:root {
  --ocean-blue: #3a7ca5;
  --sandy-cream: #faf6ee;
  --clay: #b5651d;
  --text-dark: #2e2a25;
  --ocean-blue-soft: #e8f1f6;
  --clay-soft: #f7e9dc;
  --line-soft: #e3dcca;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: var(--sandy-cream);
  color: var(--text-dark);
  line-height: 1.6;
}

a {
  color: var(--ocean-blue);
}

/* ---------- Site nav ---------- */

.site-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 960px;
  margin: 0 auto;
  padding: 1.1rem 1.5rem;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.site-nav .brand {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--text-dark);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.site-nav .brand span {
  color: var(--clay);
}

.site-nav .nav-links {
  display: flex;
  gap: 1.75rem;
}

.site-nav .nav-links a {
  color: var(--text-dark);
  text-decoration: none;
  font-weight: 600;
  font-size: 0.98rem;
  padding-bottom: 0.2rem;
  border-bottom: 2px solid transparent;
}

.site-nav .nav-links a:hover {
  color: var(--ocean-blue);
}

.site-nav .nav-links a.active {
  color: var(--clay);
  border-bottom-color: var(--clay);
}

/* ---------- Header (page hero) ---------- */

header.page-header {
  background-color: var(--ocean-blue);
  color: white;
  text-align: center;
  padding: 3rem 1.5rem 2.5rem;
}

header.page-header h1 {
  font-size: 2.2rem;
  margin-bottom: 0.75rem;
}

header.page-header p {
  font-size: 1.1rem;
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.subscribe-btn {
  display: inline-block;
  background-color: var(--clay);
  color: white;
  text-decoration: none;
  padding: 0.75rem 1.75rem;
  border-radius: 30px;
  font-weight: bold;
  transition: background-color 0.2s ease;
}

.subscribe-btn:hover {
  background-color: #94530f;
}

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

section {
  margin-bottom: 3.5rem;
}

section h2 {
  color: var(--ocean-blue);
  font-size: 1.6rem;
  margin-bottom: 1.5rem;
  border-bottom: 2px solid var(--clay);
  display: inline-block;
  padding-bottom: 0.25rem;
}

/* ---------- Video grid (home page) ---------- */

.video-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 2rem;
}

.video-item iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  border: none;
  border-radius: 8px;
}

.video-item p {
  margin-top: 0.5rem;
  font-weight: 600;
  text-align: center;
}

.about-text {
  max-width: 720px;
}

/* ---------- Contact form ---------- */

form {
  max-width: 500px;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

form label {
  font-weight: 600;
}

form input,
form textarea {
  padding: 0.65rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-family: inherit;
  font-size: 1rem;
}

form textarea {
  min-height: 120px;
  resize: vertical;
}

form button {
  background-color: var(--ocean-blue);
  color: white;
  border: none;
  padding: 0.75rem;
  border-radius: 6px;
  font-weight: bold;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.2s ease;
}

form button:hover {
  background-color: #2e6488;
}

footer {
  background-color: var(--ocean-blue);
  color: white;
  text-align: center;
  padding: 1.5rem;
  font-size: 0.9rem;
}

footer a {
  color: var(--sandy-cream);
}

/* ---------- Blog listing page ---------- */

.blog-intro {
  max-width: 680px;
  margin: 0 auto 2.5rem;
  text-align: center;
  color: #55503f;
}

.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.75rem;
}

/* Mini-books grid: like .blog-grid, but cards keep a normal
   card width instead of stretching to fill the row when there
   are only one or two items. */
.mini-books-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 300px));
  gap: 1.75rem;
}

.post-card {
  background: white;
  border: 1px solid var(--line-soft);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: inherit;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.post-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(46, 42, 37, 0.08);
}

.post-card .thumb {
  background: var(--ocean-blue-soft);
  padding: 1.25rem;
}

.post-card .thumb svg {
  width: 100%;
  height: auto;
  display: block;
}

.post-card .card-body {
  padding: 1.1rem 1.25rem 1.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  flex: 1;
}

.post-card .card-category {
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clay);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.post-card h3 {
  font-size: 1.15rem;
  color: var(--text-dark);
  line-height: 1.35;
}

.post-card p.excerpt {
  font-size: 0.95rem;
  color: #55503f;
  flex: 1;
}

.post-card .card-meta {
  font-size: 0.85rem;
  color: #8a8370;
}

.blog-empty {
  text-align: center;
  color: #8a8370;
  padding: 2rem 0;
}

/* ---------- Individual post page ---------- */

.post-header {
  max-width: 720px;
  margin: 0 auto 2rem;
  text-align: center;
}

