/* Root Variables */
:root {
  --primary: #005bbb;
  --secondary: #fbbc05;
  --dark: #101820;
  --light: #f4f6f8;
  --text: #222;
  --bg: #ffffff;
  --radius: 8px;
}

/* Base Reset */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', sans-serif;
  font-size: 16px;
  color: var(--text);
  background-color: var(--light);
  line-height: 1.6;
}

h1 { font-size: 1.8rem; }
h2 { font-size: 1.6rem; }
h3 { font-size: 1.4rem; }

.sub-title{ font-size: 1.4rem; }

.container {
  max-width: 1200px;
  margin: auto;
  padding: 1rem;
}

#container_1{width:980px;margin:0px auto;padding-left:10px;background:#F8FAFA}
.print_s2{padding:10px 10px 10px 10px;FONT-WEIGHT:normal;line-height:150%;width:570px;background:#fff}
#container_0{width:990px;margin:0px auto;padding-left:0px;background:#fff}
#container_2{width:970px;margin:0px auto;padding-left:20px;background:#fff}
.b12b  {color:rgb(71,112,178);font-size:12px;;text-decoration:none;FONT-WEIGHT:bold}
a.b_box_1b {BORDER-left:#E0DFDF 1px solid;BORDER-top:#E0DFDF 1px solid;BORDER-right:#CBCACA 2px solid;BORDER-bottom:#CBCACA 2px solid;BACKGROUND-COLOR:#F9F7F7;margin:0px 0px 0px 0px;padding:5px 8px 5px 8px;text-decoration:none;color:rgb(71,112,178);font-size:12px;FONT-WEIGHT:bold}
a.b_box_1b:hover {BORDER-left:#E0DFDF 1px solid;BORDER-top:#E0DFDF 1px solid;BORDER-right:#CBCACA 2px solid;BORDER-bottom:#CBCACA 2px solid;BACKGROUND-COLOR:#F9F7F7;margin:0px 0px 0px 0px;padding:5px 8px 5px 8px;text-decoration:none;color:rgb(71,112,178);font-size:12px;FONT-WEIGHT:bold}
a.b_box_1b:visited {BORDER-left:#E0DFDF 1px solid;BORDER-top:#E0DFDF 1px solid;BORDER-right:#CBCACA 2px solid;BORDER-bottom:#CBCACA 2px solid;BACKGROUND-COLOR:#F9F7F7;margin:0px 0px 0px 0px;padding:5px 8px 5px 8px;text-decoration:none;color:rgb(71,112,178);font-size:12px;FONT-WEIGHT:bold}

/* Header */
header {
  background: var(--dark);
  color: white;
  padding: 1rem;
  position: relative;
}

.site-logo {
  font-size: 1.8rem;
  font-weight: bold;
  text-decoration: none;
  color: var(--secondary);
}

.menu-toggle {
  display: none;
  font-size: 2rem;
  position: absolute;
  top: 1rem;
  right: 1.5rem;
  cursor: pointer;
  color: #ccc;
}

.main-menu {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  background: linear-gradient(90deg, #2b2b2b, #444);
  padding: 0.5rem 0;
}

.main-menu a {
  color: #ddd;
  text-decoration: none;
  padding: 0.6rem 1rem;
  margin: 0.3rem;
  border-radius: var(--radius);
  transition: background 0.3s, color 0.3s;
  font-weight: 500;
}

.main-menu a:hover {
  background-color: rgba(255, 255, 255, 0.1);
  color: #fff;
}

/* Hero Section */
.hero-section {
  background-color: var(--bg);
  padding: 3rem 1rem;
  text-align: center;
}

.hero-section h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
}

.hero-section p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* Button */
.btn {
  display: inline-block;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius);
  text-decoration: none;
  font-weight: bold;
  transition: background 0.3s;
}

.btn.primary {
  background: var(--primary);
  color: white;
}

.btn.primary:hover {
  background: #004799;
}

.btn.secondary {
  background: var(--secondary);
  color: #000;
}

.btn.secondary:hover {
  background: #e0aa00;
}

/* Levels Grid */
.grid-levels,
.level-grid {
  text-align: center;
  margin: 3rem auto;
  max-width: 1000px;
}

.grid-levels .grid,
.level-grid .grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  padding: 1rem 0;
}

.grid-levels a,
.level-card {
  background: linear-gradient(145deg, #ffffff, #f0f0f0);
  border: 1px solid #ccc;
  border-radius: 12px;
  padding: 1.2rem 0.8rem;
  text-align: center;
  text-decoration: none;
  color: #2a2a2a;
  font-weight: 700;
  font-size: 1.05rem;
  box-shadow: 0 3px 8px rgba(0, 0, 0, 0.05);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s;
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 90px;
}

