/* ============================================================
   Smart Air-Quality Mesh — Atmospheric Instrument Panel
   Dependency-free design system (vanilla CSS).
   Type: Sora (display) + Spline Sans (body) + JetBrains Mono (data)
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Brand / signal */
  --color-primary: #2ee6c4;          /* luminous teal (from logo) */
  --color-primary-strong: #12c7a6;
  --color-secondary: #38bdf8;        /* sky cyan */
  --color-accent: #ffb347;           /* warm signal */

  /* Surfaces (deep atmosphere) */
  --bg-deep: #060b14;
  --bg: #0a121f;
  --bg-soft: #0f1b2d;
  --surface: #111e31;
  --surface-2: #16263d;
  --surface-border: rgba(120, 180, 220, 0.14);

  /* Ink */
  --ink: #eaf3fb;
  --ink-muted: #9fb4c9;
  --ink-faint: #6b8199;
  --color-headings: var(--ink);
  --color-body: var(--ink-muted);

  /* AQI scale (US EPA-style) */
  --aqi-good: #4ade80;
  --aqi-moderate: #facc15;
  --aqi-usg: #fb923c;        /* unhealthy for sensitive groups */
  --aqi-unhealthy: #f87171;
  --aqi-vunhealthy: #c084fc;
  --aqi-hazardous: #b45a7a;

  /* Effects */
  --radius: 18px;
  --radius-sm: 12px;
  --radius-lg: 28px;
  --shadow-soft: 0 18px 40px -22px rgba(0, 0, 0, 0.85);
  --shadow-glow: 0 0 0 1px rgba(46, 230, 196, 0.18), 0 22px 60px -28px rgba(46, 230, 196, 0.45);
  --ring: 0 0 0 3px rgba(46, 230, 196, 0.35);

  --container: 1180px;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);

  --font-display: "Sora", "Segoe UI", sans-serif;
  --font-body: "Spline Sans", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, monospace;
}

::selection {
  background: var(--color-primary);
  color: #042018;
}

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

html {
  font-size: 62.5%; /* 1rem = 10px, preserves legacy rem sizing */
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.7rem;
  line-height: 1.65;
  color: var(--color-body);
  background:
    radial-gradient(1100px 620px at 78% -8%, rgba(46, 230, 196, 0.16), transparent 60%),
    radial-gradient(900px 560px at 8% 8%, rgba(56, 189, 248, 0.13), transparent 58%),
    var(--bg);
  background-attachment: fixed;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

/* Subtle atmospheric grid texture overlay */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  background-image:
    linear-gradient(rgba(120, 180, 220, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(120, 180, 220, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 18%, #000 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(circle at 50% 18%, #000 0%, transparent 72%);
}

main,
header,
footer,
section {
  position: relative;
  z-index: 1;
}

/* ---------- Typography ---------- */
h1, h2, h3, h4, h5 {
  color: var(--color-headings);
  margin: 0 0 1.4rem;
  line-height: 1.08;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(3.8rem, 8vw, 6.4rem); font-weight: 800; }
h2 { font-size: clamp(2.8rem, 5vw, 4.2rem); }
h3 { font-size: clamp(2rem, 3vw, 2.6rem); font-weight: 600; margin-top: 1rem; }

p { margin: 0 0 1.6rem; }
strong { color: var(--ink); font-weight: 600; }

a {
  text-decoration: none;
  color: var(--color-primary);
}

::placeholder { color: var(--ink-faint); }

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

/* ---------- Skip link & accessibility ---------- */
.skip-link {
  position: absolute;
  left: 1rem;
  top: -200px;
  z-index: 999;
  background: var(--color-primary);
  color: #042018;
  padding: 1rem 1.6rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-family: var(--font-body);
  transition: top 0.2s var(--ease);
}
.skip-link:focus { top: 1rem; }

:where(a, button, input, textarea, summary, [tabindex]):focus-visible {
  outline: none;
  box-shadow: var(--ring);
  border-radius: 8px;
}

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

/* ---------- Layout primitives ---------- */
.container {
  max-width: var(--container);
  margin: 0 auto;
  padding-inline: 2.2rem;
}

.grid { display: grid; }

@media screen and (min-width: 820px) {
  .grid--1x2 { grid-template-columns: repeat(2, 1fr); }
}
@media screen and (min-width: 1024px) {
  .grid--1x3 { grid-template-columns: repeat(3, 1fr); }
}

