:root {

  --bg-0: #0b1020;
  --text: #eef1ff;
  --text-muted: rgba(238, 241, 255, 0.72);
  --accent-violet: #8b5cf6;
  --accent-cyan: #22d3ee;
  --accent-pink: #f472b6;

  --glass-bg: rgba(255, 255, 255, 0.07);
  --glass-bg-strong: rgba(255, 255, 255, 0.1);
  --glass-border: rgba(255, 255, 255, 0.14);
  --glass-blur: 18px;

  --radius-lg: 26px;
  --radius-md: 18px;
  --container: 1200px;
  --pad-x: 32px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  background-color: var(--bg-0);
  background-image:
    radial-gradient(1100px 620px at 8% -12%, rgba(139, 92, 246, 0.55), transparent 60%),
    radial-gradient(900px 680px at 112% 8%, rgba(34, 211, 238, 0.42), transparent 55%),
    radial-gradient(1000px 780px at 50% 118%, rgba(244, 114, 182, 0.38), transparent 60%),
    linear-gradient(165deg, #0b1020 0%, #141a35 48%, #0c1126 100%);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  line-height: 1.65;
}

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

a {
  color: inherit;
}

h1,
h2,
h3,
p,
ul,
ol,
figure,
pre {
  margin: 0;
}

ul,
ol {
  padding: 0;
  list-style: none;
}

code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
}

:focus-visible {
  outline: 3px solid var(--accent-cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

section[id],
main[id] {
  scroll-margin-top: 120px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--pad-x);
}

.glass {
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(150%);
  box-shadow:
    0 18px 44px rgba(4, 8, 22, 0.38),
    inset 0 1px 0 rgba(255, 255, 255, 0.14);
}

.eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent-cyan);
  margin-bottom: 14px;
}

.gradient-text {
  background: linear-gradient(100deg, var(--accent-cyan) 0%, var(--accent-violet) 55%, var(--accent-pink) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

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

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
  animation: float 18s ease-in-out infinite;
}

.orb--violet {
  width: 420px;
  height: 420px;
  top: -80px;
  left: -60px;
  background: var(--accent-violet);
}

.orb--cyan {
  width: 360px;
  height: 360px;
  top: 34%;
  right: -100px;
  background: var(--accent-cyan);
  animation-delay: -6s;
}

.orb--pink {
  width: 460px;
  height: 460px;
  bottom: -140px;
  left: 30%;
  background: var(--accent-pink);
  animation-delay: -11s;
}

@keyframes float {
  0%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  50% {
    transform: translate3d(30px, -40px, 0) scale(1.12);
  }
}

.site-header,
main,
.site-footer,
.toggle-btn {
  position: relative;
  z-index: 1;
}

.site-header {
  z-index: 50;
}

.site-header {
  position: sticky;
  top: 0;
  padding-top: 20px;
}

.nav-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 12px 22px;
  border-radius: 999px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  font-family: "Sora", "Inter", sans-serif;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 11px;
  font-size: 1.1rem;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--accent-violet), var(--accent-cyan));
  box-shadow: 0 8px 18px rgba(139, 92, 246, 0.45);
}

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

.nav-links {
  display: flex;
  align-items: center;
  gap: 26px;
}

.nav-links a {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-muted);
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease;
}

.nav-links a:hover {
  color: #fff;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.82rem;
  font-weight: 600;
  white-space: nowrap;
  color: #c9fbe9;
  background: rgba(52, 211, 153, 0.14);
  border: 1px solid rgba(52, 211, 153, 0.4);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #34d399;
  box-shadow: 0 0 0 4px rgba(52, 211, 153, 0.22);
}

.status-sep {
  opacity: 0.5;
}

.status-width {
  font-variant-numeric: tabular-nums;
  opacity: 0.85;
}

.hero {
  padding-block: 92px 56px;
  text-align: center;
}

.hero .eyebrow {
  padding: 7px 16px;
  border-radius: 999px;
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.hero h1 {
  max-width: 17ch;
  margin-inline: auto;
  font-family: "Sora", "Inter", sans-serif;
  font-size: 3.4rem;
  line-height: 1.08;
  font-weight: 800;
  letter-spacing: -0.035em;
  text-wrap: balance;
}

.lead {
  max-width: 62ch;
  margin: 22px auto 0;
  font-size: 1.2rem;
  color: var(--text-muted);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-top: 32px;
}

.chip {
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.86rem;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.section {
  padding-block: 72px;
}

.section-head {
  max-width: 760px;
  margin-bottom: 34px;
}

.section-title {
  font-family: "Sora", "Inter", sans-serif;
  font-size: 2.1rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.15;
}

.section-title code {
  font-size: 0.9em;
  padding: 2px 10px;
  border-radius: 9px;
  color: var(--accent-cyan);
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.section-sub {
  margin-top: 14px;
  font-size: 1.05rem;
  color: var(--text-muted);
}

