/* Artpreneurship Korea — shared system
   · Monochrome, Pretendard only, hairline rules. No gold, no serif. */

:root {
  --bg: #000000;
  --bg-2: #0a0a0a;
  --ink: #ffffff;
  --ink-mute: rgba(255, 255, 255, 0.64);
  --ink-faint: rgba(255, 255, 255, 0.4);
  --ink-hair: rgba(255, 255, 255, 0.14);
  --paper: #ffffff;
  --paper-ink: #000000;
  --paper-mute: rgba(0, 0, 0, 0.58);
  --paper-hair: rgba(0, 0, 0, 0.18);
  --paper-perf: #000000;
  --blue: #4b7bff;
  --blue-hover: #6b93ff;
  --radius: 2px;
  --maxw: 960px;
  --mono: "Pretendard Variable", "Pretendard", -apple-system, system-ui, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--ink); }
body {
  font-family: "Pretendard Variable", "Pretendard", -apple-system, BlinkMacSystemFont, system-ui, sans-serif;
  font-feature-settings: "ss10", "tnum";
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  line-height: 1.6;
  overflow-x: hidden;
}
img, svg { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; color: inherit; }

.liquid-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  z-index: 0;
}
.liquid-bg::before {
  content: "";
  position: absolute;
  inset: -20%;
  background:
    radial-gradient(circle at 20% 30%, rgba(75, 123, 255, 0.16), transparent 28%),
    radial-gradient(circle at 78% 18%, rgba(255, 255, 255, 0.08), transparent 24%),
    radial-gradient(circle at 55% 72%, rgba(75, 123, 255, 0.12), transparent 30%);
  filter: blur(36px);
  opacity: 0.8;
}
.liquid-bg .blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(50px);
  opacity: 0.3;
  mix-blend-mode: screen;
  animation: liquidFloat 18s ease-in-out infinite;
}
.liquid-bg .blob-a {
  width: 32vw;
  height: 32vw;
  min-width: 260px;
  min-height: 260px;
  left: -8vw;
  top: 8vh;
  background: radial-gradient(circle at 40% 40%, rgba(75, 123, 255, 0.42), rgba(75, 123, 255, 0));
}
.liquid-bg .blob-b {
  width: 28vw;
  height: 28vw;
  min-width: 220px;
  min-height: 220px;
  right: -6vw;
  top: 18vh;
  background: radial-gradient(circle at 50% 50%, rgba(255, 255, 255, 0.18), rgba(255, 255, 255, 0));
  animation-duration: 22s;
  animation-delay: -6s;
}
.liquid-bg .blob-c {
  width: 30vw;
  height: 30vw;
  min-width: 240px;
  min-height: 240px;
  left: 32vw;
  bottom: -10vh;
  background: radial-gradient(circle at 55% 45%, rgba(75, 123, 255, 0.28), rgba(75, 123, 255, 0));
  animation-duration: 26s;
  animation-delay: -11s;
}
@keyframes liquidFloat {
  0%, 100% { transform: translate3d(0, 0, 0) scale(1); }
  25% { transform: translate3d(4vw, -3vh, 0) scale(1.06); }
  50% { transform: translate3d(-3vw, 4vh, 0) scale(0.96); }
  75% { transform: translate3d(2vw, 2vh, 0) scale(1.03); }
}

