/* Brand tokens */
:root {
  --black: #000204;
  --white: #ffffff;
  --green: #28d27d;
  --gray-500: #72787f;
  --gray-700: #464c53;
  --font-heading: "Helvetica Now Display", "Helvetica Neue", Helvetica, Arial, sans-serif;
  --font-body: "Pretendard", "Helvetica Neue", Helvetica, Arial, sans-serif;
}

/* Global reset */
* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--black);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--green); text-decoration: none; }
a:hover, a:focus-visible { text-decoration: underline; }

.site-header {
  max-width: 1080px;
  margin: 4rem auto 2rem;
  text-align: center;
}

.brand {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  letter-spacing: 0.5px;
  font-weight: 700;
  display: inline-block;
}

.tagline {
  margin-top: 0.5rem;
  font-size: 1rem;
  font-weight: 700;
  color: var(--gray-500);
}

/* Grid of cards */
.link-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
  max-width: 1080px;
  margin: 0 auto 4rem;
  padding: 0 1rem;
}

.card {
  border: 1px solid var(--gray-700);
  border-radius: 4px;
  padding: 1.75rem 1.5rem;
  transition: border-color 0.25s, transform 0.25s;
}

.card h2 {
  font-family: var(--font-heading);
  font-weight: 600;
  margin-bottom: 0.5rem;
  font-size: 1.25rem;
  color: var(--white);
}

.card p { font-size: 0. Nine-fiverem; color: var(--gray-700); }

.card:hover,
.card:focus-within {
  border-color: var(--green);
  transform: translateY(-4px);
}

.site-footer {
  text-align: center;
  font-size: 0. Eight-fiverem;
  padding: 2rem 1rem;
  color: var(--gray-700);
  border-top: 1px solid var(--gray-700);
}

.brand-logo {
  width: clamp(120px, 20vw, 240px);
  height: auto;
  display: block;
  margin: 0 auto;
}

.collapsible summary {
  list-style: none;              /* remove default ▸ */
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: .5rem;
}

.collapsible summary::-webkit-details-marker { display: none; }

.collapsible[open] summary::before,
.collapsible summary::before {
  content: "▸";
  transition: transform .25s;
  font-size: .85rem;
  color: var(--green);
}
.collapsible[open] summary::before { transform: rotate(90deg); }

.link-list { margin-top: 1rem; padding-left: 1rem; }
.link-list li { margin-bottom: .25rem; }
.link-list a { color: var(--white); }
.link-list a:hover { color: var(--green); }

.collapsible:hover,
.collapsible:focus-within { border-color: var(--green); transform: translateY(-4px); }

.collapsible summary h2 { margin: 0; }

.contact-card form {
  display: grid;
  gap: 1rem;
}

.contact-card input[type=email],
.contact-card select {
  width: 100%;
  padding: .65rem .8rem;
  border: 1px solid var(--gray-700);
  border-radius: 4px;
  background: var(--black);
  color: var(--white);
  font: inherit;
}

.contact-card input[type=email]:focus,
.contact-card select:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 1px var(--green);
}

.contact-card fieldset {
  border: 0;
  padding: 0;
  display: grid;
  gap: .35rem;
}
.contact-card legend {
  font-size: .9rem;
  margin-bottom: .25rem;
  color: var(--white);
}
.contact-card label {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-size: .85rem;
  cursor: pointer;
}

.contact-card button {
  justify-self: start;
  padding: .6rem 1.2rem;
  background: var(--green);
  color: var(--black);
  border: none;
  border-radius: 4px;
  font-weight: 600;
  cursor: pointer;
}
.contact-card button:hover { filter: brightness(1.1); }

.contact-card input[type=email] {
  width: 90%;
}

.privacy-note {
  display: block;
  font-size: .7rem;
  color: var(--gray-700);
  margin-top: .5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden; clip: rect(0 0 0 0);
  border: 0;
}