/* AIPX landing — tokens follow docs/specs/2026-10-07-aipx-landing-design.md §5 */

@font-face {
  font-family: "Source Serif 4";
  src: url("/fonts/source-serif-4-600.woff2") format("woff2");
  font-weight: 600;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "Pretendard";
  src: url("/fonts/pretendard-subset.woff2") format("woff2");
  font-weight: 400 700;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "IBM Plex Mono";
  src: url("/fonts/plex-mono-400.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

:root {
  --paper: #f7f8f6;
  --paper-2: #eef1ee;
  --ink: #141a17;
  --ink-2: #5b655f;
  --line: #d9ded9;
  --accent: #007a55;
  --accent-ink: #ffffff;

  --serif: "Source Serif 4", "Iowan Old Style", Georgia, serif;
  --sans: "Pretendard", -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Malgun Gothic", "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --section: clamp(72px, 10vw, 128px);
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --paper: #0e1311;
    --paper-2: #141b18;
    --ink: #e7ece8;
    --ink-2: #9aa59f;
    --line: #26302b;
    --accent: #34b98a;
    --accent-ink: #0e1311;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --paper: #0e1311;
  --paper-2: #141b18;
  --ink: #e7ece8;
  --ink-2: #9aa59f;
  --line: #26302b;
  --accent: #34b98a;
  --accent-ink: #0e1311;
  color-scheme: dark;
}
:root[data-theme="light"] {
  color-scheme: light;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}
html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1,
h2,
h3,
p,
ol {
  margin: 0;
}
a {
  color: inherit;
}
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}
code {
  font-family: var(--mono);
  font-size: 0.88em;
  padding: 0.05em 0.35em;
  border: 1px solid var(--line);
  background: var(--paper-2);
  white-space: nowrap;
}

.skip {
  position: absolute;
  left: -9999px;
}
.skip:focus {
  left: var(--gutter);
  top: 12px;
  z-index: 10;
  background: var(--ink);
  color: var(--paper);
  padding: 8px 12px;
}

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* type */
.display {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(40px, 6.4vw, 72px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  text-wrap: balance;
}
:lang(ko) .display,
:lang(ko) .h2,
:lang(ko) .principle__title {
  font-family: var(--sans);
  font-weight: 650;
  letter-spacing: -0.035em;
  line-height: 1.18;
  word-break: keep-all;
}
:lang(ko) body,
:lang(ko) p {
  word-break: keep-all;
}
.h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(28px, 3.4vw, 40px);
  line-height: 1.15;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.h3 {
  font-size: 18px;
  font-weight: 650;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.lede {
  font-size: clamp(17px, 1.6vw, 20px);
  line-height: 1.65;
  color: var(--ink-2);
  max-width: 34em;
}
.lede--narrow {
  max-width: 30em;
}
.muted {
  color: var(--ink-2);
  font-size: 15px;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

/* masthead */
.masthead {
  position: sticky;
  top: 0;
  z-index: 5;
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.masthead__row {
  display: flex;
  align-items: center;
  gap: 32px;
  min-height: 64px;
}
.brand {
  display: flex;
  align-items: baseline;
  gap: 12px;
  text-decoration: none;
  margin-right: auto;
}
.brand__mark {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 22px;
  letter-spacing: 0.04em;
}
.brand__mark--small {
  font-size: 15px;
  margin-right: 6px;
}
.brand__tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.masthead__nav {
  display: flex;
  gap: 24px;
  font-size: 14px;
}
.masthead__nav a,
.textlink {
  text-decoration: none;
  color: var(--ink-2);
}
.masthead__nav a:hover,
.textlink:hover {
  color: var(--ink);
}
.lang {
  display: flex;
  border: 1px solid var(--line);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.06em;
}
.lang a {
  padding: 5px 10px;
  text-decoration: none;
  color: var(--ink-2);
}
.lang a + a {
  border-left: 1px solid var(--line);
}
.lang a[aria-current="page"] {
  background: var(--ink);
  color: var(--paper);
}

/* hero */
.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(32px, 6vw, 88px);
  align-items: center;
  padding-block: clamp(56px, 9vw, 120px);
}
.hero__copy {
  display: grid;
  gap: 28px;
}
.hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px 28px;
}
.button {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding: 0 22px;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  font-weight: 600;
  font-size: 15px;
  border-radius: 2px;
}
.button:hover {
  background: var(--accent);
  color: var(--accent-ink);
}
.button--large {
  min-height: 56px;
  padding: 0 28px;
  font-family: var(--mono);
  font-weight: 400;
  letter-spacing: 0.02em;
}
.hero__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--paper-2);
}
.strata {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
}
.hero__caption {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  border-top: 1px solid var(--line);
  padding: 10px 14px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}