.grid-levels a span,
.level-card span {
  display: block;
  font-size: 0.95rem;
  color: #555;
  margin-top: 0.4rem;
  font-weight: 500;
}

.grid-levels a:hover,
.level-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  background: linear-gradient(145deg, #f5faff, #eaf3ff);
  color: #005bbb;
}

.puzzle-link {
  text-decoration: none;
  font-weight: bold;
  color: #005bbb;
  transition: color 0.2s;
}
.puzzle-link:hover {
  text-decoration: underline;
  color: #003e80;
}

.puzzle-link .hint-text {
  font-weight: normal;
  font-size: 0.85rem;
  color: #666;
  margin-left: 4px;
}



/* FAQ Section */
.faq {
  margin: 3rem auto;
  max-width: 800px;
}

.faq h2 {
  margin-bottom: 1rem;
  text-align: center;
}

.faq dl {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  padding: 1.5rem;
}

.faq dt {
  font-weight: bold;
  margin-top: 1rem;
}

.faq dd {
  margin-left: 0;
  margin-bottom: 1rem;
  color: #555;
}

/* Features Section */
.features {
  background: var(--light);
  padding: 2rem 1rem;
  text-align: center;
  max-width: 800px;
  margin: 0 auto;
}

.features h2 {
  margin-bottom: 1rem;
}

.features dl {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: left;
}

.features dt {
  font-weight: bold;
  margin-top: 1rem;
}

.features dd {
  margin-left: 0;
  margin-bottom: 1rem;
  color: #555;
  position: relative;
  padding-left: 1.5rem;
}

.features dd::before {
  content: '✔';
  position: absolute;
  left: 0;
  color: var(--primary);
}

/* AdSense */
.adsense-block {
  margin: 2rem 0;
  text-align: center;
}

.adsense-pc {
  height: 250px;  
  margin: 20px 0;
  text-align: center;
}


/* Footer */
footer {
  background: var(--dark);
  color: white;
  text-align: center;
  padding: 2rem 1rem;
  font-size: 14px;
}

.footer-links,
.footer-languages {
  margin: 0.5rem 0;
  margin-bottom: 1rem;  
}

.footer-links a,
.footer-languages a {
  color: #bbb;
  margin: 0 0.75rem;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover,
.footer-languages a:hover {
  color: #fff;
}


.completion-time {
  font-size: 2.5rem;
  margin: 1.5rem 0;
  color: var(--primary);
  text-align: center;
}

.result-actions {
  text-align: center;
  margin: 2rem 0;
}

.result-actions .btn {
  margin: 0.5rem;
}


.page-intro {
  font-size: 1.125rem; 
  color: #555; 
  line-height: 1.6; 
  margin: 20px 0; 
  padding: 12px 20px; 
  background-color: #f7f9fc; 
  border-left: 4px solid #007BFF; 
  border-radius: 6px; 
}

.difficulty-group {
  border: 1px solid #ccc;
  border-left: 5px solid var(--primary);
  background: #fff;
  padding: 1rem 1.5rem;
  margin: 2rem 0;
  border-radius: var(--radius);
  box-shadow: 0 2px 6px rgba(0,0,0,0.05);
}

.difficulty-group h3 {
  margin-bottom: 0.5rem;
  color: var(--primary);
  font-size: 1.5rem;
}

.difficulty-desc {
  margin-top: 0.5rem;
  color: #555;
  font-size: 0.95rem;
}



/* new sudoku game */

.sudoku-layout {
  display: flex;
  flex-direction: row;
  justify-content: center;
  gap: 30px;
  padding: 10px;
}

.sudoku-left {
  flex: 0 0 auto;
}

.sudoku-right {
  display: flex;
  flex-direction: column;
  align-items: center;
  max-width: 320px;
  margin-top: 64px;   
  
}

.controls {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-bottom: 12px;
}

.controls button {
  padding: 6px 10px;
  font-size: 14px;
}

.keypad {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
  width: 100%;
}

.keypad button {
  padding: 8px 0;
  font-size: 16px;
}


/*  - PC  */
.controls-below,
.keypad-below {
  margin: 10px auto 0;
  text-align: center;
  max-width: 420px;
}

/*  */
.controls-below {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 6px;
  margin-top: 10px;
}

.controls-below button {
  padding: 6px 10px;
  font-size: 14px;
}

.keypad-below {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 5px;
  margin-top: 8px;
}