.info-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 28px;
  align-items: start;
}

.info-card {
  padding: 34px;
  border-radius: var(--radius-lg);
}

.info-card p {
  font-size: 1.05rem;
  color: var(--text-muted);
}

.info-card p + p {
  margin-top: 16px;
}

.info-card strong {
  color: var(--text);
}

.info-card code,
.card code,
.step code,
.term code {
  font-size: 0.9em;
  padding: 2px 7px;
  border-radius: 7px;
  color: #ffe08a;
  background: rgba(255, 224, 138, 0.12);
  border: 1px solid rgba(255, 224, 138, 0.28);
}

.def-list {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.def-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.def-item code {
  font-size: 0.88rem;
  font-weight: 600;
  padding: 3px 9px;
  color: var(--accent-cyan);
  background: rgba(34, 211, 238, 0.12);
  border: 1px solid rgba(34, 211, 238, 0.3);
}

.def-item span {
  flex: 1 1 220px;
  font-size: 0.95rem;
  color: var(--text-muted);
}

.info-note {
  margin-top: 24px;
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(139, 92, 246, 0.14);
  border: 1px solid rgba(139, 92, 246, 0.35);
}

.code-card {
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: rgba(8, 12, 26, 0.72);
}

.code-head {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 14px 18px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.04);
}

.code-dot {
  width: 11px;
  height: 11px;
  border-radius: 50%;
}

.code-dot--red {
  background: #ff5f57;
}

.code-dot--yellow {
  background: #febc2e;
}

.code-dot--green {
  background: #28c840;
}

.code-file {
  margin-left: 8px;
  font-size: 0.8rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}

.code-card pre {
  margin: 0;
  padding: 22px;
  overflow-x: auto;
  font-size: 0.95rem;
  line-height: 1.7;
}

.code-card code {
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", Menlo, monospace;
  color: #dbe4ff;
}

.c-com  { color: #6b7a99; font-style: italic; }
.c-kw   { color: #ff7edb; font-weight: 600; }
.c-sel  { color: #7ee0ff; }
.c-prop { color: #c7a6ff; }
.c-val  { color: #8ef0c0; }
.c-num  { color: #ffd166; }

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 24px;
  border-radius: var(--radius-lg);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.card:hover {
  transform: translateY(-6px);
  background: var(--glass-bg-strong);
  border-color: rgba(255, 255, 255, 0.3);
}

.card-icon {
  display: grid;
  place-items: center;
  width: 54px;
  height: 54px;
  font-size: 1.5rem;
  border-radius: 17px;
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.35), rgba(34, 211, 238, 0.3));
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.card h3 {
  font-family: "Sora", "Inter", sans-serif;
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.card p {
  font-size: 0.98rem;
  color: var(--text-muted);
}

.card-tag {
  margin-top: auto;
  padding-top: 8px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

.steps {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 22px;
  counter-reset: step;
}

.step {
  position: relative;
  padding: 26px 24px;
  border-radius: var(--radius-lg);
}

.step-num {
  display: block;
  margin-bottom: 14px;
  font-family: "Sora", "Inter", sans-serif;
  font-size: 1.6rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  background: linear-gradient(120deg, var(--accent-cyan), var(--accent-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.step h3 {
  font-family: "Sora", "Inter", sans-serif;
  font-size: 1.08rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.97rem;
  color: var(--text-muted);
}

.analogy {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-top: 26px;
  padding: 18px 20px;
  border-radius: var(--radius-md);
  background: rgba(34, 211, 238, 0.1);
  border: 1px solid rgba(34, 211, 238, 0.32);
}

.analogy-mark {
  font-size: 1.2rem;
  line-height: 1.5;
}

.analogy p {
  font-size: 0.98rem;
  color: var(--text-muted);
}

.analogy strong {
  color: var(--text);
}

.analogy em {
  font-style: normal;
  font-weight: 700;
  color: #9be7ff;
}

.legend {
  padding: 18px 22px 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  background: rgba(255, 255, 255, 0.03);
}

.legend h4 {
  margin-bottom: 14px;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-cyan);
}

.legend ol {
  display: grid;
  gap: 14px;
  counter-reset: leg;
}

.legend li {
  position: relative;
  padding-left: 28px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.legend li::before {
  counter-increment: leg;
  content: counter(leg);
  position: absolute;
  left: 0;
  top: 2px;
  display: grid;
  place-items: center;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  font-size: 0.7rem;
  font-weight: 700;
  color: #0b1020;
  background: var(--accent-cyan);
}

.code-card .legend li > code {
  display: block;
  margin-bottom: 6px;
  padding: 7px 10px;
  border-radius: 9px;
  font-size: 0.82rem;
  color: #7ee0ff;
  background: rgba(126, 224, 255, 0.1);
  border: 1px solid rgba(126, 224, 255, 0.24);
  overflow-x: auto;
}