/* NAV */
.nav {
  position: sticky; top: 0; z-index: 50;
  background: rgba(10,10,10,0.82);
  backdrop-filter: saturate(180%) blur(18px);
  -webkit-backdrop-filter: saturate(180%) blur(18px);
  border-bottom: 0.5px solid var(--ink-hair);
}
.nav,
.hero,
section,
footer {
  position: relative;
  z-index: 1;
}
.nav-inner {
  max-width: 1200px; margin: 0 auto;
  padding: 18px 32px;
  display: flex; align-items: center; justify-content: space-between;
  font-size: 12px; letter-spacing: 0.04em;
}
.nav .brand { font-weight: 600; letter-spacing: -0.01em; }
.nav .brand .dot { display: inline-block; width: 7px; height: 7px; background: var(--blue); border-radius: 50%; margin-right: 8px; vertical-align: 2px; }
.nav .meta { font-family: var(--mono); font-size: 11px; color: var(--ink-mute); letter-spacing: 0.08em; }
.nav .cta {
  padding: 9px 18px; border: none; color: #fff;
  font-size: 11.5px; letter-spacing: 0.12em; text-transform: uppercase; cursor: pointer;
  background: var(--blue); transition: background 180ms;
}
.nav .cta:hover { background: var(--blue-hover); }

/* HERO */
.hero { padding: 48px 32px 120px; text-align: center; position: relative; }
.hero .eyebrow {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em; color: var(--ink-mute);
  text-transform: uppercase; margin-bottom: 32px;
}
.hero .eyebrow .sep { display: inline-block; width: 24px; height: 0.5px; background: var(--ink-mute); vertical-align: 4px; margin: 0 12px; }

/* Postcard — ticket with perforation */
.postcard {
  width: min(520px, 92vw);
  margin: 0 auto 56px;
  background: var(--paper);
  color: var(--paper-ink);
  position: relative;
  box-shadow: 0 40px 120px rgba(0,0,0,0.55), 0 0 0 0.5px rgba(245,242,234,0.05);
  display: grid;
  grid-template-columns: 110px 1fr;
  text-align: left;
  font-weight: 400;
}
.postcard .stub {
  padding: 30px 20px; display: flex; flex-direction: column; justify-content: space-between;
  border-right: 1.2px dashed var(--paper-hair);
  background: rgba(20,18,16,0.04);
}
.postcard .stub .label {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.3em; color: var(--paper-mute);
  text-transform: uppercase;
}
.postcard .stub .num {
  font-size: 52px; line-height: 0.9; font-weight: 500; letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
}
.postcard .stub .serial {
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.22em; color: var(--paper-mute);
  font-variant-numeric: tabular-nums;
}
.postcard .body { padding: 32px 36px 30px; position: relative; }
.postcard .kicker {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.3em;
  color: var(--paper-mute); text-transform: uppercase; margin-bottom: 18px;
}
.postcard .title {
  font-size: 22px; line-height: 1.35; font-weight: 500; margin: 0 0 14px;
  letter-spacing: -0.015em;
}
.postcard .sub {
  font-size: 12.5px; line-height: 1.7; color: var(--paper-mute); margin: 0;
}
.postcard .sign {
  margin-top: 26px; padding-top: 14px; border-top: 0.5px solid var(--paper-hair);
  display: flex; justify-content: space-between; align-items: baseline;
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.22em;
  color: var(--paper-mute); text-transform: uppercase;
}
.postcard .sign .name { font-family: "Pretendard Variable", "Pretendard", sans-serif;
  font-size: 12px; letter-spacing: 0; color: var(--paper-ink); text-transform: none; }
/* punch circles */
.postcard::before, .postcard::after {
  content: ""; position: absolute; left: 110px; width: 14px; height: 14px;
  border-radius: 50%; background: var(--paper-perf); transform: translateX(-50%);
}
.postcard::before { top: -7px; }
.postcard::after { bottom: -7px; }

/* HERO title */
.hero h1 {
  max-width: 860px; margin: 0 auto 22px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.28;
  letter-spacing: -0.02em;
  font-weight: 500;
  text-wrap: balance;
}
.hero h1 em { font-style: normal; color: var(--ink-mute); }
.hero .lede {
  max-width: 560px; margin: 0 auto 40px;
  font-size: 15px; line-height: 1.75; color: var(--ink-mute);
  text-wrap: pretty;
}