/* ---------- Eyebrow / pill labels ---------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--color-primary);
  background: rgba(46, 230, 196, 0.08);
  border: 1px solid rgba(46, 230, 196, 0.25);
  padding: 0.55rem 1.4rem;
  border-radius: 999px;
  margin-bottom: 2rem;
}
.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--color-primary);
  box-shadow: 0 0 10px 2px var(--color-primary);
  animation: pulse 2.4s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.65); }
}

/* ---------- Buttons ---------- */
.btn {
  --btn-bg: var(--color-primary);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.9rem;
  font-family: var(--font-body);
  font-size: 1.6rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  padding: 1.5rem 3rem;
  border: 1px solid transparent;
  border-radius: 999px;
  cursor: pointer;
  white-space: nowrap;
  background: var(--btn-bg);
  color: #042018;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease),
              background-color 0.25s var(--ease), color 0.25s var(--ease);
}
.btn .icon { width: 2rem; height: 2rem; }

.btn--accent {
  background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
  color: #042018;
  box-shadow: 0 12px 34px -14px rgba(46, 230, 196, 0.7);
}
.btn--accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 20px 44px -14px rgba(46, 230, 196, 0.85);
}

.btn--primary { background: var(--color-primary); color: #042018; }
.btn--primary:hover { transform: translateY(-2px); background: var(--color-primary-strong); }

.btn--secondary {
  background: linear-gradient(135deg, var(--color-secondary), #6366f1);
  color: #fff;
}
.btn--secondary:hover { transform: translateY(-2px); filter: brightness(1.08); }

.btn--outline {
  background: rgba(255, 255, 255, 0.02);
  color: var(--ink);
  border: 1px solid var(--surface-border);
}
.btn--outline:hover {
  background: rgba(46, 230, 196, 0.1);
  border-color: rgba(46, 230, 196, 0.5);
  color: var(--ink);
  transform: translateY(-2px);
}

.btn:not(.btn--accent):not(.btn--outline):not(.btn--primary):not(.btn--secondary) {
  background: var(--surface-2);
  color: var(--ink);
  border: 1px solid var(--surface-border);
}
.btn:not(.btn--accent):not(.btn--outline):not(.btn--primary):not(.btn--secondary):hover {
  background: var(--surface);
  transform: translateY(-2px);
}

.btn--stretched { padding-inline: 4.5rem; }
.btn--block { width: 100%; }

/* ---------- Inputs ---------- */
.input,
.input.input { /* boost specificity to override scattered inline styles */
  width: 100%;
  font-family: var(--font-body);
  font-size: 1.6rem;
  color: var(--ink);
  background: rgba(6, 12, 22, 0.6);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 1.3rem 1.6rem;
  outline: 0;
  transition: border-color 0.2s var(--ease), box-shadow 0.2s var(--ease), background 0.2s var(--ease);
}
.input:focus {
  border-color: var(--color-primary);
  box-shadow: var(--ring);
  background: rgba(6, 12, 22, 0.85);
}
textarea.input { resize: vertical; min-height: 12rem; font-family: var(--font-mono); font-size: 1.4rem; }

/* ---------- Link arrow ---------- */
.link-arrow {
  display: inline-flex;
  align-items: center;
  color: var(--color-primary);
  font-weight: 600;
  font-size: 1.6rem;
}
.link-arrow::after {
  content: "→";
  margin-left: 0.7rem;
  transition: transform 0.2s var(--ease);
}
.link-arrow:hover::after { transform: translateX(6px); }

/* ---------- Icons ---------- */
.icon { width: 40px; height: 40px; }
.icon--small { width: 30px; height: 30px; }
.icon--primary { fill: var(--color-primary); }
.icon--white { fill: #fff; }

.icon-container {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 58px; height: 58px;
  border-radius: 16px;
  background: rgba(46, 230, 196, 0.1);
  border: 1px solid rgba(46, 230, 196, 0.25);
}

/* ---------- Lists ---------- */
.list { list-style: none; padding-left: 0; margin: 0; color: var(--ink); }
.list--inline .list__item { display: inline-block; margin-right: 2rem; }
.list--tick { list-style-image: url(../../images/tick.svg); padding-left: 3rem; }
.list--tick .list__item { padding-left: 0.5rem; margin-bottom: 1rem; }

