/* ==========================================================================
   Z-INDEX LAYERS
   0   - Canvas background
   100 - Page content (cards / homepage hero)
   200 - Chrome (nav, footer, controls)
   210 - Dropdowns (lang menu)
   9999 - Custom cursor
   ========================================================================== */

* { margin: 0; padding: 0; }

:root {
  --mono-font: 'Space Mono', 'SFMono-Regular', ui-monospace, monospace;
  --serif-font: 'Source Serif 4', Georgia, serif;
  --viewport-height: 100vh;
  --chrome-inset: 75px;
}

@supports (height: 100dvh) {
  :root {
    --viewport-height: 100dvh;
  }
}

html {
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}

html:has(.homepage-hero),
html:has(.content-overlay) {
  overflow: hidden;
}

html::-webkit-scrollbar { width: 6px; }
html::-webkit-scrollbar-track { background: transparent; }
html::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
html::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

html, body {
  background: #1a1a1a;
}

body:has(.content-overlay),
body:has(.homepage-hero) {
  overflow: hidden;
}

::selection {
  background: rgba(255, 255, 255, 0.25);
  color: #fff;
}

*, *::before, *::after { cursor: none !important; }

/* ==========================================================================
   Custom Cursor
   ========================================================================== */

.cursor-ring {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  width: 40px; height: 40px;
  border: 1.5px solid rgba(255,255,255,0.6);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s, border-color 0.3s, opacity 0.3s;
  mix-blend-mode: difference;
}

.cursor-ring.is-clicking {
  width: 56px; height: 56px;
  border-color: rgba(255,255,255,0.9);
}

.cursor-dot {
  position: fixed;
  z-index: 9999;
  pointer-events: none;
  width: 5px; height: 5px;
  background: #fff;
  border-radius: 50%;
  transform: translate(-50%, -50%);
  mix-blend-mode: difference;
}

.touch-device .cursor-dot,
.touch-device .cursor-ring {
  display: none !important;
}

.touch-device *, .touch-device *::before, .touch-device *::after {
  cursor: auto !important;
}

/* ==========================================================================
   LAYER 0: Canvas Background
   ========================================================================== */

canvas {
  display: block;
  width: 100vw;
  height: var(--viewport-height);
  position: fixed;
  top: 0;
  left: 0;
  z-index: 0;
  image-rendering: auto;
  opacity: 0;
  transition: opacity 1000ms ease;
}

canvas.shader-ready {
  opacity: 1;
}

/* ==========================================================================
   LAYER 100: Page Content
   ========================================================================== */

.page {
  position: relative;
  z-index: 100;
}

.page:has(.content-overlay) {
  position: static;
}

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

body:has(.homepage-hero) .page {
  pointer-events: none;
}

.homepage-hero {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  height: 100vh;
  height: var(--viewport-height);
  color: #fff;
  text-align: center;
}

@keyframes breathe {
  0%, 100% { opacity: 0.6; }
  50%      { opacity: 1; }
}

.homepage-hero h1 {
  font: 3.6rem/1 var(--mono-font);
  letter-spacing: 0.3em;
  text-transform: uppercase;
  text-shadow: 0 0 40px rgba(0,0,0,0.8);
  animation: breathe 4s ease-in-out infinite;
}

.homepage-hero p {
  margin-top: 1rem;
  font: 1.2rem/1.5 var(--mono-font);
  opacity: 0.7;
}

.hero-flag {
  display: inline-block;
  vertical-align: middle;
  width: 20px;
  height: auto;
  margin-left: 6px;
  opacity: 0.7;
}

/* --- Floating content card --- */

.content-overlay {
  position: fixed;
  top: calc(var(--chrome-inset) + 30px);
  bottom: calc(var(--chrome-inset) + 30px);
  left: 0;
  right: 0;
  display: flex;
  justify-content: center;
  z-index: 100;
  pointer-events: none;
}

.content-card {
  position: relative;
  width: 100%;
  max-width: 820px;
  margin: 0 var(--chrome-inset);
  background: rgba(0, 0, 0, 0.72);
  backdrop-filter: blur(12px);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 4px;
  padding: 48px 52px 56px;
  color: rgba(255, 255, 255, 0.88);
  font: 19px/1.7 var(--serif-font);
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.4);
  overflow-y: auto;
  pointer-events: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(255,255,255,0.15) transparent;
}

.content-card::-webkit-scrollbar { width: 5px; }
.content-card::-webkit-scrollbar-track { background: transparent; }
.content-card::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.15); border-radius: 3px; }
.content-card::-webkit-scrollbar-thumb:hover { background: rgba(255,255,255,0.3); }

