/* ==========================================================================
   anderskev.com — Site Styles
   Dark academic editorial · Newsreader + IBM Plex Mono
   ========================================================================== */

/* Section 1: CSS Custom Properties
   ========================================================================== */

:root {
  --base-100: #0A1420;
  --base-200: #16202C;
  --base-300: #222C38;
  --text: #EAF2EF;
  --text-secondary: #88A59C;
  --text-tertiary: #7A9A8F;
  --primary: #FD8017;
  --secondary: #ABFAA9;
  --azure: #6290C8;
  --content-width: 740px;
  --wide-width: 960px;
  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --hover-surface: rgba(22, 32, 44, 0.2);
  --hover-border: rgba(253, 128, 23, 0.5);
  --row-border: rgba(34, 44, 56, 0.5);
}

/* Section 2: @font-face declarations
   ========================================================================== */

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("/fonts/ibm-plex-mono-v19-latin-regular.woff2") format("woff2");
}

@font-face {
  font-family: "IBM Plex Mono";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("/fonts/ibm-plex-mono-v19-latin-700.woff2") format("woff2");
}

/* Section 3: Base reset and body styles
   ========================================================================== */

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

html { scroll-behavior: smooth; }

body {
  font-family: "Newsreader", "Georgia", serif;
  background: var(--base-100);
  color: var(--text);
  margin: 0;
  line-height: 1.75;
  font-size: 1.125rem;
  font-kerning: normal;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--azure); text-decoration: none; }
a:hover { color: var(--secondary); }

/* Section 4: Scroll Progress Bar
   ========================================================================== */

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 2px;
  z-index: 9999;
  background: var(--primary);
  transform-origin: left;
  transform: scaleX(0);
  animation: scroll-progress linear both;
  animation-timeline: scroll(root);
}

@keyframes scroll-progress { to { transform: scaleX(1); } }

/* Section 5: Layout
   ========================================================================== */

.content-wrap {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 2rem 1.5rem;
}

/* Section 6: Navigation
   ========================================================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--wide-width);
  margin: 0 auto;
  padding: 20px 24px;
  transition: padding 250ms ease, backdrop-filter 250ms ease, background 250ms ease;
}

.site-nav.scrolled {
  padding: 12px 24px;
  backdrop-filter: blur(16px);
  background: rgba(10, 20, 32, 0.88);
  border-bottom: 1px solid var(--base-300);
}

.site-title {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  color: var(--primary);
  font-weight: 400;
  font-size: 0.875rem;
  letter-spacing: 0.02em;
}

.site-title:hover {
  color: var(--secondary);
}

.nav-links {
  display: flex;
  gap: 24px;
}

.nav-links a {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  color: var(--text-secondary);
  font-size: 0.8125rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  position: relative;
  transition: color 200ms ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--primary);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform 300ms var(--ease-out-expo);
}

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

.nav-links a:hover::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-links a:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
  border-radius: 2px;
}

/* Section 7: Footer
   ========================================================================== */

.site-footer {
  max-width: var(--content-width);
  margin: 0 auto;
  padding: 48px 1.5rem;
  border-top: none;
  text-align: center;
  color: var(--text-tertiary);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.75rem;
}

/* Section 8: Blog content prose
   ========================================================================== */

.blog-content h1 {
  font-family: "Newsreader", "Georgia", serif;
  font-size: 2rem;
  font-weight: 500;
  font-style: italic;
  color: var(--primary);
  margin: 1.5em 0 0.5em;
  line-height: 1.3;
  overflow-wrap: break-word;
}

.blog-content h2 {
  font-family: "Newsreader", "Georgia", serif;
  font-size: 1.625rem;
  font-weight: 500;
  font-style: italic;
  color: var(--secondary);
  margin: 2em 0 0.75em;
  line-height: 1.3;
  overflow-wrap: break-word;
}

.blog-content h3 {
  font-family: "Newsreader", "Georgia", serif;
  font-size: 1.3125rem;
  font-weight: 500;
  color: var(--azure);
  margin: 1.75em 0 0.5em;
  line-height: 1.3;
  overflow-wrap: break-word;
}

.blog-content h4 {
  font-size: 1.125rem;
  color: var(--text);
  margin: 1.25em 0 0.5em;
  line-height: 1.3;
}

.blog-content h5 {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.8125rem;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin: 1em 0 0.5em;
  line-height: 1.3;
}

.blog-content p {
  margin: 1em 0;
  line-height: 1.85;
}

.blog-content a {
  color: var(--azure);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
  text-decoration-color: rgba(98, 144, 200, 0.3);
  transition: text-decoration-color 200ms ease;
}

.blog-content a:hover {
  text-decoration-color: var(--azure);
  color: var(--azure);
}

.blog-content code:not(pre code) {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  background: var(--base-200);
  padding: 0.125em 0.375em;
  border-radius: 0.25rem;
  font-size: 0.875em;
}

.blog-content pre {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  background: var(--base-200);
  padding: 1em;
  overflow-x: auto;
  border-radius: 0.125rem;
  margin: 1em 0;
  border: 1px solid var(--base-300);
}

