/* Gạo Nâu Styling — Blog stylesheet (đồng bộ token với trang chủ) */
:root {
  --bg-color: #F7F1E8;
  --surface-color: #FFFDF8;
  --sand-color: #E7D9C4;
  --ink-dark: #2C1A12;
  --ink-soft: #3A3430;
  --accent-color: #9E4A63;
  --accent-hover: #83384F;
  --accent-light: #F0DCE2;
  --font-heading: 'Playfair Display', serif;
  --font-body: 'Be Vietnam Pro', sans-serif;
  --radius: 14px;
  --shadow: 0 12px 32px rgba(44, 26, 18, 0.05);
  --shadow-hover: 0 16px 40px rgba(44, 26, 18, 0.12);
  --transition: 200ms ease;
  --container-max: 1200px;
  --reading-max: 720px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  color: var(--ink-soft);
  background: var(--bg-color);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent-color); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--accent-hover); }

.container { max-width: var(--container-max); margin: 0 auto; padding: 0 24px; }

/* ===== Header ===== */
.header {
  position: sticky; top: 0; z-index: 50;
  background: rgba(247, 241, 232, 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid rgba(44, 26, 18, 0.07);
}
.header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { font-family: var(--font-heading); font-weight: 700; font-size: 1.3rem; color: var(--ink-dark); letter-spacing: 0.5px; }
.logo span { color: var(--accent-color); font-weight: 500; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { color: var(--ink-soft); font-weight: 500; font-size: 0.95rem; }
.nav-links a:hover { color: var(--accent-color); }
.btn {
  display: inline-block; font-family: var(--font-body); font-weight: 600; font-size: 0.95rem;
  padding: 12px 26px; border-radius: 100px; cursor: pointer; transition: all var(--transition);
  border: 1.5px solid transparent; text-align: center;
}
.btn-primary { background: var(--accent-color); color: #fff; }
.btn-primary:hover { background: var(--accent-hover); color: #fff; transform: translateY(-1px); }
.btn-outline { background: transparent; border-color: var(--ink-dark); color: var(--ink-dark); }
.btn-outline:hover { background: var(--ink-dark); color: var(--bg-color); }

/* ===== Article ===== */
.article-wrap { padding: 40px 0 80px; }
.breadcrumb { font-size: 0.86rem; color: var(--ink-soft); opacity: 0.75; margin-bottom: 28px; }
.breadcrumb a { color: var(--ink-soft); }
.breadcrumb a:hover { color: var(--accent-color); }
.breadcrumb span { margin: 0 6px; }

.article { max-width: var(--reading-max); margin: 0 auto; }
.article .eyebrow {
  display: inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--accent-color); margin-bottom: 14px;
}
.article h1 {
  font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark);
  font-size: clamp(1.9rem, 4vw, 2.8rem); line-height: 1.18; margin-bottom: 16px;
}
.article-meta { font-size: 0.88rem; color: var(--ink-soft); opacity: 0.7; margin-bottom: 32px; }
.article-meta span { margin: 0 4px; }

.article-body { font-size: 1.06rem; }
.article-body > p { margin: 0 0 20px; }
.article-body h2 {
  font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark);
  font-size: clamp(1.4rem, 2.6vw, 1.85rem); line-height: 1.25; margin: 44px 0 16px;
}
.article-body h3 {
  font-family: var(--font-body); font-weight: 700; color: var(--ink-dark);
  font-size: 1.2rem; margin: 30px 0 12px;
}
.article-body strong { color: var(--ink-dark); font-weight: 600; }
.article-body em { font-style: italic; }
.article-body ul, .article-body ol { margin: 0 0 22px; padding-left: 24px; }
.article-body li { margin-bottom: 8px; }
.article-body a { font-weight: 500; border-bottom: 1px solid var(--accent-light); }
.article-body a:hover { border-color: var(--accent-color); }

/* Đoạn trả lời thẳng đầu bài (citable cho AI) */
.article-body > p:first-of-type {
  font-size: 1.14rem; color: var(--ink-dark); background: var(--surface-color);
  border-left: 3px solid var(--accent-color); padding: 18px 22px; border-radius: 0 var(--radius) var(--radius) 0;
  box-shadow: var(--shadow);
}

/* Bảng so sánh */
.article-body table {
  width: 100%; border-collapse: collapse; margin: 24px 0; font-size: 0.96rem;
  background: var(--surface-color); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow);
}
.article-body th, .article-body td { padding: 12px 16px; text-align: left; border-bottom: 1px solid rgba(44,26,18,0.08); }
.article-body th { background: var(--accent-light); color: var(--ink-dark); font-weight: 600; }
.article-body tr:last-child td { border-bottom: none; }

