:root {
  --color-site: #119bda;
  --color-background: #000000;
  --color-text-primary: #e8eef4;
  --color-text-secondary: #9fb0c0;
  --color-muted: #6f8294;
  --color-aurora-purple: #a855f7;
  --color-aurora-blue: #3b82f6;
  --color-surface-soft: rgba(255, 255, 255, 0.035);
  --color-border-soft: rgba(255, 255, 255, 0.08);
  --color-border-active: rgba(17, 155, 218, 0.55);
  --header-height: 74px;
  --container-width: 1180px;
  --transition: 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 110px;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Vazirmatn", sans-serif;
  background: var(--color-background);
  color: var(--color-text-primary);
  overflow-x: hidden;
}

body.toc-is-open {
  overflow: hidden;
}

a {
  color: inherit;
  text-decoration: none;
}

img {
  max-width: 100%;
}

button {
  font: inherit;
}

::selection {
  background: rgba(17, 155, 218, 0.28);
  color: #ffffff;
}

/* Aurora Background */

.aurora-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.aurora-bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 0%, rgba(17, 155, 218, 0.12), transparent 38%),
    linear-gradient(to bottom, transparent, rgba(0, 0, 0, 0.92) 72%);
}

.aurora-effect {
  position: absolute;
  width: 780px;
  height: 780px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--color-aurora-purple) 0%, transparent 68%);
  filter: blur(86px);
  opacity: 0.38;
  animation: aurora-float 16s ease-in-out infinite;
}

.aurora-2 {
  background: radial-gradient(circle, var(--color-aurora-blue) 0%, transparent 68%);
  animation: aurora-float-2 13s ease-in-out infinite;
  animation-delay: -5s;
}

@keyframes aurora-float {
  0%, 100% {
    transform: translate(-22%, -24%) scale(1);
    opacity: 0.36;
  }

  35% {
    transform: translate(22%, 18%) scale(1.08);
    opacity: 0.45;
  }

  70% {
    transform: translate(46%, -8%) scale(0.92);
    opacity: 0.28;
  }
}

@keyframes aurora-float-2 {
  0%, 100% {
    transform: translate(62vw, 44vh) scale(0.92);
    opacity: 0.3;
  }

  40% {
    transform: translate(36vw, -16vh) scale(1.12);
    opacity: 0.42;
  }

  75% {
    transform: translate(74vw, 26vh) scale(1);
    opacity: 0.48;
  }
}

/* Masked Icons */

.masked-icon {
  display: inline-block;
  width: 20px;
  height: 20px;
  flex: 0 0 auto;
  background: currentColor;
  -webkit-mask-position: center;
  mask-position: center;
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
}

.icon-arrow-right {
  -webkit-mask-image: url("assets/icons/arrow-right.svg");
  mask-image: url("assets/icons/arrow-right.svg");
}

.icon-list {
  -webkit-mask-image: url("assets/icons/list.svg");
  mask-image: url("assets/icons/list.svg");
}

.icon-close {
  -webkit-mask-image: url("assets/icons/close.svg");
  mask-image: url("assets/icons/close.svg");
}

.icon-python {
  -webkit-mask-image: url("assets/icons/python.svg");
  mask-image: url("assets/icons/python.svg");
}

.icon-cpu {
  -webkit-mask-image: url("assets/icons/cpu.svg");
  mask-image: url("assets/icons/cpu.svg");
}

.icon-vm {
  -webkit-mask-image: url("assets/icons/vm.svg");
  mask-image: url("assets/icons/vm.svg");
}

.icon-speed {
  -webkit-mask-image: url("assets/icons/speed.svg");
  mask-image: url("assets/icons/speed.svg");
}

.icon-code {
  -webkit-mask-image: url("assets/icons/code.svg");
  mask-image: url("assets/icons/code.svg");
}

.icon-layers {
  -webkit-mask-image: url("assets/icons/layers.svg");
  mask-image: url("assets/icons/layers.svg");
}