/* ============================================================
   Navigation
   ============================================================ */
header {
  position: sticky;
  top: 0;
  z-index: 50;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  padding: 1.4rem 2.2rem;
  max-width: var(--container);
  margin: 0 auto;
  background: rgba(8, 15, 26, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--surface-border);
}
header::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: rgba(8, 15, 26, 0.72);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--surface-border);
}

.nav__brand {
  display: inline-flex;
  align-items: center;
  gap: 1.1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.9rem;
  color: var(--ink);
  letter-spacing: -0.01em;
}
.nav__brand img {
  width: 38px; height: 38px;
  filter: drop-shadow(0 0 12px rgba(46, 230, 196, 0.5));
}
.nav__brand-text { white-space: nowrap; }

.nav__list {
  display: flex;
  flex-direction: column;
  width: 100%;
  margin: 0;
  gap: 0.2rem;
}
.nav__item { padding: 0.4rem 0; }
.nav__item > a {
  display: block;
  padding: 1rem 0.6rem;
  color: var(--ink-muted);
  font-weight: 500;
  border-radius: 8px;
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav__item > a:hover { color: var(--ink); background: rgba(255, 255, 255, 0.04); }

/* Hamburger toggler */
.nav__toggler {
  display: inline-flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px; height: 44px;
  padding: 10px;
  border: 1px solid var(--surface-border);
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  cursor: pointer;
  transition: box-shadow 0.2s var(--ease);
}
.nav__toggler span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav.collapsible--expanded .nav__toggler span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav.collapsible--expanded .nav__toggler span:nth-child(2) { opacity: 0; }
.nav.collapsible--expanded .nav__toggler span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media screen and (min-width: 820px) {
  .nav__toggler { display: none; }
  .nav__list {
    flex-direction: row;
    align-items: center;
    width: auto;
    gap: 0.6rem;
    max-height: none !important;
    opacity: 1 !important;
  }
  .nav__item > a { padding: 0.8rem 1.3rem; }
}

/* ============================================================
   Collapsible (footer + nav) — JS toggles --expanded
   ============================================================ */
.collapsible__header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}
.collapsible__heading { margin: 0; font-size: 1.9rem; }
.collapsible__search { transition: transform 0.3s var(--ease); fill: var(--color-primary); }
.collapsible__content {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.35s var(--ease), opacity 0.35s var(--ease);
}
.collapsible--expanded .collapsible__search { transform: rotate(-180deg); }
.collapsible--expanded .collapsible__content { max-height: 100vh; opacity: 1; }

/* ============================================================
   Block / sections
   ============================================================ */
.block {
  --padding-vertical: 7rem;
  padding: var(--padding-vertical) 0;
}
.block__header { text-align: center; margin-bottom: 4.5rem; }
.block__header > p {
  color: var(--ink-muted);
  max-width: 62ch;
  margin-inline: auto;
  font-size: 1.8rem;
}
.block__heading { margin-top: 0; }

.block--dark { background: transparent; }

/* ============================================================
   Hero
   ============================================================ */
.hero {
  padding-top: 4rem;
  overflow: hidden;
}
.hero .grid {
  align-items: center;
  gap: 4rem;
}
.hero__content { text-align: left; }
.hero__title-grad {
  background: linear-gradient(120deg, var(--color-primary) 10%, var(--color-secondary) 90%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.hero__tagline {
  font-size: clamp(1.7rem, 2.4vw, 2rem);
  color: var(--ink-muted);
  max-width: 54ch;
  margin: 2.4rem 0 3rem;
}
.hero__cta { display: flex; flex-wrap: wrap; gap: 1.2rem; align-items: center; }
.hero__metrics {
  display: flex;
  flex-wrap: wrap;
  gap: 2.6rem;
  margin-top: 4rem;
  padding-top: 3rem;
  border-top: 1px solid var(--surface-border);
}
.hero__metric { display: flex; flex-direction: column; }
.hero__metric-value {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  color: var(--ink);
  line-height: 1;
}
.hero__metric-label {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--ink-faint);
  margin-top: 0.6rem;
}

.hero__visual { position: relative; }
.hero__img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-soft);
}

