:root {
  --bg: #f4f7fb;
  --surface: #ffffff;
  --surface-alt: #eef4ff;
  --text: #172033;
  --muted: #667085;
  --primary: #2563eb;
  --primary-dark: #1d4ed8;
  --border: #d8e2f0;
  --shadow: 0 18px 40px rgba(15, 23, 42, 0.08);
  --radius: 20px;
  --max-width: 1160px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans KR", sans-serif;
  background:
    radial-gradient(circle at top left, rgba(96, 165, 250, 0.15), transparent 26%),
    linear-gradient(180deg, #f8fbff 0%, var(--bg) 100%);
  color: var(--text);
  line-height: 1.6;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(37, 99, 235, 0.02) 1px, transparent 1px), linear-gradient(90deg, rgba(37, 99, 235, 0.02) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.6), transparent);
}

a {
  color: inherit;
  text-decoration: none;
}

.container {
  width: min(calc(100% - 32px), var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(16px);
  background: rgba(248, 251, 255, 0.88);
  border-bottom: 1px solid rgba(216, 226, 240, 0.9);
}

.site-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  letter-spacing: -0.02em;
}

.brand-badge {
  width: 40px;
  height: 40px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--primary), #60a5fa);
  color: #fff;
  box-shadow: var(--shadow);
}

.header-link {
  font-size: 0.95rem;
  color: var(--muted);
}

.header-link:hover {
  color: var(--primary);
}

.hero {
  padding: 56px 0 24px;
}

.hero-card,
.card,
.result-card,
.summary-item,
.note-box,
.tip-list li {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.hero-card {
  padding: 34px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  margin-bottom: 16px;
  border-radius: 999px;
  background: var(--surface-alt);
  color: var(--primary);
  font-weight: 700;
  font-size: 0.92rem;
}

h1,
.h2,
.h3 {
  letter-spacing: -0.03em;
}

h1 {
  margin: 0;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1.12;
}

.hero-card p {
  margin: 16px 0 0;
  max-width: 62ch;
  color: var(--muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 18px;
  border-radius: 12px;
  font-weight: 700;
}

.btn-primary {
  background: var(--primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--primary-dark);
}

.btn-secondary {
  border: 1px solid var(--border);
  background: #fff;
}

.page-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 22px;
  align-items: start;
}

.card,
.result-card {
  padding: 24px;
}

.section-title {
  margin: 0 0 16px;
  font-size: 1.25rem;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.field {
  display: grid;
  gap: 8px;
}

.field-full {
  grid-column: 1 / -1;
}

label {
  font-weight: 700;
  font-size: 0.95rem;
}

input,
select {
  width: 100%;
  padding: 14px 15px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fcfdff;
  color: var(--text);
  font: inherit;
}

input:focus,
select:focus {
  outline: 2px solid rgba(37, 99, 235, 0.18);
  border-color: #9bb8ff;
}

.checkbox-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 14px 15px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fcfdff;
}

.checkbox-row input {
  width: 18px;
  height: 18px;
  margin: 0;
}

.helper {
  margin: 4px 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.result-main {
  padding: 20px;
  border-radius: 18px;
  background: linear-gradient(135deg, #ecf4ff, #f8fbff);
  border: 1px solid #cfe0ff;
}

.result-main .label {
  display: block;
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 0.92rem;
}

.result-main strong {
  display: block;
  font-size: clamp(1.8rem, 4vw, 2.7rem);
  line-height: 1.1;
  letter-spacing: -0.04em;
}

.summary-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-top: 14px;
}

.summary-item {
  padding: 16px;
}

.summary-item span {
  display: block;
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 4px;
}

.summary-item strong {
  font-size: 1.1rem;
  letter-spacing: -0.02em;
}

.note-box {
  padding: 22px;
  margin-top: 22px;
}

.note-box h2,
.note-box h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.note-box p,
.note-box li {
  margin: 0;
  color: var(--muted);
}

.tip-list {
  list-style: none;
  padding: 0;
  margin: 14px 0 0;
  display: grid;
  gap: 10px;
}

.tip-list li {
  padding: 14px 16px;
}

.formula {
  margin-top: 12px;
  padding: 14px 16px;
  border-radius: 14px;
  background: #f8fbff;
  border: 1px dashed #c9d8ef;
  font-weight: 600;
  color: #30415f;
}

.footer {
  padding: 28px 0 56px;
  color: var(--muted);
  font-size: 0.92rem;
}

.footer-inner {
  border-top: 1px solid var(--border);
  padding-top: 18px;
}

@media (max-width: 900px) {
  .page-grid,
  .form-grid,
  .summary-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 720px) {
  .site-header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    padding-top: 34px;
  }

  .hero-card,
  .card,
  .result-card,
  .note-box {
    padding: 20px;
  }
}