/* ========================================================================
   WEB3CO2 — design system
   Dark sustainability theme · glassmorphism · validated categorical palette
   ===================================================================== */
:root {
  /* surfaces */
  --bg: #06100a;
  --bg-2: #081409;
  --surface: rgba(18, 36, 28, 0.66);
  --surface-solid: #0f2016;
  --surface-2: #142c20;
  --line: rgba(126, 224, 170, 0.14);
  --line-strong: rgba(126, 224, 170, 0.28);

  /* ink */
  --text: #eaf6ee;
  --muted: #9fbdac;
  --faint: #6d8a79;

  /* brand + categorical (validated: CVD ΔE ≥ 23 on dark surface) */
  --green: #34e07f;
  --green-deep: #12b866;
  --green-glow: rgba(52, 224, 127, 0.35);
  --btc: #f7931a;
  --bsv: #34e07f;
  --bch: #4b9bff;

  /* status */
  --amber: #ffb838;
  --red: #ff6b6b;

  --radius: 18px;
  --radius-sm: 12px;
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.7);
  --shadow-glow: 0 0 40px -8px var(--green-glow);

  --font: "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --font-display: "Space Grotesk", var(--font);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
}
body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}
h1,
h2,
h3,
h4 {
  font-family: var(--font-display);
  line-height: 1.1;
  margin: 0 0 0.5em;
  letter-spacing: -0.02em;
  font-weight: 600;
}
a {
  color: var(--green);
  text-decoration: none;
}
section {
  position: relative;
  padding: 5.5rem 1.5rem;
  max-width: 1180px;
  margin: 0 auto;
  z-index: 1;
}

/* --------------------------- aurora backdrop ------------------------- */
.aurora {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: hidden;
  pointer-events: none;
}
.aurora-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
  animation: drift 22s var(--ease) infinite alternate;
}
.aurora-blob.a1 {
  width: 46vw;
  height: 46vw;
  top: -12vw;
  left: -8vw;
  background: radial-gradient(circle, #14c46e, transparent 65%);
}
.aurora-blob.a2 {
  width: 40vw;
  height: 40vw;
  top: 8vw;
  right: -10vw;
  background: radial-gradient(circle, #0a8f7a, transparent 65%);
  animation-delay: -6s;
}
.aurora-blob.a3 {
  width: 38vw;
  height: 38vw;
  bottom: -14vw;
  left: 30vw;
  background: radial-gradient(circle, #1f9d55, transparent 65%);
  animation-delay: -12s;
  opacity: 0.35;
}
@keyframes drift {
  0% {
    transform: translate(0, 0) scale(1);
  }
  100% {
    transform: translate(6vw, 5vw) scale(1.15);
  }
}
.grid-overlay {
  position: absolute;
  inset: 0;
  background-image: linear-gradient(rgba(126, 224, 170, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(126, 224, 170, 0.045) 1px, transparent 1px);
  background-size: 54px 54px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 40%, transparent 85%);
}
@media (prefers-reduced-motion: reduce) {
  .aurora-blob {
    animation: none;
  }
}

/* ------------------------------- header ------------------------------ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.75rem;
  background: rgba(6, 16, 10, 0.55);
  backdrop-filter: blur(16px) saturate(1.4);
  border-bottom: 1px solid var(--line);
}
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--text);
}
.brand-mark {
  font-size: 1.35rem;
  filter: drop-shadow(0 0 10px var(--green-glow));
}
.brand-name span {
  color: var(--green);
}
.nav {
  display: flex;
  gap: 1.6rem;
  font-size: 0.94rem;
  font-weight: 500;
}
.nav a {
  color: var(--muted);
  transition: color 0.2s;
  position: relative;
}
.nav a:hover {
  color: var(--text);
}
.nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0;
  height: 2px;
  border-radius: 2px;
  background: var(--green);
  transition: width 0.25s var(--ease);
}
.nav a:hover::after {
  width: 100%;
}
.live-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--green);
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  background: rgba(52, 224, 127, 0.06);
}
.live-pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 0 var(--green-glow);
  animation: pulse 2s infinite;
}
@keyframes pulse {
  0% {
    box-shadow: 0 0 0 0 var(--green-glow);
  }
  70% {
    box-shadow: 0 0 0 9px rgba(52, 224, 127, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(52, 224, 127, 0);
  }
}