.code-card .legend li span code {
  padding: 1px 6px;
  border-radius: 6px;
  font-size: 0.86em;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.16);
}

.hero-hint {
  display: block;
  max-width: 64ch;
  margin: 34px auto 0;
  padding: 16px 22px;
  border-radius: var(--radius-md);
  font-size: 0.98rem;
  text-align: left;
  color: var(--text-muted);
  background: var(--glass-bg);
  border: 1px solid var(--glass-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.hero-hint strong {
  color: var(--text);
}

.hero-hint-icon {
  margin-right: 8px;
  font-size: 1.05rem;
}

.glossary-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.term {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border-radius: var(--radius-lg);
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}

.term:hover {
  transform: translateY(-4px);
  background: var(--glass-bg-strong);
  border-color: rgba(255, 255, 255, 0.3);
}

.term h3 {
  font-family: "Sora", "Inter", sans-serif;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.term-aka {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--accent-cyan);
}

.term-def {
  font-size: 0.95rem;
  color: var(--text-muted);
}

.term-tip {
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px dashed rgba(255, 255, 255, 0.2);
  font-size: 0.9rem;
  color: rgba(238, 241, 255, 0.85);
}

.term-tip strong {
  display: block;
  margin-bottom: 4px;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-pink);
}

.site-footer {
  padding: 20px 0 120px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  padding: 20px 26px;
  border-radius: var(--radius-lg);
  font-size: 0.95rem;
  color: var(--text-muted);
}

.footer-inner strong {
  color: var(--text);
}

.footer-hint {
  font-size: 0.88rem;
  opacity: 0.8;
}

.toggle-btn {
  position: fixed;
  right: 26px;
  bottom: 26px;
  z-index: 80;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 16px 26px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  cursor: pointer;
  border: 1px solid rgba(255, 255, 255, 0.4);
  border-radius: 999px;
  background: linear-gradient(135deg, #7c3aed 0%, #0ea5e9 100%);
  box-shadow:
    0 16px 36px rgba(4, 8, 22, 0.55),
    inset 0 1px 0 rgba(255, 255, 255, 0.35);
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.4s ease;
}

.toggle-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 44px rgba(4, 8, 22, 0.6);
}

.toggle-btn:active {
  transform: translateY(0) scale(0.98);
}

.toggle-btn::after {
  content: "";
  position: absolute;
  inset: -5px;
  border-radius: inherit;
  border: 2px solid rgba(255, 255, 255, 0.45);
  animation: pulse 2.6s ease-out infinite;
  pointer-events: none;
}

@keyframes pulse {
  0%   { transform: scale(0.96); opacity: 0.75; }
  70%  { transform: scale(1.18); opacity: 0; }
  100% { transform: scale(1.18); opacity: 0; }
}

.toggle-btn[data-state="off"] {
  background: linear-gradient(135deg, #f97316 0%, #ef4444 100%);
}

.btn-icon {
  flex: none;
}

.status-pill[data-state="off"] {
  color: #ffe4e0;
  background: rgba(255, 92, 92, 0.16);
  border-color: rgba(255, 120, 120, 0.45);
}

.status-pill[data-state="off"] .status-dot {
  background: #ff6b6b;
  box-shadow: 0 0 0 4px rgba(255, 107, 107, 0.22);
}

.notice {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-top: 8px;
  padding: 16px 20px;
  border-radius: var(--radius-md);
  color: #ffe4e0;
  background: rgba(255, 92, 92, 0.14);
  border: 1px solid rgba(255, 140, 140, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
}

.notice[hidden] {
  display: none;
}

.notice-icon {
  font-size: 1.15rem;
  line-height: 1.4;
}

.notice p {
  font-size: 0.97rem;
  line-height: 1.55;
}

body.just-toggled main {
  animation: flash 0.45s ease;
}

@keyframes flash {
  from { filter: brightness(1.45); }
  to   { filter: brightness(1); }
}

@media (max-width: 1024px) {
  body.responsive-active {
    --pad-x: 26px;
  }

  body.responsive-active .hero {
    padding-block: 72px 44px;
  }

  body.responsive-active .hero h1 {
    font-size: 2.7rem;
  }

  body.responsive-active .lead {
    font-size: 1.1rem;
  }

  body.responsive-active .section {
    padding-block: 56px;
  }

  body.responsive-active .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }

  body.responsive-active .glossary-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body.responsive-active .steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  body.responsive-active .nav-links {
    gap: 18px;
  }
}

@media (max-width: 860px) {
  body.responsive-active .info-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

