/* ============================================================
   Adelie Pages — introduction site
   Design contract: DESIGN.md "Pressed Paper Editorial Flow"
   ============================================================ */

@font-face {
  font-family: "LINESeedKR";
  src: url("../fonts/LINESeedKR-Rg.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}
@font-face {
  font-family: "LINESeedKR";
  src: url("../fonts/LINESeedKR-Bd.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --indigo: #123F8D;
  --indigo-pressed: #0A3278;
  --indigo-soft: #E9ECF2;
  --focus-ring: #4E73B7;

  --canvas: #F8F8F8;
  --sunken: #EFEFED;
  --paper: #FAF5EC;
  --paper-line: #D9D0C1;

  --text: #211C17;
  --text-2: #665E55;
  --text-3: #6F675E;

  --rule: #D8D8D5;
  --rule-strong: #BCBDBA;

  --success: #527047;
  --warning: #8A5D20;

  --font: "LINESeedKR", Pretendard, "Apple SD Gothic Neo",
          system-ui, -apple-system, "Segoe UI", sans-serif;

  --wrap: 1120px;
  --s4: 8px;
  --s6: 12px;
  --s8: 16px;
  --s12: 24px;
  --s16: 32px;
  --s24: 48px;
  --margin: 20px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background-color: var(--canvas);
  background-image: url("../img/brand/paper-grain.png");
  background-size: 320px 320px;
  color: var(--text);
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  word-break: keep-all;
  overflow-wrap: anywhere;
}

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

a { color: var(--indigo); text-decoration-thickness: 1px; text-underline-offset: 3px; }
a:hover { color: var(--indigo-pressed); }

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

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--indigo);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}
.skip-link:focus { left: 12px; top: 12px; color: #fff; }

.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--margin);
}
.wrap.narrow { max-width: 760px; }

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

h1, h2, h3 { margin: 0; font-weight: 700; letter-spacing: -0.02em; line-height: 1.22; }

.eyebrow {
  margin: 0 0 var(--s8);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--indigo);
  text-transform: uppercase;
}

.section-title { font-size: clamp(26px, 3.4vw, 38px); }

.section-lede {
  margin: var(--s12) 0 0;
  max-width: 60ch;
  color: var(--text-2);
  font-size: 16.5px;
}

.dim { color: var(--text-3); }
.footnote { margin-top: var(--s12); font-size: 13.5px; color: var(--text-3); }

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: color-mix(in srgb, var(--canvas) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--rule);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s16);
  min-height: 60px;
}

.wordmark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--indigo);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.03em;
  text-decoration: none;
}
.wordmark img { border-radius: 6px; }

.site-nav {
  display: flex;
  gap: var(--s12);
  font-size: 14px;
}
.site-nav a {
  color: var(--text-2);
  text-decoration: none;
  padding: 6px 2px;
  border-bottom: 1px solid transparent;
}
.site-nav a:hover { color: var(--indigo); border-bottom-color: var(--indigo); }

/* ── Sections ───────────────────────────────────────────── */

section[id] { scroll-margin-top: 72px; }

.section { padding: clamp(56px, 8vw, 104px) 0; border-top: 1px solid var(--rule); }
.section-sunken { background: color-mix(in srgb, var(--sunken) 70%, transparent); }

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

.hero { padding: clamp(40px, 6vw, 84px) 0 clamp(48px, 7vw, 96px); overflow: hidden; }

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}

.hero h1 {
  font-size: clamp(32px, 5.4vw, 56px);
  line-height: 1.18;
  letter-spacing: -0.035em;
}

.lede {
  margin: var(--s16) 0 0;
  max-width: 46ch;
  font-size: 17px;
  color: var(--text-2);
}

.hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s4) var(--s6);
  margin: var(--s16) 0 0;
  padding: 0;
  list-style: none;
}
.hero-facts li {
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  padding: 5px 10px;
  font-size: 12.5px;
  color: var(--text-2);
  background: color-mix(in srgb, #fff 55%, transparent);
}

.notice {
  margin: var(--s16) 0 0;
  padding: 14px 16px;
  background: var(--indigo-soft);
  border-left: 3px solid var(--indigo);
  border-radius: 2px;
  font-size: 14px;
  color: var(--text-2);
  max-width: 46ch;
}
.notice strong { color: var(--indigo); }