.close-btn {
  position: absolute;
  top: 16px;
  right: 20px;
  font-size: 26px;
  line-height: 1;
  color: rgba(255, 255, 255, 0.35);
  text-decoration: none;
  transition: color 0.2s;
}

.close-btn:hover {
  color: #fff;
}

.content-card h1 {
  font: 2.4rem/1.2 var(--mono-font);
  letter-spacing: 0.05em;
  margin-bottom: 1.5rem;
  color: #fff;
}

.content-card h2 {
  font: 1.7rem/1.3 var(--mono-font);
  letter-spacing: 0.03em;
  margin: 2rem 0 1rem;
  color: #fff;
}

.content-card p {
  margin-bottom: 1.2em;
}

.content-card a {
  color: rgba(255, 255, 255, 0.95);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 0.2s;
}

.content-card a:hover {
  color: #fff;
}

.content-card ul,
.content-card ol {
  margin: 1em 0;
  padding-left: 0;
  list-style-position: inside;
}

.content-card li {
  margin-bottom: 0.2em;
}

.content-card li p {
  margin-bottom: 0;
}

.content-card em, .content-card i {
  font-style: italic;
}

.content-card code {
  font-family: var(--mono-font);
  font-size: 0.9em;
}

.content-card pre {
  margin: 1.5em 0;
  padding: 1em 1.2em;
  background: rgba(0, 0, 0, 0.3);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 3px;
  overflow-x: auto;
}

.content-card pre code {
  font-size: 16px;
  line-height: 1.5;
}

/* Tables */
.content-card table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5em 0;
  font: 17px/1.5 var(--mono-font);
}

.content-card th,
.content-card td {
  padding: 8px 12px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.content-card th {
  font-weight: 700;
  color: #fff;
  border-bottom-color: rgba(255, 255, 255, 0.25);
}

/* Blockquotes */
.content-card blockquote {
  margin: 1.5em 0;
  padding: 0.8em 1.2em;
  border-left: 2px solid rgba(255, 255, 255, 0.25);
  color: rgba(255, 255, 255, 0.7);
  font-style: italic;
}

.content-card blockquote p {
  margin-bottom: 0;
}

/* Definition lists */
.content-card dt {
  font: 17px/1.5 var(--mono-font);
  font-weight: 700;
  color: #fff;
  margin-top: 1em;
}

.content-card dd {
  margin: 0.3em 0 0 1.5em;
  color: rgba(255, 255, 255, 0.8);
}

/* Footnotes */
.content-card .footnote {
  margin-top: 1em;
  padding-top: 0;
  border-top: none;
  font-size: 14px;
  opacity: 0.6;
}

.content-card .footnote hr {
  display: none;
}

.content-card .footnote ol {
  padding-left: 1.5em;
  list-style-position: outside;
}

.content-card .footnote li {
  margin-bottom: 0.3em;
}

.content-card .footnote + .content-sig {
  border-top: none;
  margin-top: 1.5rem;
}

/* Abbreviations */
.content-card abbr[data-tip] {
  text-decoration: underline dotted rgba(255, 255, 255, 0.4);
  text-underline-offset: 3px;
  position: relative;
}

.content-card abbr[data-tip]:hover::after {
  content: attr(data-tip);
  position: absolute;
  top: 100%;
  left: 0;
  padding: 4px 10px;
  background: rgba(20, 20, 20, 0.95);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 3px;
  font: 14px/1.4 var(--mono-font);
  font-style: normal;
  color: rgba(255, 255, 255, 0.85);
  white-space: nowrap;
  margin-top: 4px;
  pointer-events: none;
  z-index: 10;
}

/* Horizontal rules */
.content-card hr {
  border: none;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  margin: 2em 0;
}

.content-card strong, .content-card b {
  font-weight: 700;
}


/* Content signature (shared between card and fullpage) */
.content-sig {
  margin-top: 3rem;
  margin-bottom: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font: 14px/1.5 var(--mono-font);
  color: rgba(255, 255, 255, 0.4);
  font-style: italic;
}

/* Blog post specific */
.post-header {
  margin-bottom: 2rem;
}

.post-header h1 {
  margin-bottom: 0.5rem;
}

.post-meta {
  font: 17px/1.5 var(--mono-font);
  opacity: 0.6;
}

.post-body {
  font: 17px/1.7 var(--serif-font);
}


.post-body li {
  margin-bottom: 0.1em;
}

.post-body li p {
  margin-bottom: 0;
}

.post-body p {
  margin-bottom: 1.2em;
}

.back-link {
  display: inline-block;
  margin-top: 3rem;
  font: 17px/1 var(--mono-font);
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  transition: color 0.2s;
}

