:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #191f28;
  --sub: #6b7684;
  --line: #e5e8eb;
  --blue: #3182f6;
  --blue-dark: #1b64da;
  --red: #f04452;
  --green: #12b76a;
  --amber: #f59e0b;
}
* { margin: 0; padding: 0; box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo", "Pretendard", "Noto Sans KR", "Malgun Gothic", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
.wrap { max-width: 640px; margin: 0 auto; padding: 0 16px; }

.top { position: sticky; top: 0; background: rgba(247, 248, 250, 0.92); backdrop-filter: blur(8px); border-bottom: 1px solid var(--line); z-index: 10; }
.top-in { display: flex; align-items: center; height: 56px; }
.logo { font-size: 20px; font-weight: 800; color: var(--text); text-decoration: none; letter-spacing: -0.5px; }

.hero { padding: 32px 0 20px; }
.hero h1 { font-size: 26px; font-weight: 800; letter-spacing: -0.5px; }
.hero p { color: var(--sub); font-size: 15px; margin-top: 8px; }

.panel { background: var(--card); border: 1px solid var(--line); border-radius: 14px; padding: 20px; margin-top: 16px; }
.panel h2, .panel h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; }
.steps { padding-left: 20px; color: var(--sub); font-size: 14px; margin-bottom: 16px; }
.steps li { margin: 4px 0; }
.steps li::marker { color: var(--blue); font-weight: 700; }

.field-label { display: block; font-size: 14px; font-weight: 700; color: var(--sub); margin: 12px 0 6px; }
textarea, input[type="text"], input[type="number"] {
  width: 100%; border: 1px solid var(--line); border-radius: 10px; padding: 12px;
  font-size: 14px; font-family: inherit; background: var(--bg); color: var(--text);
}
textarea:focus, input:focus { outline: 2px solid var(--blue); outline-offset: -1px; }
.privacy { color: var(--green); font-size: 13px; margin: 8px 0 12px; }
.btn-main { width: 100%; background: var(--blue); color: #fff; border: 0; border-radius: 12px; padding: 14px; font-size: 16px; font-weight: 700; cursor: pointer; }
.btn-main:active { background: var(--blue-dark); }
.btn-main:disabled { opacity: 0.5; }

.manual { margin-top: 14px; }
.manual summary { color: var(--sub); font-size: 14px; font-weight: 600; cursor: pointer; }
.manual-fields { padding-top: 4px; }
.manual-fields .btn-main { margin-top: 14px; }
.input-msg { color: var(--red); font-size: 13px; min-height: 18px; margin-top: 10px; }

.result { margin-top: 8px; }
.result > h2 { font-size: 20px; font-weight: 800; margin-top: 24px; }

.spec-cards { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 12px; }
.spec-card { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px 14px; }
.spec-card .k { font-size: 12px; color: var(--sub); font-weight: 700; }
.spec-card .v { font-size: 14px; font-weight: 600; margin-top: 2px; word-break: break-all; }

.grade-card { background: var(--text); color: #fff; border-radius: 14px; padding: 24px 20px; margin-top: 16px; text-align: center; }
.grade-card .letter { font-size: 56px; font-weight: 800; line-height: 1.1; }
.grade-card .letter.unknown { font-size: 22px; }
.grade-card .comment { font-size: 15px; margin-top: 8px; opacity: 0.85; }

.uc-row { display: flex; justify-content: space-between; align-items: center; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.uc-row:last-child { border-bottom: 0; }
.badge { font-size: 13px; font-weight: 700; border-radius: 6px; padding: 3px 10px; }
.badge.good { background: #eaf9f1; color: var(--green); }
.badge.ok { background: #fff7e6; color: var(--amber); }
.badge.bad { background: #ffeef0; color: var(--red); }

.price-row { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 15px; flex-wrap: wrap; }
.price-row:last-child { border-bottom: 0; }
.price-row .part { font-weight: 600; }
.price-row .won { font-weight: 700; }
.price-row .cnt { color: var(--sub); font-size: 13px; }
.price-total { margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); font-size: 15px; }
.price-total .won { font-size: 18px; font-weight: 800; color: var(--blue-dark); }
.price-note, .muted { color: var(--sub); font-size: 13px; margin-top: 6px; }

.upgrade-item { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.upgrade-item:last-child { border-bottom: 0; }
.upgrade-item a { display: inline-block; margin-top: 6px; color: var(--blue-dark); font-weight: 700; font-size: 14px; text-decoration: none; }
.upgrade-item a:hover { text-decoration: underline; }

.disclaim { color: var(--sub); font-size: 12px; margin: 16px 0 8px; }

.foot { border-top: 1px solid var(--line); margin-top: 40px; padding: 24px 0; color: var(--sub); font-size: 13px; }
.foot a { color: var(--sub); }
.foot p + p { margin-top: 6px; }