.keypad-below button {
  padding: 8px 0;
  font-size: 16px;
}

/*  sudoku-right  */
.sudoku-right .controls,
.sudoku-right .keypad {
  display: none;
}

/** end **/

#game-container {
  max-width: 420px;
  margin: auto;
  padding: 10px;
}
table {
  border-collapse: collapse;
  width: 100%;
  border: 3px solid #000;
  margin-bottom: 10px;
}
td {
  border: 1px solid #999;
  padding: 0;
}

/* 클릭한 셀 (선택된 셀) */
td.selected input {
  background-color: #d0f0d0 !important;
  outline: 2px solid #66cc66;
}
.cell {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 100%;
  aspect-ratio: 1 / 1;
}
.cell input {
  width: 100%;
  height: 100%;
  font-size: 22px;
  text-align: center;
  border: none;
  box-sizing: border-box;
  background: white;
}

/* 마우스를 올렸을 때 */
.cell:hover input {
  background-color: #e0f7ff;
}

.fixed input {
  background: #eee;
  font-weight: bold;
}
.error input {
  background-color: #ffcaca;
  color: red;
  font-weight: bold;
}
td:nth-child(3),
td:nth-child(6) {
  border-right: 2px solid #000;
}
tr:nth-child(3) td,
tr:nth-child(6) td {
  border-bottom: 2px solid #000;
}


#timer {
  font-weight: bold;
  margin: 6px 0;
  font-size: 15px;
}

#timer a:hover {
  text-decoration: underline;
}


/* sudoku game end */

.print_s2{padding:10px 10px 10px 10px;FONT-WEIGHT:normal;line-height:150%;width:570px;background:#fff}

.daily-level-links {
  max-width: 960px;
  margin: 3rem auto;
  padding: 0 1rem;
  text-align: center;
}

.daily-level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.section-desc {
  font-size: 1.05rem;
  color: #444;
  margin: 0 auto 1.5rem;
  max-width: 700px;
  line-height: 1.6;
}

.date-archive {
  margin-top: 2rem;
  text-align: center;
}

.date-button-row {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.5rem;
  margin-top: 1rem;
}

.date-button {
  background: #f8f9fa;
  border: 1px solid #ccc;
  border-radius: 6px;
  padding: 8px 12px;
  font-size: 14px;
  text-decoration: none;
  color: var(--primary);
  transition: background 0.3s, color 0.3s;
}

.date-button:hover {
  background: var(--primary);
  color: #fff;
}
.today-ranking-section {text-align:center;}
.today-ranking-section table {width:80%;margin: 0 auto;}
.today-ranking-section th,
.today-ranking-section td {
  padding: 12px 12px;
}
.today-ranking-section h3 {
  margin-bottom: 20px;
}

  .ranking-container { max-width: 900px; margin: 0 auto; padding: 20px; background: #fff; }
  .ranking-block { margin-bottom: 40px; }
  .ranking-block h2 { font-size: 20px; margin-bottom: 10px; border-bottom: 1px solid #ccc; padding-bottom: 5px; }
  .ranking-table { width: 100%; border-collapse: collapse; margin-top: 10px; }
  .ranking-table th, .ranking-table td { border: 1px solid #ddd; padding: 8px; text-align: center; }
  .ranking-table th { background-color: #f9f9f9; }
  .faq-section { margin-top: 60px; padding-top: 30px; border-top: 1px solid #ccc; }
  .faq-section h2 { font-size: 20px; margin-bottom: 15px; }
  .faq-section dt { font-weight: bold; margin-top: 15px; }
  .faq-section dd { margin-left: 0; margin-bottom: 10px; }

.view-all-ranking {
  text-align: right;
  margin-top: 10px;
}

.view-all-ranking .btn.secondary {
  padding: 6px 14px;
  background-color: #f0f0f0;
  border: 1px solid #ccc;
  border-radius: 4px;
  text-decoration: none;
  font-size: 14px;
  color: #333;
}

.view-all-ranking .btn.secondary:hover {
  background-color: #e0e0e0;
  border-color: #999;
}


.book-page {
  max-width: 1000px;
  margin: 0 auto;
  padding: 20px;
}

.book-page h2 {
  margin-top: 40px;
  font-size: 1.4rem;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}
.book-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin-top: 1rem;
}
.book-card {
  background: #fff;
  border: 1px solid #ddd;
  border-radius: 12px;
  padding: 1rem;
  text-align: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.05);
  transition: transform 0.2s;
}
.book-card:hover { transform: translateY(-5px); }
.book-card img {
  max-width: 100%;
  height: auto;
  object-fit: cover;
  margin-bottom: 0.75rem;
}
.book-card h3 {
  font-size: 1.1rem;
  margin: 0.5rem 0;
  color: #222;
}
.book-card a {
  text-decoration: none;
  color: inherit;
}
.book-card p {
  font-size: 0.9rem;
  color: #555;
  line-height: 1.4;
}