/* -------------------------------- hero ------------------------------- */
.hero {
  text-align: center;
  padding-top: 5rem;
  padding-bottom: 3rem;
  max-width: 880px;
}
.eyebrow,
.kicker {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  color: var(--green);
  font-weight: 700;
  font-size: 0.74rem;
  margin: 0 0 1.1rem;
}
.kicker {
  padding: 0.3rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(52, 224, 127, 0.05);
}
.hero h1 {
  font-size: clamp(2.3rem, 6vw, 4rem);
  letter-spacing: -0.035em;
}
.hero h1 .grad {
  background: linear-gradient(110deg, #34e07f, #7ff0b0 45%, #22b7ff);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.lede {
  color: var(--muted);
  max-width: 620px;
  margin: 1.3rem auto 0;
  font-size: 1.14rem;
}
.hero-figure {
  margin: 2.8rem auto 0;
}
.hero-stat {
  display: inline-flex;
  align-items: baseline;
  justify-content: center;
  gap: 0.15rem;
  line-height: 1;
}
.hero-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.4rem, 11vw, 6.5rem);
  letter-spacing: -0.04em;
  background: linear-gradient(180deg, #ffffff, #7ff0b0);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 60px var(--green-glow);
}
.hero-unit {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5vw, 3rem);
  font-weight: 600;
  color: var(--green);
}
.hero-caption {
  color: var(--muted);
  font-size: 1.02rem;
  margin: 0.4rem 0 0;
  font-weight: 500;
}
.hero-cta {
  display: flex;
  gap: 0.8rem;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 2.4rem;
}

/* -------------------------------- buttons ---------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  border-radius: 12px;
  font-weight: 600;
  font-size: 0.98rem;
  cursor: pointer;
  border: 1px solid transparent;
  transition: transform 0.2s var(--ease), box-shadow 0.2s, background 0.2s;
}
.btn:hover {
  transform: translateY(-2px);
}
.btn-primary {
  background: linear-gradient(180deg, var(--green), var(--green-deep));
  color: #04160c;
  box-shadow: 0 10px 30px -8px var(--green-glow);
}
.btn-primary:hover {
  box-shadow: 0 16px 40px -8px var(--green-glow);
}
.btn-ghost {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--line-strong);
  color: var(--text);
}
.btn-ghost:hover {
  background: rgba(255, 255, 255, 0.06);
}
.btn:disabled {
  opacity: 0.55;
  cursor: wait;
  transform: none;
}

/* ------------------------------- glass ------------------------------- */
.glass {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  backdrop-filter: blur(18px) saturate(1.3);
  box-shadow: var(--shadow);
}

/* ------------------------------ search ------------------------------- */
.search-section {
  padding-top: 1rem;
}
.search-card {
  padding: 2.4rem;
  text-align: center;
}
.search-head h2 {
  font-size: 1.8rem;
}
.search-head p {
  color: var(--muted);
  margin-top: 0;
}
.chain-toggle {
  display: inline-flex;
  gap: 0.35rem;
  padding: 0.35rem;
  background: rgba(0, 0, 0, 0.28);
  border: 1px solid var(--line);
  border-radius: 999px;
  margin: 1.4rem 0;
  flex-wrap: wrap;
  justify-content: center;
}
.chain-toggle button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  padding: 0.6rem 1.2rem;
  border-radius: 999px;
  cursor: pointer;
  font-weight: 600;
  font-size: 0.92rem;
  transition: all 0.2s var(--ease);
}
.chain-toggle button.active {
  background: rgba(52, 224, 127, 0.12);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--line-strong);
}
.search-row {
  display: flex;
  gap: 0.6rem;
  max-width: 680px;
  margin: 0 auto;
}
.search-row input {
  flex: 1;
  padding: 0.95rem 1.1rem;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(0, 0, 0, 0.25);
  color: var(--text);
  font-size: 0.95rem;
  font-family: ui-monospace, "SFMono-Regular", Menlo, monospace;
  transition: border 0.2s, box-shadow 0.2s;
}
.search-row input::placeholder {
  color: var(--faint);
}
.search-row input:focus {
  outline: none;
  border-color: var(--green);
  box-shadow: 0 0 0 4px var(--green-glow);
}

