/* ==========================================================================
   btsapp.net — blog.css
   Styles /blog/, /blog/ar/, and /blog/article.html
   One file, RTL-aware, driven by logical properties.
   ========================================================================== */

/* ---------- 1. Design tokens ---------- */
:root {
  /* Colors — tweak here, cascades everywhere */
  --blog-bg:            #ffffff;
  --blog-surface:       #f7f8fa;
  --blog-surface-2:     #eef0f4;
  --blog-border:        #e3e6ec;
  --blog-text:          #14181f;
  --blog-text-muted:    #5a6473;
  --blog-text-faint:    #8a93a1;
  --blog-accent:        #0b5fff;
  --blog-accent-hover:  #0847c4;
  --blog-chip-bg:       #eef2ff;
  --blog-chip-text:     #2b47b8;
  --blog-shadow-sm:     0 1px 2px rgba(20, 24, 31, 0.06);
  --blog-shadow-md:     0 4px 12px rgba(20, 24, 31, 0.08);
  --blog-shadow-lg:     0 12px 32px rgba(20, 24, 31, 0.10);

  /* Type */
  --blog-font:          "Inter", system-ui, -apple-system, "Segoe UI", Roboto,
                        "Helvetica Neue", Arial, sans-serif;
  --blog-font-ar:       "Noto Kufi Arabic", "Tahoma", "Segoe UI",
                        system-ui, sans-serif;
  --blog-font-mono:     ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  /* Sizing */
  --blog-max:           1180px;
  --blog-gutter:        1.25rem;
  --blog-radius:        12px;
  --blog-radius-sm:     8px;
  --blog-radius-lg:     18px;

  /* Rhythm */
  --blog-space-1:       0.25rem;
  --blog-space-2:       0.5rem;
  --blog-space-3:       0.75rem;
  --blog-space-4:       1rem;
  --blog-space-5:       1.25rem;
  --blog-space-6:       1.5rem;
  --blog-space-8:       2rem;
  --blog-space-10:      2.5rem;
  --blog-space-12:      3rem;
  --blog-space-16:      4rem;
}

/* ---------- 2. Reset / base ---------- */
*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
}

body.blog-page {
  margin: 0;
  font-family: var(--blog-font);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--blog-text);
  background: var(--blog-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Arabic pages get an Arabic-capable font stack */
html[dir="rtl"] body.blog-page,
html[lang="ar"] body.blog-page {
  font-family: var(--blog-font-ar);
  line-height: 1.75;
}

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

a {
  color: var(--blog-accent);
  text-decoration: none;
  transition: color 0.15s ease;
}

a:hover,
a:focus-visible {
  color: var(--blog-accent-hover);
  text-decoration: underline;
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--blog-accent);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 3. Layout shell ---------- */
.blog-container {
  max-width: var(--blog-max);
  margin-inline: auto;
  padding-inline: var(--blog-gutter);
}

.blog-header {
  padding-block: var(--blog-space-10) var(--blog-space-8);
  border-bottom: 1px solid var(--blog-border);
}

.blog-header__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--blog-space-4);
}

.blog-header__title {
  margin: 0;
  font-size: clamp(1.75rem, 1rem + 3vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
}

html[dir="rtl"] .blog-header__title {
  letter-spacing: 0;
}

.blog-header__subtitle {
  margin: var(--blog-space-2) 0 0;
  color: var(--blog-text-muted);
  font-size: 1.05rem;
  max-width: 60ch;
}

.blog-header__back {
  font-size: 0.95rem;
  color: var(--blog-text-muted);
}

.blog-header__back:hover {
  color: var(--blog-accent);
}

/* Language cross-link (EN index → AR index and back) */
.blog-lang-switch {
  display: inline-flex;
  align-items: center;
  gap: var(--blog-space-2);
  padding: 0.5rem 0.9rem;
  border: 1px solid var(--blog-border);
  border-radius: 999px;
  font-size: 0.9rem;
  color: var(--blog-text-muted);
  background: var(--blog-surface);
}