/* Phone frame */

.phone {
  position: relative;
  width: 100%;
  max-width: 290px;
  border-radius: 26px;
  padding: 8px;
  background: #FFFFFF;
  border: 1px solid var(--rule-strong);
  box-shadow: 0 1px 1px rgba(33, 28, 23, 0.05),
              0 14px 34px rgba(33, 28, 23, 0.10);
}
.phone img { border-radius: 19px; background: var(--canvas); }

.hero-art {
  position: relative;
  display: flex;
  justify-content: center;
  min-height: 664px;
}
.hero-art .phone { position: absolute; top: 0; }
.phone-back {
  max-width: 236px;
  transform: translate(52%, 46px) rotate(5deg);
  opacity: 0.92;
  filter: saturate(0.94);
}
.phone-front { transform: translate(-16%, 0) rotate(-2deg); }

/* ── Flow ───────────────────────────────────────────────── */

.flow {
  list-style: none;
  margin: var(--s24) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border-block: 1px solid var(--rule);
}
.flow li {
  background: var(--canvas);
  padding: var(--s16) var(--s12) var(--s16) 0;
  padding-inline-start: var(--s12);
}
.flow li:first-child { padding-inline-start: 0; }

.step-no {
  margin: 0 0 var(--s8);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--indigo);
}
.flow h3 { font-size: 19px; margin-bottom: var(--s6); }
.flow p:last-child { margin: 0; color: var(--text-2); font-size: 15px; }

/* ── Gallery ────────────────────────────────────────────── */

.scroll-hint {
  margin: var(--s12) 0 0;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.gallery {
  display: flex;
  gap: var(--s16);
  margin-top: var(--s24);
  padding: 4px var(--margin) var(--s12);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
}
.gallery::before, .gallery::after {
  content: "";
  flex: 0 0 max(0px, calc((100vw - var(--wrap)) / 2 - var(--margin)));
}
.gallery figure {
  flex: 0 0 auto;
  width: 244px;
  margin: 0;
  scroll-snap-align: center;
}
.gallery .phone { max-width: 244px; }
.gallery figcaption {
  margin-top: var(--s12);
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--text-2);
}
.gallery figcaption b {
  display: block;
  color: var(--text);
  font-size: 15px;
  margin-bottom: 2px;
}

/* ── Split sections ─────────────────────────────────────── */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(28px, 5vw, 64px);
  align-items: center;
}
.split-reverse .split-media { order: -1; }
.split-media { display: flex; justify-content: center; gap: var(--s12); }
.split-media .phone { max-width: 270px; }

.stack-two .phone:nth-child(1) { transform: rotate(-2deg); }
.stack-two .phone:nth-child(2) { transform: rotate(2deg) translateY(18px); max-width: 240px; }

.ticks {
  margin: var(--s16) 0 0;
  padding: 0;
  list-style: none;
}
.ticks li {
  position: relative;
  padding: 12px 0 12px 22px;
  border-bottom: 1px solid var(--rule);
  font-size: 15px;
  color: var(--text-2);
}
.ticks li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 21px;
  width: 6px;
  height: 6px;
  background: var(--indigo);
  border-radius: 1px;
}
.ticks b { color: var(--text); font-weight: 700; }

.paper-frame {
  margin: 0;
  padding: 14px;
  background: #fff;
  border: 1px solid var(--rule-strong);
  border-radius: 2px;
  box-shadow: 0 10px 28px rgba(33, 28, 23, 0.09);
  max-width: 420px;
}
.paper-frame img { border-radius: 1px; }

/* ── Packs ──────────────────────────────────────────────── */

.packs {
  list-style: none;
  margin: var(--s24) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: var(--s16);
}
.packs li {
  background: color-mix(in srgb, #fff 65%, transparent);
  border: 1px solid var(--rule);
  border-radius: 2px;
  overflow: hidden;
}
.packs img { aspect-ratio: 1 / 1; object-fit: cover; border-bottom: 1px solid var(--rule); }
.pack-meta { padding: var(--s12) var(--s12) var(--s16); }
.pack-meta h3 { font-size: 17px; }
.pack-sub {
  margin: 4px 0 var(--s8);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--indigo);
  text-transform: uppercase;
}
.pack-meta p:last-child { margin: 0; font-size: 14px; color: var(--text-2); }