.blog-content ul {
  list-style: disc;
  padding-left: 1.5em;
  margin: 0.75em 0;
}

.blog-content ol {
  list-style: decimal;
  padding-left: 1.5em;
  margin: 0.75em 0;
}

.blog-content li {
  margin: 0.25em 0;
  line-height: 1.85;
}

.blog-content blockquote {
  margin: 32px 0;
  padding: 24px 28px;
  background: var(--base-200);
  border-left: 2px solid var(--primary);
  border-radius: 0 4px 4px 0;
  font-style: italic;
  color: rgba(234, 242, 239, 0.8);
}

.blog-content blockquote p {
  margin: 0.5em 0;
}

.blog-content img {
  max-width: 100%;
  border-radius: 2px;
  transition: transform 500ms var(--ease-out-expo);
}

.blog-content img:hover {
  transform: scale(1.02);
}

.blog-content img.about-photo {
  width: 280px;
  border-radius: 6px;
  margin-bottom: 1.5rem;
  transition: none;
}

.blog-content img.about-photo:hover {
  transform: none;
}

.blog-content hr {
  border: none;
  border-top: 1px solid var(--base-300);
  margin: 2em 0;
}

/* Section 9: Doc header metadata grid
   ========================================================================== */

.doc-header {
  border-bottom: 1px solid var(--base-300);
  padding-bottom: 1.5rem;
  margin-bottom: 2rem;
}

.doc-header h1 {
  font-family: "Newsreader", "Georgia", serif;
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 20px;
  margin-left: -0.03em;
}

.doc-header dl {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.25rem 1.5rem;
  margin: 0;
  font-family: "IBM Plex Mono", ui-monospace, monospace;
}

.doc-header dt {
  color: var(--text-tertiary);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
}

.doc-header dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.doc-header dd a {
  text-decoration: none;
}

/* Section 10: Data table blog listing
   ========================================================================== */

/* Section header */
.content-wrap > h1 {
  font-family: "Newsreader", "Georgia", serif;
  font-size: clamp(2.25rem, 1.5rem + 3vw, 3.5rem);
  font-weight: 400;
  font-style: italic;
  line-height: 1.15;
  color: var(--text);
  margin-bottom: 24px;
  margin-left: -0.03em;
}

/* Mobile-first: stacked cards */

.data-table-header {
  display: none;
}

.data-table-row {
  display: block;
  border: 1px solid var(--base-300);
  border-left: 2px solid var(--primary);
  padding: 1rem 1.5rem;
  border-radius: 4px;
  text-decoration: none;
  color: inherit;
  margin-bottom: 0.75rem;
  transition: background 200ms var(--ease-out-expo), border-color 200ms var(--ease-out-expo);
}

.data-table-row:hover {
  background: var(--hover-surface);
  border-color: var(--hover-border);
  border-left-color: var(--primary);
}

.data-table-row:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 4px;
  border-radius: 4px;
}

.data-table-row .row-title {
  font-family: "Newsreader", "Georgia", serif;
  font-weight: 500;
  font-size: 1.25rem;
  transition: color 200ms var(--ease-out-expo);
}

.data-table-row:hover .row-title {
  color: var(--primary);
}

.data-table-row .row-meta {
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  margin-top: 0.25rem;
  font-variant-numeric: tabular-nums;
}

.data-table-row .row-desc {
  font-size: 1rem;
  color: var(--text-secondary);
  margin-top: 0.5rem;
  line-height: 1.7;
}

.empty-state {
  padding: 3rem 1.5rem;
  text-align: center;
  color: var(--text-secondary);
  font-style: italic;
}

.data-table-row .row-date {
  display: none;
}

.data-table-row .row-tags {
  display: none;
}

/* Desktop: grid layout */

@media (min-width: 768px) {
  .data-table-header {
    display: grid;
    grid-template-columns: 7.5rem 1fr;
    gap: 1.5rem;
    padding: 0 1.5rem 0.75rem;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.15em;
    border-bottom: 1px solid var(--base-300);
    margin-bottom: 0.5rem;
  }

  .data-table-row {
    display: grid;
    grid-template-columns: 7.5rem 1fr;
    grid-template-rows: auto auto auto;
    gap: 0 1.5rem;
    align-items: baseline;
    border: none;
    border-left: 2px solid transparent;
    border-bottom: 1px solid var(--row-border);
    border-radius: 0;
    padding: 0.75rem 1.5rem;
    margin-bottom: 0;
  }

  .data-table-row:hover {
    border-left-color: var(--primary);
    background: var(--hover-surface);
    border-color: var(--hover-surface);
    border-left-color: var(--primary);
  }

  .data-table-row .row-date {
    display: block;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    grid-row: 1;
    font-variant-numeric: tabular-nums;
  }

  .data-table-row .row-title {
    grid-row: 1;
    grid-column: 2;
  }

  .data-table-row .row-tags {
    display: block;
    grid-row: 3;
    grid-column: 2;
    font-family: "IBM Plex Mono", ui-monospace, monospace;
    font-size: 0.75rem;
    color: var(--text-tertiary);
    text-transform: uppercase;
    letter-spacing: 0.12em;
    margin-top: 0.25rem;
  }

