/* QR 코드 생성기 */
:root {
  --bg: #f8fafc;
  --card: #ffffff;
  --border: #e2e8f0;
  --text: #1e293b;
  --muted: #64748b;
  --teal: #0d9488;
  --teal2: #0f766e;
  --teal-light: rgba(13,148,136,.08);
  --radius: 14px;
  --shadow: 0 2px 12px rgba(0,0,0,.07);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { background: var(--bg); color: var(--text); font-family: 'Pretendard', 'Apple SD Gothic Neo', sans-serif; font-size: 14px; }

.wrap { max-width: 100%; padding: 10px 0 60px; }

/* ── 상단 헤더 ── */
.top { margin-bottom: 20px; }
.brand { display: flex; align-items: center; gap: 14px; }
.logo {
  width: 48px; height: 48px;
  background: linear-gradient(135deg, #0d9488, #0891b2);
  border-radius: 13px; display: flex; align-items: center; justify-content: center;
  font-size: 22px; flex-shrink: 0;
}
h1 { font-size: 22px; font-weight: 700; }
.sub { font-size: 13px; color: var(--muted); margin-top: 2px; }

/* ── 카드 ── */
.card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; margin-bottom: 16px; box-shadow: var(--shadow); }
.card-title { font-size: 15px; font-weight: 600; margin-bottom: 14px; display: flex; align-items: center; gap: 6px; }

/* ── 모드 탭 ── */
.mode-tabs { display: flex; gap: 6px; flex-wrap: wrap; margin-bottom: 16px; }
.mode-btn {
  padding: 6px 14px; border-radius: 20px; border: 1.5px solid var(--border);
  background: transparent; cursor: pointer; font-size: 13px; color: var(--muted);
  transition: all .15s;
}
.mode-btn.active {
  background: var(--teal); border-color: var(--teal); color: #fff; font-weight: 600;
}
.mode-btn:hover:not(.active) { border-color: var(--teal); color: var(--teal); }

/* ── 입력 영역 ── */
.input-section { display: none; }
.input-section.active { display: block; }

label { display: block; font-size: 12px; font-weight: 600; color: var(--muted); margin-bottom: 5px; text-transform: uppercase; letter-spacing: .04em; }

input[type="text"], input[type="url"], textarea, select {
  width: 100%; padding: 9px 12px; border: 1.5px solid var(--border); border-radius: 9px;
  font-size: 14px; font-family: inherit; background: #fff; color: var(--text);
  transition: border-color .15s; outline: none; resize: none;
}
input[type="text"]:focus, input[type="url"]:focus, textarea:focus, select:focus {
  border-color: var(--teal);
}

.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }
.form-group { margin-bottom: 12px; }
.form-group:last-of-type { margin-bottom: 0; }

/* ── QR 옵션 ── */
.qr-options { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 10px; margin-top: 14px; padding-top: 14px; border-top: 1px solid var(--border); }
.option-group label { margin-bottom: 5px; }
.color-pair { display: flex; gap: 8px; align-items: center; }
.color-pair input[type="color"] {
  width: 36px; height: 36px; padding: 2px; border: 1.5px solid var(--border);
  border-radius: 8px; cursor: pointer; background: #fff;
}
.size-select { padding: 8px 10px; }

/* ── 버튼 ── */
.btn-gen {
  width: 100%; padding: 13px; background: var(--teal); color: #fff;
  border: none; border-radius: 10px; font-size: 16px; font-weight: 700;
  cursor: pointer; margin-top: 16px; transition: background .15s;
}
.btn-gen:hover { background: var(--teal2); }

/* ── 결과 영역 ── */
.result-area {
  display: none; text-align: center; padding: 20px;
  background: #f0fdf9; border-radius: 12px; margin-top: 16px;
  border: 1px solid #99f6e4;
}
.result-area.show { display: block; }

#qrCanvas { border-radius: 8px; }

.dl-row { display: flex; gap: 8px; justify-content: center; margin-top: 14px; flex-wrap: wrap; }
.btn-dl {
  padding: 9px 20px; border-radius: 8px; border: none; cursor: pointer;
  font-size: 13px; font-weight: 600; transition: opacity .15s;
}
.btn-dl:hover { opacity: .85; }
.btn-dl.png { background: var(--teal); color: #fff; }
.btn-dl.svg { background: #0891b2; color: #fff; }
.btn-dl.copy { background: #f1f5f9; color: var(--text); border: 1px solid var(--border); }

.qr-info { font-size: 12px; color: var(--muted); margin-top: 10px; }

/* ── 안내 섹션 ── */
.guide-section { margin-top: 24px; padding: 22px; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow); }
.guide-section h2 { font-size: 15px; font-weight: 700; margin: 18px 0 8px; }
.guide-section h2:first-child { margin-top: 0; }
.guide-steps { padding-left: 18px; }
.guide-steps li { margin-bottom: 6px; line-height: 1.6; color: var(--muted); }
.guide-features, .guide-usecase { list-style: none; padding: 0; }
.guide-features li, .guide-usecase li { padding: 4px 0 4px 16px; position: relative; color: var(--muted); line-height: 1.6; }
.guide-features li::before { content: '•'; position: absolute; left: 0; color: var(--teal); font-weight: 700; }
.guide-usecase li::before { content: '✓'; position: absolute; left: 0; color: var(--teal); font-weight: 700; }
.guide-privacy { margin-top: 14px; padding: 12px 14px; background: var(--teal-light); border-radius: 8px; font-size: 12px; color: var(--muted); line-height: 1.6; }

@media (max-width: 480px) {
  .form-row { grid-template-columns: 1fr; }
  .qr-options { grid-template-columns: 1fr 1fr; }
}