/* ============================================================
   BASE STYLES — Rau Sạch Miền Nam
   Mobile-first (375px baseline), breakpoint 768px cho desktop
   Bảng màu xanh lá nông nghiệp
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --green-900: #1B5E20;
  --green-700: #2D7D46;
  --green-600: #388E3C;
  --green-500: #4CAF50;
  --green-300: #81C784;
  --green-100: #C8E6C9;
  --green-50:  #E8F5E9;
  --brown-600: #6D4C41;
  --brown-400: #8D6E63;
  --brown-100: #EFEBE9;
  --yellow-600: #FFB300;
  --yellow-100: #FFF8E1;
  --red-500: #E53935;
  --blue-500: #1E88E5;
  --text-primary: #212121;
  --text-secondary: #616161;
  --text-hint: #9E9E9E;
  --bg-page: #F9FAF5;
  --bg-card: #FFFFFF;
  --border: #E0E0E0;
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 2px 8px rgba(0,0,0,0.10);
  --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Noto Sans", "Helvetica Neue", Arial, sans-serif;
}

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

html {
  font-size: 16px;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-stack);
  background: var(--bg-page);
  color: var(--text-primary);
  line-height: 1.5;
  min-height: 100vh;
}

img {
  max-width: 100%;
  display: block;
}

button {
  font: inherit;
  cursor: pointer;
  border: none;
  background: none;
}

a {
  color: inherit;
  text-decoration: none;
}

/* --- Top Nav --- */
.top-nav {
  background: var(--green-700);
  color: #fff;
  padding: 0 16px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  position: sticky;
  top: 0;
  z-index: 100;
}

.top-nav__logo {
  font-size: 1rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  gap: 8px;
}

.top-nav__logo .icon {
  font-size: 1.3rem;
}

.top-nav__menu {
  display: flex;
  gap: 4px;
}

.top-nav__link {
  color: rgba(255,255,255,0.85);
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  font-size: 0.85rem;
  font-weight: 500;
  transition: background 0.15s;
}

.top-nav__link:hover,
.top-nav__link--active {
  background: rgba(255,255,255,0.15);
  color: #fff;
}

/* --- Page Header --- */
.page-header {
  padding: 20px 16px 12px;
}

.page-header__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--green-900);
  margin-bottom: 4px;
}

.page-header__sub {
  font-size: 0.85rem;
  color: var(--text-secondary);
}

/* --- Site Footer --- */
.site-footer {
  text-align: center;
  padding: 20px 16px;
  font-size: 0.75rem;
  color: var(--text-hint);
  border-top: 1px solid var(--border);
  margin-top: 12px;
}

/* ============================================================
   BLOG STYLES
   ============================================================ */

/* --- Blog List --- */
.blog-list {
  padding: 0 16px 24px;
}

.blog-card {
  background: var(--bg-card);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
  margin-bottom: 12px;
  transition: box-shadow 0.2s, transform 0.15s;
  overflow: hidden;
}

.blog-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.blog-card__link {
  display: block;
  padding: 16px;
}

.blog-card__title {
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--green-900);
  margin-bottom: 8px;
  line-height: 1.3;
}

.blog-card__meta {
  display: flex;
  gap: 12px;
  font-size: 0.78rem;
  color: var(--text-hint);
  margin-bottom: 8px;
}

.blog-card__excerpt {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.blog-card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.blog-card__tag {
  font-size: 0.68rem;
  padding: 2px 10px;
  border-radius: 12px;
  background: var(--green-50);
  color: var(--green-700);
  font-weight: 500;
}

/* Blog Empty State */
.blog-empty {
  text-align: center;
  padding: 48px 16px;
  color: var(--text-hint);
  font-size: 1rem;
}

/* --- Blog Post --- */
.blog-post {
  padding: 0 16px 24px;
}

.blog-post__header {
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 2px solid var(--green-100);
}

.blog-post__title {
  font-size: 1.35rem;
  font-weight: 700;
  color: var(--green-900);
  margin-bottom: 10px;
  line-height: 1.3;
}

.blog-post__meta {
  display: flex;
  gap: 14px;
  font-size: 0.82rem;
  color: var(--text-hint);
  margin-bottom: 10px;
}

.blog-post__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.blog-post__tag {
  font-size: 0.7rem;
  padding: 3px 12px;
  border-radius: 14px;
  background: var(--green-50);
  color: var(--green-700);
  font-weight: 500;
}

/* Blog Post Body — Markdown rendered content */
.blog-post__body {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--text-primary);
}

.blog-post__body h2 {
  font-family: var(--font-stack);
  font-size: 1.2rem;
  color: var(--green-900);
  margin: 24px 0 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--green-100);
}

.blog-post__body h3 {
  font-family: var(--font-stack);
  font-size: 1.05rem;
  color: var(--green-700);
  margin: 20px 0 8px;
}

.blog-post__body p {
  margin-bottom: 14px;
}

.blog-post__body ul,
.blog-post__body ol {
  margin: 0 0 14px 20px;
  padding: 0;
}

.blog-post__body li {
  margin-bottom: 6px;
}

.blog-post__body strong {
  color: var(--green-900);
}

.blog-post__body blockquote {
  margin: 16px 0;
  padding: 12px 16px;
  border-left: 4px solid var(--green-500);
  background: var(--green-50);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-style: italic;
  color: var(--text-secondary);
}

.blog-post__body table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0;
  font-size: 0.88rem;
  font-family: var(--font-stack);
}

.blog-post__body th,
.blog-post__body td {
  padding: 8px 10px;
  border: 1px solid var(--border);
  text-align: left;
}

.blog-post__body th {
  background: var(--green-50);
  color: var(--green-900);
  font-weight: 600;
}

.blog-post__body code {
  background: var(--green-50);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: 0.9em;
  font-family: "SF Mono", "Consolas", monospace;
}

.blog-post__body pre {
  background: #263238;
  color: #e0e0e0;
  padding: 14px;
  border-radius: var(--radius-sm);
  overflow-x: auto;
  margin: 14px 0;
  font-size: 0.85rem;
}

.blog-post__body pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.blog-post__body img {
  border-radius: var(--radius-sm);
  margin: 12px 0;
}

.blog-post__body hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}

.blog-post__body a {
  color: var(--green-600);
  text-decoration: underline;
}

/* Blog Post Footer */
.blog-post__footer {
  margin-top: 32px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.blog-post__back {
  display: inline-block;
  color: var(--green-600);
  font-weight: 600;
  font-size: 0.9rem;
  transition: color 0.15s;
}

.blog-post__back:hover {
  color: var(--green-800);
}

/* Blog 404 */
.blog-404 {
  text-align: center;
  padding: 48px 16px;
}

.blog-404 h2 {
  font-size: 1.3rem;
  color: var(--text-primary);
  margin-bottom: 10px;
}

.blog-404 p {
  color: var(--text-secondary);
  margin-bottom: 20px;
}

.blog-404__back {
  display: inline-block;
  color: var(--green-600);
  font-weight: 600;
}

/* --- Responsive: Desktop (>=768px) --- */
@media (min-width: 768px) {
  .top-nav {
    padding: 0 32px;
  }

  .page-header {
    padding: 28px 32px 16px;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
  }

  .page-header__title {
    font-size: 1.6rem;
  }
}