:root {
  --bg: #1a1a2e;
  --bg2: #22223a;
  --bg3: #2a2a45;
  --text: #e8e8f0;
  --text2: #a0a0b8;
  --text3: #6b6b85;
  --primary: #d97706;
  --primary-light: #f59e0b;
  --accent: #e74c5a;
  --border: #333355;
  --transition: all .15s;
  --success: #4ade80;
  --warning: #fbbf24;
  --danger: #ef4444;
  --info: #60a5fa;
}
[data-theme="light"] {
  --bg: #f5f5fa;
  --bg2: #fff;
  --bg3: #eee;
  --text: #1a1a2e;
  --text2: #555;
  --text3: #999;
  --primary: #b45309;
  --primary-light: #d97706;
  --border: #ddd;
  --accent: #e74c5a;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'Pretendard Variable', -apple-system, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}

/* Header */
.header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; background: var(--bg2);
  border-bottom: 2px solid var(--border);
  position: sticky; top: 0; z-index: 100;
}
.header h1 { font-size: 1.1rem; font-weight: 800; }
.back-btn {
  color: var(--primary); text-decoration: none; font-size: .9rem;
  font-weight: 600; padding: 6px 12px; background: var(--bg2);
  border: 1px solid var(--border); transition: var(--transition);
}
.back-btn:hover { background: var(--primary); color: #fff; }
.theme-btn {
  background: var(--bg2); border: 1px solid var(--border);
  padding: 6px 10px; cursor: pointer; font-size: 1rem;
}

/* Container */
.container {
  max-width: 600px; margin: 0 auto; padding: 16px;
}

/* Calc Card */
.calc-card {
  background: var(--bg2); border: 2px solid var(--border);
  padding: 24px 20px; margin-bottom: 16px;
}
.calc-card h2 {
  font-size: 1.2rem; font-weight: 800; margin-bottom: 4px;
}
.calc-desc {
  font-size: .82rem; color: var(--text2); margin-bottom: 20px;
}
.calc-notice {
  font-size: .75rem; color: var(--warning); margin-bottom: 16px;
  padding: 8px 12px; background: rgba(251,191,36,.08);
  border: 1px solid rgba(251,191,36,.2);
}

/* Form */
.form-group { margin-bottom: 16px; }
.input-hint {
  font-size: .72rem; color: var(--text3); margin-top: 4px; line-height: 1.4;
}
.form-group label {
  display: block; font-size: .82rem; font-weight: 700;
  color: var(--text2); margin-bottom: 6px;
}
.input-field {
  width: 100%; padding: 10px 12px; background: var(--bg);
  border: 2px solid var(--border); color: var(--text);
  font-size: .9rem; font-family: inherit; transition: var(--transition);
  appearance: none; -webkit-appearance: none;
}
select.input-field {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%23a0a0b8' stroke-width='2'%3E%3Cpath d='M6 9l6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 12px center;
  padding-right: 36px;
}
.input-field:focus {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(217,119,6,.15);
}

/* Radio Group */
.radio-group { display: flex; gap: 6px; flex-wrap: wrap; }
.radio-btn {
  flex: 1; min-width: 0; padding: 8px 6px; background: var(--bg);
  border: 2px solid var(--border); color: var(--text2);
  font-size: .8rem; font-weight: 600; cursor: pointer;
  text-align: center; transition: var(--transition); font-family: inherit;
}
.radio-btn.active {
  background: var(--primary); border-color: var(--primary); color: #fff;
}
.radio-btn:hover:not(.active) { border-color: var(--primary); color: var(--primary); }

/* Button */
.btn-calc {
  width: 100%; padding: 14px; background: var(--primary);
  border: 2px solid var(--primary); color: #fff;
  font-size: .95rem; font-weight: 800; cursor: pointer;
  transition: var(--transition); font-family: inherit;
}
.btn-calc:hover {
  transform: translate(-2px, -2px);
  box-shadow: 3px 3px 0 rgba(217,119,6,.3);
}
.btn-calc:active { transform: translate(0,0); box-shadow: none; }

/* Result */
.result-area { margin-top: 16px; }
.result-card {
  background: var(--bg); border: 2px solid var(--border);
  padding: 20px; animation: slideUp .3s ease;
}
.result-title {
  font-size: .8rem; font-weight: 700; color: var(--text2);
  margin-bottom: 12px; text-transform: uppercase; letter-spacing: .5px;
}
.result-row {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px 0; border-bottom: 1px solid var(--border);
}
.result-row:last-child { border-bottom: none; }
.result-label { font-size: .85rem; color: var(--text2); }
.result-value { font-size: .95rem; font-weight: 800; }
.result-value.danger { color: var(--danger); }
.result-value.warning { color: var(--warning); }
.result-value.success { color: var(--success); }
.result-value.info { color: var(--info); }

.result-highlight {
  text-align: center; padding: 16px;
  margin-top: 12px; background: rgba(217,119,6,.08);
  border: 1px solid rgba(217,119,6,.2);
}
.result-highlight .big-num {
  font-size: 2rem; font-weight: 800; color: var(--primary);
  display: block;
}
.result-highlight .big-label {
  font-size: .78rem; color: var(--text2); margin-top: 4px;
}

.result-notice {
  font-size: .72rem; color: var(--text3); margin-top: 12px;
  line-height: 1.5;
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(12px); }
  to { opacity: 1; transform: translateY(0); }
}

@media (max-width: 400px) {
  .radio-group { gap: 4px; }
  .radio-btn { font-size: .72rem; padding: 7px 4px; }
  .tab-btn { font-size: .78rem; padding: 10px 6px; }
}