:root {
  --ink: #12141a;
  --ink-2: #1c2030;
  --paper: #f2f0eb;
  --mute: #9aa3b5;
  --line: rgba(242, 240, 235, 0.12);
  --accent: #ff4d2e;
  --accent-2: #ffb347;
  --glow: rgba(255, 77, 46, 0.35);
  --font-display: "Syne", "Helvetica Neue", sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;
  --max: 1080px;
  --nav-h: 4.25rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  color: var(--paper);
  background:
    radial-gradient(1200px 600px at 80% -10%, rgba(255, 77, 46, 0.18), transparent 55%),
    radial-gradient(900px 500px at -10% 30%, rgba(255, 179, 71, 0.08), transparent 50%),
    linear-gradient(165deg, #0b0d12 0%, var(--ink) 45%, #151a28 100%);
  background-attachment: fixed;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

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

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

.site-nav {
  position: sticky;
  top: 0;
  z-index: 40;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0 clamp(1rem, 4vw, 2.5rem);
  backdrop-filter: blur(14px);
  background: rgba(12, 14, 20, 0.72);
  border-bottom: 1px solid var(--line);
}

.brand {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.15rem;
  letter-spacing: -0.03em;
  display: inline-flex;
  align-items: baseline;
  gap: 0.15rem;
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.25rem;
  font-size: 0.92rem;
  color: var(--mute);
}

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

.nav-links .is-active {
  color: var(--paper);
}

.lang-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.lang-switch a {
  color: var(--mute);
}

.lang-switch a.is-active,
.lang-switch a:hover {
  color: var(--paper);
}

.lang-switch .sep {
  opacity: 0.35;
}

.wrap {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
}

/* —— Landing hero —— */
.hero {
  position: relative;
  min-height: calc(100svh - var(--nav-h));
  display: grid;
  align-items: end;
  padding: clamp(2rem, 6vw, 4.5rem) 0 clamp(3rem, 8vw, 5.5rem);
  overflow: hidden;
}

.hero-stage {
  width: min(100% - 2rem, var(--max));
  margin-inline: auto;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(220px, 0.9fr);
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
}

.hero-panel {
  justify-self: end;
  width: min(100%, 420px);
  aspect-ratio: 4 / 5;
  border: 1px solid var(--line);
  background:
    linear-gradient(145deg, rgba(255, 77, 46, 0.18), transparent 42%),
    repeating-linear-gradient(
      0deg,
      transparent,
      transparent 28px,
      rgba(242, 240, 235, 0.04) 28px,
      rgba(242, 240, 235, 0.04) 29px
    ),
    repeating-linear-gradient(
      90deg,
      transparent,
      transparent 28px,
      rgba(242, 240, 235, 0.04) 28px,
      rgba(242, 240, 235, 0.04) 29px
    ),
    #161a26;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  transform: rotate(2.5deg);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 1.25rem;
  padding: 1.5rem;
}

.hero-panel-caption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  text-align: center;
}

.hero-panel-logo {
  width: min(58%, 220px);
  height: auto;
  border-radius: 22%;
  box-shadow:
    0 18px 40px rgba(0, 0, 0, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.08);
}

.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 36rem;
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
  margin: 0 0 1rem;
}

.hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.2rem, 10vw, 6.2rem);
  line-height: 0.92;
  letter-spacing: -0.05em;
  margin: 0 0 1.1rem;
}

.hero h1 span {
  color: var(--accent);
}

.hero-lead {
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  color: var(--mute);
  max-width: 30rem;
  margin: 0 0 1.75rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.85rem;
  padding: 0.7rem 1.2rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}

.btn:hover {
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 10px 30px var(--glow);
}

.btn-primary:hover {
  background: #ff634a;
}

.btn-ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--paper);
}

.btn-ghost:hover {
  border-color: rgba(242, 240, 235, 0.35);
}

section.band {
  padding: clamp(2.5rem, 6vw, 4.5rem) 0;
  border-top: 1px solid var(--line);
}

.band h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.5vw, 2.2rem);
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}

.band > .wrap > p,
.section-lead {
  color: var(--mute);
  max-width: 40rem;
  margin: 0 0 1.75rem;
}

.feature-list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: 0.85rem;
}

.feature-list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.85rem;
  align-items: start;
  padding: 1rem 1.1rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.02);
}

.feature-list .mark {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  margin-top: 0.2rem;
}

.feature-list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 0.2rem;
}

.feature-list span {
  color: var(--mute);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.5rem 0 2.5rem;
  color: var(--mute);
  font-size: 0.88rem;
}

.site-footer .wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  justify-content: space-between;
}

.site-footer a:hover {
  color: var(--paper);
}

/* —— Inner pages —— */
.page-hero {
  padding: clamp(2rem, 5vw, 3.5rem) 0 1.25rem;
}

.page-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3rem);
  letter-spacing: -0.04em;
  margin: 0 0 0.6rem;
}

.page-hero p {
  margin: 0;
  color: var(--mute);
  max-width: 40rem;
}

.help-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2rem;
  padding-bottom: 3.5rem;
  align-items: start;
}

.toc {
  position: sticky;
  top: calc(var(--nav-h) + 1rem);
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  padding: 1rem;
}

.toc h2 {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
  margin: 0 0 0.75rem;
  font-weight: 500;
}

.toc ol {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.toc a {
  display: block;
  padding: 0.35rem 0.45rem;
  border-radius: 6px;
  color: var(--mute);
  font-size: 0.9rem;
}

.toc a:hover,
.toc a:focus-visible {
  color: var(--paper);
  background: rgba(255, 255, 255, 0.04);
}

.help-article {
  display: grid;
  gap: 2rem;
}

.topic {
  scroll-margin-top: calc(var(--nav-h) + 1rem);
  border-top: 1px solid var(--line);
  padding-top: 1.5rem;
}

.topic h2 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: -0.03em;
  margin: 0 0 0.75rem;
}

.topic h3 {
  font-size: 1rem;
  margin: 1.1rem 0 0.35rem;
  color: var(--accent-2);
}

.topic p {
  margin: 0 0 0.75rem;
  color: rgba(242, 240, 235, 0.86);
}

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

.kbd-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.92rem;
  margin-top: 0.5rem;
}

.kbd-table th,
.kbd-table td {
  text-align: left;
  padding: 0.55rem 0.4rem;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.kbd-table th {
  color: var(--mute);
  font-weight: 500;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.kbd-table code {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-2);
}

/* Support */
.contact-grid {
  display: grid;
  gap: 0.85rem;
  padding-bottom: 3.5rem;
}

.contact-card {
  display: grid;
  gap: 0.35rem;
  padding: 1.15rem 1.25rem;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.03);
}

.contact-card .label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--mute);
}

.contact-card a,
.contact-card .value {
  font-family: var(--font-display);
  font-size: 1.25rem;
  letter-spacing: -0.02em;
  word-break: break-word;
}

.contact-card a:hover {
  color: var(--accent-2);
}

@media (max-width: 820px) {
  .hero-stage {
    grid-template-columns: 1fr;
  }

  .hero-panel {
    order: -1;
    justify-self: center;
    width: min(100%, 280px);
    aspect-ratio: 1;
    transform: none;
    margin-bottom: 0.5rem;
  }

  .help-layout {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
  }

  .nav-links {
    gap: 0.85rem;
    font-size: 0.85rem;
  }
}

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

  .btn:hover {
    transform: none;
  }
}