/* ============================================================
   ALLBLOG — Design System
   A warm, reading-optimized stylesheet.
   ============================================================ */

/* --- Reset & Base --- */

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

:root {
  /* Palette */
  --color-bg: #fffff8;
  --color-bg-alt: #faf8f0;
  --color-surface: #ffffff;
  --color-ink: #2c2416;
  --color-ink-light: #6b5e4f;
  --color-ink-muted: #9e9487;
  --color-accent: #b8533e;
  --color-accent-hover: #973f2e;
  --color-border: #e8e2d6;
  --color-border-light: #f0ece4;

  /* Typography */
  --font-serif: 'Lora', Georgia, 'Times New Roman', serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Sizing */
  --content-width: 680px;
  --page-width: 1080px;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;

  /* Transitions */
  --transition: 0.2s ease;
}

html {
  font-size: 18px;
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-serif);
  color: var(--color-ink);
  background-color: var(--color-bg);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* --- Links --- */

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

a:hover {
  color: var(--color-accent-hover);
}

/* --- Header --- */

.site-header {
  border-bottom: 1px solid var(--color-border-light);
  background: var(--color-bg);
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
}

.site-nav {
  max-width: var(--page-width);
  margin: 0 auto;
  padding: var(--space-md) var(--space-lg);
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.site-logo {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  color: var(--color-ink);
  text-decoration: none;
}

.site-logo:hover {
  color: var(--color-accent);
}

.site-nav-links {
  display: flex;
  gap: var(--space-lg);
}

.site-nav-links a {
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-ink-light);
  text-decoration: none;
  transition: color var(--transition);
}

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

/* --- Main --- */

.site-main {
  flex: 1;
  max-width: var(--content-width);
  margin: 0 auto;
  padding: var(--space-2xl) var(--space-lg);
  width: 100%;
}

/* --- Footer --- */

.site-footer {
  border-top: 1px solid var(--color-border-light);
  padding: var(--space-xl) var(--space-lg);
  margin-top: auto;
}

.footer-inner {
  max-width: var(--page-width);
  margin: 0 auto;
  text-align: center;
}

.site-footer p {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-ink-muted);
}

/* --- Prose (article body) --- */

.prose {
  line-height: 1.8;
}

.prose h2 {
  font-size: 1.5rem;
  font-weight: 600;
  margin-top: var(--space-2xl);
  margin-bottom: var(--space-md);
  letter-spacing: -0.01em;
}

.prose h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin-top: var(--space-xl);
  margin-bottom: var(--space-sm);
}

.prose p {
  margin-bottom: var(--space-lg);
}

.prose ul,
.prose ol {
  margin-bottom: var(--space-lg);
  padding-left: var(--space-xl);
}

.prose li {
  margin-bottom: var(--space-sm);
}

.prose blockquote {
  border-left: 3px solid var(--color-accent);
  margin: var(--space-xl) 0;
  padding: var(--space-md) var(--space-lg);
  font-style: italic;
  color: var(--color-ink-light);
  background: var(--color-bg-alt);
  border-radius: 0 4px 4px 0;
}

.prose code {
  font-size: 0.9em;
  background: var(--color-bg-alt);
  padding: 0.15em 0.4em;
  border-radius: 3px;
  font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
}

.prose pre {
  background: var(--color-ink);
  color: var(--color-bg);
  padding: var(--space-lg);
  border-radius: 6px;
  overflow-x: auto;
  margin-bottom: var(--space-lg);
  line-height: 1.5;
}

.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.prose img {
  max-width: 100%;
  height: auto;
  border-radius: 6px;
  margin: var(--space-lg) 0;
}

.prose hr {
  border: none;
  border-top: 1px solid var(--color-border);
  margin: var(--space-2xl) 0;
}

.prose a {
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* --- Post --- */

.post-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border-light);
}

.post-title {
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-md);
}

.post-meta {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  color: var(--color-ink-muted);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-wrap: wrap;
}

.post-author {
  color: var(--color-accent);
  font-weight: 500;
  text-decoration: none;
}

