/* معرفی چت‌میل و دلتاچت
   توکن‌ها نزدیک رنگ رسمی delta.chat هستند. متن دکمه فیروزه‌ای تیره می‌ماند. */

@font-face {
  font-family: Vazirmatn;
  src: url("../fonts/Vazirmatn-Regular.woff2") format("woff2");
  font-weight: 400;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: Vazirmatn;
  src: url("../fonts/Vazirmatn-Bold.woff2") format("woff2");
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  color-scheme: light;
  --ink: #364e59;
  --ink-2: #415e6b;
  --accent: #7cc5cc;
  --on-accent: #16343a;
  --safe: #1b7a32;
  --safe-bg: #efffde;
  --safe-line: #c6e8b0;
  --bg: #f8f9fa;
  --card: #ffffff;
  --text: #24343b;
  --muted: #5c7078;
  --line: #e3eaed;
  --link: #1a6570;
  --shadow: 0 8px 24px rgba(54, 78, 89, 0.08);
  --radius: 14px;
  --max: 1080px;
  --header: 64px;
  --header-bg: #364e59;
  --code-bg: #eef4f6;
  --code-block: #24343b;
  --code-block-text: #e7f6f7;
  --chip: #ffffff;
  --soft: #f3fbfb;
  --badge: #e7f6f7;
}

html[data-theme="dark"] {
  color-scheme: dark;
  --ink: #d5e6eb;
  --ink-2: #b7c9ce;
  --accent: #7cc5cc;
  --on-accent: #10262b;
  --safe: #9ed68a;
  --safe-bg: #1a3324;
  --safe-line: #2d5a38;
  --bg: #12191d;
  --card: #1c272c;
  --text: #e7eef0;
  --muted: #a9bcc2;
  --line: #314148;
  --link: #8ed4da;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.32);
  --header-bg: #0d1418;
  --code-bg: #243238;
  --code-block: #0d1418;
  --code-block-text: #e7f6f7;
  --chip: #1c272c;
  --soft: #243238;
  --badge: #1a3338;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) {
    color-scheme: dark;
    --ink: #d5e6eb;
    --ink-2: #b7c9ce;
    --accent: #7cc5cc;
    --on-accent: #10262b;
    --safe: #9ed68a;
    --safe-bg: #1a3324;
    --safe-line: #2d5a38;
    --bg: #12191d;
    --card: #1c272c;
    --text: #e7eef0;
    --muted: #a9bcc2;
    --line: #314148;
    --link: #8ed4da;
    --shadow: 0 8px 24px rgba(0, 0, 0, 0.32);
    --header-bg: #0d1418;
    --code-bg: #243238;
    --code-block: #0d1418;
    --code-block-text: #e7f6f7;
    --chip: #1c272c;
    --soft: #243238;
    --badge: #1a3338;
  }
}

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

html {
  scroll-behavior: smooth;
  overflow-x: clip;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Vazirmatn, Tahoma, sans-serif;
  font-size: 1.05rem;
  line-height: 1.85;
  overflow-wrap: break-word;
  padding-left: env(safe-area-inset-left);
  padding-right: env(safe-area-inset-right);
}

img,
svg {
  max-width: 100%;
  height: auto;
}

a {
  color: var(--link);
}

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.skip {
  position: absolute;
  right: 12px;
  top: -48px;
  z-index: 20;
  background: var(--card);
  color: var(--ink);
  padding: 8px 12px;
  border-radius: 8px;
}

.skip:focus {
  top: 12px;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: var(--header-bg);
  color: #fff;
  box-shadow: 0 1px 0 rgba(0, 0, 0, 0.12);
}

.header-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 16px;
  max-width: var(--max);
  margin: 0 auto;
  padding: 10px 20px;
  min-height: var(--header);
}

.brand span {
  min-width: 0;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

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

.logo {
  width: 40px;
  height: 40px;
  flex: none;
  background: #fff;
  border-radius: 10px;
  object-fit: cover;
}

.shot {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: 12px;
  display: block;
}