/* badges */
.badge {
  display: inline-grid;
  place-items: center;
  min-width: 34px;
  height: 22px;
  padding: 0 0.4rem;
  border-radius: 6px;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #04160c;
}
.badge.btc {
  background: var(--btc);
}
.badge.bsv {
  background: var(--bsv);
}
.badge.bch {
  background: var(--bch);
  color: #05122a;
}

/* tx result */
.tx-result {
  margin-top: 1.6rem;
  text-align: left;
  background: rgba(0, 0, 0, 0.25);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.4rem 1.5rem;
  animation: rise 0.4s var(--ease);
}
.tx-result.error {
  border-color: rgba(255, 107, 107, 0.5);
  color: var(--red);
  text-align: center;
}
.tx-result h3 {
  margin: 0 0 0.4rem;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1.15rem;
}
.tx-hash {
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--faint);
  word-break: break-all;
  margin: 0 0 1rem;
}
.tx-metrics {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 0.7rem;
}
.tx-metric {
  background: var(--surface-solid);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 0.9rem 1rem;
}
.tx-metric .label {
  color: var(--faint);
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.tx-metric .value {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 600;
  margin-top: 0.25rem;
  word-break: break-word;
}
.tx-metric .value small {
  font-size: 0.72rem;
  color: var(--muted);
  font-weight: 500;
}
@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
}

/* ---------------------------- section head --------------------------- */
.section-head {
  text-align: center;
  margin-bottom: 2.6rem;
}
.section-head h2 {
  font-size: clamp(1.8rem, 4vw, 2.4rem);
}
.section-head p {
  color: var(--muted);
  margin: 0.2rem auto 0;
  max-width: 620px;
}
.updated {
  display: block;
  font-size: 0.85rem;
  color: var(--faint);
  margin-top: 0.4rem;
}

/* --------------------------- compare chart --------------------------- */
.chart-card {
  padding: 2.2rem 2.4rem;
}
.chart {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.chart-row {
  display: grid;
  grid-template-columns: 92px 1fr;
  align-items: center;
  gap: 1rem;
}
.chart-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  font-family: var(--font-display);
}
.chart-track {
  position: relative;
  height: 40px;
  background: rgba(0, 0, 0, 0.28);
  border-radius: 10px;
  overflow: hidden;
}
.chart-bar {
  position: absolute;
  inset: 0 auto 0 0;
  height: 100%;
  border-radius: 10px;
  width: 0;
  transition: width 1.1s var(--ease);
  display: flex;
  align-items: center;
  justify-content: flex-end;
  padding-right: 0.8rem;
  min-width: 62px;
}
.chart-bar.btc {
  background: linear-gradient(90deg, rgba(247, 147, 26, 0.5), var(--btc));
}
.chart-bar.bsv {
  background: linear-gradient(90deg, rgba(52, 224, 127, 0.5), var(--bsv));
}
.chart-bar.bch {
  background: linear-gradient(90deg, rgba(75, 155, 255, 0.5), var(--bch));
}
.chart-bar .bar-value {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: #04160c;
  white-space: nowrap;
  text-shadow: 0 1px 2px rgba(255, 255, 255, 0.25);
}
/* label for bars too small to hold text inside — sits just past the bar end */
.bar-value.out {
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  margin-left: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  color: var(--text);
  white-space: nowrap;
  transition: left 1.1s var(--ease);
}
.chart-scale {
  margin-top: 1.6rem;
  display: flex;
  justify-content: space-between;
  color: var(--faint);
  font-size: 0.74rem;
  border-top: 1px solid var(--line);
  padding-top: 0.7rem;
  font-variant-numeric: tabular-nums;
}

