:root{
  --ink: #16202b;
  --paper: #edf1f5;
  --surface: #ffffff;
  --surface-2: #e3e8ee;
  --line: rgba(22,32,43,0.12);
  --amber: #b8681a;
  --amber-soft: rgba(184,104,26,0.12);
  --violet: #4a52c4;
  --violet-soft: rgba(74,82,196,0.10);
  --shadow: 0 1px 2px rgba(22,32,43,0.04), 0 12px 32px -16px rgba(22,32,43,0.18);
  --font-kr: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Apple SD Gothic Neo', 'Malgun Gothic', sans-serif;
  --font-mono: ui-monospace, 'SF Mono', 'Cascadia Code', 'Roboto Mono', Consolas, monospace;
}
@media (prefers-color-scheme: dark){
  :root{
    --ink: #f2ede3;
    --paper: #0d1219;
    --surface: #151c27;
    --surface-2: #1c2531;
    --line: rgba(242,237,227,0.12);
    --amber: #eea75a;
    --amber-soft: rgba(238,167,90,0.14);
    --violet: #8d94ff;
    --violet-soft: rgba(141,148,255,0.14);
    --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 20px 48px -20px rgba(0,0,0,0.6);
  }
}
:root[data-theme="dark"]{
  --ink: #f2ede3;
  --paper: #0d1219;
  --surface: #151c27;
  --surface-2: #1c2531;
  --line: rgba(242,237,227,0.12);
  --amber: #eea75a;
  --amber-soft: rgba(238,167,90,0.14);
  --violet: #8d94ff;
  --violet-soft: rgba(141,148,255,0.14);
  --shadow: 0 1px 2px rgba(0,0,0,0.3), 0 20px 48px -20px rgba(0,0,0,0.6);
}
:root[data-theme="light"]{
  --ink: #16202b;
  --paper: #edf1f5;
  --surface: #ffffff;
  --surface-2: #e3e8ee;
  --line: rgba(22,32,43,0.12);
  --amber: #b8681a;
  --amber-soft: rgba(184,104,26,0.12);
  --violet: #4a52c4;
  --violet-soft: rgba(74,82,196,0.10);
  --shadow: 0 1px 2px rgba(22,32,43,0.04), 0 12px 32px -16px rgba(22,32,43,0.18);
}

*{ box-sizing:border-box; }
html{ scroll-behavior:smooth; }
@media (prefers-reduced-motion: reduce){ html{ scroll-behavior:auto; } }

body{
  margin:0;
  background:var(--paper);
  color:var(--ink);
  font-family:var(--font-kr);
  font-size:16px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  word-break:keep-all;
  overflow-wrap:break-word;
}

a{ color:inherit; }
img{ max-width:100%; display:block; }

.wrap{
  max-width:1120px;
  margin:0 auto;
  padding:0 clamp(20px,5vw,48px);
}

::selection{ background:var(--amber-soft); }

a:focus-visible, button:focus-visible{
  outline:2px solid var(--violet);
  outline-offset:3px;
  border-radius:4px;
}

.eyebrow{
  font-family:var(--font-mono);
  font-size:0.72rem;
  letter-spacing:0.14em;
  text-transform:uppercase;
  color:var(--ink);
  opacity:0.55;
}

/* ---------- topbar ---------- */
.topbar{
  position:sticky;
  top:0;
  z-index:40;
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:16px clamp(20px,5vw,48px);
  background:color-mix(in srgb, var(--paper) 82%, transparent);
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:border-color .3s ease, background .3s ease;
}
.topbar.scrolled{ border-bottom-color:var(--line); }
.brandmark{
  display:flex;
  align-items:center;
  gap:8px;
  text-decoration:none;
}
.brandmark img{ height:44px; width:auto; display:block; }
.brandmark .dot{ color:var(--amber); }
.topnav{ display:flex; align-items:center; gap:28px; font-size:0.85rem; }
.topnav a{ text-decoration:none; opacity:0.68; transition:opacity .2s; }
.topnav a:hover{ opacity:1; }
.topnav .cta{
  opacity:1;
  padding:8px 16px;
  border:1px solid var(--line);
  border-radius:100px;
  background:var(--surface);
}
@media (max-width:640px){ .topnav a:not(.cta){ display:none; } }

/* ---------- hero ---------- */
.hero{
  position:relative;
  min-height:92vh;
  display:flex;
  flex-direction:column;
  justify-content:center;
  padding-top:64px;
  overflow:hidden;
  background:
    radial-gradient(ellipse 80% 60% at 50% 8%, var(--amber-soft), transparent 60%),
    radial-gradient(ellipse 70% 50% at 82% 88%, var(--violet-soft), transparent 60%);
}
.hero-bridge{
  position:absolute;
  left:50%;
  bottom:-4%;
  transform:translateX(-50%);
  width:min(1400px, 160vw);
  opacity:0.9;
  pointer-events:none;
}
:root[data-theme="light"] .hero-bridge, .hero-bridge{ opacity:0.55; }
@media (prefers-color-scheme: dark){ .hero-bridge{ opacity:0.9; } }
:root[data-theme="dark"] .hero-bridge{ opacity:0.9; }