.post-header .post-category {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--clay);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 0.6rem;
}

.post-header h1 {
  font-size: 2rem;
  color: var(--text-dark);
  margin-bottom: 0.6rem;
  line-height: 1.3;
}

.post-header .post-date {
  color: #8a8370;
  font-size: 0.9rem;
}

.post-hero-svg {
  max-width: 720px;
  margin: 0 auto 2.5rem;
}

.post-hero-svg svg {
  width: 100%;
  height: auto;
  display: block;
}

.post-body {
  max-width: 720px;
  margin: 0 auto;
}

.post-body h2 {
  color: var(--ocean-blue);
  font-size: 1.4rem;
  margin: 2.25rem 0 1rem;
  border-bottom: 2px solid var(--clay);
  display: inline-block;
  padding-bottom: 0.2rem;
}

.post-body p {
  margin-bottom: 1rem;
  color: var(--text-dark);
}

.post-body ul, .post-body ol {
  margin: 0 0 1rem 1.4rem;
}

.post-body li {
  margin-bottom: 0.4rem;
}

/* Vocabulary flashcards */

.flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: 1rem;
  margin: 1.25rem 0 1.75rem;
}

.flashcard {
  background: white;
  border: 2px solid var(--ocean-blue);
  border-radius: 10px;
  padding: 1rem 1.15rem;
}

.flashcard .card-mg {
  color: var(--clay);
  font-weight: 700;
  font-size: 1.15rem;
  display: block;
  margin-bottom: 0.15rem;
}

.flashcard .card-en {
  color: var(--text-dark);
  font-weight: 600;
  display: block;
}

.flashcard .card-pron {
  font-style: italic;
  color: #7a7460;
  font-size: 0.88rem;
  display: block;
  margin-top: 0.35rem;
}

/* Example conversation */

.conversation-box {
  background: white;
  border-left: 4px solid var(--ocean-blue);
  border-radius: 6px;
  padding: 1.1rem 1.3rem;
  margin: 1.25rem 0 1.75rem;
}

.conversation-box .line {
  margin-bottom: 0.75rem;
}

.conversation-box .line:last-child {
  margin-bottom: 0;
}

.conversation-box .speaker {
  font-weight: 700;
  color: var(--ocean-blue);
  margin-right: 0.4rem;
}

.conversation-box .mg-line {
  color: var(--clay);
  font-style: italic;
  font-size: 0.92rem;
}

/* Practice section */

.practice-box {
  background: var(--clay-soft);
  border-radius: 10px;
  padding: 1.25rem 1.4rem;
  margin: 1.25rem 0 1.75rem;
}

.practice-box ol {
  margin-left: 1.2rem;
}

.practice-box details {
  margin-top: 1rem;
  cursor: pointer;
}

.practice-box summary {
  font-weight: 700;
  color: var(--clay);
}

.practice-box .answers {
  margin-top: 0.6rem;
  padding-left: 1.2rem;
}

/* Related content */

.related-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-top: 1rem;
}

.related-card {
  display: block;
  background: white;
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  text-decoration: none;
  color: var(--text-dark);
  font-weight: 600;
}

.related-card:hover {
  border-color: var(--ocean-blue);
}

.related-card .tag {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--ocean-blue);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}

/* Post navigation: prev / next */

.post-nav {
  max-width: 720px;
  margin: 3rem auto 0;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
  border-top: 2px solid var(--line-soft);
  padding-top: 2rem;
}

.post-nav a {
  display: block;
  background: white;
  border: 1px solid var(--line-soft);
  border-radius: 10px;
  padding: 1rem 1.2rem;
  text-decoration: none;
  color: var(--text-dark);
  transition: border-color 0.15s ease;
}

.post-nav a:hover {
  border-color: var(--ocean-blue);
}

.post-nav .nav-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  color: var(--clay);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.3rem;
}

.post-nav .nav-title {
  font-weight: 700;
  color: var(--ocean-blue);
}

.post-nav .prev-post {
  text-align: left;
}

.post-nav .next-post {
  text-align: right;
}

.post-nav .next-post .nav-label,
.post-nav .next-post .nav-title {
  text-align: right;
}

@media (max-width: 560px) {
  .post-nav {
    grid-template-columns: 1fr;
  }
  .post-nav .next-post {
    text-align: left;
  }
  .post-nav .next-post .nav-label,
  .post-nav .next-post .nav-title {
    text-align: left;
  }
}