.nav-toggle {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
}

.nav-btn {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border-radius: 10px;
  cursor: pointer;
}

.nav-btn span:not(.sr-only) {
  display: block;
  height: 2px;
  background: #fff;
  border-radius: 2px;
}

.site-nav {
  display: none;
  width: 100%;
  flex-direction: column;
  gap: 4px;
  padding-bottom: 8px;
}

.nav-toggle:checked ~ .site-nav {
  display: flex;
}

.site-nav a {
  color: #fff;
  text-decoration: none;
  padding: 8px 12px;
  border-radius: 10px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  background: rgba(124, 197, 204, 0.22);
  color: #fff;
}

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 8px 20px 72px;
}

.prose {
  max-width: 740px;
}

.hero {
  padding: 48px 0 12px;
}

.hero h1,
.page-head h1,
h2,
h3 {
  color: var(--ink);
  line-height: 1.45;
}

.hero h1,
.page-head h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 4vw, 2.35rem);
}

.lede {
  margin: 0;
  color: var(--ink-2);
  font-size: 1.15rem;
}

.verse {
  margin: 10px 0 0;
  color: var(--muted);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.hero .actions {
  justify-content: flex-start;
}

.btn {
  display: inline-block;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
  text-decoration: none;
  padding: 11px 16px;
  border-radius: 12px;
  border: 2px solid transparent;
}

.btn:hover {
  color: var(--on-accent);
  background: #8ed0d6;
}

.btn-ghost {
  background: transparent;
  border-color: var(--ink-2);
  color: var(--ink);
}

.btn-ghost:hover {
  background: var(--card);
  color: var(--ink);
}

.btn-small {
  padding: 7px 12px;
  font-size: 0.95rem;
}

section {
  margin: 40px 0;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.4rem;
}

h3 {
  margin: 0 0 6px;
  font-size: 1.12rem;
  color: var(--ink-2);
}

p {
  margin: 0 0 12px;
}

.grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 18px 18px 16px;
  min-width: 0;
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.feature-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 18px;
  min-width: 0;
}

.feature-list li > * {
  min-width: 0;
}

.emo {
  font-size: 1.4rem;
  line-height: 1.4;
  flex: none;
}

.plain-list {
  margin: 0;
  padding: 0 1.2em 0 0;
}

.plain-list li + li {
  margin-top: 6px;
}

.notice {
  background: var(--safe-bg);
  border: 1px solid var(--safe-line);
  border-radius: var(--radius);
  padding: 16px 18px;
}

.notice strong {
  color: var(--safe);
}

.req {
  color: var(--muted);
  margin-bottom: 8px;
}

code,
.ltr {
  direction: ltr;
  unicode-bidi: isolate;
}

code {
  font-family: ui-monospace, "Cascadia Code", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.1em 0.4em;
  border-radius: 6px;
  overflow-wrap: anywhere;
}

pre {
  direction: ltr;
  text-align: left;
  background: var(--code-block);
  color: var(--code-block-text);
  padding: 12px 14px;
  border-radius: 12px;
  overflow-x: auto;
  max-width: 100%;
  margin: 12px 0 0;
  white-space: pre-wrap;
}

pre code {
  background: transparent;
  color: inherit;
  padding: 0;
  white-space: pre-wrap;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin: 8px 0 0;
  padding: 0;
  list-style: none;
}

.app-index {
  columns: 1;
  margin: 12px 0 0;
  padding: 0 1.2rem 0 0;
}

.app-index li {
  break-inside: avoid;
  margin: 0 0 6px;
}

@media (min-width: 720px) {
  .app-index {
    columns: 2;
  }
}

@media (min-width: 1040px) {
  .app-index {
    columns: 3;
  }
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.steps > li {
  counter-increment: step;
  position: relative;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 16px 64px 16px 18px;
  margin: 0 0 12px;
}

.steps > li::before {
  content: counter(step);
  position: absolute;
  right: 16px;
  top: 18px;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--accent);
  color: var(--on-accent);
  font-weight: 700;
  display: grid;
  place-items: center;
  line-height: 1;
}

