:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --accent: #0071e3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Pretendard Variable", "Apple SD Gothic Neo", sans-serif;
  background: var(--bg);
  color: var(--text);
}

.shell {
  max-width: 980px;
  margin: 0 auto;
  padding: 24px 16px 64px;
}

.hero {
  margin: 8px 0 20px;
}

.hero .eyebrow {
  color: var(--accent);
  margin: 0 0 8px;
  font-weight: 600;
}

.hero h1 {
  margin: 0 0 12px;
  font-size: clamp(28px, 4.5vw, 44px);
}

.hero p {
  margin: 0;
  color: var(--muted);
}

.stack {
  display: grid;
  gap: 16px;
}

.card {
  background: var(--surface);
  border-radius: 24px;
  padding: 20px;
  box-shadow: 0 12px 30px rgba(15, 23, 42, 0.08);
}

.form-grid {
  display: grid;
  gap: 12px;
}

label {
  display: grid;
  gap: 6px;
  font-size: 14px;
  color: var(--muted);
}

input,
select,
button {
  font: inherit;
}

input,
select {
  border: 1px solid #d2d2d7;
  border-radius: 12px;
  padding: 12px;
  color: var(--text);
  background: #fff;
}

.inline {
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px;
}

button.primary,
button.secondary {
  border-radius: 12px;
  border: 0;
  padding: 12px 16px;
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  color: #fff;
  font-weight: 600;
}

button.secondary {
  background: #e8f1ff;
  color: #004999;
}

.hidden {
  display: none !important;
}

.spinner {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 4px solid #dbeafe;
  border-top-color: var(--accent);
  animation: spin 0.9s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.result-header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}

.pillars {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 8px;
  margin: 10px 0 12px;
}

.pillars span {
  display: flex;
  justify-content: space-between;
  padding: 10px 12px;
  background: #f8fafc;
  border-radius: 12px;
}

.elements {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 8px;
}

.elements .item {
  text-align: center;
  background: #f1f5f9;
  border-radius: 10px;
  padding: 8px 4px;
}

.ads-block {
  margin: 20px 0;
  min-height: 50px;
}

.tabs {
  margin-top: 12px;
}

.tab-buttons {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 8px;
}

.tab-buttons button {
  border-radius: 10px;
  border: 1px solid #d2d2d7;
  padding: 10px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

.tab-buttons button.active {
  border-color: var(--accent);
  color: var(--accent);
  background: #f0f7ff;
  font-weight: 600;
}

.tab-content {
  margin-top: 12px;
  border-radius: 14px;
  background: #fafafa;
  padding: 14px;
}

.tab-content ul {
  margin: 0;
  padding-left: 18px;
  display: grid;
  gap: 8px;
}

.premium {
  margin-top: 8px;
  padding: 14px;
  background: #f8fafc;
  border-radius: 14px;
}

.premium h3,
.premium p {
  margin: 0 0 10px;
}

#premium-content {
  margin-top: 10px;
  display: grid;
  gap: 10px;
}

#premium-content .detail {
  background: #fff;
  border: 1px solid #e5e7eb;
  border-radius: 10px;
  padding: 10px;
}

@media (max-width: 768px) {
  .tab-buttons {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .elements {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}