/* ============================================
   CLEAN-TECH HUGO THEME
   A minimal, clean tech blog theme
   ============================================ */

/* --- Design Tokens --- */
:root,
[data-theme='light'] {
  /* Surfaces */
  --color-bg: #f7f6f2;
  --color-surface: #ffffff;
  --color-surface-2: #f3f1ec;
  --color-border: #d4d1ca;
  --color-divider: #e5e3de;

  /* Text */
  --color-text: #28251d;
  --color-text-muted: #6b6a65;
  --color-text-faint: #9e9d98;

  /* Primary Accent — Teal */
  --color-primary: #01696f;
  --color-primary-hover: #0c4e54;

  /* Code */
  --color-code-bg: #f0eeea;
  --color-code-border: #dbd8d2;
  --color-code-text: #3c3a35;
  --color-inline-code-bg: #ebe9e4;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(40, 37, 29, 0.06);
  --shadow-md: 0 4px 12px rgba(40, 37, 29, 0.08);

  /* Syntax highlighting overrides */
  --hl-bg: #f8f7f4;
}

[data-theme='dark'] {
  /* Surfaces */
  --color-bg: #141312;
  --color-surface: #1c1b19;
  --color-surface-2: #242320;
  --color-border: #393836;
  --color-divider: #2c2b29;

  /* Text */
  --color-text: #cdccca;
  --color-text-muted: #918f8b;
  --color-text-faint: #5a5957;

  /* Primary Accent */
  --color-primary: #5aabb5;
  --color-primary-hover: #3d949e;

  /* Code */
  --color-code-bg: #1e1d1b;
  --color-code-border: #333230;
  --color-code-text: #c5c4c0;
  --color-inline-code-bg: #252421;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);

  /* Syntax highlighting overrides */
  --hl-bg: #1a1918;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg: #141312;
    --color-surface: #1c1b19;
    --color-surface-2: #242320;
    --color-border: #393836;
    --color-divider: #2c2b29;
    --color-text: #cdccca;
    --color-text-muted: #918f8b;
    --color-text-faint: #5a5957;
    --color-primary: #5aabb5;
    --color-primary-hover: #3d949e;
    --color-code-bg: #1e1d1b;
    --color-code-border: #333230;
    --color-code-text: #c5c4c0;
    --color-inline-code-bg: #252421;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.3);
    --hl-bg: #1a1918;
  }
}

/* --- Type Scale (fluid) --- */
:root {
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.83rem + 0.2vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1rem + 0.5vw, 1.375rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2rem);
  --text-2xl: clamp(2rem, 1.4rem + 2.5vw, 2.75rem);

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 250ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Fonts */
  --font-body: 'Satoshi', 'Inter', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;

  /* Content widths */
  --content-narrow: 680px;
  --content-default: 960px;
  --content-wide: 1140px;
}

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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 6rem;
}

body {
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

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

::selection {
  background: rgba(1, 105, 111, 0.15);
  color: var(--color-text);
}

:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--content-wide);
  margin: 0 auto;
  padding-inline: var(--space-6);
  overflow-x: hidden;
}

.container--narrow {
  max-width: var(--content-narrow);
}

.main-content {
  flex: 1;
  padding-block: var(--space-12);
}

/* --- Header --- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-divider);
  transition: background-color var(--transition-normal),
              border-color var(--transition-normal),
              box-shadow var(--transition-normal);
}

.site-header.scrolled {
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: var(--space-4);
  min-height: 4.5rem;
}

/* --- Icon logo (left) --- */
.site-logo {
  display: inline-flex;
  align-items: center;
  justify-self: start;
  text-decoration: none;
  transition: opacity var(--transition-fast);
}
.site-logo:hover {
  opacity: 0.8;
}
.site-logo-img {
  display: block;
  height: 56px;
  width: auto;
}

/* --- Wordmark (center) --- */
.site-wordmark {
  display: flex;
  align-items: center;
  justify-content: center;
  justify-self: center;
  min-width: 0;
}
.site-wordmark-img {
  display: block;
  /* Source image is 1400x320 (4.375:1). Size by width so it actually fills
     the center column instead of being pinned to a tiny height. */
  width: clamp(360px, 28vw, 680px);
  height: auto;
  max-height: 112px;
  object-fit: contain;
}

/* --- Theme-based image switching --- */
/* Light theme: show light-version images, hide dark */
[data-theme='light'] .site-logo-img--dark,
[data-theme='light'] .site-wordmark-img--dark {
  display: none;
}
/* Dark theme: show dark-version images, hide light */
[data-theme='dark'] .site-logo-img--light,
[data-theme='dark'] .site-wordmark-img--light {
  display: none;
}
/* Fallback: if no data-theme set, respect system preference */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .site-logo-img--light,
  :root:not([data-theme]) .site-wordmark-img--light {
    display: none;
  }
}
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) .site-logo-img--dark,
  :root:not([data-theme]) .site-wordmark-img--dark {
    display: none;
  }
}

