:root {
  --bg: #0f1115;
  --card: #1a1d24;
  --border: #2a2e37;
  --text: #e7e9ee;
  --muted: #9aa0ab;
  --accent: #5b8def;
  --error: #ef5b5b;
}

* { box-sizing: border-box; }

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

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  border-bottom: 1px solid var(--border);
}

.nav .brand { font-weight: 700; color: var(--text); text-decoration: none; font-size: 18px; }
.nav nav a { color: var(--muted); text-decoration: none; margin-left: 20px; }
.nav nav a:hover { color: var(--text); }
.nav .credits { color: var(--accent); margin-left: 20px; }

.container { max-width: 720px; margin: 40px auto; padding: 0 20px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 28px;
  margin-bottom: 24px;
}
.card.narrow { max-width: 400px; margin: 60px auto; }

h1 { margin-top: 0; font-size: 22px; }
h2 { font-size: 16px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.04em; }

label { display: block; margin-bottom: 16px; font-size: 14px; color: var(--muted); }
input, textarea {
  width: 100%;
  margin-top: 6px;
  padding: 10px 12px;
  background: #12141a;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  font-size: 14px;
}

button, .button {
  display: inline-block;
  background: var(--accent);
  color: white;
  border: none;
  padding: 10px 18px;
  border-radius: 8px;
  font-size: 14px;
  cursor: pointer;
  text-decoration: none;
}
button:hover, .button:hover { opacity: 0.9; }

.muted { color: var(--muted); font-size: 14px; }
.error { color: var(--error); }
.notice { color: var(--accent); }

.result { white-space: pre-wrap; background: #12141a; padding: 16px; border-radius: 8px; }

.history { width: 100%; border-collapse: collapse; }
.history th, .history td { text-align: left; padding: 8px 0; border-bottom: 1px solid var(--border); color: var(--muted); font-size: 14px; }

.pricing-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.price { font-size: 28px; font-weight: 700; margin: 8px 0; }