/* Header */

.article-header {
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 14px 18px;
  padding-bottom: 0;
  backdrop-filter: blur(14px);
}

.article-header__inner {
  width: min(var(--container-width), 100%);
  min-height: var(--header-height);
  margin: 0 auto;
  padding: 0 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid var(--color-border-soft);
}

.site-brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-width: 0;
}

.site-brand__logo {
  width: 42px;
  height: 42px;
  object-fit: contain;
}

.site-brand__name {
  font-size: 1rem;
  font-weight: 800;
  white-space: nowrap;
}

.article-header__actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.back-btn,
.toc-open-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 15px;
  border: 0;
  border-radius: 999px;
  color: var(--color-text-primary);
  background: transparent;
  cursor: pointer;
  transition:
    color var(--transition),
    transform var(--transition);
}

.back-btn:hover,
.toc-open-btn:hover {
  color: var(--color-site);
  transform: translateY(-2px);
}

.toc-open-btn {
  display: none;
}

/* Main Layout */

.article-shell {
  width: min(var(--container-width), calc(100% - 32px));
  margin: 0 auto;
  padding: 58px 0 120px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 260px;
  gap: 56px;
  align-items: start;
}

.article-content {
  min-width: 0;
}

.desktop-toc {
  order: 2;
}

.article-content {
  order: 1;
}

.desktop-toc__sticky {
  position: fixed;
  top: 112px;
  padding-right: 18px;
  border-right: 1px solid var(--color-border-soft);
}

.desktop-toc__title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--color-text-primary);
  font-weight: 800;
}

.toc-nav {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.toc-nav a {
  position: relative;
  display: block;
  padding: 9px 0;
  color: var(--color-muted);
  font-size: 0.9rem;
  line-height: 1.7;
  transition:
    color var(--transition),
    transform var(--transition);
}

.toc-nav a:hover,
.toc-nav a.is-active {
  color: var(--color-site);
  transform: translateX(-4px);
}

/* Hero */

.hero {
  min-height: 430px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-bottom: 56px;
}

.hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  width: fit-content;
  color: var(--color-site);
  font-size: 0.95rem;
  font-weight: 800;
  margin-bottom: 18px;
}

.hero h1 {
  max-width: 860px;
  margin: 0;
  font-size: clamp(2.1rem, 6vw, 4.8rem);
  line-height: 1.25;
  letter-spacing: -0.05em;
}

.hero__description {
  max-width: 760px;
  margin: 24px 0 0;
  color: var(--color-text-secondary);
  font-size: 1.08rem;
  line-height: 2.15;
}

.hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: 28px;
  color: var(--color-muted);
  font-size: 0.88rem;
}

/* Article Typography */

.article-section,
.vm-section {
  padding: 54px 0;
  border-top: 1px solid var(--color-border-soft);
}

.article-section:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.section-heading {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 18px;
  color: var(--color-site);
}

.section-heading .masked-icon {
  width: 26px;
  height: 26px;
  margin-top: 8px;
}

h2,
h3 {
  color: var(--color-text-primary);
}

.section-heading h2,
.vm-section__header h2 {
  margin: 0;
  font-size: clamp(1.45rem, 3vw, 2.2rem);
  line-height: 1.55;
  letter-spacing: -0.03em;
}

h3 {
  margin: 26px 0 10px;
  font-size: 1.08rem;
  color: var(--color-site);
}

p {
  margin: 0 0 18px;
  color: var(--color-text-secondary);
  font-size: 1.02rem;
  line-height: 2.15;
}

strong {
  color: var(--color-text-primary);
}

.latin {
  direction: ltr;
  unicode-bidi: plaintext;
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  color: var(--color-text-primary);
}

/* Content Blocks */

.note {
  margin: 28px 0;
  padding: 20px 24px;
  border-right: 3px solid var(--color-site);
  background: linear-gradient(to left, rgba(17, 155, 218, 0.08), transparent 72%);
}

