/* Theme tokens */
html[data-theme="dark"] {
  --bg: #0c1017;
  --bg-elevated: #121a24;
  --surface: #161f2c;
  --header-bg: rgba(12, 16, 23, 0.82);
  --border: #2a3544;
  --text: #e8edf4;
  --muted: #8b9cb3;
  --accent: #5b9cf5;
  --accent-hover: #7eb0ff;
  --code-bg: #0a0e14;
  --shadow: rgba(0, 0, 0, 0.35);
  --focus-ring: rgba(91, 156, 245, 0.45);
}

html[data-theme="light"] {
  --bg: #f0f4fa;
  --bg-elevated: #ffffff;
  --surface: #ffffff;
  --header-bg: rgba(255, 255, 255, 0.86);
  --border: #d8e0eb;
  --text: #1a2332;
  --muted: #4a5a6e;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --code-bg: #f1f5f9;
  --shadow: rgba(15, 23, 42, 0.08);
  --focus-ring: rgba(37, 99, 235, 0.35);
}

:root {
  --radius: 12px;
  --radius-sm: 8px;
  --font: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  --mono: ui-monospace, "Cascadia Code", "Source Code Pro", Menlo, monospace;
  --header-h: 3.25rem;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 1rem);
}

@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;
  }
}

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
  background-image: radial-gradient(
      ellipse 90% 60% at 50% -25%,
      rgba(91, 156, 245, 0.1),
      transparent 55%
    ),
    radial-gradient(
      ellipse 50% 40% at 100% 0%,
      rgba(91, 156, 245, 0.05),
      transparent 50%
    );
  min-height: 100vh;
}

html[data-theme="light"] body {
  background-image: radial-gradient(
      ellipse 90% 60% at 50% -20%,
      rgba(37, 99, 235, 0.06),
      transparent 55%
    ),
    radial-gradient(
      ellipse 50% 40% at 100% 0%,
      rgba(37, 99, 235, 0.04),
      transparent 50%
    );
}

a {
  color: var(--accent);
  text-decoration: none;
  border-radius: 4px;
  transition: color 0.15s ease;
}

a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  z-index: 9999;
  padding: 0.75rem 1rem;
  background: var(--accent);
  color: #fff;
  font-weight: 600;
  border-radius: var(--radius-sm);
}

.skip-link:focus {
  left: 1rem;
  top: 1rem;
}

/* Sticky header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 var(--shadow);
}

.site-header__shell {
  max-width: 900px;
  margin: 0 auto;
  padding: 0.65rem 1.25rem 0.75rem;
}

.site-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
}

.site-header__brand {
  font-weight: 700;
  font-size: 1rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
  white-space: nowrap;
}

.site-header__brand:hover {
  color: var(--accent);
  text-decoration: none;
}

.site-nav {
  margin-top: 0.45rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--border);
}

.site-nav__menu {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  gap: 0.15rem 0.35rem;
}

.site-nav__item {
  position: relative;
  list-style: none;
}

.site-nav__trigger {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  font-family: var(--font);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  padding: 0.4rem 0.55rem;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  line-height: 1.2;
}

.site-nav__trigger:hover {
  color: var(--text);
  background: var(--surface);
}

.site-nav__item:is(:hover, :focus-within) .site-nav__trigger {
  color: var(--text);
}

.site-nav__item.is-open .site-nav__trigger {
  color: var(--text);
  background: var(--surface);
  border-color: var(--border);
}

.site-nav__trigger:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.site-nav__caret {
  display: block;
  width: 0;
  height: 0;
  border-left: 4px solid transparent;
  border-right: 4px solid transparent;
  border-top: 5px solid currentColor;
  opacity: 0.75;
  flex-shrink: 0;
  transition: transform 0.15s ease;
}

.site-nav__item.is-open .site-nav__caret {
  transform: rotate(180deg);
}

.site-nav__submenu {
  position: absolute;
  top: calc(100% + 3px);
  left: 0;
  min-width: 11.5rem;
  margin: 0;
  padding: 0.4rem;
  list-style: none;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  box-shadow: 0 10px 28px var(--shadow);
  z-index: 100;
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  pointer-events: none;
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0.16s;
}

.site-nav__submenu li {
  list-style: none;
  margin: 0;
}

.site-nav__item:hover .site-nav__submenu,
.site-nav__item:focus-within .site-nav__submenu,
.site-nav__item.is-open .site-nav__submenu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  pointer-events: auto;
}

.site-nav__submenu a {
  display: block;
  padding: 0.45rem 0.6rem;
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.site-nav__submenu a:hover {
  background: var(--code-bg);
  color: var(--accent);
}