.hero::after{
  content:"";
  position:absolute; left:50%; bottom:-10%; transform:translateX(-50%);
  width:min(900px, 120vw); height:280px;
  background:radial-gradient(ellipse 60% 100% at 50% 100%, var(--amber-soft), transparent 70%);
  opacity:0.7; pointer-events:none;
  animation:dusk-breathe 6s ease-in-out infinite;
}
.bridge-lights circle{ animation:bridge-twinkle 3.2s ease-in-out infinite; transform-origin:center; transform-box:fill-box; }
.bridge-lights circle:nth-child(1){ animation-delay:0s; }
.bridge-lights circle:nth-child(2){ animation-delay:.4s; }
.bridge-lights circle:nth-child(3){ animation-delay:.8s; }
.bridge-lights circle:nth-child(4){ animation-delay:1.2s; }
.bridge-lights circle:nth-child(5){ animation-delay:.8s; }
.bridge-lights circle:nth-child(6){ animation-delay:.4s; }
.bridge-lights circle:nth-child(7){ animation-delay:0s; }

@keyframes dusk-breathe{
  0%,100%{ opacity:0.45; }
  50%{ opacity:0.85; }
}
@keyframes bridge-twinkle{
  0%,100%{
    r:3;
    filter:drop-shadow(0 0 2px var(--amber));
    opacity:0.8;
  }
  50%{
    r:4;
    filter:drop-shadow(0 0 9px var(--amber)) drop-shadow(0 0 16px var(--amber));
    opacity:1;
  }
}
@media (prefers-reduced-motion: reduce){
  .hero::after{ animation:none; opacity:0.6; }
  .bridge-lights circle{ animation:none; }
}

.hero-inner{ position:relative; z-index:2; }
.hero .eyebrow{ margin-bottom:22px; }
.hero h1{
  font-size:clamp(2.3rem, 6vw, 4.4rem);
  line-height:1.14;
  letter-spacing:-0.01em;
  font-weight:800;
  margin:0 0 26px;
  text-wrap:balance;
  max-width:14ch;
}
.hero h1 .accent{ color:var(--amber); }
.hero p.lede{
  font-size:clamp(1.02rem, 2vw, 1.28rem);
  max-width:46ch;
  opacity:0.82;
  margin:0 0 40px;
  text-wrap:pretty;
}
.hero-ctas{ display:flex; gap:14px; flex-wrap:wrap; }
.btn{
  font-family:var(--font-kr);
  font-size:0.94rem;
  font-weight:600;
  padding:13px 26px;
  border-radius:100px;
  border:1px solid transparent;
  cursor:pointer;
  text-decoration:none;
  display:inline-flex;
  align-items:center;
  gap:8px;
  transition:transform .18s ease, box-shadow .18s ease, background .18s ease;
}
.btn-primary{ background:var(--ink); color:var(--paper); }
.btn-primary:hover{ transform:translateY(-1px); box-shadow:var(--shadow); }
.btn-ghost{ background:transparent; border-color:var(--line); color:var(--ink); }
.btn-ghost:hover{ background:var(--surface); }

/* ---------- section shell ---------- */
section{ padding:min(14vw,120px) 0; }
.section-head{ max-width:64ch; margin-bottom:56px; }
.section-head h2{
  font-size:clamp(1.6rem, 3vw, 2.3rem);
  letter-spacing:-0.01em;
  margin:14px 0 0;
  text-wrap:balance;
}

/* ---------- about / vision ---------- */
.about-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(28px,5vw,44px);
  align-items:start;
}

.vision-quote{
  font-size:clamp(1.3rem, 2.6vw, 1.85rem);
  line-height:1.5;
  font-weight:600;
  letter-spacing:-0.005em;
  text-wrap:balance;
  margin:0;
}
.vision-quote .amber{ color:var(--amber); }
.vision-quote .violet{ color:var(--violet); }

.mission-tag{
  display:inline-flex; align-items:center; gap:10px;
  margin-top:28px; padding:10px 18px;
  border:1px solid var(--line); border-radius:100px;
  font-family:var(--font-mono); font-size:0.82rem; letter-spacing:0.02em;
  background:var(--surface);
}
.mission-tag .dot{ width:6px; height:6px; border-radius:50%; background:var(--amber); }