/* Floating AQI readout card on hero */
.hero__chip {
  position: absolute;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.6rem;
  border-radius: 16px;
  background: rgba(10, 18, 31, 0.82);
  border: 1px solid var(--surface-border);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: var(--shadow-soft);
  animation: float 6s var(--ease) infinite;
}
.hero__chip--good { left: -1.2rem; bottom: 3rem; }
.hero__chip--moderate { right: -1rem; top: 2.4rem; animation-delay: -3s; }
.hero__chip-dot { width: 14px; height: 14px; border-radius: 50%; }
.hero__chip--good .hero__chip-dot { background: var(--aqi-good); box-shadow: 0 0 12px var(--aqi-good); }
.hero__chip--moderate .hero__chip-dot { background: var(--aqi-moderate); box-shadow: 0 0 12px var(--aqi-moderate); }
.hero__chip-value { font-family: var(--font-mono); font-weight: 700; color: var(--ink); font-size: 1.7rem; line-height: 1.1; }
.hero__chip-label { font-size: 1.1rem; color: var(--ink-faint); letter-spacing: 0.06em; }
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-12px); }
}

@media screen and (max-width: 819px) {
  .hero__chip { display: none; }
}

/* ============================================================
   AQI scale strip
   ============================================================ */
.aqi-scale {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.2rem;
  margin-top: 2rem;
}
.aqi-band {
  position: relative;
  padding: 1.6rem 1.6rem 1.6rem 2rem;
  border-radius: var(--radius-sm);
  background: var(--surface);
  border: 1px solid var(--surface-border);
  overflow: hidden;
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease);
}
.aqi-band::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 6px;
  background: var(--band-color);
  box-shadow: 0 0 18px 1px var(--band-color);
}
.aqi-band:hover { transform: translateY(-4px); border-color: var(--band-color); }
.aqi-band__range { font-family: var(--font-mono); font-size: 1.3rem; color: var(--band-color); font-weight: 700; }
.aqi-band__name { font-family: var(--font-display); font-weight: 600; color: var(--ink); font-size: 1.7rem; margin-top: 0.4rem; }
.aqi-band__desc { font-size: 1.4rem; color: var(--ink-muted); margin: 0.4rem 0 0; }

.aqi-band--good { --band-color: var(--aqi-good); }
.aqi-band--moderate { --band-color: var(--aqi-moderate); }
.aqi-band--usg { --band-color: var(--aqi-usg); }
.aqi-band--unhealthy { --band-color: var(--aqi-unhealthy); }
.aqi-band--vunhealthy { --band-color: var(--aqi-vunhealthy); }
.aqi-band--hazardous { --band-color: var(--aqi-hazardous); }

@media screen and (min-width: 700px) {
  .aqi-scale { grid-template-columns: repeat(3, 1fr); }
}

/* ============================================================
   Feature blocks
   ============================================================ */
.feature {
  gap: 3rem 4rem;
  margin: 6rem 0;
  align-items: center;
}
.feature:first-of-type { margin-top: 2rem; }
.feature__heading { margin: 1rem 0; }
.feature__content {
  background: linear-gradient(180deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-soft);
}
.feature__content p { color: var(--ink-muted); }
.feature__img {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-soft);
}

@media screen and (min-width: 820px) {
  .feature:nth-of-type(even) .feature__content { order: 2; }
}

/* ============================================================
   Showcase block (Insights Dashboard)
   ============================================================ */
.block-showcase .grid { align-items: center; gap: 4rem; }
.block-showcase__image {
  width: 100%;
  border-radius: var(--radius-lg);
  border: 1px solid var(--surface-border);
  box-shadow: var(--shadow-glow);
}
.block-showcase .list { display: grid; gap: 1.2rem; }

.media {
  display: flex;
  gap: 1.6rem;
  padding: 1.8rem;
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--surface-border);
  transition: transform 0.25s var(--ease), border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.media:hover {
  transform: translateY(-3px);
  border-color: rgba(46, 230, 196, 0.4);
  background: rgba(46, 230, 196, 0.04);
}
.media__title { margin: 0 0 0.5rem; font-size: 2rem; color: var(--color-primary); }
.media__body { margin: 0; }
.media__body p { color: var(--ink-muted); margin: 0; }
.media__image {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 14px;
  background: rgba(46, 230, 196, 0.1);
  border: 1px solid rgba(46, 230, 196, 0.25);
}
.media__image .icon { width: 28px; height: 28px; }

@media screen and (min-width: 820px) {
  .block-showcase .grid { grid-template-columns: 1fr 1fr; }
}

/* ============================================================
   Hedera integration panel
   ============================================================ */
.hedera-panel {
  display: grid;
  gap: 2.4rem;
  align-items: start;
}
@media screen and (min-width: 880px) {
  .hedera-panel { grid-template-columns: 1.1fr 0.9fr; }
}