.site-header__actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  font-size: 1.15rem;
  line-height: 1;
  transition: border-color 0.15s, background 0.15s;
}

.theme-toggle:hover {
  border-color: var(--accent);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.theme-toggle__icon {
  display: none;
}

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

html[data-theme="light"] .theme-toggle__icon--moon {
  display: inline;
}

.main {
  padding-bottom: 4rem;
}

.wrap {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Hero */
.hero {
  padding: 2rem 0 2.5rem;
  border-bottom: 1px solid var(--border);
  margin-bottom: 2.5rem;
}

.hero__eyebrow {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--accent);
  margin: 0 0 0.5rem;
}

.hero h1 {
  font-size: clamp(1.85rem, 4vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  margin: 0 0 0.65rem;
  line-height: 1.15;
}

.tagline {
  color: var(--muted);
  font-size: 1.08rem;
  margin: 0 0 1.25rem;
  max-width: 42ch;
}

.tagline strong {
  color: var(--text);
  font-weight: 600;
}

.hero__hint {
  margin: 1rem 0 0;
  font-size: 0.95rem;
  line-height: 1.55;
  color: var(--muted);
  max-width: 40rem;
}

.hero__hint code {
  font-size: 0.88em;
}

.badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  margin-bottom: 1.25rem;
}

.badges img {
  height: 22px;
  vertical-align: middle;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  padding: 0.6rem 1.1rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  box-shadow: 0 1px 2px var(--shadow);
  transition: border-color 0.15s, background 0.15s, transform 0.1s;
}

.btn:hover {
  text-decoration: none;
  border-color: var(--accent);
  background: var(--bg-elevated);
}

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

.btn--primary {
  background: linear-gradient(180deg, #4a8ee8 0%, #3578d4 100%);
  border-color: #4a8ee8;
  color: #fff;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.25);
}

html[data-theme="light"] .btn--primary {
  background: linear-gradient(180deg, #3b82f6 0%, #2563eb 100%);
  border-color: #2563eb;
}

.btn--primary:hover {
  color: #fff;
  border-color: #6aa8ff;
  filter: brightness(1.05);
}

.btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

/* Install + code blocks */
.install-block {
  margin-top: 1rem;
  padding: 0.9rem 1rem;
  padding-right: 4.5rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 0.88rem;
  color: var(--accent);
  overflow-x: auto;
  line-height: 1.45;
}

.code-wrap {
  position: relative;
  margin: 0.75rem 0 1rem;
}

.code-wrap .code-block,
.code-wrap .install-block {
  margin-top: 0;
  margin-bottom: 0;
}

.copy-btn {
  position: absolute;
  top: 0.55rem;
  right: 0.55rem;
  z-index: 2;
  padding: 0.35rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 600;
  font-family: var(--font);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 6px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.copy-btn:hover {
  color: var(--text);
  border-color: var(--accent);
}

.copy-btn:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.copy-btn.is-done {
  color: #22c55e;
  border-color: rgba(34, 197, 94, 0.5);
}

html[data-theme="light"] .copy-btn.is-done {
  color: #16a34a;
}

pre.code-block {
  margin: 0;
  padding: 1rem 1.1rem;
  padding-top: 2.35rem;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.55;
  color: var(--text);
}

.code-wrap pre.code-block {
  padding-top: 2.35rem;
}

pre,
.code-block {
  margin: 0.75rem 0 1rem;
}

code {
  font-family: var(--mono);
  font-size: 0.88em;
  background: rgba(91, 156, 245, 0.12);
  padding: 0.12em 0.35em;
  border-radius: 4px;
  color: var(--accent);
}

html[data-theme="light"] code {
  background: rgba(37, 99, 235, 0.1);
}

pre code {
  background: none;
  padding: 0;
  color: inherit;
}

/* Sections */
.section {
  margin-bottom: 3rem;
}

.section__head {
  margin-bottom: 1.25rem;
}

.section h2 {
  font-size: 1.4rem;
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.section__lede {
  margin: 0;
  color: var(--muted);
  font-size: 1rem;
  max-width: 52ch;
}

.subsection-title {
  margin: 1.5rem 0 0.6rem;
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.01em;
  color: var(--text);
}

.feature-list {
  margin: 0.35rem 0 1rem;
  padding-left: 1.25rem;
  color: var(--text);
}

.feature-list li {
  margin-bottom: 0.45rem;
}

.feature-list li:last-child {
  margin-bottom: 0;
}

.author-section .author-card {
  max-width: 40rem;
  padding: 1.35rem 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px var(--shadow);
}

.author-card__name {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text);
}