.story-card{
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:20px;
  padding:clamp(24px,4vw,36px);
  box-shadow:var(--shadow);
}
.story-card p{ margin:0; opacity:0.86; }
.ai-track{
  margin-top:28px; padding-top:24px; border-top:1px dashed var(--line);
  display:grid; grid-template-columns:repeat(4,1fr); gap:12px;
}
@media (max-width:520px){ .ai-track{ grid-template-columns:repeat(2,1fr); } }
.ai-track div{ text-align:left; }
.ai-track .n{ font-family:var(--font-mono); font-size:0.68rem; opacity:0.5; letter-spacing:0.08em; }
.ai-track .role{ font-size:0.86rem; font-weight:600; margin-top:4px; }

/* ---------- roadmap ---------- */
.roadmap-line{
  position:relative;
  height:2px;
  background:linear-gradient(90deg, var(--line), var(--amber) 20%, var(--violet) 80%, var(--line));
  margin:0 0 0;
  display:none;
}
@media (min-width:640px){ .roadmap-line{ display:block; } }

.phase-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:20px;
}
@media (max-width:640px){
  .phase-grid{ grid-template-columns:1fr; gap:0; position:relative; }
  .phase-grid::before{
    content:""; position:absolute; left:15px; top:8px; bottom:8px; width:2px;
    background:linear-gradient(var(--amber), var(--violet));
    opacity:0.4;
  }
}

.phase{
  position:relative;
  min-width:0;
  background:var(--surface);
  border:1px solid var(--line);
  border-radius:18px;
  padding:24px 22px 26px;
  display:flex;
  flex-direction:column;
  gap:14px;
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s ease, transform .6s ease;
}
.phase.in{ opacity:1; transform:translateY(0); }
@media (prefers-reduced-motion: reduce){ .phase{ opacity:1; transform:none; transition:none; } }
@media (max-width:640px){ .phase{ margin-left:40px; margin-bottom:20px; } }

.phase-top{ display:flex; align-items:center; justify-content:space-between; gap:10px; }
.phase-num{ font-family:var(--font-mono); font-size:0.78rem; opacity:0.5; letter-spacing:0.06em; }
.badge{
  font-family:var(--font-mono); font-size:0.65rem; letter-spacing:0.08em; text-transform:uppercase;
  padding:4px 9px; border-radius:100px; white-space:nowrap;
}
.badge-archive{ background:var(--surface-2); color:var(--ink); opacity:0.65; }
.badge-live{ background:var(--amber-soft); color:var(--amber); }
.badge-vision{ background:var(--violet-soft); color:var(--violet); }
.badge-soon{ border:1px dashed var(--line); color:var(--ink); opacity:0.55; }

.phase h3{ font-size:1.15rem; margin:0; letter-spacing:-0.005em; }
.phase .ai-role{ font-family:var(--font-mono); font-size:0.72rem; opacity:0.5; letter-spacing:0.04em; }
.phase .desc{ font-size:0.9rem; opacity:0.78; margin:0; }

.screens-row{
  display:flex; gap:10px; overflow-x:auto; margin:2px -2px 2px; padding:2px;
  scrollbar-width:none; min-width:0; max-width:100%;
}
.screens-row::-webkit-scrollbar{ display:none; }
.screens-row img{
  width:104px; height:auto; aspect-ratio:1080/2340; object-fit:cover;
  border-radius:14px; border:1px solid var(--line); box-shadow:var(--shadow);
  flex:none; background:var(--surface-2);
}

.chip-row{ display:flex; flex-wrap:wrap; gap:6px; }
.chip{
  font-size:0.76rem; padding:5px 10px; border-radius:8px;
  background:var(--surface-2); opacity:0.85;
}

.highlight{
  margin-top:2px; padding:12px 14px; border-radius:12px;
  background:var(--amber-soft); border:1px solid transparent;
  font-size:0.82rem; line-height:1.55;
}
.highlight b{ color:var(--amber); }

.phase-links{ display:flex; gap:8px; flex-wrap:wrap; margin-top:2px; }
.phase-link{
  font-size:0.78rem; font-weight:600; text-decoration:none;
  padding:7px 13px; border-radius:100px; border:1px solid var(--line);
  display:inline-flex; align-items:center; gap:6px;
  transition:background .18s ease, border-color .18s ease;
}
.phase-link:hover{ background:var(--surface-2); border-color:transparent; }
.phase-link--primary{ background:var(--ink); color:var(--paper); border-color:transparent; }
.phase-link--primary:hover{ opacity:0.88; background:var(--ink); }

.phase--archive{ filter:saturate(0.75); }
.phase--warm{
  background:linear-gradient(165deg, var(--amber-soft), var(--surface) 55%);
  border-color:color-mix(in srgb, var(--amber) 30%, var(--line));
}
.phase--warm .badge-live{ background:var(--amber); color:var(--paper); }
.phase--soon{
  background:transparent;
  border-style:dashed;
}
.phase--soon .desc{ font-style:italic; }