@media (max-width: 768px) {
  body.responsive-active {
    --pad-x: 20px;
  }

  body.responsive-active .site-header {
    padding-top: 14px;
  }

  body.responsive-active .nav-bar {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
    padding: 14px 16px;
    border-radius: 24px;
    text-align: center;
  }

  body.responsive-active .brand {
    justify-content: center;
  }

  body.responsive-active .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px 16px;
  }

  body.responsive-active .nav-links a {
    font-size: 0.9rem;
  }

  body.responsive-active .status-pill {
    align-self: center;
    font-size: 0.78rem;
  }

  body.responsive-active .hero {
    padding-block: 52px 34px;
  }

  body.responsive-active .hero h1 {
    font-size: 2.15rem;
    letter-spacing: -0.02em;
  }

  body.responsive-active .lead {
    font-size: 1.02rem;
    margin-top: 16px;
  }

  body.responsive-active .chips {
    margin-top: 24px;
    gap: 8px;
  }

  body.responsive-active .chip {
    padding: 7px 14px;
    font-size: 0.8rem;
  }

  body.responsive-active .section {
    padding-block: 46px;
  }

  body.responsive-active .section-head {
    margin-bottom: 24px;
  }

  body.responsive-active .section-title {
    font-size: 1.6rem;
  }

  body.responsive-active .section-sub {
    font-size: 0.98rem;
    margin-top: 10px;
  }

  body.responsive-active .card-grid {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  body.responsive-active .card {
    flex-direction: row;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 16px;
    padding: 20px;
  }

  body.responsive-active .card-icon {
    width: 46px;
    height: 46px;
    font-size: 1.25rem;
  }

  body.responsive-active .card h3 {
    font-size: 1.05rem;
  }

  body.responsive-active .card p {
    flex: 1 1 100%;
    font-size: 0.93rem;
  }

  body.responsive-active .card-tag {
    flex: 1 1 100%;
    margin-top: 0;
    padding-top: 0;
  }

  body.responsive-active .info-card {
    padding: 22px;
  }

  body.responsive-active .info-card p {
    font-size: 0.98rem;
  }

  body.responsive-active .analogy {
    gap: 10px;
    margin-top: 20px;
    padding: 14px 16px;
  }

  body.responsive-active .analogy p {
    font-size: 0.93rem;
  }

  body.responsive-active .hero-hint {
    margin-top: 26px;
    padding: 14px 16px;
    font-size: 0.93rem;
  }

  body.responsive-active .legend {
    padding: 14px 16px 18px;
  }

  body.responsive-active .legend li {
    padding-left: 26px;
    font-size: 0.87rem;
  }

  body.responsive-active .code-card .legend li > code {
    font-size: 0.78rem;
  }

  body.responsive-active .code-card pre {
    padding: 16px;
    font-size: 0.85rem;
  }

  body.responsive-active .glossary-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  body.responsive-active .term {
    padding: 18px;
  }

  body.responsive-active .steps {
    grid-template-columns: 1fr;
    gap: 16px;
  }

  body.responsive-active .step {
    padding: 20px;
  }

  body.responsive-active .footer-inner {
    flex-direction: column;
    text-align: center;
    padding: 18px 20px;
  }

  body.responsive-active .site-footer {
    padding-bottom: 130px;
  }

  body.responsive-active .toggle-btn {
    right: 18px;
    bottom: 18px;
    padding: 14px 20px;
    font-size: 0.93rem;
    gap: 8px;
  }
}

@media (max-width: 480px) {
  body.responsive-active {
    --pad-x: 16px;
  }

  body.responsive-active .hero {
    padding-block: 40px 28px;
  }

  body.responsive-active .hero h1 {
    font-size: 1.85rem;
  }

  body.responsive-active .lead {
    font-size: 0.96rem;
  }

  body.responsive-active .section {
    padding-block: 36px;
  }

  body.responsive-active .section-title {
    font-size: 1.4rem;
  }

  body.responsive-active .brand-name {
    font-size: 0.98rem;
  }

  body.responsive-active .status-width {
    display: none;
  }

  body.responsive-active .status-sep {
    display: none;
  }

  body.responsive-active .def-item {
    padding: 12px 14px;
  }

  body.responsive-active .card {
    padding: 18px;
  }

  body.responsive-active .notice {
    padding: 14px 16px;
    font-size: 0.92rem;
  }

  body.responsive-active .term {
    padding: 16px;
  }

  body.responsive-active .term h3 {
    font-size: 0.98rem;
  }

  body.responsive-active .hero-hint {
    padding: 12px 14px;
    font-size: 0.9rem;
  }

  body.responsive-active .legend li {
    font-size: 0.84rem;
  }

  body.responsive-active .code-card .legend li > code {
    font-size: 0.74rem;
    padding: 6px 8px;
  }

  body.responsive-active .toggle-btn {
    left: 16px;
    right: 16px;
    bottom: 16px;
    justify-content: center;
    padding: 16px 18px;
    font-size: 0.98rem;
  }
}

@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;
  }
}