.author-card__role {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.98rem;
}

.author-card__bio {
  margin: 0 0 1rem;
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1.55;
}

.author-social-label {
  margin: 0 0 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--muted);
}

.author-card__contact {
  margin: 0 0 1rem;
  font-size: 1rem;
}

.author-social {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.author-social__link {
  display: inline-block;
  padding: 0.4rem 0.85rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--accent);
  background: rgba(91, 156, 245, 0.1);
  border: 1px solid rgba(91, 156, 245, 0.25);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition:
    color 0.15s ease,
    background 0.15s ease,
    border-color 0.15s ease;
}

.author-social__link:hover {
  color: var(--accent-hover);
  background: rgba(91, 156, 245, 0.16);
  border-color: rgba(91, 156, 245, 0.4);
  text-decoration: none;
}

html[data-theme="light"] .author-social__link {
  background: rgba(37, 99, 235, 0.08);
  border-color: rgba(37, 99, 235, 0.2);
}

html[data-theme="light"] .author-social__link:hover {
  background: rgba(37, 99, 235, 0.12);
  border-color: rgba(37, 99, 235, 0.35);
}

.author-card__note {
  margin: 1rem 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
  font-size: 0.88rem;
  color: var(--muted);
  line-height: 1.5;
}

.author-card__note code {
  font-size: 0.85em;
}

.fonts-images-list {
  margin: 0 0 1rem;
  padding-left: 1.35rem;
  color: var(--text);
}

.fonts-images-list li {
  margin-bottom: 0.75rem;
}

.fonts-images-list li:last-child {
  margin-bottom: 0;
}

.steps {
  list-style: none;
  margin: 0;
  padding: 0;
  padding-left: 0.35rem;
  counter-reset: step;
}

.steps__item {
  position: relative;
  padding: 1.15rem 1.15rem 1.15rem 1.35rem;
  margin-bottom: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: 0 1px 3px var(--shadow);
  counter-increment: step;
}

.steps__item::before {
  content: counter(step);
  position: absolute;
  left: -0.5rem;
  top: 1rem;
  width: 1.75rem;
  height: 1.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(145deg, var(--accent) 0%, #4a8ee8 100%);
  border-radius: 50%;
  border: 2px solid var(--bg);
  box-shadow: 0 1px 4px var(--shadow);
}

.steps__title {
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
  font-size: 1rem;
}

.steps__text {
  margin: 0 0 0.75rem;
  color: var(--muted);
  font-size: 0.98rem;
}

.steps__text:last-child {
  margin-bottom: 0;
}

.note {
  padding: 1rem 1.1rem;
  background: rgba(91, 156, 245, 0.08);
  border-left: 3px solid var(--accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  margin: 1.25rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

html[data-theme="light"] .note {
  background: rgba(37, 99, 235, 0.06);
}

.site-footer {
  margin-top: 3rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--border);
}

.site-footer__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1rem;
}

.site-footer__links a {
  font-size: 0.9rem;
  font-weight: 500;
}

.site-footer__meta {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

/* Back to top */
.back-to-top {
  position: fixed;
  right: max(1.25rem, env(safe-area-inset-right));
  bottom: max(1.25rem, env(safe-area-inset-bottom));
  z-index: 40;
  width: 2.75rem;
  height: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0;
  font-size: 1.25rem;
  line-height: 1;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 50%;
  box-shadow: 0 4px 14px var(--shadow);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity 0.2s, visibility 0.2s, transform 0.2s;
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  border-color: var(--accent);
}

.back-to-top:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

@media (max-width: 640px) {
  .site-nav__menu {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-nav__item {
    border-bottom: 1px solid var(--border);
  }

  .site-nav__item:last-child {
    border-bottom: none;
  }

  .site-nav__trigger {
    width: 100%;
    justify-content: space-between;
    padding: 0.55rem 0.35rem 0.55rem 0.15rem;
    font-size: 0.78rem;
  }

  /* Touch / narrow: only .is-open reveals submenu (hover disabled by display) */
  .site-nav__submenu {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    padding: 0 0 0.65rem 0.5rem;
    background: transparent;
    transform: none;
    transition: none;
  }

  .site-nav__item:not(.is-open) .site-nav__submenu {
    display: none;
  }

  .site-nav__item.is-open .site-nav__submenu {
    display: block;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .site-nav__submenu a {
    white-space: normal;
    padding: 0.4rem 0.5rem;
  }
}

@media (max-width: 520px) {
  .site-header__shell {
    padding-left: 1rem;
    padding-right: 1rem;
  }

  .hero {
    padding-top: 1.25rem;
  }
}