/* NullVPN site. One stylesheet for both languages; Persian pages set
   dir="rtl" and lang="fa", and everything here uses logical properties so
   the layout mirrors on its own. */

@font-face {
  font-family: "Estedad";
  src: url("fonts/Estedad-Regular.ttf") format("truetype");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Estedad";
  src: url("fonts/Estedad-Bold.ttf") format("truetype");
  font-weight: 700;
  font-display: swap;
}

:root {
  --bg: #0b1210;
  --bg-2: #120f1a;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-2: rgba(255, 255, 255, 0.07);
  --border: rgba(255, 255, 255, 0.10);
  --text: #e8eeeb;
  --muted: #9aa8a2;
  --accent: #34d399;
  --accent-strong: #10b981;
  --accent-ink: #04130d;
  --ice: #7dd3fc;
  --violet: #a78bfa;
  --warn: #fbbf24;
  --code-bg: rgba(0, 0, 0, 0.35);
  --shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
  --radius: 16px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  color-scheme: dark;
}

:root[data-theme="light"] {
  --bg: #f4f7f5;
  --bg-2: #eef0f7;
  --surface: #ffffff;
  --surface-2: #f1f5f3;
  --border: rgba(12, 30, 22, 0.12);
  --text: #0f1a15;
  --muted: #55655e;
  --accent: #059669;
  --accent-strong: #047857;
  --accent-ink: #ffffff;
  --ice: #0369a1;
  --violet: #6d28d9;
  --warn: #b45309;
  --code-bg: #eef2f0;
  --shadow: 0 18px 50px rgba(15, 40, 30, 0.12);
  color-scheme: light;
}

@media (prefers-color-scheme: light) {
  :root:not([data-theme="dark"]) {
    --bg: #f4f7f5;
    --bg-2: #eef0f7;
    --surface: #ffffff;
    --surface-2: #f1f5f3;
    --border: rgba(12, 30, 22, 0.12);
    --text: #0f1a15;
    --muted: #55655e;
    --accent: #059669;
    --accent-strong: #047857;
    --accent-ink: #ffffff;
    --ice: #0369a1;
    --violet: #6d28d9;
    --warn: #b45309;
    --code-bg: #eef2f0;
    --shadow: 0 18px 50px rgba(15, 40, 30, 0.12);
    color-scheme: light;
  }
}

html[lang="fa"] { --font: "Estedad", "Inter", system-ui, sans-serif; }

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background:
    radial-gradient(1200px 700px at 0% -10%, rgba(52, 211, 153, 0.10), transparent 60%),
    radial-gradient(900px 600px at 110% 110%, rgba(167, 139, 250, 0.10), transparent 60%),
    linear-gradient(160deg, var(--bg), var(--bg-2));
  background-attachment: fixed;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }

code, kbd {
  font-family: var(--mono);
  font-size: 0.88em;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 0.1em 0.4em;
  direction: ltr;
  unicode-bidi: isolate;
}

pre {
  font-family: var(--mono);
  font-size: 0.88rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 14px 16px;
  overflow-x: auto;
  direction: ltr;
  text-align: left;
  line-height: 1.55;
}
pre code { background: none; border: 0; padding: 0; font-size: inherit; }

/* A command block with its copy button, which stays put while the code scrolls. */
.code-box { position: relative; }
/* The code scrolls, not the block, so nothing slides under the button. */
.code-box pre { padding-right: 52px; overflow: hidden; }
.code-box pre > code { display: block; overflow-x: auto; }
.copy-btn {
  position: absolute;
  top: 8px;
  right: 8px;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--bg);
  color: var(--muted);
  cursor: pointer;
  transition: color .15s, background .15s, border-color .15s;
}
.copy-btn svg { width: 16px; height: 16px; }
.copy-btn:hover { color: var(--text); border-color: var(--muted); }
.copy-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.copy-btn.is-done { color: var(--accent); border-color: var(--accent); }

