:root {
  color-scheme: light;
  --bg-top: #f5fbff;
  --bg-bottom: #fff8ef;
  --surface: rgba(255, 255, 255, 0.88);
  --surface-strong: #ffffff;
  --line: #d9e4f3;
  --line-soft: #e8eef6;
  --text: #0f172a;
  --text-muted: #5b6477;
  --sky: #0ea5e9;
  --mint: #14b8a6;
  --shadow: 0 18px 60px rgba(148, 163, 184, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(14, 165, 233, 0.16), transparent 32%),
    radial-gradient(circle at bottom right, rgba(245, 158, 11, 0.14), transparent 34%),
    linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  color: var(--text);
  font-family: "Aptos", "Inter", "Noto Sans KR", "Segoe UI", sans-serif;
}

a {
  color: inherit;
}

button,
input {
  font: inherit;
}

.page-shell {
  max-width: 1240px;
  margin: 0 auto;
  padding: 28px 18px 36px;
}

.hero-card,
.control-card,
.preview-card {
  border: 1px solid rgba(217, 228, 243, 0.9);
  border-radius: 28px;
  background: var(--surface);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  padding: 30px 30px 28px;
  overflow: hidden;
}

.hero-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.hero-copy {
  max-width: 760px;
}

.eyebrow {
  display: inline-flex;
  margin: 0 0 16px;
  padding: 7px 12px;
  border-radius: 999px;
  background: #ebf9ff;
  color: #0369a1;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-card h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3.2rem);
  line-height: 1.06;
  letter-spacing: -0.04em;
}

.hero-text {
  margin: 16px 0 0;
  max-width: 720px;
  color: var(--text-muted);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.8;
}

.hero-text-ko {
  color: #6b7280;
}

.hero-link {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  text-decoration: none;
  font-size: 14px;
  font-weight: 800;
  transition: 160ms ease;
}

.hero-link:hover {
  transform: translateY(-1px);
  border-color: #bfdbfe;
  background: #f8fbff;
}

.studio-grid {
  display: grid;
  gap: 22px;
  margin-top: 22px;
  grid-template-columns: 360px minmax(0, 1fr);
}

.control-card,
.preview-card {
  padding: 24px;
}

.section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
}

.section-head h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.section-head p {
  margin: 8px 0 0;
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.7;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 72px;
  min-height: 30px;
  padding: 0 12px;
  border-radius: 999px;
  background: #f1f5f9;
  color: #64748b;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.status-pill[data-status="loading"] {
  background: #ecfeff;
  color: #0f766e;
}

.status-pill[data-status="preview"] {
  background: #fffbeb;
  color: #b45309;
}

.status-pill[data-status="error"] {
  background: #fff1f2;
  color: #be123c;
}

.field-group {
  margin-top: 22px;
}

.field-group label,
.group-label {
  display: block;
  margin-bottom: 10px;
  font-size: 14px;
  font-weight: 800;
  color: #334155;
}

#handle-input {
  width: 100%;
  min-height: 54px;
  padding: 0 16px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: #f8fbff;
  color: var(--text);
  font-size: 17px;
  font-weight: 700;
  outline: none;
  transition: 160ms ease;
}

#handle-input:focus {
  border-color: #7dd3fc;
  box-shadow: 0 0 0 5px rgba(14, 165, 233, 0.12);
  background: #ffffff;
}

.version-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.version-card {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: #ffffff;
  cursor: pointer;
  transition: 160ms ease;
}

.version-card:hover {
  transform: translateY(-1px);
  border-color: #bfdbfe;
  background: #fbfdff;
}

.version-card input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.version-card-active {
  border-color: #7dd3fc;
  background: #f0f9ff;
  box-shadow: inset 0 0 0 1px rgba(14, 165, 233, 0.22);
}

.version-title {
  font-size: 18px;
  font-weight: 900;
}

.version-note {
  color: var(--text-muted);
  font-size: 14px;
  font-weight: 600;
}

.button-row {
  display: grid;
  gap: 12px;
  margin-top: 24px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.primary-button,
.secondary-button {
  min-height: 52px;
  padding: 0 16px;
  border-radius: 18px;
  border: 1px solid transparent;
  font-size: 15px;
  font-weight: 900;
  cursor: pointer;
  transition: 160ms ease;
}

.primary-button {
  background: #0f172a;
  color: #ffffff;
}

.primary-button:hover {
  background: #1e293b;
}

.secondary-button {
  border-color: var(--line);
  background: #ffffff;
  color: #0f172a;
}

.secondary-button:hover:not(:disabled) {
  border-color: #bfdbfe;
  background: #f8fbff;
}

.secondary-button:disabled {
  cursor: not-allowed;
  border-color: var(--line-soft);
  background: #f8fafc;
  color: #94a3b8;
}

.info-card,
.message-card {
  margin-top: 16px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid var(--line-soft);
  background: #f8fbff;
}

.info-label {
  margin: 0 0 10px;
  color: #94a3b8;
  font-size: 11px;
  font-weight: 900;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

#api-url {
  display: block;
  word-break: break-all;
  color: #334155;
  font-size: 13px;
  font-weight: 700;
  line-height: 1.7;
}

.message-card {
  color: #475569;
  font-size: 14px;
  font-weight: 700;
  line-height: 1.7;
}

.message-card.is-error {
  border-color: #fecaca;
  background: #fff1f2;
  color: #be123c;
}

.preview-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: #ffffff;
  text-decoration: none;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.preview-link[aria-disabled="true"] {
  cursor: not-allowed;
  border-color: var(--line-soft);
  background: #f8fafc;
  color: #94a3b8;
  pointer-events: none;
}

.preview-stage {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 420px;
  margin-top: 18px;
  padding: 18px;
  border-radius: 28px;
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(circle at top, rgba(14, 165, 233, 0.08), transparent 34%),
    linear-gradient(180deg, #fbfdff 0%, #ffffff 100%);
}

.preview-empty {
  text-align: center;
  color: #64748b;
}

.preview-empty-title {
  margin: 0;
  font-size: 24px;
  font-weight: 900;
}

.preview-empty-copy {
  margin: 10px 0 0;
  font-size: 14px;
  font-weight: 600;
  line-height: 1.8;
}

.preview-image {
  width: min(100%, 760px);
  height: auto;
  border-radius: 24px;
}

@media (max-width: 980px) {
  .studio-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .page-shell {
    padding-inline: 14px;
  }

  .hero-card,
  .control-card,
  .preview-card {
    padding: 18px;
    border-radius: 24px;
  }

  .hero-card {
    flex-direction: column;
  }

  .button-row,
  .version-grid {
    grid-template-columns: 1fr;
  }

  .preview-stage {
    min-height: 260px;
    padding: 12px;
    border-radius: 22px;
  }
}