.back-link:hover {
  color: #fff;
}

.post-nav {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-top: 0;
  margin-bottom: -28px;
  padding-top: 0;
  font: 13px/1.4 var(--mono-font);
  gap: 1rem;
}

.post-nav a {
  color: rgba(255, 255, 255, 0.3);
  text-decoration: none;
  transition: color 0.2s;
}

.post-nav a:hover {
  color: rgba(255, 255, 255, 0.7);
}

.post-nav-prev,
.post-nav-next {
  flex: 1;
  min-width: 0;
}

.post-nav-prev a,
.post-nav-next a {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.post-nav-back {
  flex-shrink: 0;
}

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

/* Project list */
.project-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.project-list li {
  margin-bottom: 1.2rem;
}

.project-list a {
  display: flex;
  align-items: baseline;
  gap: 0.8em;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.9);
  transition: color 0.2s;
}

.project-list a:hover {
  color: #fff;
}

.project-name {
  font: 17px/1.3 var(--mono-font);
  font-weight: 700;
}

.project-lang {
  font: 13px/1 var(--mono-font);
  opacity: 0.4;
  text-transform: uppercase;
}

.project-desc {
  margin: 0.3em 0 0;
  font: 16px/1.5 var(--serif-font);
  opacity: 0.6;
}

.project-footnote {
  margin-top: 2rem;
  font: 14px/1.5 var(--mono-font);
  opacity: 0.4;
}

/* Blog index list */
.blog-list {
  list-style: none;
  padding: 0;
  margin: 2rem 0;
}

.blog-list li {
  margin-bottom: 1rem;
  padding: 0;
}

.blog-list a {
  display: block;
  text-decoration: none;
  color: rgba(255, 255, 255, 0.9);
  transition: color 0.2s;
}

.blog-list a:hover {
  color: #fff;
}

.blog-list .post-date {
  font: 16px/1 var(--mono-font);
  opacity: 0.5;
  display: block;
  margin-bottom: 0.3em;
}

.blog-list .post-title {
  font: 22px/1.3 var(--serif-font);
  font-style: italic;
}

/* ==========================================================================
   LAYER 200: Chrome — always in corners
   ========================================================================== */

#fps {
  position: fixed;
  top: 10px;
  left: 10px;
  color: white;
  font: 19px var(--mono-font);
  background: rgba(0,0,0,0.5);
  padding: 5px 10px;
  z-index: 200;
  display: none;
}

#fps.visible {
  display: block;
}

.top-nav {
  position: fixed;
  top: var(--chrome-inset);
  right: var(--chrome-inset);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 20px;
}

.nav-link {
  font: 17px/1 var(--mono-font);
  text-transform: uppercase;
  letter-spacing: 0;
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  padding: 2px 5px;
  transition: color 0.2s ease, background 0.2s ease;
}

.nav-link:hover,
.nav-link.active {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

#site-footer {
  position: fixed;
  bottom: var(--chrome-inset);
  left: var(--chrome-inset);
  z-index: 200;
  color: rgba(255, 255, 255, 0.7);
  font: 17px/1 var(--mono-font);
  padding: 6px 10px;
  transition: color 0.2s, background 0.2s;
}

#site-footer:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

#site-footer a {
  color: inherit;
  text-decoration: none;
}

.colophon {
  display: inline-block;
  max-width: 0;
  overflow: hidden;
  white-space: nowrap;
  vertical-align: bottom;
  opacity: 0;
  transition: max-width 0.3s ease, opacity 0.3s ease;
}

#site-footer:hover .colophon {
  max-width: 6em;
  opacity: 0.7;
}

.bottom-controls {
  position: fixed;
  bottom: var(--chrome-inset);
  right: var(--chrome-inset);
  z-index: 200;
  display: flex;
  align-items: center;
  gap: 16px;
}

#theme-toggle {
  border: 0;
  background: none;
  color: rgba(255, 255, 255, 0.7);
  font: 17px/1 var(--mono-font);
  padding: 6px 10px;
  transition: color 0.2s ease;
}

#theme-toggle:hover {
  color: #fff;
}

#theme-toggle .value {
  margin-inline-start: 0.15em;
}

.lang-picker {
  position: relative;
  z-index: 220;
  pointer-events: auto;
}

#lang-toggle {
  border: 0;
  background: none;
  color: rgba(255, 255, 255, 0.7);
  font: 17px/1 var(--mono-font);
  padding: 6px 10px;
  transition: color 0.2s ease;
  position: relative;
  z-index: 221;
  pointer-events: auto;
}