.wrap { width: min(1120px, 100% - 32px); margin-inline: auto; }

/* ---------- header ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: saturate(160%) blur(14px);
  -webkit-backdrop-filter: saturate(160%) blur(14px);
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  border-bottom: 1px solid var(--border);
}
.site-header .wrap {
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--text);
}
.brand:hover { text-decoration: none; }
.brand img { width: 32px; height: 32px; }

.nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-inline-start: auto;
  flex-wrap: wrap;
}
.nav a, .nav button {
  color: var(--muted);
  font: inherit;
  font-size: 0.95rem;
  padding: 8px 12px;
  border-radius: 10px;
  background: none;
  border: 0;
  cursor: pointer;
}
.nav a:hover, .nav button:hover { color: var(--text); background: var(--surface-2); text-decoration: none; }
.nav a[aria-current="page"] { color: var(--text); background: var(--surface-2); }
.nav .lang { font-weight: 700; }
.nav .icon-btn { display: inline-grid; place-items: center; width: 38px; height: 38px; padding: 0; }
.nav .icon-btn svg { width: 18px; height: 18px; }

@media (max-width: 640px) {
  .site-header .wrap { flex-wrap: wrap; padding-block: 8px; gap: 6px; }
  .nav { margin-inline-start: 0; width: 100%; justify-content: space-between; }
  .nav a, .nav button { padding: 8px 9px; font-size: 0.9rem; }
}

/* ---------- buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font: inherit;
  font-weight: 700;
  padding: 13px 22px;
  border-radius: 12px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
  text-align: center;
}
.btn:hover { text-decoration: none; transform: translateY(-1px); }
.btn svg { width: 20px; height: 20px; flex: none; }
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  color: var(--accent-ink);
  box-shadow: 0 10px 30px rgba(16, 185, 129, 0.28);
}
.btn-ghost {
  background: var(--surface);
  color: var(--text);
  border-color: var(--border);
}
.btn-ghost:hover { background: var(--surface-2); }
.btn[aria-disabled="true"] {
  opacity: 0.55;
  pointer-events: none;
  box-shadow: none;
}
.btn-small { padding: 9px 14px; font-size: 0.92rem; border-radius: 10px; }

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

.hero {
  padding-block: 72px 40px;
  text-align: center;
}
.hero-logo {
  width: 120px;
  height: 120px;
  margin: 0 auto 20px;
  filter: drop-shadow(0 16px 40px rgba(125, 211, 252, 0.28));
}
.hero h1 {
  font-size: clamp(2.2rem, 6vw, 3.6rem);
  line-height: 1.12;
  margin: 0 0 14px;
  letter-spacing: -0.02em;
}
html[lang="fa"] .hero h1 { letter-spacing: 0; line-height: 1.35; }
.hero h1 .grad {
  background: linear-gradient(90deg, var(--accent), var(--ice) 60%, var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero .lead {
  font-size: clamp(1.05rem, 2.4vw, 1.25rem);
  color: var(--muted);
  max-width: 680px;
  margin: 0 auto 28px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}
.hero-note {
  margin-top: 14px;
  font-size: 0.9rem;
  color: var(--muted);
}
.pills {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-top: 26px;
  padding: 0;
  list-style: none;
}
.pills li {
  font-size: 0.85rem;
  color: var(--muted);
  border: 1px solid var(--border);
  background: var(--surface);
  border-radius: 999px;
  padding: 5px 12px;
}

.shot {
  margin: 36px auto 0;
  width: 100%;
  max-width: min(980px, 100%);
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

/* ---------- sections ---------- */

section { padding-block: 56px; }
.section-title {
  text-align: center;
  margin-bottom: 36px;
}
.section-title h2 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}
.section-title p { color: var(--muted); margin: 0 auto; max-width: 640px; }

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.card h3 { margin: 10px 0 6px; font-size: 1.08rem; }
.card p { margin: 0; color: var(--muted); font-size: 0.96rem; }
.card .ico {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: color-mix(in srgb, var(--accent) 14%, transparent);
  color: var(--accent);
}
.card .ico svg { width: 22px; height: 22px; }
.card .ico.ice { background: color-mix(in srgb, var(--ice) 14%, transparent); color: var(--ice); }
.card .ico.violet { background: color-mix(in srgb, var(--violet) 16%, transparent); color: var(--violet); }