.phase--grain::before{
  content:"";
  position:absolute;
  inset:0;
  border-radius:inherit;
  background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/><feColorMatrix type='matrix' values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 0.9 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  opacity:0.16;
  pointer-events:none;
}

/* ---------- news ---------- */
.news-list{
  display:flex;
  flex-direction:column;
  border-top:1px solid var(--line);
}
.news-item{
  display:grid;
  grid-template-columns:140px 1fr auto;
  align-items:baseline;
  gap:20px;
  padding:22px 4px;
  border-bottom:1px solid var(--line);
  text-decoration:none;
  color:inherit;
  transition:background .18s ease;
}
.news-item:hover{ background:var(--surface); }
@media (max-width:640px){
  .news-item{ grid-template-columns:1fr; gap:8px; }
  .news-item .news-date{ order:-1; }
}
.news-date{
  font-family:var(--font-mono); font-size:0.78rem; opacity:0.5;
  font-variant-numeric:tabular-nums;
  white-space:nowrap;
}
.news-body h3{ font-size:1rem; margin:0 0 4px; font-weight:600; }
.news-body p{ margin:0; font-size:0.86rem; opacity:0.7; }
.news-tag{
  font-family:var(--font-mono); font-size:0.65rem; letter-spacing:0.08em; text-transform:uppercase;
  padding:4px 9px; border-radius:100px; white-space:nowrap; align-self:start;
}
.news-tag--update{ background:var(--amber-soft); color:var(--amber); }
.news-tag--soon{ border:1px dashed var(--line); color:var(--ink); opacity:0.55; }

/* ---------- contact ---------- */
.contact{
  text-align:center;
}
.contact h2{
  font-size:clamp(1.7rem, 4vw, 2.6rem);
  text-wrap:balance;
  margin:0 auto 18px;
}
.contact p{ opacity:0.75; max-width:44ch; margin:0 auto 32px; }
.contact-email{
  font-size:1.05rem !important;
  font-weight:600;
  opacity:1 !important;
}
.contact-email span{
  font-family:var(--font-mono);
  font-weight:500;
  color:var(--amber);
  user-select:all;
}

/* ---------- doc page ---------- */
.doc-hero{ padding-top:min(14vw,120px); padding-bottom:8px; }
.back-link{ display:inline-flex; align-items:center; gap:6px; font-size:0.85rem; opacity:0.6; text-decoration:none; margin-bottom:20px; }
.back-link:hover{ opacity:1; }
.doc-hero h1{ font-size:clamp(1.8rem, 4vw, 2.6rem); margin:14px 0 0; letter-spacing:-0.01em; text-wrap:balance; }

.doc{ max-width:720px; margin:0 auto; padding-bottom:min(14vw,120px); }
.doc h2{ font-size:1.3rem; margin:56px 0 16px; letter-spacing:-0.005em; }
.doc h2:first-child{ margin-top:0; }
.doc h3{ font-size:1.05rem; margin:32px 0 10px; }
.doc p{ margin:0 0 16px; opacity:0.88; }
.doc ul{ margin:0 0 16px; padding-left:1.2em; }
.doc li{ margin-bottom:8px; opacity:0.88; }
.doc li::marker{ color:var(--amber); }
.doc blockquote{
  margin:16px 0; padding:14px 18px; border-left:3px solid var(--amber);
  background:var(--surface); border-radius:0 12px 12px 0; font-size:0.92rem; opacity:0.9;
}
.doc hr{ border:none; border-top:1px solid var(--line); margin:44px 0; }

.stage-grid{ display:grid; gap:16px; margin:20px 0 32px; }
.stage-card{ background:var(--surface); border:1px solid var(--line); border-radius:16px; padding:20px 22px; }
.stage-card .tag{ font-family:var(--font-mono); font-size:0.7rem; opacity:0.5; letter-spacing:0.06em; text-transform:uppercase; }
.stage-card h4{ margin:8px 0 0; font-size:1.02rem; }
.stage-card dl{ margin:14px 0 0; font-size:0.88rem; }
.stage-card dt{ font-weight:600; opacity:0.7; margin-top:10px; }
.stage-card dt:first-child{ margin-top:0; }
.stage-card dd{ margin:3px 0 0; opacity:0.82; }

footer{
  border-top:1px solid var(--line);
  padding:28px clamp(20px,5vw,48px) 40px;
  display:flex; justify-content:space-between; align-items:center;
  flex-wrap:wrap; gap:12px;
  font-family:var(--font-mono); font-size:0.72rem; opacity:0.5;
}