/* ===== FAQ ===== */
.faq-block { max-width: var(--reading-max); margin: 56px auto 0; }
.faq-block h2 { font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark); font-size: 1.6rem; margin-bottom: 20px; }
.faq-block details {
  background: var(--surface-color); border-radius: var(--radius); padding: 4px 22px;
  margin-bottom: 12px; box-shadow: var(--shadow); border: 1px solid rgba(44,26,18,0.05);
}
.faq-block summary {
  font-weight: 600; color: var(--ink-dark); cursor: pointer; padding: 16px 0; list-style: none;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
}
.faq-block summary::-webkit-details-marker { display: none; }
.faq-block summary::after { content: "+"; color: var(--accent-color); font-size: 1.4rem; font-weight: 400; }
.faq-block details[open] summary::after { content: "−"; }
.faq-block details p { padding: 0 0 18px; margin: 0; color: var(--ink-soft); }

/* ===== Đọc thêm ===== */
.read-more { max-width: var(--reading-max); margin: 56px auto 0; }
.read-more h2 { font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark); font-size: 1.4rem; margin-bottom: 18px; }
.read-more ul { list-style: none; display: grid; gap: 12px; }
.read-more li a {
  display: block; background: var(--surface-color); padding: 16px 20px; border-radius: var(--radius);
  color: var(--ink-dark); font-weight: 500; box-shadow: var(--shadow); transition: all var(--transition);
  border: 1px solid rgba(44,26,18,0.05);
}
.read-more li a:hover { transform: translateY(-2px); box-shadow: var(--shadow-hover); color: var(--accent-color); }

/* ===== CTA ===== */
.cta-box {
  max-width: var(--reading-max); margin: 56px auto 0; background: var(--ink-dark); color: #fff;
  border-radius: var(--radius); padding: 40px; text-align: center;
}
.cta-box h2 { font-family: var(--font-heading); font-weight: 700; font-size: 1.6rem; margin-bottom: 12px; color: #fff; }
.cta-box p { opacity: 0.85; margin-bottom: 24px; }
.cta-box .btn-primary { background: var(--accent-color); }
.cta-box .btn-primary:hover { background: var(--accent-hover); }

/* ===== Blog index ===== */
.blog-hero { padding: 56px 0 24px; text-align: center; }
.blog-hero .eyebrow { display:inline-block; font-size: 0.78rem; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--accent-color); margin-bottom: 12px; }
.blog-hero h1 { font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark); font-size: clamp(2rem, 4vw, 3rem); margin-bottom: 12px; }
.blog-hero p { max-width: 600px; margin: 0 auto; opacity: 0.8; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 24px; padding: 32px 0 80px; }
.post-card {
  background: var(--surface-color); border-radius: var(--radius); padding: 28px; box-shadow: var(--shadow);
  transition: all var(--transition); border: 1px solid rgba(44,26,18,0.05); display: flex; flex-direction: column;
}
.post-card:hover { transform: translateY(-3px); box-shadow: var(--shadow-hover); }
.post-card .tag { font-size: 0.74rem; font-weight: 700; letter-spacing: 1px; text-transform: uppercase; color: var(--accent-color); margin-bottom: 10px; }
.post-card h2 { font-family: var(--font-heading); font-weight: 700; color: var(--ink-dark); font-size: 1.3rem; line-height: 1.3; margin-bottom: 10px; }
.post-card p { font-size: 0.94rem; opacity: 0.8; margin-bottom: 16px; flex: 1; }
.post-card .read-link { font-weight: 600; color: var(--accent-color); font-size: 0.92rem; }

/* ===== Footer ===== */
.footer { background: var(--ink-dark); color: var(--bg-color); padding: 40px 0; margin-top: 40px; }
.footer-inner { display: flex; justify-content: space-between; align-items: center; gap: 20px; flex-wrap: wrap; }
.footer strong { font-family: var(--font-heading); font-size: 1.1rem; display: block; margin-bottom: 4px; }
.footer span { opacity: 0.75; font-size: 0.9rem; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-links { display: none; }
  .header .container { height: 64px; }
  .article-body > p:first-of-type { font-size: 1.06rem; padding: 16px 18px; }
  .cta-box { padding: 32px 24px; }
  .footer-inner { flex-direction: column; text-align: center; }
}

@media (prefers-reduced-motion: reduce) {
  * { transition: none !important; scroll-behavior: auto !important; }
}