  .data-table-row .row-desc {
    grid-row: 2;
    grid-column: 2;
    margin-top: 0.125rem;
  }

  .data-table-row .row-meta {
    display: none;
  }
}

/* Section 11: Tag pages
   ========================================================================== */

.tag-posts {
  display: flex;
  flex-direction: column;
}

.tag-list {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.tag-list a {
  color: var(--primary);
  font-size: 1rem;
  text-decoration: none;
  position: relative;
  transition: color 200ms ease;
}

.tag-list a:hover {
  color: var(--secondary);
}

/* Section 12: Homepage filmstrip marquee
   ========================================================================== */

.filmstrip-wrap {
  width: 100vw;
  margin-left: calc(-50vw + 50%);
  margin-top: 1rem;
  margin-bottom: 4rem;
  position: relative;
  overflow: hidden;
}

.filmstrip-fade-left,
.filmstrip-fade-right {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 80px;
  z-index: 2;
  pointer-events: none;
}

.filmstrip-fade-left {
  left: 0;
  background: linear-gradient(to right, var(--base-100), transparent);
}

.filmstrip-fade-right {
  right: 0;
  background: linear-gradient(to left, var(--base-100), transparent);
}

.marquee-track {
  display: flex;
  gap: 12px;
  width: max-content;
  animation: marquee-scroll 80s linear infinite;
  animation-play-state: paused;
}

.marquee-track.playing {
  animation-play-state: running;
}

.marquee-play-btn {
  position: absolute;
  bottom: 12px;
  right: 24px;
  z-index: 3;
  background: none;
  border: 1px solid var(--base-300);
  color: var(--text-tertiary);
  font-family: "IBM Plex Mono", ui-monospace, monospace;
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  cursor: pointer;
  border-radius: 2px;
  transition: color 200ms ease, border-color 200ms ease;
}

.marquee-play-btn:hover {
  color: var(--text);
  border-color: var(--text-secondary);
}

.marquee-play-btn:focus-visible {
  outline: 2px solid var(--primary);
  outline-offset: 2px;
}

@keyframes marquee-scroll {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); }
}

.marquee-track .img-item {
  height: 55vh;
  flex-shrink: 0;
  border: 1px solid var(--base-300);
  overflow: hidden;
  border-radius: 1px;
}

.marquee-track .img-item img {
  height: 100%;
  width: auto;
  display: block;
  transition: opacity 0.5s var(--ease-out-expo);
}

.marquee-track:hover .img-item img {
  opacity: 0.4;
}

.marquee-track .img-item:hover img {
  opacity: 1;
}

/* Section 13: Banner image
   ========================================================================== */

.banner-img {
  width: 100%;
  border-radius: 2px;
  margin-bottom: 1.5rem;
  transition: transform 600ms var(--ease-out-expo);
}

.banner-img:hover {
  transform: scale(1.02);
}

/* Section 13: Scroll reveal animations
   ========================================================================== */

[data-reveal] {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 600ms var(--ease-out-expo),
              transform 600ms var(--ease-out-expo);
}

[data-reveal].visible {
  opacity: 1;
  transform: translateY(0);
}

/* Section 14: Reduced motion
   ========================================================================== */

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] {
    opacity: 1;
    transform: none;
  }
  html {
    scroll-behavior: auto;
  }
}

/* Section 15: Responsive
   ========================================================================== */

@media (max-width: 640px) {
  .site-nav { padding: 16px 20px; }
  .site-nav.scrolled { padding: 12px 20px; }
  .nav-links { gap: 16px; }
  .content-wrap { padding: 1.5rem 1.25rem; }
  /* Homepage hero: tighten for mobile viewport fit */
  .content-wrap > .blog-content {
    padding: 0.75rem 0 1rem;
  }

  .content-wrap > .blog-content h1 {
    font-size: 1.75rem;
    margin: 0.5em 0 0.25em;
  }

  .content-wrap > .blog-content p {
    font-size: 1rem;
    margin: 0.5em 0;
  }

  /* Filmstrip: swipeable horizontal scroll on mobile */
  .filmstrip-wrap {
    width: auto;
    margin-left: 0;
    margin-top: 0;
    margin-bottom: 0.75rem;
    overflow: visible;
  }

  .filmstrip-fade-left,
  .filmstrip-fade-right { display: none; }

  .marquee-play-btn { display: none; }

  .marquee-track {
    animation: none;
    width: auto;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    gap: 0;
  }

  .marquee-track::-webkit-scrollbar { display: none; }

  .marquee-track .img-item {
    min-width: 100vw;
    height: auto;
    scroll-snap-align: center;
    border: none;
    display: flex;
    justify-content: center;
    padding: 0 1rem;
  }

  .marquee-track .img-item.duplicate { display: none; }

  .marquee-track .img-item img {
    width: 100%;
    max-height: 55vh;
    aspect-ratio: 3 / 4;
    object-fit: cover;
    border-radius: 2px;
  }

  .site-footer { padding: 12px 1.25rem; }
}