/* =========================================================
   LINE OA Mastery — Learning Curriculum Stylesheet
   ========================================================= */

:root {
  --primary: #06c755;
  --primary-dark: #05a848;
  --primary-light: #e8f8ef;
  --accent: #00b900;
  --gray-50: #f9fafb;
  --gray-100: #f3f4f6;
  --gray-200: #e5e7eb;
  --gray-300: #d1d5db;
  --gray-500: #6b7280;
  --gray-700: #374151;
  --gray-800: #1f2937;
  --gray-900: #111827;
  --red: #ef4444;
  --amber: #f59e0b;
  --blue: #3b82f6;
  --radius: 8px;
  --shadow: 0 1px 3px rgba(0,0,0,0.1), 0 1px 2px rgba(0,0,0,0.06);
  --shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans Thai", "Helvetica Neue", sans-serif;
  color: var(--gray-800);
  background: var(--gray-50);
  line-height: 1.7;
  font-size: 16px;
}

/* ---- Layout ---- */
.container {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ---- Header / Nav ---- */
.top-bar {
  background: var(--primary);
  color: white;
  padding: 12px 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.top-bar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.top-bar a {
  color: white;
  text-decoration: none;
}
.top-bar .logo {
  font-weight: 700;
  font-size: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.top-bar .logo img.emoji {
  width: 24px;
  height: 24px;
}
.page-nav {
  display: flex;
  gap: 16px;
}
.page-nav a {
  font-size: 13px;
  opacity: 0.85;
  transition: opacity 0.2s;
}
.page-nav a:hover { opacity: 1; text-decoration: underline; }

/* ---- Hero block (main page) ---- */
.hero {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
  color: white;
  padding: 60px 0 50px;
  text-align: center;
}
.hero h1 {
  font-size: 38px;
  font-weight: 800;
  margin-bottom: 12px;
}
.hero p {
  font-size: 18px;
  opacity: 0.9;
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.6;
}

/* ---- Module Card Grid (index) ---- */
.module-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
  padding: 40px 0;
}
.module-card {
  background: white;
  border: 1px solid var(--gray-200);
  border-radius: var(--radius);
  padding: 24px;
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: default;
}
.module-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}
.module-card .num {
  display: inline-block;
  background: var(--primary);
  color: white;
  font-size: 12px;
  font-weight: 700;
  padding: 3px 10px;
  border-radius: 12px;
  margin-bottom: 10px;
}
.module-card h3 {
  font-size: 17px;
  margin-bottom: 8px;
}
.module-card p {
  font-size: 14px;
  color: var(--gray-500);
  line-height: 1.5;
}
.module-card a {
  text-decoration: none;
  color: inherit;
  display: block;
}

/* ---- Article shell (module pages) ---- */
article.module {
  padding: 40px 0 60px;
}
article.module header {
  margin-bottom: 32px;
}
article.module header h1 {
  font-size: 30px;
  color: var(--gray-900);
  margin-bottom: 6px;
}
article.module header .subtitle {
  font-size: 16px;
  color: var(--gray-500);
}
.meta-bar {
  display: flex;
  gap: 16px;
  margin-top: 12px;
  font-size: 13px;
  color: var(--gray-500);
}
.meta-bar span { display: flex; align-items: center; gap: 4px; }

/* ---- Section headings ---- */
section { margin-bottom: 36px; }
section h2 {
  font-size: 22px;
  color: var(--gray-900);
  border-bottom: 3px solid var(--primary);
  padding-bottom: 6px;
  margin-bottom: 16px;
}
section h3 {
  font-size: 18px;
  color: var(--gray-800);
  margin-top: 20px;
  margin-bottom: 10px;
}
section h4 {
  font-size: 16px;
  color: var(--gray-700);
  margin-top: 14px;
  margin-bottom: 6px;
}
section p {
  margin-bottom: 12px;
}
section ul, section ol {
  margin: 8px 0 14px 20px;
}
section li {
  margin-bottom: 5px;
}
section a {
  color: var(--primary-dark);
  text-decoration: underline;
}
section a:hover { color: var(--primary); }

/* ---- Code blocks ---- */
pre {
  background: var(--gray-900);
  color: #e2e8f0;
  border-radius: var(--radius);
  padding: 16px 18px;
  overflow-x: auto;
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 13px;
  line-height: 1.6;
  margin: 12px 0 18px;
  tab-size: 2;
}
code {
  font-family: "SF Mono", "Fira Code", "Consolas", monospace;
  font-size: 0.9em;
  padding: 2px 5px;
  border-radius: 4px;
}
p code, li code {
  background: var(--gray-100);
  color: var(--gray-800);
}
pre code {
  background: none;
  padding: 0;
  color: inherit;
}
code .comment { color: #6b7280; };
code .string { color: #86e1fc; }
code .keyword { color: #c792ea; }
code .number { color: #f78c6c; }
code .function { color: #82aaff; }

/* ---- Callout boxes ---- */
.callout {
  padding: 16px 18px;
  border-radius: var(--radius);
  margin: 18px 0;
  border-left: 4px solid;
  font-size: 14px;
}
.callout.tip {
  background: var(--primary-light);
  border-color: var(--primary);
}
.callout.info {
  background: #eff6ff;
  border-color: var(--blue);
}
.callout.warn {
  background: #fffbeb;
  border-color: var(--amber);
}
.callout.thai {
  background: #fef2f2;
  border-color: var(--red);
}
.callout strong { font-weight: 700; }
.callout .label {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 4px;
}

/* ---- Tables ---- */
.table-wrap {
  overflow-x: auto;
  margin: 12px 0 18px;
}
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
}
thead {
  background: var(--gray-800);
  color: white;
}
th, td {
  padding: 10px 14px;
  text-align: left;
  border: 1px solid var(--gray-200);
}
tbody tr:nth-child(even) { background: var(--gray-50); }
tbody tr:hover { background: var(--primary-light); }

/* ---- Keyboard shortcut tags ---- */
kbd {
  background: var(--gray-200);
  border: 1px solid var(--gray-300);
  border-radius: 4px;
  padding: 2px 6px;
  font-size: 12px;
  font-family: inherit;
}

/* ---- Bottom navigation ---- */
.module-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 48px;
  padding-top: 24px;
  border-top: 2px solid var(--gray-200);
}
.module-nav a {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 14px;
  text-decoration: none;
  transition: background 0.2s;
}
.module-nav .prev {
  background: var(--gray-100);
  color: var(--gray-700);
}
.module-nav .prev:hover { background: var(--gray-200); }
.module-nav .next {
  background: var(--primary);
  color: white;
}
.module-nav .next:hover { background: var(--primary-dark); }

/* ---- Footer ---- */
.site-footer {
  background: var(--gray-900);
  color: var(--gray-500);
  padding: 28px 0;
  font-size: 13px;
  text-align: center;
}
.site-footer a { color: var(--primary); text-decoration: none; }

/* ---- Responsive ---- */
@media (max-width: 640px) {
  .hero h1 { font-size: 26px; }
  .module-grid { grid-template-columns: 1fr; }
  article.module header h1 { font-size: 24px; }
  .top-bar .logo { font-size: 15px; }
  pre { font-size: 12px; padding: 12px; }
}