.blog-lang-switch:hover {
  color: var(--blog-accent);
  border-color: var(--blog-accent);
  text-decoration: none;
}

/* ---------- 4. Index grid ---------- */
.blog-index {
  padding-block: var(--blog-space-12) var(--blog-space-16);
}

.blog-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--blog-space-6);
}

@media (min-width: 640px) {
  .blog-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 960px) {
  .blog-grid { grid-template-columns: repeat(3, 1fr); gap: var(--blog-space-8); }
}

/* ---------- 5. Post card ---------- */
.post-card {
  display: flex;
  flex-direction: column;
  background: var(--blog-bg);
  border: 1px solid var(--blog-border);
  border-radius: var(--blog-radius-lg);
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.post-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--blog-shadow-lg);
  border-color: transparent;
}

.post-card__cover-link {
  display: block;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--blog-surface-2);
}

.post-card__cover {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.post-card:hover .post-card__cover {
  transform: scale(1.04);
}

.post-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  padding: var(--blog-space-5) var(--blog-space-5) var(--blog-space-6);
}

.post-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--blog-space-3);
  margin-bottom: var(--blog-space-3);
  font-size: 0.8125rem;
  color: var(--blog-text-faint);
}

.post-card__date {
  font-variant-numeric: tabular-nums;
}

.post-card__meta-sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--blog-text-faint);
}

.post-card__title {
  margin: 0 0 var(--blog-space-3);
  font-size: 1.175rem;
  line-height: 1.35;
  font-weight: 700;
  letter-spacing: -0.01em;
}

html[dir="rtl"] .post-card__title {
  letter-spacing: 0;
}

.post-card__title a {
  color: var(--blog-text);
}

.post-card__title a:hover {
  color: var(--blog-accent);
  text-decoration: none;
}

.post-card__summary {
  margin: 0 0 var(--blog-space-5);
  color: var(--blog-text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* Category chips (auto-split from the comma-separated `category` field) */
.post-card__chips,
.article-chips {
  display: flex;
  flex-wrap: wrap;
  gap: var(--blog-space-2);
  margin: 0;
  padding: 0;
  list-style: none;
}

.chip {
  display: inline-block;
  padding: 0.25rem 0.625rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: var(--blog-chip-text);
  background: var(--blog-chip-bg);
  border-radius: 999px;
  white-space: nowrap;
}

/* ---------- 6. Empty state ---------- */
.blog-empty {
  padding-block: var(--blog-space-16);
  text-align: center;
  color: var(--blog-text-muted);
}

.blog-empty__title {
  margin: 0 0 var(--blog-space-2);
  font-size: 1.25rem;
  color: var(--blog-text);
}

.blog-empty__text {
  margin: 0;
  font-size: 0.95rem;
}

/* ---------- 7. Loading state ---------- */
.blog-loading {
  padding-block: var(--blog-space-16);
  text-align: center;
  color: var(--blog-text-faint);
  font-size: 0.95rem;
}

.blog-loading__dots {
  display: inline-flex;
  gap: 6px;
  margin-top: var(--blog-space-3);
}

.blog-loading__dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--blog-accent);
  opacity: 0.3;
  animation: blog-pulse 1s infinite ease-in-out;
}

.blog-loading__dots span:nth-child(2) { animation-delay: 0.15s; }
.blog-loading__dots span:nth-child(3) { animation-delay: 0.30s; }

@keyframes blog-pulse {
  0%, 80%, 100% { opacity: 0.3; transform: scale(0.9); }
  40%           { opacity: 1;   transform: scale(1.1); }
}

/* ---------- 8. Article page ---------- */
.article {
  padding-block: var(--blog-space-10) var(--blog-space-16);
}

.article__back {
  display: inline-flex;
  align-items: center;
  gap: var(--blog-space-2);
  margin-bottom: var(--blog-space-8);
  font-size: 0.9rem;
  color: var(--blog-text-muted);
}