.cores { grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.cores .card h3 { font-size: 1.2rem; }
.tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 2px 9px;
  border-radius: 999px;
  background: var(--surface-2);
  color: var(--muted);
  border: 1px solid var(--border);
  vertical-align: middle;
  margin-inline-start: 6px;
}

/* ---------- tables ---------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--border); border-radius: var(--radius); background: var(--surface); }
table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th, td { padding: 12px 16px; text-align: start; border-bottom: 1px solid var(--border); }
tr:last-child td { border-bottom: 0; }
th { color: var(--muted); font-weight: 700; font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.04em; }
html[lang="fa"] th { text-transform: none; letter-spacing: 0; }
td:first-child { font-weight: 700; }

/* ---------- downloads ---------- */

.release-line {
  text-align: center;
  color: var(--muted);
  margin: -18px 0 30px;
  font-size: 0.95rem;
}
.release-line strong { color: var(--text); }

.platforms { display: grid; grid-template-columns: minmax(0, 1fr); gap: 18px; }
.platform {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  scroll-margin-top: 90px;
}
.platform.is-you { border-color: color-mix(in srgb, var(--accent) 55%, transparent); box-shadow: 0 0 0 3px color-mix(in srgb, var(--accent) 16%, transparent); }
.platform-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 14px;
  flex-wrap: wrap;
}
.platform-head .ico { width: 46px; height: 46px; border-radius: 12px; display: grid; place-items: center; background: var(--surface-2); color: var(--text); }
.platform-head .ico svg { width: 26px; height: 26px; }
.platform-head h2 { margin: 0; font-size: 1.3rem; }
.platform-head .req { color: var(--muted); font-size: 0.9rem; }
.you-badge {
  display: none;
  margin-inline-start: auto;
  font-size: 0.8rem;
  font-weight: 700;
  color: var(--accent);
  border: 1px solid color-mix(in srgb, var(--accent) 45%, transparent);
  border-radius: 999px;
  padding: 3px 10px;
}
.platform.is-you .you-badge { display: inline-block; }

.files { display: grid; gap: 10px; }
.file {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 12px;
  background: var(--surface-2);
  border: 1px solid var(--border);
}
.file .name { font-weight: 700; }
.file .meta { color: var(--muted); font-size: 0.85rem; }
.file .meta code { font-size: 0.8rem; }
.file.recommended { border-color: color-mix(in srgb, var(--accent) 40%, transparent); }
.file .rec {
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
  margin-inline-start: 6px;
}
@media (max-width: 560px) {
  .file { grid-template-columns: 1fr; }
  .file .btn { width: 100%; }
}

.soon {
  color: var(--muted);
  font-size: 0.95rem;
  padding: 14px;
  border-radius: 12px;
  border: 1px dashed var(--border);
  background: var(--surface-2);
}

.callout {
  border-radius: 12px;
  padding: 12px 16px;
  margin: 14px 0 0;
  font-size: 0.93rem;
  background: color-mix(in srgb, var(--warn) 9%, transparent);
  border: 1px solid color-mix(in srgb, var(--warn) 30%, transparent);
}
.callout.info {
  background: color-mix(in srgb, var(--ice) 8%, transparent);
  border-color: color-mix(in srgb, var(--ice) 28%, transparent);
}
.callout p { margin: 0; }
.callout p + p { margin-top: 6px; }
.callout pre { margin: 8px 0; }

/* ---------- guide ---------- */

.guide-layout {
  display: grid;
  grid-template-columns: 240px minmax(0, 1fr);
  gap: 36px;
  padding-block: 40px 64px;
}
.toc {
  position: sticky;
  top: 84px;
  align-self: start;
  font-size: 0.93rem;
}
.toc strong { display: block; margin-bottom: 8px; color: var(--muted); font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.06em; }
html[lang="fa"] .toc strong { text-transform: none; letter-spacing: 0; }
.toc ol { list-style: none; margin: 0; padding: 0; display: grid; gap: 2px; }
.toc a { display: block; color: var(--muted); padding: 6px 10px; border-radius: 8px; }
.toc a:hover { background: var(--surface-2); color: var(--text); text-decoration: none; }
@media (max-width: 860px) {
  .guide-layout { grid-template-columns: minmax(0, 1fr); gap: 18px; }
  .toc { position: static; background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 16px; }
  .toc ol { grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); }
}