.panel {
  background: linear-gradient(180deg, var(--surface), var(--bg-soft));
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 3rem;
  box-shadow: var(--shadow-soft);
}
.panel__head {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  margin-bottom: 2rem;
}
.panel__title { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 1.9rem; }
.panel__subtitle { font-size: 1.4rem; color: var(--ink-faint); font-family: var(--font-mono); }

.form-grid { display: grid; gap: 1.4rem; }
.btn-row { display: flex; flex-wrap: wrap; gap: 1rem; }

.feedback { margin-top: 1.6rem; min-height: 2rem; font-size: 1.5rem; }
.muted { color: var(--ink-faint); }

.card {
  background: var(--surface);
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-lg);
  padding: 2.4rem;
  box-shadow: var(--shadow-soft);
}
.card__title { margin: 0 0 1.4rem; font-size: 1.9rem; color: var(--ink); }

.proof-grid { display: grid; gap: 1rem; }
.proof-label { font-weight: 600; font-size: 1.4rem; color: var(--ink); font-family: var(--font-mono); letter-spacing: 0.04em; }
.proof-value { color: var(--ink-muted); font-family: var(--font-mono); font-size: 1.4rem; }
.proof-meta { display: flex; flex-wrap: wrap; gap: 2.4rem; margin-top: 0.6rem; }

pre,
.code-out {
  margin: 0;
  background: rgba(6, 12, 22, 0.75);
  border: 1px solid var(--surface-border);
  padding: 1.2rem 1.4rem;
  border-radius: var(--radius-sm);
  white-space: pre-wrap;
  word-break: break-all;
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--color-primary);
}

.recent-proof-list { max-height: 18rem; overflow: auto; margin-top: 0.6rem; }
.recent-table { width: 100%; border-collapse: collapse; font-size: 1.4rem; font-family: var(--font-mono); }
.recent-table td { padding: 0.7rem 0; border-bottom: 1px solid var(--surface-border); color: var(--ink-muted); }

details {
  margin-top: 1.8rem;
  border: 1px solid var(--surface-border);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.8rem;
  background: rgba(255, 255, 255, 0.02);
}
summary { cursor: pointer; font-weight: 600; color: var(--ink); font-family: var(--font-display); }
details .list { margin-top: 1rem; padding-left: 1.8rem; list-style: disc; color: var(--ink-muted); }
details .list li { margin: 0.5rem 0; }
details code {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  background: rgba(46, 230, 196, 0.1);
  color: var(--color-primary);
  padding: 0.1rem 0.6rem;
  border-radius: 6px;
}
.is-hidden { visibility: hidden; }

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: linear-gradient(180deg, transparent, rgba(4, 8, 16, 0.85));
  border-top: 1px solid var(--surface-border);
  padding: 6rem 0 3rem;
}
.footer__sections {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.4rem;
}
.footer__section { padding-bottom: 2rem; border-bottom: 1px solid var(--surface-border); }
.footer__heading {
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 1.4rem;
  color: var(--ink);
  font-family: var(--font-mono);
}
.footer a { color: var(--ink-faint); transition: color 0.2s var(--ease); }
.footer a:hover { color: var(--color-primary); }
.footer .list { display: grid; gap: 1rem; }
.footer__brand { text-align: left; }
.footer__brand-row { display: inline-flex; align-items: center; gap: 1rem; margin-bottom: 1rem; }
.footer__brand-row img { width: 34px; height: 34px; filter: drop-shadow(0 0 10px rgba(46,230,196,0.5)); }
.footer__brand-name { font-family: var(--font-display); font-weight: 700; color: var(--ink); font-size: 1.8rem; }
.footer__copyright,
.footer__copryright { font-size: 1.4rem; color: var(--ink-faint); }

@media screen and (min-width: 768px) {
  .footer__sections { grid-template-columns: 2fr 1fr 1fr 1fr; gap: 3rem; }
  .footer__section { border: 0; padding-bottom: 0; }
  .footer .collapsible__search { display: none; }
  .footer .collapsible__content { opacity: 1; max-height: none; }
  .footer__brand { order: -1; }
}

/* ============================================================
   Scroll reveal (vanilla, replaces AOS)
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* Legacy AOS hooks degrade gracefully (no-op visible) if AOS absent */
[data-aos] { opacity: 1; }

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}