.source-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.source-list a {
  font-weight: 700;
}

.page-head {
  padding-top: 36px;
}

.crumb {
  margin: 0 0 14px;
}

.crumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 4px 0;
  margin: 0;
  padding: 0;
  list-style: none;
  color: var(--muted);
  font-size: 0.92rem;
}

.crumb a {
  color: var(--link);
  text-decoration: none;
}

.crumb a:hover {
  text-decoration: underline;
}

.crumb li + li::before {
  content: "/";
  margin-inline: 8px;
  color: var(--muted);
}

.crumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 700;
}

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

.site-footer {
  background: var(--header-bg);
  color: #d5e2e6;
  padding: 40px 20px 44px;
  border-top: 3px solid var(--accent);
}

.footer-inner {
  max-width: var(--max);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  text-align: center;
}

.fsf-mark {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  color: #fff;
  text-decoration: none;
}

.fsf-mark img {
  width: min(210px, 58vw);
  height: auto;
  background: #fff;
  border-radius: 18px;
  padding: 8px;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.22);
}

.fsf-mark span {
  font-weight: 700;
}

.fsf-mark:hover {
  color: var(--accent);
}

.site-footer nav {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  margin: 0;
  width: min(720px, 100%);
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.site-footer nav a {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 8px 14px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.07);
  color: #e7f4f6;
  text-decoration: none;
  text-align: center;
  line-height: 1.45;
}

.site-footer nav a:hover {
  background: rgba(124, 197, 204, 0.2);
  color: #fff;
}

.site-footer p {
  margin: 0;
}

@media (min-width: 720px) {
  .grid-2,
  .path-grid {
    grid-template-columns: 1fr 1fr;
  }

  .feature-list {
    grid-template-columns: 1fr 1fr;
  }

  .lesson {
    grid-template-columns: minmax(200px, 300px) 1fr;
    align-items: start;
  }
}

.icon-badge {
  width: 46px;
  height: 46px;
  border-radius: 12px;
  background: var(--badge);
  color: var(--ink);
  display: grid;
  place-items: center;
  flex: none;
}

.icon-badge svg,
.illu {
  display: block;
}

.icon-badge svg {
  width: 26px;
  height: 26px;
}

.lesson-grid,
.path-grid {
  display: grid;
  gap: 12px;
}

.path-card {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 14px 16px;
  text-decoration: none;
  color: var(--text);
}

.path-card:hover {
  color: var(--text);
  border-color: var(--accent);
}

.path-card img {
  width: 72px;
  height: auto;
  flex: none;
  border-radius: 10px;
}

.path-card strong {
  display: block;
  color: var(--ink);
}

.path-card span {
  min-width: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.lesson {
  display: grid;
  gap: 14px;
  margin: 0 0 22px;
}

.illu-frame {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 12px;
  display: grid;
  place-items: center;
}

.illu-frame img {
  width: 100%;
  max-width: 100%;
  height: auto;
}

.shot-stack {
  display: grid;
  gap: 10px;
  width: 100%;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 8px;
  padding: 0;
  list-style: none;
}

.toc a {
  display: inline-block;
  background: var(--chip);
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 4px 12px;
  text-decoration: none;
  color: var(--ink);
}

.toc a:hover {
  border-color: var(--accent);
  color: var(--ink);
}

.faq details {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  margin: 0 0 8px;
}

.faq summary {
  cursor: pointer;
  font-weight: 700;
  color: var(--ink);
  padding: 12px 16px;
}

.faq summary:hover {
  background: var(--soft);
}

.faq .answer {
  padding: 0 16px 14px;
}

.license-table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  background: var(--card);
  border-radius: 12px;
  overflow: hidden;
}

.license-table th,
.license-table td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: right;
  vertical-align: top;
  overflow-wrap: anywhere;
}

.license-table th {
  background: var(--badge);
  color: var(--ink);
}

.js .reveal {
  animation: none;
}

@media (prefers-reduced-motion: no-preference) {
  .js .reveal.is-in {
    animation: rise 0.45s ease both;
  }
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: none;
  }
}