/* sections */
.band {
  padding-block: var(--section);
}
.band--rule {
  border-top: 1px solid var(--line);
}
.section-head {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.trio {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(24px, 3vw, 48px);
}
.trio__item {
  display: grid;
  gap: 10px;
  align-content: start;
  border-top: 2px solid var(--ink);
  padding-top: 20px;
}
.trio__item p,
.layer p,
.principle p {
  color: var(--ink-2);
  max-width: 34em;
}

/* foundation */
.foundation {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: start;
}
.foundation__head {
  position: sticky;
  top: 112px;
  margin-bottom: 0;
}
.stack {
  display: grid;
  gap: 6px;
  margin-top: 24px;
}
.stack__layer {
  display: block;
  padding: 12px 14px;
  border: 1px solid var(--line);
  background: var(--paper);
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--ink-2);
  transition: background 0.35s, color 0.35s, border-color 0.35s, transform 0.35s;
}
.stack__layer:nth-child(1) { margin-inline: 0; }
.stack__layer:nth-child(2) { margin-inline: 4%; }
.stack__layer:nth-child(3) { margin-inline: 8%; }
.stack__layer:nth-child(4) { margin-inline: 4%; }
.stack__layer:nth-child(5) { margin-inline: 0; }
.stack__layer.is-active {
  background: var(--accent);
  border-color: var(--accent);
  color: var(--accent-ink);
}
.layers {
  list-style: none;
  padding: 0;
  display: grid;
}
.layer {
  display: grid;
  gap: 8px;
  padding: 28px 0;
  border-top: 1px solid var(--line);
  transition: opacity 0.35s;
}
.layer:last-child {
  border-bottom: 1px solid var(--line);
}
.js-motion .layer:not(.is-active) {
  opacity: 0.42;
}

/* services */
.services {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(32px, 6vw, 96px);
  align-items: center;
}
.services .section-head {
  margin-bottom: 0;
}
.slots {
  display: grid;
  gap: 0;
}
.slots__row {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 10px;
}
.slot {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  min-height: 120px;
  border: 1px solid var(--line);
  border-bottom: 0;
  background: var(--paper);
  font-family: var(--mono);
  font-size: 12px;
  color: var(--ink-2);
}
.slot i {
  display: inline-block;
  width: 2.6em;
  height: 0.9em;
  background: var(--line);
}
.slot::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 50%;
  width: 1px;
  height: 28px;
  background: var(--line);
}
.slot--open {
  border-style: dashed;
  font-size: 18px;
}
.slots__base {
  border: 1px solid var(--ink);
  background: var(--ink);
  color: var(--paper);
  padding: 14px;
  text-align: center;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.12em;
}

/* principles */
.principles {
  display: grid;
}
.principle {
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(0, 1fr);
  gap: 16px 48px;
  align-items: baseline;
  padding-block: 32px;
  border-top: 1px solid var(--line);
}
.principle:last-child {
  border-bottom: 1px solid var(--line);
}
.principle__title {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(24px, 2.8vw, 34px);
  line-height: 1.2;
  letter-spacing: -0.01em;
}

/* contact & footer */
.contact__row {
  display: flex;
  flex-wrap: wrap;
  align-items: end;
  justify-content: space-between;
  gap: 32px;
}
.contact__row > div {
  display: grid;
  gap: 16px;
}
.footer {
  border-top: 1px solid var(--line);
  padding-block: 32px;
  font-size: 13px;
  color: var(--ink-2);
}
.footer__row {
  display: grid;
  gap: 6px;
}
.footer a {
  color: var(--ink-2);
}

/* responsive */
@media (max-width: 900px) {
  .masthead__nav {
    display: none;
  }
  .hero,
  .foundation,
  .services {
    grid-template-columns: minmax(0, 1fr);
  }
  .foundation__head {
    position: static;
  }
  .trio {
    grid-template-columns: minmax(0, 1fr);
  }
  .principle {
    grid-template-columns: minmax(0, 1fr);
  }
}
@media (max-width: 480px) {
  .brand__tag {
    display: none;
  }
  .slots__row {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .slot {
    border-bottom: 1px solid var(--line);
  }
  .slot::after {
    display: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .stack__layer,
  .layer {
    transition: none;
  }
}