/* ------------------------------ table -------------------------------- */
.table-wrap {
  overflow-x: auto;
}
.stats-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 780px;
}
.stats-table th,
.stats-table td {
  padding: 1.05rem 1.15rem;
  text-align: right;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
  font-variant-numeric: tabular-nums;
}
.stats-table th:first-child,
.stats-table td:first-child {
  text-align: left;
}
.stats-table thead th {
  color: var(--faint);
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-weight: 600;
  font-family: var(--font);
}
.stats-table tbody tr {
  transition: background 0.2s;
}
.stats-table tbody tr:hover {
  background: rgba(52, 224, 127, 0.05);
}
.stats-table tbody tr:last-child td {
  border-bottom: 0;
}
.coin {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  font-weight: 700;
}
.coin .badge {
  width: 38px;
  height: 30px;
  border-radius: 8px;
  font-size: 0.72rem;
}
.coin .coin-text small {
  display: block;
  color: var(--faint);
  font-weight: 500;
  font-size: 0.74rem;
  letter-spacing: 0;
}
.co2-cell {
  font-weight: 700;
  font-family: var(--font-display);
}
.co2-cell.clean {
  color: var(--green);
}
.co2-cell.dirty {
  color: var(--amber);
}
.stars {
  letter-spacing: 1px;
  font-size: 0.95rem;
}
.star-off {
  opacity: 0.22;
  filter: grayscale(1);
}
.meter {
  display: inline-block;
  width: 74px;
  height: 8px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.08);
  overflow: hidden;
  vertical-align: middle;
  margin-left: 0.4rem;
}
.meter > span {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--green), var(--amber));
}
.congestion-cell {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
  color: var(--muted);
  font-size: 0.9rem;
}
.loading {
  text-align: center !important;
  color: var(--muted);
  padding: 2.5rem !important;
}
.rating-note {
  color: var(--muted);
  text-align: center;
  max-width: 720px;
  margin: 1.6rem auto 0;
  font-size: 0.95rem;
}

/* ------------------------------ facts -------------------------------- */
.facts-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 1.1rem;
}
.fact-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.5rem;
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  transition: transform 0.3s var(--ease), border-color 0.3s;
  backdrop-filter: blur(12px);
}
.fact-card:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}
.fact-card .icon {
  font-size: 1.7rem;
  line-height: 1;
  filter: drop-shadow(0 0 12px rgba(52, 224, 127, 0.3));
}
.fact-card p {
  margin: 0;
  font-size: 0.98rem;
}

/* ----------------------------- formula ------------------------------- */
.formula-section {
  max-width: 940px;
}
.formula-steps {
  display: flex;
  align-items: stretch;
  gap: 0.6rem;
  flex-wrap: wrap;
  justify-content: center;
  margin-bottom: 1.6rem;
}
.f-step {
  flex: 1 1 150px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1rem 1.1rem;
  text-align: center;
  position: relative;
  backdrop-filter: blur(10px);
}
.f-step .n {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  margin: 0 auto 0.5rem;
  background: rgba(52, 224, 127, 0.14);
  color: var(--green);
  font-weight: 700;
  font-size: 0.82rem;
  font-family: var(--font-display);
}
.f-step .t {
  font-size: 0.86rem;
  color: var(--muted);
}
.formula-card {
  border-left: 3px solid var(--green);
  padding: 1.8rem 2rem;
}
.formula-text {
  color: var(--muted);
  font-size: 1.02rem;
  margin: 0;
}
.method-note {
  color: var(--faint);
  font-size: 0.9rem;
  max-width: 760px;
  margin: 1.3rem auto 0;
  text-align: center;
  line-height: 1.6;
}
.method-note strong {
  color: var(--muted);
}