.theme-btn {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-inline-start: auto;
  padding: 0;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 10px;
  background: transparent;
  color: #fff;
  cursor: pointer;
}

.theme-btn svg {
  width: 22px;
  height: 22px;
}

.theme-icon-sun {
  display: none;
}

html[data-theme="dark"] .theme-icon-moon {
  display: none;
}

html[data-theme="dark"] .theme-icon-sun {
  display: block;
}

@media (prefers-color-scheme: dark) {
  html:not([data-theme="light"]) .theme-icon-moon {
    display: none;
  }

  html:not([data-theme="light"]) .theme-icon-sun {
    display: block;
  }
}

.route {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 18px 26px;
  list-style: none;
  margin: 8px 0 16px;
  padding: 0;
}

.route li {
  position: relative;
  flex: 1 1 8.5rem;
  background: var(--card);
  border: 2px solid var(--accent);
  border-radius: 14px;
  padding: 14px 12px;
  text-align: center;
  color: var(--ink);
  font-weight: 700;
  line-height: 1.45;
}

.route li span {
  display: block;
  margin-top: 4px;
  color: var(--muted);
  font-weight: 400;
  font-size: 0.92rem;
}

.route li + li::before {
  content: "←";
  position: absolute;
  top: 50%;
  right: -22px;
  transform: translateY(-50%);
  color: var(--accent);
  font-weight: 400;
  line-height: 1;
}

.key-pair {
  display: grid;
  gap: 12px;
  margin: 8px 0 16px;
}

.key-pair article {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 14px 16px;
}

.key-pair h3 {
  margin: 0 0 6px;
}

@media (min-width: 720px) {
  .key-pair {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1380px) {
  .nav-btn {
    display: none;
  }

  .theme-btn {
    margin-inline-start: 0;
    margin-inline-end: auto;
  }

  .site-nav {
    display: flex;
    flex-direction: row;
    width: auto;
    padding: 0;
    gap: 2px;
  }

  .site-nav a {
    padding: 8px 8px;
    font-size: 0.95rem;
  }

  .hero {
    padding-top: 72px;
  }

  .grid-3,
  .path-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 1379px) {
  .header-bar {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto auto;
    align-items: center;
    column-gap: 8px;
    row-gap: 0;
    padding: 8px 12px;
  }

  .brand span {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .theme-btn {
    margin: 0;
  }

  .nav-toggle:checked ~ .site-nav {
    grid-column: 1 / -1;
    margin-top: 8px;
    padding-top: 8px;
    border-top: 1px solid rgba(255, 255, 255, 0.14);
  }

  .site-nav a {
    display: flex;
    align-items: center;
    min-height: 48px;
    padding: 10px 14px;
    background: rgba(255, 255, 255, 0.06);
  }

  .site-nav a:hover,
  .site-nav a[aria-current="page"] {
    background: rgba(124, 197, 204, 0.28);
    color: #fff;
  }
}

@media (max-width: 719px) {
  .wrap {
    padding: 4px 14px 56px;
  }

  .hero {
    padding-top: 28px;
  }

  .page-head {
    padding-top: 20px;
  }

  .hero .actions,
  .card .actions {
    flex-direction: column;
    align-items: stretch;
  }

  .btn {
    text-align: center;
  }

  .toc a {
    display: inline-flex;
    align-items: center;
    min-height: 40px;
  }

  .faq summary {
    padding: 14px 16px;
  }

  .route {
    flex-direction: column;
    align-items: stretch;
    gap: 26px;
  }

  .route li {
    flex: none;
  }

  .route li + li::before {
    content: "↓";
    top: -22px;
    right: 0;
    left: 0;
    transform: none;
    text-align: center;
  }

  .steps > li {
    padding: 14px 56px 14px 14px;
  }
}

@media (min-width: 560px) {
  .site-footer nav {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 960px) {
  .site-footer nav {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (max-width: 480px) {
  .site-footer {
    padding: 28px 14px calc(24px + env(safe-area-inset-bottom));
  }

  .fsf-mark img {
    width: min(180px, 56vw);
  }
}