }
.xp-metrics { display: flex; flex-wrap: wrap; gap: 36px; margin-top: 28px; padding-top: 24px; border-top: 1px solid var(--hair); }
.xp-metrics .m .n { font-size: 1.7rem; font-weight: 600; letter-spacing: -0.02em; }
.xp-metrics .m .l { color: var(--text-3); font-size: .82rem; margin-top: 2px; }

/* ---------- Insights / posts ---------- */
.filters { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 36px; }
.pill { font-size: .88rem; padding: 8px 16px; border-radius: 980px; border: 1px solid var(--hair); color: var(--text-2); transition: all .2s; }
.pill:hover { color: var(--text); border-color: var(--hair-2); }
.pill.active { background: var(--text); color: var(--bg); border-color: var(--text); }

.post-card { display: flex; flex-direction: column; min-height: 230px; }
.post-card .cat { color: var(--accent); font-size: .8rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.post-card h3 { margin: 16px 0 12px; transition: color .2s; }
.post-card:hover h3 { color: var(--accent); }
.post-card .excerpt { color: var(--text-2); font-size: .96rem; flex: 1; }
.post-card .meta { color: var(--text-3); font-size: .82rem; margin-top: 22px; }

/* ---------- Lab ---------- */
.lab-status { font-size: .72rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; padding: 5px 11px; border-radius: 980px; }
.lab-status.building { color: #ff9f0a; background: color-mix(in srgb, #ff9f0a 14%, transparent); }
.lab-status.planned { color: var(--text-3); background: var(--surface-2); }
.lab-status.live { color: #1f9d57; background: color-mix(in srgb, #1f9d57 14%, transparent); }
.lab-top { display: flex; justify-content: space-between; align-items: center; margin-bottom: 22px; }
.lab-ico { color: var(--accent); }
.lab-ico svg { width: 26px; height: 26px; }

/* ---------- Contact ---------- */
.channels { display: grid; gap: 12px; }
.channel { display: flex; align-items: center; gap: 18px; padding: 22px 26px; border: 1px solid var(--hair); border-radius: var(--radius); background: var(--surface); transition: border-color .25s, transform .25s; }
.channel:hover { border-color: var(--hair-2); transform: translateX(5px); }
.channel .ci { width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center; background: var(--surface-2); color: var(--accent); flex: none; }
.channel .ci svg { width: 21px; height: 21px; }
.channel .l { color: var(--text-3); font-size: .76rem; letter-spacing: .08em; text-transform: uppercase; }
.channel .v { font-weight: 500; margin-top: 2px; }
form .field { margin-bottom: 18px; }
form label { display: block; font-size: .82rem; color: var(--text-2); margin-bottom: 9px; letter-spacing: .02em; }
form input, form textarea {
  width: 100%; font: inherit; font-size: 1rem; background: var(--surface-2); color: var(--text);
  border: 1px solid var(--hair); border-radius: 13px; padding: 14px 16px; transition: border-color .2s, background .2s;
}
form input:focus, form textarea:focus { outline: none; border-color: var(--accent); }
form textarea { resize: vertical; min-height: 140px; }
.note { color: var(--text-3); font-size: .85rem; margin-top: 12px; }

/* ---------- CV / facts ---------- */
.fact { display: grid; grid-template-columns: 220px 1fr; gap: 20px; padding: 26px 0; border-bottom: 1px solid var(--hair); }
.fact .k { color: var(--text-3); font-size: .82rem; letter-spacing: .1em; text-transform: uppercase; padding-top: 3px; }
.fact .v strong { font-weight: 600; }
.fact .v .muted { color: var(--text-2); }
@media (max-width: 600px) { .fact { grid-template-columns: 1fr; gap: 8px; } }

/* ---------- Closing CTA ---------- */
.closing { text-align: center; border-top: 1px solid var(--hair); padding-block: clamp(80px, 12vw, 150px); }
.closing h2 { margin-bottom: 30px; max-width: 22ch; margin-inline: auto; }

/* ---------- Article ---------- */
.article { max-width: 720px; margin-inline: auto; }
.back { display: inline-flex; gap: 7px; color: var(--text-2); font-size: .9rem; margin-bottom: 34px; transition: gap .2s, color .2s; }
.back:hover { color: var(--accent); gap: 11px; }
.post-head { margin-bottom: 44px; padding-bottom: 32px; border-bottom: 1px solid var(--hair); }
.post-head .cat { color: var(--accent); font-size: .82rem; font-weight: 600; letter-spacing: .08em; text-transform: uppercase; }
.post-head h1 { font-size: clamp(2rem, 5vw, 3.2rem); margin: 18px 0; letter-spacing: -0.03em; }
.post-head .meta { color: var(--text-3); font-size: .88rem; }
.prose { font-size: 1.12rem; line-height: 1.75; color: var(--text-2); }
.prose > * + * { margin-top: 1.4em; }
.prose h2 { font-size: 1.6rem; color: var(--text); margin-top: 1.8em; }
.prose h3 { font-size: 1.28rem; color: var(--text); margin-top: 1.5em; }
.prose strong { color: var(--text); font-weight: 600; }
.prose a { color: var(--accent); text-decoration: underline; text-underline-offset: 3px; }
.prose ul, .prose ol { padding-left: 1.3em; }
.prose li { margin-top: .5em; }
.prose blockquote { border-left: 3px solid var(--hair-2); padding-left: 1.1em; color: var(--text); }
.prose code { font-family: var(--font-mono); font-size: .86em; background: var(--surface-2); padding: .15em .4em; border-radius: 6px; }
.prose pre { background: var(--surface-2); border: 1px solid var(--hair); border-radius: 14px; padding: 20px; overflow-x: auto; }
.prose pre code { background: none; padding: 0; }
.prose table { width: 100%; border-collapse: collapse; font-size: .98rem; }
.prose th, .prose td { border: 1px solid var(--hair); padding: 10px 14px; text-align: left; }
.prose hr { border: none; border-top: 1px solid var(--hair); margin: 2.4em 0; }
.loading, .empty { text-align: center; padding: 90px 0; color: var(--text-3); }

/* ---------- Footer ---------- */
.footer { border-top: 1px solid var(--hair); padding-block: 56px 44px; }
.footer-grid { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 36px; }
.footer .about { max-width: 32ch; }
.footer .about .logo { display: inline-block; margin-bottom: 14px; }
.footer .about p { color: var(--text-2); font-size: .92rem; }
.footer-links { display: flex; gap: 56px; flex-wrap: wrap; }
.footer-links .grp h5 { color: var(--text-3); font-size: .74rem; letter-spacing: .12em; text-transform: uppercase; margin-bottom: 16px; font-weight: 600; }
.footer-links .grp a { display: block; color: var(--text-2); font-size: .92rem; padding: 6px 0; transition: color .2s; }
.footer-links .grp a:hover { color: var(--text); }
.footer-base { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 12px; margin-top: 50px; padding-top: 26px; border-top: 1px solid var(--hair); color: var(--text-3); font-size: .82rem; }
.footer-base a { color: var(--text-3); transition: color .2s; }
.footer-base a:hover { color: var(--text); }

/* ---------- Reveal ---------- */
[data-reveal] { opacity: 0; transform: translateY(26px); transition: opacity .8s var(--ease), transform .8s var(--ease); }
[data-reveal].in { opacity: 1; transform: none; }