/* Main nav */
.main-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.nav-links {
  display: flex;
  list-style: none;
  gap: var(--space-5);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-muted);
  text-decoration: none;
  padding: var(--space-1) 0;
  position: relative;
}
.nav-links a:hover,
.nav-links a[aria-current="page"] {
  color: var(--color-text);
}
.nav-links a[aria-current="page"]::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
  border-radius: 1px;
}

/* Theme toggle */
.theme-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.theme-toggle:hover {
  color: var(--color-text);
  background: var(--color-surface-2);
}

/* Mobile menu */
.mobile-menu-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  background: transparent;
  color: var(--color-text);
  cursor: pointer;
}

@media (max-width: 768px) {
  .site-wordmark {
    display: none;
  }
}

@media (max-width: 640px) {
  .post-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
  }
  .post-item-date {
    order: -1;
  }
  .post-item-tags {
    margin-left: 0;
  }
  .nav-links {
    display: none;
    position: absolute;
    top: 4.5rem;
    left: 0;
    right: 0;
    flex-direction: column;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-divider);
    padding: var(--space-4) var(--space-6);
    gap: var(--space-3);
  }
  .nav-links.open {
    display: flex;
  }
  .mobile-menu-btn {
    display: flex;
  }
}

/* --- Footer --- */
.site-footer {
  border-top: 1px solid var(--color-divider);
  padding-block: var(--space-8);
  color: var(--color-text-faint);
  font-size: var(--text-xs);
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-4);
}
.footer-links {
  display: flex;
  list-style: none;
  gap: var(--space-4);
}
.footer-links a {
  color: var(--color-text-faint);
}
.footer-links a:hover {
  color: var(--color-text-muted);
}

/* --- Home Page --- */
.hero {
  padding-block: var(--space-16) var(--space-12);
}
.hero h1 {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
  margin-bottom: var(--space-4);
}
.hero p {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  max-width: 540px;
  line-height: 1.7;
}

/* Post list */
.posts-section {
  padding-block: var(--space-8);
}

.section-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-6);
  letter-spacing: -0.01em;
}

.post-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.post-item {
  display: flex;
  align-items: baseline;
  gap: var(--space-4);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-divider);
  transition: border-color var(--transition-fast);
}
.post-item:last-child {
  border-bottom: none;
}
.post-item:hover {
  border-color: var(--color-border);
}

.post-item-date {
  flex-shrink: 0;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-variant-numeric: tabular-nums;
  min-width: 5.5rem;
}

.post-item-title {
  font-size: var(--text-base);
  font-weight: 500;
}
.post-item-title a {
  color: var(--color-text);
  text-decoration: none;
}
.post-item-title a:hover {
  color: var(--color-primary);
}

.post-item-tags {
  display: flex;
  gap: var(--space-2);
  margin-left: auto;
  flex-shrink: 0;
}

.tag {
  display: inline-block;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  background: var(--color-surface-2);
  padding: 0.15em 0.55em;
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.tag:hover {
  background: var(--color-primary);
  color: #fff;
}

.view-all {
  display: inline-block;
  margin-top: var(--space-6);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-primary);
}
.view-all:hover {
  text-decoration: underline;
}

/* --- List Pages --- */
.page-header {
  padding-block: var(--space-10) var(--space-6);
}
.page-header h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
}
.page-header p {
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* Taxonomy page */
.taxonomy-list {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding-block: var(--space-6);
}
.taxonomy-item {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text);
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  text-decoration: none;
  transition: border-color var(--transition-fast), background var(--transition-fast);
}
.taxonomy-item:hover {
  border-color: var(--color-primary);
  background: var(--color-surface-2);
  color: var(--color-primary);
}
.taxonomy-count {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  font-weight: 400;
}

/* --- Single Post --- */
.article-header {
  padding-block: var(--space-10) var(--space-6);
  max-width: var(--content-narrow);
}

.article-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}
.article-meta time {
  font-variant-numeric: tabular-nums;
}
.article-meta .separator {
  color: var(--color-divider);
}

.article-title {
  font-size: var(--text-2xl);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.025em;
}

.article-tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-top: var(--space-4);
}

/* Article layout with TOC */
.article-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  max-width: var(--content-default);
}

@media (min-width: 960px) {
  .article-layout {
    grid-template-columns: minmax(0, var(--content-narrow)) 220px;
  }
}

/* Article body */
.article-body {
  max-width: var(--content-narrow);
  font-size: var(--text-base);
  line-height: 1.7;
  overflow-wrap: break-word;
  word-break: break-word;
  min-width: 0;
}

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

.article-body h2 {
  font-size: var(--text-lg);
  font-weight: 700;
  margin-top: var(--space-10);
  margin-bottom: var(--space-3);
  letter-spacing: -0.01em;
}

.article-body h3 {
  font-size: calc(var(--text-base) * 1.05);
  font-weight: 600;
  margin-top: var(--space-8);
  margin-bottom: var(--space-2);
}

