/* classictools 공통 스타일 - 가독성·깔끔함 개선 */
@import url('https://fonts.googleapis.com/css2?family=Noto+Sans+KR:wght@400;500;600;700&display=swap');

:root {
  --ct-primary: #4f46e5;
  --ct-primary-hover: #4338ca;
  --ct-primary-light: #eef2ff;
  --ct-bg: #f8fafc;
  --ct-bg-warm: #fafbfc;
  --ct-card: #ffffff;
  --ct-text: #1e293b;
  --ct-text-secondary: #475569;
  --ct-text-muted: #64748b;
  --ct-border: #e2e8f0;
  --ct-border-light: #f1f5f9;
  --ct-radius: 10px;
  --ct-radius-sm: 8px;
  --ct-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --ct-shadow-card: 0 2px 8px rgba(0, 0, 0, 0.04);
  --ct-transition: 0.18s ease;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--ct-bg);
  color: var(--ct-text);
  line-height: 1.65;
  font-size: 15px;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--ct-primary); text-decoration: none; }
a:hover { text-decoration: underline; }

/* ===== 헤더 ===== */
.ct-header {
  background: var(--ct-card);
  border-bottom: 1px solid var(--ct-border-light);
  padding: 1rem 1.5rem;
  box-shadow: var(--ct-shadow);
}

.ct-header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0.875rem;
}

.ct-header h1 {
  margin: 0;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.ct-logo a {
  color: var(--ct-text);
  text-decoration: none;
  transition: color var(--ct-transition);
}

.ct-logo a:hover {
  color: var(--ct-primary);
  text-decoration: none;
}

.ct-search-wrap { position: relative; }

.ct-search-input {
  width: 100%;
  max-width: 340px;
  padding: 0.5rem 0.875rem 0.5rem 2.5rem;
  border: 1px solid var(--ct-border);
  border-radius: var(--ct-radius);
  font-size: 0.9rem;
  font-family: inherit;
  background: var(--ct-bg) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2364748b' stroke-width='2'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cpath d='m21 21-4.35-4.35'/%3E%3C/svg%3E") no-repeat 0.75rem center;
  transition: border-color var(--ct-transition), box-shadow var(--ct-transition);
}

.ct-search-input::placeholder {
  color: var(--ct-text-muted);
}

.ct-search-input:focus {
  outline: none;
  border-color: var(--ct-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

.ct-search-result {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  max-width: 360px;
  max-height: 300px;
  overflow-y: auto;
  background: var(--ct-card);
  border: 1px solid var(--ct-border);
  border-radius: var(--ct-radius);
  box-shadow: var(--ct-shadow-card);
  z-index: 100;
  margin-top: 4px;
}

.ct-search-result.ct-open { display: block; }

.ct-search-item {
  display: block;
  padding: 0.6rem 0.875rem;
  color: var(--ct-text);
  font-size: 0.9rem;
  border-bottom: 1px solid var(--ct-border-light);
  transition: background var(--ct-transition);
}

.ct-search-item:last-child { border-bottom: none; }

.ct-search-item:hover {
  background: var(--ct-primary-light);
  color: var(--ct-primary);
  text-decoration: none;
}

.ct-search-empty {
  padding: 1rem;
  color: var(--ct-text-muted);
  font-size: 0.875rem;
}

.ct-nav {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  flex-wrap: wrap;
}

.ct-nav a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--ct-radius-sm);
  background: var(--ct-bg);
  color: var(--ct-text-secondary);
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background var(--ct-transition), color var(--ct-transition);
}

.ct-nav a:hover {
  background: var(--ct-border);
  color: var(--ct-text);
  text-decoration: none;
}

.ct-nav a.ct-home {
  background: var(--ct-primary);
  color: #fff;
}

.ct-nav a.ct-home:hover {
  background: var(--ct-primary-hover);
  text-decoration: none;
}

/* ===== 메인 ===== */
.ct-main {
  max-width: 880px;
  margin: 0 auto;
  padding: 1.75rem 1.5rem;
}

.ct-intro {
  color: var(--ct-text-muted);
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-bottom: 1.75rem;
}

/* ===== 카드 ===== */
.ct-card {
  background: var(--ct-card);
  border-radius: var(--ct-radius);
  box-shadow: var(--ct-shadow-card);
  padding: 1.5rem;
  margin-bottom: 1.25rem;
  border: 1px solid var(--ct-border-light);
}

.ct-card h2 {
  margin: 0 0 0.5rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--ct-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.ct-card h2 + p {
  margin: 0 0 1rem;
  font-size: 0.9rem;
  color: var(--ct-text-muted);
  line-height: 1.5;
}

/* ===== 툴 그리드 ===== */
.ct-tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
  gap: 0.5rem;
}

.ct-tool-link {
  display: block;
  padding: 0.7rem 0.9rem;
  border-radius: var(--ct-radius-sm);
  background: var(--ct-bg);
  color: var(--ct-text);
  font-size: 0.9rem;
  font-weight: 500;
  transition: background var(--ct-transition), color var(--ct-transition), transform var(--ct-transition);
}

.ct-tool-link:hover {
  background: var(--ct-primary-light);
  color: var(--ct-primary);
  text-decoration: none;
  transform: translateY(-1px);
}

.ct-tool-link[style*="background:#e0e7ff"] {
  background: var(--ct-primary-light) !important;
  color: var(--ct-primary);
  font-weight: 600;
}