.article__back:hover {
  color: var(--blog-accent);
  text-decoration: none;
}

.article__back-arrow {
  transition: transform 0.2s ease;
}

html[dir="ltr"] .article__back:hover .article__back-arrow { transform: translateX(-3px); }
html[dir="rtl"] .article__back:hover .article__back-arrow { transform: translateX(3px); }

.article__header {
  max-width: 48rem;
  margin-inline: auto;
  margin-bottom: var(--blog-space-8);
  text-align: start;
}

.article__chips {
  margin-bottom: var(--blog-space-4);
}

.article__title {
  margin: 0 0 var(--blog-space-4);
  font-size: clamp(1.75rem, 1.2rem + 2.4vw, 2.75rem);
  line-height: 1.15;
  letter-spacing: -0.02em;
  font-weight: 700;
}

html[dir="rtl"] .article__title {
  letter-spacing: 0;
}

.article__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--blog-space-3);
  color: var(--blog-text-faint);
  font-size: 0.9rem;
}

.article__meta-sep {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--blog-text-faint);
}

.article__hero {
  max-width: 56rem;
  margin-inline: auto;
  margin-bottom: var(--blog-space-12);
  border-radius: var(--blog-radius-lg);
  overflow: hidden;
  background: var(--blog-surface-2);
}

.article__hero img {
  width: 100%;
  height: auto;
}

/* Content blocks (rendered from the `content[]` array) */
.article__content {
  max-width: 44rem;
  margin-inline: auto;
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--blog-text);
}

html[dir="rtl"] .article__content {
  font-size: 1.125rem;
  line-height: 1.85;
}

.article__content > * + * {
  margin-top: var(--blog-space-5);
}

.article__content h2 {
  margin-top: var(--blog-space-10);
  margin-bottom: var(--blog-space-3);
  font-size: 1.5rem;
  line-height: 1.3;
  font-weight: 700;
  letter-spacing: -0.01em;
}

html[dir="rtl"] .article__content h2 {
  letter-spacing: 0;
  font-size: 1.625rem;
}

.article__content p {
  margin: 0;
}

.article__content figure {
  margin-block: var(--blog-space-8);
  margin-inline: 0;
}

.article__content figure img {
  width: 100%;
  border-radius: var(--blog-radius);
  background: var(--blog-surface-2);
}

.article__content figcaption {
  margin-top: var(--blog-space-3);
  font-size: 0.875rem;
  color: var(--blog-text-faint);
  text-align: center;
  line-height: 1.5;
}

/* Article footer / back link */
.article__footer {
  max-width: 44rem;
  margin: var(--blog-space-16) auto 0;
  padding-top: var(--blog-space-8);
  border-top: 1px solid var(--blog-border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--blog-space-4);
  flex-wrap: wrap;
}

.article__footer .blog-lang-switch {
  font-size: 0.85rem;
}

/* ---------- 9. 404 / missing article ---------- */
.article-missing {
  max-width: 40rem;
  margin: var(--blog-space-16) auto;
  text-align: center;
  color: var(--blog-text-muted);
}

.article-missing__title {
  margin: 0 0 var(--blog-space-3);
  font-size: 1.5rem;
  color: var(--blog-text);
}

.article-missing__code {
  display: inline-block;
  margin-bottom: var(--blog-space-4);
  padding: 0.25rem 0.75rem;
  font-family: var(--blog-font-mono);
  font-size: 0.8rem;
  color: var(--blog-text-muted);
  background: var(--blog-surface-2);
  border-radius: 6px;
}

/* ---------- 10. Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- 11. Print (nice-to-have) ---------- */
@media print {
  .blog-header__back,
  .blog-lang-switch,
  .article__back,
  .article__footer {
    display: none;
  }
  .post-card,
  .article__hero {
    box-shadow: none;
    border: 1px solid #ccc;
  }
}