/* ── Cards ──────────────────────────────────────────────── */

.cards {
  margin-top: var(--s24);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}
.cards article { background: var(--canvas); padding: var(--s16); }
.cards h3 { font-size: 18px; margin-bottom: var(--s8); }
.cards p { margin: 0; font-size: 14.5px; color: var(--text-2); }

/* ── Status ─────────────────────────────────────────────── */

.status-list { margin: var(--s24) 0 0; }
.status-list > div { border-top: 1px solid var(--rule); padding: var(--s16) 0; }
.status-list > div:last-child { border-bottom: 1px solid var(--rule); }
.status-list dt {
  display: flex;
  align-items: center;
  gap: var(--s4);
  font-weight: 700;
  font-size: 16px;
  margin-bottom: var(--s4);
}
.status-list dd { margin: 0; color: var(--text-2); font-size: 15px; }
.dot { width: 9px; height: 9px; border-radius: 50%; flex: 0 0 auto; }
.dot.done { background: var(--success); }
.dot.todo { background: var(--rule-strong); }
.dot.plan { background: var(--warning); }

/* ── FAQ ────────────────────────────────────────────────── */

.faq { margin-top: var(--s24); border-top: 1px solid var(--rule); }
.faq details { border-bottom: 1px solid var(--rule); }
.faq summary {
  padding: var(--s16) 34px var(--s16) 0;
  cursor: pointer;
  font-size: 16px;
  font-weight: 700;
  list-style: none;
  position: relative;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after {
  content: "";
  position: absolute;
  right: 6px;
  top: 50%;
  width: 9px;
  height: 9px;
  margin-top: -6px;
  border-right: 1.5px solid var(--indigo);
  border-bottom: 1.5px solid var(--indigo);
  transform: rotate(45deg);
  transition: transform 0.18s ease;
}
.faq details[open] summary::after { transform: rotate(-135deg); margin-top: -2px; }
.faq p { margin: 0 0 var(--s16); color: var(--text-2); font-size: 15px; max-width: 62ch; }

/* ── Footer ─────────────────────────────────────────────── */

.site-footer {
  border-top: 1px solid var(--rule);
  background: color-mix(in srgb, var(--sunken) 70%, transparent);
  padding: var(--s24) 0 var(--s16);
}
.footer-brand { display: flex; align-items: center; gap: var(--s8); }
.footer-brand img { border-radius: 8px; }
.footer-name { margin: 0; font-weight: 700; }
.footer-sub { margin: 0; font-size: 13px; color: var(--text-3); }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: var(--s16);
  margin: var(--s24) 0 var(--s16);
  padding-top: var(--s16);
  border-top: 1px solid var(--rule);
}
.footer-cols p { margin: 0; font-size: 13.5px; }
.footer-label {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text);
  margin-bottom: 4px !important;
}
.footer-legal {
  margin: 0;
  padding-top: var(--s12);
  border-top: 1px solid var(--rule);
  font-size: 12.5px;
  color: var(--text-3);
}

/* ── Reveal ─────────────────────────────────────────────── */

.reveal { opacity: 0; transform: translateY(14px); }
.reveal.in { opacity: 1; transform: none; transition: opacity 0.5s ease, transform 0.5s ease; }

/* ── Responsive ─────────────────────────────────────────── */

@media (max-width: 900px) {
  .hero-grid { grid-template-columns: 1fr; }
  .hero-art { min-height: 620px; margin-top: var(--s16); }
  .flow { grid-template-columns: 1fr; }
  .flow li { padding-inline-start: 0; padding-block: var(--s12); }
  .split { grid-template-columns: 1fr; }
  .split-reverse .split-media { order: 0; }
  .site-nav { display: none; }
}

@media (max-width: 560px) {
  :root { --margin: 16px; }
  .hero-art { min-height: 560px; }
  .phone-back { max-width: 190px; transform: translate(46%, 30px) rotate(6deg); }
  .phone-front { max-width: 240px; transform: translate(-16%, 0) rotate(-2deg); }
  .stack-two { flex-direction: column; align-items: center; }
  .stack-two .phone:nth-child(2) { transform: rotate(2deg); }
  .gallery { padding-inline: var(--margin); }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal, .reveal.in { opacity: 1; transform: none; transition: none; }
  .faq summary::after { transition: none; }
}