/* ===== 툴 페이지 ===== */
.ct-tool-page .ct-tool-title {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.35rem;
  letter-spacing: -0.02em;
  color: var(--ct-text);
}

.ct-tool-page .ct-tool-desc {
  color: var(--ct-text-muted);
  font-size: 0.9375rem;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

/* ===== AI 툴 링크 블록 ===== */
.ct-tool-links {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--ct-border-light);
}

.ct-tool-links-title {
  font-size: 0.8125rem;
  font-weight: 600;
  color: var(--ct-text-secondary);
  margin-bottom: 0.5rem;
}

.ct-tool-links-cats {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.75rem;
}

.ct-tool-links-cats a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  background: var(--ct-primary-light);
  color: var(--ct-primary);
  border-radius: 6px;
  font-size: 0.8125rem;
  font-weight: 500;
  transition: background var(--ct-transition), color var(--ct-transition);
}

.ct-tool-links-cats a:hover {
  background: #c7d2fe;
  color: var(--ct-primary-hover);
  text-decoration: none;
}

.ct-tool-links-recs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.ct-tool-links-recs a {
  display: inline-block;
  padding: 0.35rem 0.65rem;
  background: var(--ct-bg);
  color: var(--ct-text-secondary);
  border: 1px solid var(--ct-border);
  border-radius: 6px;
  font-size: 0.8125rem;
  transition: border-color var(--ct-transition), color var(--ct-transition);
}

.ct-tool-links-recs a:hover {
  border-color: var(--ct-primary);
  color: var(--ct-primary);
  text-decoration: none;
}

/* ===== 폼 ===== */
.ct-form-group {
  margin-bottom: 1.125rem;
}

.ct-form-group label {
  display: block;
  font-size: 0.875rem;
  font-weight: 600;
  margin-bottom: 0.4rem;
  color: var(--ct-text-secondary);
}

.ct-form-group textarea,
.ct-form-group input,
.ct-form-group select {
  width: 100%;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--ct-border);
  border-radius: var(--ct-radius-sm);
  font-size: 0.9375rem;
  font-family: inherit;
  background: var(--ct-card);
  transition: border-color var(--ct-transition), box-shadow var(--ct-transition);
}

.ct-form-group textarea {
  min-height: 130px;
  resize: vertical;
  line-height: 1.6;
}

.ct-form-group input:focus,
.ct-form-group textarea:focus,
.ct-form-group select:focus {
  outline: none;
  border-color: var(--ct-primary);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.12);
}

/* ===== 버튼 ===== */
.ct-btn {
  padding: 0.6rem 1.15rem;
  border: none;
  border-radius: var(--ct-radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  background: var(--ct-primary);
  color: #fff;
  font-family: inherit;
  transition: background var(--ct-transition), transform 0.1s ease;
}

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

.ct-btn:active {
  transform: scale(0.98);
}

.ct-btn-secondary {
  background: var(--ct-border);
  color: var(--ct-text);
}

.ct-btn-secondary:hover {
  background: #cbd5e1;
  color: var(--ct-text);
}

/* 툴 페이지 캔버스 */
.ct-tool-page canvas {
  max-width: 100%;
  border-radius: var(--ct-radius-sm);
  border: 1px solid var(--ct-border);
  cursor: crosshair;
}

/* ===== 결과 영역 ===== */
.ct-result {
  margin-top: 1rem;
  padding: 1.125rem 1.25rem;
  background: var(--ct-bg);
  border: 1px solid var(--ct-border-light);
  border-radius: var(--ct-radius-sm);
  font-size: 0.9375rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
  color: var(--ct-text-secondary);
}

/* ===== 사이드바 ===== */
.ct-sidebar {
  margin-bottom: 1.5rem;
}

.ct-sidebar .ct-tool-grid {
  grid-template-columns: repeat(auto-fill, minmax(165px, 1fr));
}

/* ===== 광고 영역 ===== */
.ct-ad {
  min-height: 90px;
  background: var(--ct-bg);
  border: 1px dashed var(--ct-border);
  border-radius: var(--ct-radius);
  margin: 1rem 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--ct-text-muted);
  font-size: 0.75rem;
}

.ct-ad-top { min-height: 50px; }
.ct-ad-middle { min-height: 90px; }
.ct-ad-bottom { min-height: 90px; }

/* ===== 푸터 ===== */
.ct-footer {
  text-align: center;
  padding: 1.25rem 1rem;
  color: var(--ct-text-muted);
  font-size: 0.8125rem;
  border-top: 1px solid var(--ct-border-light);
  margin-top: 1.5rem;
  background: var(--ct-card);
}

.ct-footer a {
  color: var(--ct-primary);
}

.ct-footer a:hover {
  text-decoration: underline;
}

/* ===== 반응형 ===== */
@media (max-width: 640px) {
  .ct-main {
    padding: 1.25rem 1rem;
  }

  .ct-card {
    padding: 1.25rem;
  }

  .ct-tool-grid {
    grid-template-columns: 1fr;
  }

  .ct-sidebar .ct-tool-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .ct-tool-page .ct-tool-title {
    font-size: 1.2rem;
  }
}

@media (max-width: 480px) {
  .ct-sidebar .ct-tool-grid {
    grid-template-columns: 1fr;
  }
}