#lang-toggle:hover {
  color: #fff;
}

/* ==========================================================================
   LAYER 210: Dropdowns
   ========================================================================== */

.lang-menu {
  position: absolute;
  bottom: 100%;
  right: 0;
  margin-bottom: 8px;
  z-index: 230;
  background: rgba(30, 30, 30, 0.95);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 4px;
  list-style: none;
  padding: 6px 0;
  min-width: 160px;
  max-height: 320px;
  overflow-y: auto;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  opacity: 0;
  transform: translateY(8px);
  transition: opacity 0.2s ease, transform 0.2s ease;
  pointer-events: none;
}

.lang-menu:not([hidden]) {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

.lang-menu::-webkit-scrollbar { width: 6px; }
.lang-menu::-webkit-scrollbar-track { background: transparent; }
.lang-menu::-webkit-scrollbar-thumb { background: rgba(255, 255, 255, 0.2); border-radius: 3px; }

.lang-menu li { padding: 0; margin: 0; }

.lang-menu button {
  width: 100%;
  border: 0;
  background: none;
  color: rgba(255, 255, 255, 0.8);
  font: 16px/1.4 var(--mono-font);
  padding: 8px 16px;
  text-align: start;
  transition: background 0.15s ease, color 0.15s ease;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 1.2em auto;
  align-items: center;
  column-gap: 12px;
}

.lang-menu button:hover {
  background: rgba(255, 255, 255, 0.1);
  color: rgba(255, 255, 255, 1);
}

.lang-menu button[aria-selected="true"] {
  color: rgba(255, 255, 255, 1);
}

.lang-menu .lang-check {
  width: 1.2em;
  text-align: center;
  font-size: 13px;
  opacity: 0;
}

.lang-menu button[aria-selected="true"] .lang-check {
  opacity: 0.7;
}

.lang-menu .lang-code {
  opacity: 0.5;
  font-size: 13px;
  text-transform: uppercase;
}

/* ==========================================================================
   404 Error Page
   ========================================================================== */

.error-text {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  text-align: center;
  font: 18px/1.5 var(--mono-font);
  color: rgba(255, 255, 255, 0.9);
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.5);
  letter-spacing: 0.05em;
  z-index: 100;
  pointer-events: none;
}

/* Hide chrome on 404 */
.error-home {
  display: block;
  margin-top: 2rem;
  font: 29px/1 var(--mono-font);
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  pointer-events: auto;
  opacity: 0;
  transition: opacity 0.8s ease, color 0.2s ease;
}

.error-home.visible {
  opacity: 1;
}

.error-home:hover {
  color: #fff;
}

/* Hide chrome on 404 */
body:has(.page[data-page-type="404"]) .top-nav,
body:has(.page[data-page-type="404"]) #site-footer,
body:has(.page[data-page-type="404"]) .bottom-controls {
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

/* ==========================================================================
   Utility Classes
   ========================================================================== */

.mono-bold { font-weight: 700; }
.mono-light { font-weight: 300; }
.mono-caps { text-transform: uppercase; letter-spacing: 0.12em; }
.mono-spaced { letter-spacing: 0.3em; }

/* ==========================================================================
   Responsive: Medium (< 800px)
   ========================================================================== */

@media (max-width: 800px) {
  :root { --chrome-inset: 40px; }

  .content-card {
    padding: 40px 32px 44px;
  }


  .homepage-hero h1 {
    font-size: 2.6rem;
  }
}

/* ==========================================================================
   Responsive: Small (< 520px)
   ========================================================================== */

@media (max-width: 520px) {
  :root { --chrome-inset: 16px; }

  .top-nav {
    top: var(--chrome-inset);
    right: auto;
    left: 50%;
    transform: translateX(-50%);
    gap: 10px;
  }

  .nav-link {
    font-size: 14px;
  }

  #site-footer {
    bottom: var(--chrome-inset);
    left: var(--chrome-inset);
  }

  .bottom-controls {
    bottom: var(--chrome-inset);
    right: var(--chrome-inset);
  }

  .content-overlay {
    top: calc(var(--chrome-inset) + 30px);
    bottom: calc(var(--chrome-inset) + 28px);
  }

  .content-card {
    margin: 0;
    border-radius: 0;
    border-left: none;
    border-right: none;
    padding: 36px 20px 40px;
  }


  .homepage-hero h1 {
    font-size: 2.2rem;
  }

  .bottom-controls {
    gap: 8px;
  }

  #lang-toggle,
  #theme-toggle {
    padding: 6px 6px;
  }

  .lang-menu {
    min-width: 140px;
  }

  .blog-list .post-title {
    font-size: 19px;
  }
}