/* Buttons */
.btn-primary {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 16px 28px; background: var(--blue); color: #fff;
  border: none; font-size: 12.5px; letter-spacing: 0.18em;
  text-transform: uppercase; cursor: pointer; font-weight: 500;
  transition: background 180ms;
}
.btn-primary:hover { background: var(--blue-hover); }
.btn-primary .arrow { display: inline-block; transition: transform 180ms; }
.btn-primary:hover .arrow { transform: translateX(3px); }
.btn-ghost {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 22px; background: transparent; color: var(--ink);
  border: 0.5px solid var(--ink-hair); font-size: 12px;
  letter-spacing: 0.15em; text-transform: uppercase; cursor: pointer;
  transition: border-color 180ms;
}
.btn-ghost:hover { border-color: var(--ink); }

.hero .cta-row { display: flex; gap: 16px; justify-content: center; align-items: center; flex-wrap: wrap; }
.hero .cta-row .btn-primary {
  padding: 16px 13px 12px 28px;
  height: 53px;
  min-width: 173px;
}
.hero .cta-note {
  font-family: var(--mono); font-size: 11px; color: var(--ink-faint);
  letter-spacing: 0.1em;
  max-width: 266px;
}
.letter .sign-off .when { color: #f8f8f8 !important; }
footer .foot-meta { color: #f5ebea; }

/* SECTION SCAFFOLD */
section { padding: 120px 32px; border-top: 0.5px solid var(--ink-hair); }
.section-inner { max-width: var(--maxw); margin: 0 auto; }
.section-inner.wide { max-width: 1160px; }
.section-head {
  display: grid; grid-template-columns: 180px 1fr; gap: 48px;
  margin-bottom: 56px; align-items: baseline;
}
.section-head .no {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em;
  color: var(--ink-faint); text-transform: uppercase;
  padding-top: 8px; border-top: 0.5px solid var(--ink-hair);
}
.section-head .title h2 {
  margin: 0; font-size: clamp(26px, 2.6vw, 34px); font-weight: 500;
  line-height: 1.35; letter-spacing: -0.02em;
}
.section-head .title p {
  margin: 12px 0 0; font-size: 14.5px; line-height: 1.7; color: var(--ink-mute);
  max-width: 640px; text-wrap: pretty;
}

/* LETTER */
.letter {
  max-width: 640px; margin: 0 auto;
  font-size: 16px; line-height: 1.95;
  color: rgba(245, 242, 234, 0.82);
}
.letter .greeting {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.3em;
  color: var(--ink-faint); text-transform: uppercase; margin-bottom: 28px;
  text-align: center;
}
.letter h2 {
  font-size: clamp(28px, 3vw, 36px); font-weight: 500;
  line-height: 1.35; letter-spacing: -0.02em; color: var(--ink);
  margin: 0 0 52px; text-align: center; text-wrap: balance;
}
.letter p { margin: 0 0 22px; text-indent: 1em; text-wrap: pretty; }
.letter p.no-indent { text-indent: 0; }
.letter .divider {
  width: 28px; height: 0.5px; background: var(--ink-hair);
  margin: 40px auto; border: none;
}
.letter .sign-off {
  margin-top: 48px; text-align: right;
}
.letter .sign-off .when {
  font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.22em;
  color: var(--ink-faint); text-transform: uppercase; margin-bottom: 8px;
}
.letter .sign-off .who {
  font-size: 15px; color: var(--ink);
}

/* WEBINAR + FORM BLOCK */
.webinar-wrap {
  display: grid; grid-template-columns: 1.05fr 1fr; gap: 64px; align-items: start;
}
@media (max-width: 880px) { .webinar-wrap { grid-template-columns: 1fr; gap: 48px; } }