.post-author:hover {
  text-decoration: underline;
}

.post-meta-sep {
  color: var(--color-border);
}

/* --- Profile --- */

.profile-header {
  margin-bottom: var(--space-2xl);
  padding-bottom: var(--space-xl);
  border-bottom: 1px solid var(--color-border-light);
}

.profile-name {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-xs);
}

.profile-handle {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-md);
}

.profile-bio {
  font-size: 1.05rem;
  color: var(--color-ink-light);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.profile-social {
  display: flex;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.profile-social-link {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--color-accent);
  padding: var(--space-xs) var(--space-sm);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  transition: all var(--transition);
}

.profile-social-link:hover {
  background: var(--color-bg-alt);
  border-color: var(--color-accent);
}

/* --- Language filter tabs --- */

.profile-lang-filter {
  display: flex;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
  flex-wrap: wrap;
}

.lang-tab {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 500;
  padding: var(--space-xs) var(--space-md);
  border: 1px solid var(--color-border);
  border-radius: 20px;
  background: transparent;
  color: var(--color-ink-light);
  cursor: pointer;
  transition: all var(--transition);
}

.lang-tab:hover {
  border-color: var(--color-ink-light);
  color: var(--color-ink);
}

.lang-tab.active {
  background: var(--color-ink);
  color: var(--color-bg);
  border-color: var(--color-ink);
}

/* --- Post list (profile page) --- */

.post-list {
  list-style: none;
  padding: 0;
}

.post-list-item {
  border-bottom: 1px solid var(--color-border-light);
}

.post-list-link {
  display: block;
  padding: var(--space-lg) 0;
  text-decoration: none;
  color: inherit;
  transition: background var(--transition);
}

.post-list-link:hover {
  color: inherit;
}

.post-list-link:hover .post-list-title {
  color: var(--color-accent);
}

.post-list-title {
  font-size: 1.2rem;
  font-weight: 600;
  margin-bottom: var(--space-xs);
  transition: color var(--transition);
}

.post-list-meta {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  color: var(--color-ink-muted);
  display: flex;
  gap: var(--space-sm);
  align-items: center;
  margin-bottom: var(--space-xs);
}

.post-list-lang {
  background: var(--color-bg-alt);
  padding: 0.1em 0.5em;
  border-radius: 3px;
  font-weight: 500;
}

.post-list-desc {
  font-size: 0.9rem;
  color: var(--color-ink-light);
  line-height: 1.5;
}

/* --- Discover page --- */

.discover-header {
  margin-bottom: var(--space-2xl);
}

.discover-header h1 {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: var(--space-sm);
}

.discover-header p {
  color: var(--color-ink-light);
  font-size: 1.05rem;
}

.discover-section {
  margin-bottom: var(--space-2xl);
}

.discover-section h2 {
  font-family: var(--font-sans);
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
  margin-bottom: var(--space-lg);
}

/* --- Homepage hero --- */

.hero {
  text-align: center;
  padding: var(--space-2xl) 0;
}

.hero h1 {
  font-size: 2.8rem;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.03em;
  margin-bottom: var(--space-md);
}

.hero p {
  font-size: 1.15rem;
  color: var(--color-ink-light);
  max-width: 520px;
  margin: 0 auto var(--space-xl);
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: var(--space-md);
  flex-wrap: wrap;
}

.hero-cta {
  display: inline-block;
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-bg);
  background: var(--color-ink);
  padding: 0.75rem 2rem;
  border-radius: 6px;
  text-decoration: none;
  transition: all var(--transition);
}

.hero-cta:hover {
  background: var(--color-accent);
  color: var(--color-bg);
  transform: translateY(-1px);
}

.hero-cta-secondary {
  color: var(--color-ink);
  background: transparent;
  border: 1px solid var(--color-border);
}

.hero-cta-secondary:hover {
  color: var(--color-ink);
  background: var(--color-bg-alt);
}

/* --- Utility --- */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* --- Responsive --- */

@media (max-width: 640px) {
  html {
    font-size: 16px;
  }

  .post-title {
    font-size: 1.75rem;
  }

  .hero h1 {
    font-size: 2rem;
  }

  .site-main {
    padding: var(--space-xl) var(--space-md);
  }

  .site-nav {
    padding: var(--space-md);
  }
}