.article-body h4 {
  font-size: var(--text-base);
  font-weight: 600;
  margin-top: var(--space-6);
  margin-bottom: var(--space-2);
}

.article-body p {
  max-width: 65ch;
  overflow-wrap: break-word;
  word-break: break-word;
}

.article-body a {
  text-decoration: underline;
  text-decoration-color: rgba(1, 105, 111, 0.3);
  text-underline-offset: 2px;
}
.article-body a:hover {
  text-decoration-color: var(--color-primary);
}

.article-body strong {
  font-weight: 600;
}

.article-body blockquote {
  border-left: 3px solid var(--color-primary);
  padding-left: var(--space-5);
  color: var(--color-text-muted);
  font-style: italic;
}

.article-body ul,
.article-body ol {
  padding-left: var(--space-6);
}
.article-body li {
  margin-top: var(--space-2);
}
.article-body li::marker {
  color: var(--color-text-faint);
}
.article-body li {
  overflow-wrap: break-word;
  word-break: break-word;
}

.article-body img {
  border-radius: var(--radius-md);
  margin-block: var(--space-4);
}

.article-body hr {
  border: none;
  border-top: 1px solid var(--color-divider);
  margin-block: var(--space-8);
}

/* Inline code */
.article-body code:not(pre code) {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-inline-code-bg);
  padding: 0.15em 0.4em;
  border-radius: var(--radius-sm);
  color: var(--color-code-text);
}

/* Code blocks */
.article-body pre {
  background: var(--color-code-bg);
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-size: var(--text-xs);
  line-height: 1.65;
  -webkit-overflow-scrolling: touch;
}
.article-body pre code {
  font-family: var(--font-mono);
  background: none;
  padding: 0;
  border-radius: 0;
  color: inherit;
  font-size: inherit;
}

/* Hugo syntax highlighting wrapper */
.highlight {
  margin-block: var(--space-5);
}
.highlight pre {
  border: 1px solid var(--color-code-border);
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  font-size: var(--text-xs);
  line-height: 1.65;
}

/* Tables */
.article-body table {
  width: 100%;
  border-collapse: collapse;
  margin-block: var(--space-5);
  font-size: var(--text-sm);
}
.article-body th,
.article-body td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-divider);
}
.article-body th {
  font-weight: 600;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* --- Table of Contents --- */
.toc-sidebar {
  display: none;
}

@media (min-width: 960px) {
  .toc-sidebar {
    display: block;
    position: sticky;
    top: 5rem;
    align-self: start;
    max-height: calc(100vh - 6rem);
    overflow-y: auto;
  }
}

.toc-title {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin-bottom: var(--space-3);
}

.toc-sidebar nav ul {
  list-style: none;
  padding: 0;
}
.toc-sidebar nav li {
  margin-bottom: var(--space-1);
}
.toc-sidebar nav a {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-decoration: none;
  padding: var(--space-1) var(--space-3);
  border-left: 2px solid transparent;
  transition: color var(--transition-fast), border-color var(--transition-fast);
  line-height: 1.4;
}
.toc-sidebar nav a:hover {
  color: var(--color-text);
}
.toc-sidebar nav a.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
}
.toc-sidebar nav ul ul {
  padding-left: var(--space-3);
}

/* Mobile TOC */
.toc-mobile {
  display: block;
  margin-bottom: var(--space-6);
  padding: var(--space-4);
  background: var(--color-surface);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-md);
}
.toc-mobile summary {
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  color: var(--color-text-muted);
  list-style: none;
}
.toc-mobile summary::before {
  content: '▸ ';
}
.toc-mobile[open] summary::before {
  content: '▾ ';
}
.toc-mobile nav {
  margin-top: var(--space-3);
}
.toc-mobile nav ul {
  list-style: none;
  padding: 0;
}
.toc-mobile nav li {
  margin-bottom: var(--space-1);
}
.toc-mobile nav a {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  text-decoration: none;
}
.toc-mobile nav a:hover {
  color: var(--color-primary);
}
.toc-mobile nav ul ul {
  padding-left: var(--space-4);
}

@media (min-width: 960px) {
  .toc-mobile {
    display: none;
  }
}

/* --- Post navigation --- */
.post-nav {
  display: flex;
  justify-content: space-between;
  gap: var(--space-4);
  margin-top: var(--space-12);
  padding-top: var(--space-8);
  border-top: 1px solid var(--color-divider);
  max-width: var(--content-narrow);
}
.post-nav a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  max-width: 50%;
}
.post-nav a:hover {
  color: var(--color-primary);
}
.post-nav-label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin-bottom: var(--space-1);
}

/* --- Pagination --- */
.pagination {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-10);
  font-size: var(--text-sm);
}
.pagination a,
.pagination span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2rem;
  height: 2rem;
  padding: 0 var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  text-decoration: none;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.pagination a:hover {
  background: var(--color-surface-2);
  color: var(--color-text);
}
.pagination .active {
  background: var(--color-primary);
  color: #fff;
  font-weight: 600;
}

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

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}