.doc h1 { font-size: clamp(1.8rem, 4.5vw, 2.5rem); margin: 0 0 8px; }
.doc > .lead { color: var(--muted); margin: 0 0 28px; font-size: 1.08rem; }
.doc h2 {
  font-size: 1.5rem;
  margin: 44px 0 12px;
  padding-top: 8px;
  scroll-margin-top: 84px;
}
.doc h3 { font-size: 1.12rem; margin: 26px 0 8px; scroll-margin-top: 84px; }
.doc p, .doc li { color: var(--text); }
.doc ol, .doc ul { padding-inline-start: 1.4em; }
.doc li { margin: 6px 0; }
.doc .muted { color: var(--muted); }
.doc .table-wrap { margin: 12px 0 18px; }

.steps { counter-reset: step; list-style: none; padding: 0 !important; }
.steps > li {
  counter-increment: step;
  position: relative;
  padding-inline-start: 44px;
  margin: 14px 0;
}
.steps > li::before {
  content: counter(step);
  position: absolute;
  inset-inline-start: 0;
  top: 0;
  width: 30px;
  height: 30px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 700;
  font-size: 0.9rem;
  background: color-mix(in srgb, var(--accent) 16%, transparent);
  color: var(--accent);
}
html[lang="fa"] .steps > li::before { content: counter(step, persian); }

.ui { font-weight: 700; color: var(--text); background: var(--surface-2); border: 1px solid var(--border); border-radius: 6px; padding: 0 6px; -webkit-box-decoration-break: clone; box-decoration-break: clone; overflow-wrap: anywhere; }

details {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 0 16px;
  margin: 10px 0;
}
details summary {
  cursor: pointer;
  font-weight: 700;
  padding: 14px 0;
  list-style: none;
}
details summary::-webkit-details-marker { display: none; }
details summary::after { content: "+"; float: inline-end; color: var(--muted); font-weight: 400; }
details[open] summary::after { content: "–"; }
details > :not(summary) { margin-top: 0; }
details[open] { padding-bottom: 14px; }

/* ---------- community / footer ---------- */

.cta-band {
  text-align: center;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 40px 22px;
}
.cta-band h2 { margin: 0 0 8px; font-size: clamp(1.5rem, 4vw, 2rem); }
.cta-band p { color: var(--muted); margin: 0 auto 22px; max-width: 560px; }

/* ---------- GitHub star button ---------- */

.hero-star { display: flex; justify-content: center; margin: 14px 0 0; }
.star-btn {
  display: inline-flex;
  align-items: stretch;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  color: var(--text);
  font-weight: 600;
  font-size: 0.95rem;
  overflow: hidden;
  transition: border-color .15s, background .15s;
}
.star-btn:hover { text-decoration: none; border-color: color-mix(in srgb, var(--warn) 55%, var(--border)); background: var(--surface-2); }
.star-btn:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.star-main { display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px; }
.star-main svg { width: 17px; height: 17px; color: var(--warn); }
.star-count {
  display: inline-flex;
  align-items: center;
  padding: 10px 14px;
  border-inline-start: 1px solid var(--border);
  background: var(--surface-2);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
}
.star-count[hidden] { display: none; }

.site-footer {
  border-top: 1px solid var(--border);
  padding-block: 32px;
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 24px;
}
.site-footer .wrap { display: grid; gap: 18px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 6px 18px; }
.foot-links a { color: var(--muted); }
.foot-links a:hover { color: var(--text); }
.credits { font-size: 0.85rem; }
.credits a { color: var(--muted); text-decoration: underline; text-decoration-color: var(--border); }

.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .btn { transition: none; }
  .btn:hover { transform: none; }
}