/* ---------------------------- standards ------------------------------ */
.co2-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1.3rem;
}
.co2-card {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.8rem;
  text-align: center;
  backdrop-filter: blur(14px);
  position: relative;
  overflow: hidden;
  transition: transform 0.3s var(--ease);
}
.co2-card:hover {
  transform: translateY(-4px);
}
.co2-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
}
.co2-card.c-btc::before {
  background: var(--btc);
}
.co2-card.c-bsv::before {
  background: var(--bsv);
}
.co2-card.c-bch::before {
  background: var(--bch);
}
.co2-card .coin-name {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: var(--muted);
  letter-spacing: 0.03em;
  font-size: 0.9rem;
}
.co2-card .big {
  font-family: var(--font-display);
  font-size: 2.8rem;
  font-weight: 700;
  margin: 0.5rem 0 0.1rem;
  letter-spacing: -0.03em;
}
.co2-card .unit {
  color: var(--faint);
  font-size: 0.82rem;
}
.co2-card.rank-clean .big {
  color: var(--green);
}
.co2-card.rank-dirty .big {
  color: var(--amber);
}
.co2-card .stars {
  margin-top: 0.7rem;
  font-size: 1.15rem;
}
.co2-card .bench {
  margin-top: 0.9rem;
  font-size: 0.76rem;
  color: var(--faint);
}

/* ------------------------------- faq --------------------------------- */
.faq-list {
  max-width: 780px;
  margin: 0 auto;
}
.faq-list details {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  padding: 1.1rem 1.4rem;
  margin-bottom: 0.8rem;
  backdrop-filter: blur(10px);
  transition: border-color 0.2s;
}
.faq-list details[open] {
  border-color: var(--line-strong);
}
.faq-list summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.faq-list summary::-webkit-details-marker {
  display: none;
}
.faq-list summary::after {
  content: "+";
  color: var(--green);
  font-size: 1.4rem;
  font-weight: 400;
  transition: transform 0.25s;
}
.faq-list details[open] summary::after {
  transform: rotate(45deg);
}
.faq-list details p {
  color: var(--muted);
  margin: 0.8rem 0 0;
}

/* ------------------------------ footer ------------------------------- */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
  background: rgba(6, 16, 10, 0.7);
  backdrop-filter: blur(14px);
  padding: 3.5rem 1.75rem 1.75rem;
  margin-top: 3rem;
}
.footer-grid {
  max-width: 1180px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2.5rem;
}
.footer-grid h4 {
  color: var(--text);
  font-size: 1rem;
}
.footer-grid a {
  display: block;
  color: var(--muted);
  margin-bottom: 0.4rem;
  transition: color 0.2s;
}
.footer-grid a:hover {
  color: var(--green);
}
.footer-tag {
  color: var(--muted);
  max-width: 320px;
}
.footer-bottom {
  max-width: 1180px;
  margin: 2.5rem auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
  color: var(--faint);
  font-size: 0.85rem;
  text-align: center;
}

/* --------------------------- scroll reveal --------------------------- */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.in {
  opacity: 1;
  transform: none;
}
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --------------------------- responsive ------------------------------ */
@media (max-width: 760px) {
  .nav {
    display: none;
  }
  section {
    padding: 4rem 1.2rem;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 1.8rem;
  }
  .search-row {
    flex-direction: column;
  }
  .chart-row {
    grid-template-columns: 70px 1fr;
  }
  .chart-card {
    padding: 1.6rem 1.3rem;
  }
}