.webinar-card {
  background: var(--paper); color: var(--paper-ink);
  padding: 36px 36px 28px; position: relative;
  box-shadow: 0 30px 90px rgba(0,0,0,0.5);
}
.webinar-card .tag {
  display: inline-block; font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.25em; text-transform: uppercase; color: var(--paper-mute);
  padding-bottom: 10px; margin-bottom: 22px;
  border-bottom: 0.5px solid var(--paper-hair); width: 100%;
  display: flex; justify-content: space-between;
}
.webinar-card h3 {
  margin: 0 0 20px; font-size: 24px; font-weight: 500;
  line-height: 1.35; letter-spacing: -0.015em;
}
.webinar-card .meta {
  display: grid; grid-template-columns: 80px 1fr; gap: 12px 16px;
  font-size: 13px; margin: 24px 0 0;
  padding-top: 22px; border-top: 0.5px solid var(--paper-hair);
}
.webinar-card .meta dt {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.22em;
  color: var(--paper-mute); text-transform: uppercase; padding-top: 3px;
}
.webinar-card .meta dd { margin: 0; color: var(--paper-ink); }
.webinar-card .foot {
  margin-top: 26px; padding-top: 14px;
  border-top: 0.5px solid var(--paper-hair);
  display: flex; justify-content: space-between;
  font-family: var(--mono); font-size: 9.5px; letter-spacing: 0.25em;
  color: var(--paper-mute); text-transform: uppercase;
}

.form-block h3 {
  margin: 0 0 8px; font-size: 22px; font-weight: 500;
  line-height: 1.4; letter-spacing: -0.015em;
}
.form-block .form-note {
  margin: 0 0 28px; font-size: 13.5px; line-height: 1.7; color: var(--ink-mute);
}
.form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 18px 20px; }
.form-grid .full { grid-column: 1 / -1; }
.field label {
  display: block; font-family: var(--mono); font-size: 10px;
  letter-spacing: 0.22em; text-transform: uppercase; color: rgba(255, 255, 255, 0.88);
  margin-bottom: 8px;
}
.field label .req { color: var(--ink); margin-left: 4px; }
.field input, .field textarea, .field select {
  width: 100%;
  background: rgba(255, 255, 255, 0.04);
  color: #ffffff;
  border: 0.5px solid rgba(255, 255, 255, 0.22);
  border-bottom-color: rgba(255, 255, 255, 0.3);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.6;
  outline: none;
  transition: border-color 180ms, background 180ms, box-shadow 180ms;
}
.field textarea {
  min-height: 132px;
  resize: vertical;
}
.field input::placeholder, .field textarea::placeholder { color: rgba(255, 255, 255, 0.52); }
.field input:focus, .field textarea:focus, .field select:focus {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(255, 255, 255, 0.72);
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.12);
}
.checkbox {
  display: flex; gap: 12px; align-items: flex-start;
  padding: 16px 18px; border: 0.5px solid var(--ink-hair);
  cursor: pointer; transition: border-color 180ms;
}
.checkbox:hover { border-color: var(--ink-mute); }
.checkbox input { margin: 3px 0 0; accent-color: var(--ink); }
.checkbox .t { font-size: 13px; color: var(--ink); margin-bottom: 4px; }
.checkbox .s { font-size: 11.5px; color: var(--ink-mute); line-height: 1.6; font-family: var(--mono); letter-spacing: 0.05em; }
.form-block .submit-row {
  margin-top: 28px; display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.form-block .fine {
  font-family: var(--mono); font-size: 10px; letter-spacing: 0.12em;
  color: var(--ink-faint); line-height: 1.7;
}
.form-block button[disabled] {
  opacity: 0.72;
  cursor: wait;
}

/* PROGRAM / PILLARS */
.pillars { display: grid; grid-template-columns: repeat(3, 1fr); gap: 32px; }
@media (max-width: 760px) { .pillars { grid-template-columns: 1fr; } }
.pillar {
  padding-top: 22px; border-top: 0.5px solid var(--ink-hair);
}
.pillar .no {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.22em;
  color: var(--ink-faint); text-transform: uppercase; margin-bottom: 14px;
}
.pillar h4 { margin: 0 0 12px; font-size: 19px; font-weight: 500; letter-spacing: -0.01em; }
.pillar p { margin: 0; font-size: 14px; line-height: 1.7; color: var(--ink-mute); }