.book-detail {
  max-width: 960px;
  margin: 0 auto;
  padding: 20px;
  line-height: 1.6;
}
.book-cover {
  max-width: 300px;
  float: right;
  margin: 0 0 1rem 2rem;
  border: 1px solid #ccc;
  border-radius: 8px;
}
.book-desc {
  font-size: 1rem;
  color: #333;
  margin-bottom: 1.5rem;
}
.book-meta h2 {
  font-size: 1.3rem;
  margin-top: 2rem;
  color: #222;
}
.buy-button {
  display: inline-block;
  background: #0066c0;
  color: white;
  padding: 0.6rem 1rem;
  border-radius: 5px;
  text-decoration: none;
  margin-top: 1rem;
}
.buy-button:hover {
  background: #004080;
}

/*--*/

.guide-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  font-size: 1rem;
  line-height: 1.7;
  color: #333;
  position: relative;
}
.guide-page h2 {
  font-size: 1.25rem;
  margin-top: 2rem;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}
.guide-page ul li {
  margin-bottom: 0.5rem;
}
.guide-faq dt {
  font-weight: bold;
  margin-top: 1rem;
}
.guide-faq dd {
  margin-left: 0;
  margin-bottom: 1rem;
}
.guide-sidebar {
  background: #f9f9f9;
  border: 1px solid #ddd;
  padding: 1rem;
  border-radius: 8px;
  margin: 1rem 0;
}
.guide-sidebar h3 {
  font-size: 1.1rem;
  margin-bottom: 0.5rem;
}
.guide-sidebar ul {
  padding-left: 1.2rem;
  line-height: 1.5;
}
.book-links {
  padding-left: 1.2rem;
}
.book-links li {
  margin-bottom: 0.5rem;
}
.book-links a {
  text-decoration: none;
  color: #0066cc;
}
.book-links a:hover {
  text-decoration: underline;
}

/**/
.guide-page {
  max-width: 900px;
  margin: 0 auto;
  padding: 20px;
  font-size: 1rem;
  line-height: 1.7;
  color: #333;
}
.guide-page h2 {
  margin-top: 2rem;
  font-size: 1.25rem;
  border-bottom: 2px solid #ccc;
  padding-bottom: 5px;
}
.guide-page ul {
  padding-left: 1.2rem;
}
.guide-page ul li {
  margin-bottom: 0.5rem;
}
.guide-page a {
  color: #0066cc;
  text-decoration: none;
}
.guide-page a:hover {
  text-decoration: underline;
}

/*--*/

.breadcrumb {
  font-size: 0.95rem;
  margin: 10px 0 20px;
  color: #666;
}
.breadcrumb a {
  color: #007acc;
  text-decoration: none;
}
.breadcrumb a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
	
  table {
    margin-bottom: 0px; /* 퍼즐 하단과 버튼 사이 최소 간격 */
  }	
	
/** game **/	
  .sudoku-layout {
    flex-direction: column;
    align-items: center;
  }

  .sudoku-right {
    width: 100%;
	margin-top: 0px;
  }

  .adsense-pc {
    display: none;
  }

   .controls {
    margin-top: 0px;     /* 기존보다 간격 축소 */
    margin-bottom: 6px;  /* 하단 여백도 최소화 */
    gap: 4px;            /* 버튼 사이 간격 축소 */
  }
 
  .controls button {
    padding: 5px 12px;   /* 버튼 높이도 약간 축소 */
    font-size: 13px;
	margin-top: 0px;
  }

  .keypad {
    margin-top: 4px;     /* 퍼즐~키패드 간격도 축소 */
    gap: 4px;
  }

  .keypad button {
    padding: 6px 0;
    font-size: 14px;
  }
  
 /** game end **/	

  #game-container {
    max-width: 320px;
    padding: 5px;
  }
  .cell input {
    font-size: 14px;
  }
 
  #timer {
    font-size: 13px;
  }
  
  .menu-toggle {
    display: block;
  }

  .main-menu {
    display: none;
    flex-direction: column;
    background-color: var(--dark);
  }

  .main-menu.show {
    display: flex;
  }

  .main-menu a {
    width: 100%;
    padding: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }
}