.note p:last-child {
  margin-bottom: 0;
}

.code-flow {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0;
  color: var(--color-text-primary);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
}

.code-flow span {
  position: relative;
  padding: 10px 14px;
  border-radius: 999px;
  background: var(--color-surface-soft);
  color: var(--color-text-primary);
  font-size: 0.9rem;
}

.code-flow span:not(:last-child)::after {
  content: "→";
  margin-left: -2px;
  margin-right: 10px;
  color: var(--color-site);
}

.vm-section__header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 20px;
}

.vm-number {
  direction: ltr;
  color: var(--color-site);
  font-size: 0.92rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.split-block {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 34px;
  margin: 26px 0;
}

.clean-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 20px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.clean-list li {
  position: relative;
  padding-right: 18px;
  color: var(--color-text-secondary);
  line-height: 1.9;
}

.clean-list li::before {
  content: "";
  position: absolute;
  top: 14px;
  right: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-site);
}

.summary-section {
  padding-bottom: 0;
}

.summary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 26px;
  margin: 28px 0 32px;
}

.summary-grid div {
  padding: 0 18px 0 0;
  border-right: 2px solid var(--color-border-active);
}

.summary-grid strong {
  display: block;
  margin-bottom: 6px;
  color: var(--color-site);
  font-size: 1rem;
}

.summary-grid span {
  display: block;
  color: var(--color-text-secondary);
  line-height: 1.85;
}

/* Mobile TOC */

.mobile-toc-backdrop {
  position: fixed;
  inset: 0;
  z-index: 29;
  background: rgba(0, 0, 0, 0.55);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition);
}

.mobile-toc {
  position: fixed;
  top: 0;
  right: 0;
  z-index: 30;
  width: min(360px, 88vw);
  height: 100dvh;
  padding: 22px;
  background: rgba(5, 10, 15, 0.94);
  backdrop-filter: blur(18px);
  border-left: 1px solid var(--color-border-soft);
  transform: translateX(102%);
  transition: transform var(--transition);
}

.mobile-toc.is-open {
  transform: translateX(0);
}

.mobile-toc-backdrop.is-open {
  opacity: 1;
  pointer-events: auto;
}

.mobile-toc__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 16px;
  margin-bottom: 10px;
  border-bottom: 1px solid var(--color-border-soft);
}

.mobile-toc__close {
  width: 42px;
  height: 42px;
  display: inline-grid;
  place-items: center;
  border: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--color-text-primary);
  cursor: pointer;
}

.mobile-toc__nav {
  max-height: calc(100dvh - 100px);
  overflow-y: auto;
  padding-left: 4px;
}

/* Responsive */

@media (max-width: 980px) {
  .article-shell {
    display: block;
    width: min(820px, calc(100% - 28px));
    padding-top: 36px;
  }

  .desktop-toc {
    display: none;
  }

  .toc-open-btn {
    display: inline-flex;
  }

  .hero {
    min-height: auto;
    padding: 52px 0 46px;
  }
}

@media (max-width: 720px) {
  .article-header {
    padding: 10px 12px;
  }

  .article-header__inner {
    min-height: 62px;
    padding: 0 4px;
  }

  .site-brand__name {
    display: none;
  }

  .back-btn,
  .toc-open-btn {
    min-height: 40px;
    padding: 0 10px;
    font-size: 0.88rem;
  }

  .article-shell {
    width: min(100% - 24px, 820px);
    padding-bottom: 80px;
  }

  .hero h1 {
    font-size: clamp(2rem, 11vw, 3.2rem);
  }

  .hero__description,
  p {
    font-size: 0.98rem;
    line-height: 2.05;
  }

  .article-section,
  .vm-section {
    padding: 42px 0;
  }

  .split-block,
  .summary-grid,
  .clean-list {
    grid-template-columns: 1fr;
  }

  .code-flow {
    align-items: flex-start;
    flex-direction: column;
  }

  .code-flow span:not(:last-child)::after {
    content: "↓";
    margin-left: 0;
    margin-right: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}