/* BENEFITS grid */
.benefits { display: grid; grid-template-columns: repeat(2, 1fr); gap: 0; border-top: 0.5px solid var(--ink-hair); border-left: 0.5px solid var(--ink-hair); }
@media (max-width: 720px) { .benefits { grid-template-columns: 1fr; } }
.benefit {
  padding: 32px 28px;
  border-right: 0.5px solid var(--ink-hair);
  border-bottom: 0.5px solid var(--ink-hair);
}
.benefit .no { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.25em; color: var(--ink-faint); text-transform: uppercase; margin-bottom: 16px; }
.benefit h4 { margin: 0 0 10px; font-size: 17px; font-weight: 500; letter-spacing: -0.005em; }
.benefit p { margin: 0; font-size: 13.5px; line-height: 1.7; color: var(--ink-mute); }

/* FAQ */
.faq { border-top: 0.5px solid var(--ink-hair); }
.faq details {
  border-bottom: 0.5px solid var(--ink-hair);
  padding: 24px 0; cursor: pointer;
}
.faq summary {
  list-style: none; display: flex; justify-content: space-between; align-items: center;
  font-size: 16.5px; font-weight: 500; letter-spacing: -0.005em;
}
.faq summary::-webkit-details-marker { display: none; }
.faq summary .plus { font-family: var(--mono); color: var(--ink-mute); transition: transform 200ms; }
.faq details[open] summary .plus { transform: rotate(45deg); }
.faq details p {
  margin: 16px 0 4px; font-size: 14px; line-height: 1.8;
  color: var(--ink-mute); max-width: 720px; text-wrap: pretty;
}

/* PARTNERS */
.partners {
  display: flex; flex-wrap: wrap; gap: 40px 64px; align-items: baseline;
  padding-top: 24px; border-top: 0.5px solid var(--ink-hair);
}
.partners .item {
  font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em;
  color: var(--ink-mute); text-transform: uppercase;
}
.partners .item strong { color: var(--ink); font-weight: 500; margin-right: 8px; font-family: "Pretendard Variable","Pretendard",sans-serif; letter-spacing: 0; font-size: 14px; }

/* FOOTER */
footer {
  padding: 64px 32px 48px; border-top: 0.5px solid var(--ink-hair);
  font-size: 12px; color: var(--ink-mute);
}
footer .foot-inner { max-width: 1200px; margin: 0 auto; display: flex; justify-content: space-between; flex-wrap: wrap; gap: 24px; }
footer .foot-meta { font-family: var(--mono); font-size: 10.5px; letter-spacing: 0.15em; }

/* Membership modal-ish callout */
.success-note {
  display: none; margin-top: 20px; padding: 18px 22px;
  border: 0.5px solid var(--ink); font-size: 13px; color: var(--ink);
  line-height: 1.7;
}
.success-note.is-visible { display: block; }
.success-note.is-error {
  border-color: rgba(255, 137, 137, 0.9);
  color: #ffd7d7;
}
.success-note .code {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.15em;
  padding: 4px 10px; background: var(--ink); color: var(--bg); margin-right: 6px; display: inline-block; margin-top: 6px;
}

/* Responsive */
@media (max-width: 720px) {
  .nav-inner { padding: 14px 18px; gap: 10px; }
  .nav .meta { display: none; }
  .section-head { grid-template-columns: 1fr; gap: 14px; margin-bottom: 36px; }
  .form-grid { grid-template-columns: 1fr; }
  .hero { padding: 40px 18px 64px; }
  .hero .eyebrow { margin-bottom: 24px; font-size: 10px; letter-spacing: 0.22em; }
  .hero .eyebrow .sep { margin: 0 8px; width: 16px; }
  .hero h1 { font-size: 26px; line-height: 1.3; margin-bottom: 16px; }
  .hero .lede { font-size: 14px; margin-bottom: 28px; }
  .hero .cta-row { flex-direction: column; gap: 12px; }
  .hero .cta-note { font-size: 10px; text-align: center; }
  section { padding: 64px 18px; }
  .postcard { grid-template-columns: 88px 1fr; margin-bottom: 40px; }
  .postcard::before, .postcard::after { left: 88px; }
  .postcard .stub { padding: 22px 14px; }
  .postcard .stub .num { font-size: 40px; }
  .postcard .body { padding: 24px 22px 22px; }
  .postcard .title { font-size: 18px; }
  .postcard .sub { font-size: 12px; }
  .letter { font-size: 15px; line-height: 1.9; }
  .letter h2 { font-size: 24px; margin-bottom: 36px; }
  .webinar-card { padding: 26px 22px 22px; }
  .webinar-card h3 { font-size: 20px; }
  .form-block h3 { font-size: 19px; }
  .btn-primary { padding: 14px 22px; font-size: 11.5px; letter-spacing: 0.15em; }
  footer .foot-inner { flex-direction: column; }
  footer .foot-meta[style*='right'] { text-align: left !important; }
}

/* Tweaks panel — ticket copy variations */
.ak-tweaks-panel {
  position: fixed; right: 20px; bottom: 20px; z-index: 100;
  background: #0a0a0a; border: 1px solid rgba(255,255,255,0.14);
  padding: 14px 14px 10px; min-width: 220px; max-width: 260px;
  color: #fff; box-shadow: 0 20px 60px rgba(0,0,0,0.6);
  transition: all 240ms ease;
}
.ak-tweaks-panel.is-collapsed {
  min-width: 0; padding: 0; width: 42px; height: 42px;
  border-radius: 50%; cursor: pointer;
  background: var(--blue);
  display: flex; align-items: center; justify-content: center;
}
.ak-tweaks-panel.is-collapsed::before {
  content: ""; width: 10px; height: 10px; background: #fff; border-radius: 50%;
}
.ak-tweaks-panel.is-collapsed > * { display: none; }
.ak-tw-head {
  display: flex; align-items: center; gap: 8px;
  font-size: 10px; letter-spacing: 0.22em; text-transform: uppercase;
  color: rgba(255,255,255,0.6); padding-bottom: 10px;
  border-bottom: 0.5px solid rgba(255,255,255,0.14); margin-bottom: 8px;
}
.ak-tw-dot { width: 6px; height: 6px; background: var(--blue); border-radius: 50%; }
.ak-tw-close {
  margin-left: auto; background: transparent; border: none;
  color: rgba(255,255,255,0.5); cursor: pointer; font-size: 18px;
  line-height: 1; padding: 0 4px;
}
.ak-tw-close:hover { color: #fff; }
.ak-tw-list { display: flex; flex-direction: column; gap: 2px; }
.ak-tw-item {
  display: flex; align-items: center; gap: 10px;
  background: transparent; border: none; color: rgba(255,255,255,0.65);
  padding: 8px 6px; font-size: 12.5px; cursor: pointer;
  text-align: left; letter-spacing: -0.005em;
  font-family: inherit; transition: color 160ms, background 160ms;
}
.ak-tw-item:hover { color: #fff; background: rgba(255,255,255,0.04); }
.ak-tw-item.is-active { color: #fff; }
.ak-tw-item.is-active .ak-tw-idx { color: var(--blue); }
.ak-tw-idx {
  font-size: 10.5px; letter-spacing: 0.18em; color: rgba(255,255,255,0.35);
  min-width: 22px;
}
@media (max-width: 720px) {
  .ak-tweaks-panel { right: 12px; bottom: 12px; }
  .ak-tweaks-panel:not(.is-collapsed) { min-width: 200px; }
}