@font-face {
  font-family: "Horizon Design System";
  src:
    local("Horizon Design System"),
    local("HorizonDesignSystem"),
    url("../../fonts/HorizonDesignSystem.woff2") format("woff2");
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --black: #050505;
  --black-card: rgba(18, 18, 18, 0.90);
  --gold: #d4af37;
  --gold-soft: #f0d77a;
  --gold-deep: #8f6a16;
  --white: #ffffff;
  --white-soft: #ede8d9;
  --line: rgba(212, 175, 55, 0.28);
  --success: #54ef78;
  --success-deep: #0d8a2d;
  --warning: #ffd66b;
  --danger: #ff7b7b;
  --bus-red: #d2232a;
  --radius: 22px;
  --shadow: 0 24px 90px rgba(0, 0, 0, 0.45);
  --max-width: 1200px;
  --font-ui: "Horizon Design System", Arial, Helvetica, sans-serif;
}

* {
  box-sizing: border-box;
  font-family: var(--font-ui);
}

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-ui);
  color: var(--white);
  background: #000 url("../../space_background.png") center/cover fixed no-repeat;
  overflow-x: hidden;
}

button,
input,
select,
textarea,
pre,
code {
  font-family: var(--font-ui);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(0,0,0,0.82), rgba(0,0,0,0.90)),
    radial-gradient(circle at top right, rgba(212,175,55,0.15), transparent 25%),
    radial-gradient(circle at bottom left, rgba(212,175,55,0.12), transparent 20%);
  pointer-events: none;
  z-index: -1;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  backdrop-filter: blur(14px);
  background: linear-gradient(to bottom, rgba(0,0,0,0.92), rgba(0,0,0,0.72));
  border-bottom: 1px solid var(--line);
}

.nav {
  width: min(var(--max-width), calc(100% - 32px));
  min-height: 74px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 900;
  letter-spacing: 0.03em;
}

.brand-mark {
  width: 44px;
  height: 44px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  background: linear-gradient(145deg, rgba(212,175,55,0.16), rgba(255,255,255,0.05));
  box-shadow: 0 0 30px rgba(212,175,55,0.18);
  color: var(--gold);
}

.brand small {
  display: block;
  color: var(--white-soft);
  opacity: 0.8;
  font-size: 0.76rem;
  font-weight: 700;
  margin-top: 2px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.nav-link {
  padding: 10px 15px;
  border-radius: 999px;
  border: 1px solid transparent;
  color: var(--white-soft);
  font-weight: 700;
  transition: 160ms ease;
  cursor: pointer;
}

.nav-link:hover,
.nav-link.active {
  color: var(--white);
  border-color: rgba(212,175,55,0.45);
  background: rgba(212,175,55,0.10);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.04);
}

.page-shell {
  width: min(var(--max-width), calc(100% - 32px));
  margin: 0 auto;
  min-height: calc(100vh - 75px);
  padding: 54px 0 90px;
  position: relative;
}

.page {
  position: relative;
}

.page::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 34px;
  pointer-events: none;
  z-index: 0;
  opacity: 0.55;
}

#home::before {
  background:
    radial-gradient(circle at 20% 20%, rgba(212,175,55,0.10), transparent 25%),
    linear-gradient(135deg, rgba(255,255,255,0.02), rgba(212,175,55,0.03));
}

#dashboard::before {
  background:
    radial-gradient(circle at 80% 0%, rgba(212,175,55,0.10), transparent 30%),
    linear-gradient(135deg, rgba(212,175,55,0.03), rgba(255,255,255,0.02));
}

#communication::before {
  background:
    radial-gradient(circle at 50% 4%, rgba(212,175,55,0.13), transparent 32%),
    linear-gradient(135deg, rgba(212,175,55,0.04), rgba(255,255,255,0.015));
}

#partners::before {
  background:
    radial-gradient(circle at 50% 0%, rgba(212,175,55,0.12), transparent 35%),
    linear-gradient(180deg, rgba(255,255,255,0.015), rgba(212,175,55,0.03));
}

.page > * {
  position: relative;
  z-index: 1;
}

.hero {
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  gap: 34px;
  align-items: center;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(212,175,55,0.10);
  color: var(--gold-soft);
  padding: 8px 14px;
  font-weight: 800;
  font-size: 0.78rem;
  letter-spacing: 0.11em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

h1, h2, h3, p { margin-top: 0; }

h1 {
  font-size: clamp(2.7rem, 6vw, 5.1rem);
  line-height: 0.96;
  letter-spacing: -0.07em;
  margin-bottom: 22px;
}

.gradient-text {
  background: linear-gradient(100deg, #ffffff 0%, #f2e6b0 52%, #d4af37 100%);
  background-clip: text;
  -webkit-background-clip: text;
  color: transparent;
}

.lead {
  color: var(--white-soft);
  line-height: 1.75;
  font-size: clamp(1rem, 2vw, 1.18rem);
  max-width: 64ch;
  margin-bottom: 28px;
}

.hero-actions {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 0 18px;
  border-radius: 999px;
  border: 1px solid rgba(212,175,55,0.42);
  background: linear-gradient(135deg, rgba(212,175,55,0.18), rgba(255,255,255,0.08));
  color: var(--white);
  font-weight: 800;
  cursor: pointer;
  transition: 160ms ease;
}

.button:hover {
  transform: translateY(-1px);
  box-shadow: 0 10px 30px rgba(212,175,55,0.16);
}

.button.secondary {
  background: rgba(255,255,255,0.04);
  border-color: var(--line);
  color: var(--white-soft);
}

.stats-strip {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  max-width: 760px;
}

.mini-stat {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.48);
  backdrop-filter: blur(10px);
}

.mini-stat strong {
  display: block;
  font-size: 1.36rem;
  color: var(--gold-soft);
  margin-bottom: 4px;
}

.mini-stat span {
  color: var(--white-soft);
  font-size: 0.88rem;
  line-height: 1.45;
}

.visual-card {
  min-height: 560px;
  position: relative;
  overflow: hidden;
  border-radius: 30px;
  border: 1px solid var(--line);
  background:
    linear-gradient(180deg, rgba(8,8,8,0.76), rgba(8,8,8,0.88)),
    url("../../space_background.png") center/cover no-repeat;
  box-shadow: var(--shadow);
  display: grid;
  place-items: center;
}

.visual-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% 45%, rgba(212,175,55,0.12), transparent 28%),
    linear-gradient(180deg, rgba(255,255,255,0.03), transparent 20%);
  pointer-events: none;
}

.satellite-wrap {
  position: relative;
  width: min(100%, 540px);
  display: grid;
  place-items: center;
  padding: 30px;
  z-index: 1;
}

.satellite-spin {
  width: 100%;
  max-width: 520px;
  height: auto;
  filter: drop-shadow(0 0 22px rgba(212,175,55,0.25));
  animation: satelliteSpin 16s linear infinite;
  transform-origin: center center;
  user-select: none;
  pointer-events: none;
}

@keyframes satelliteSpin {
  from { transform: rotateY(0deg) rotate(0deg); }
  to { transform: rotateY(360deg) rotate(360deg); }
}

.visual-label {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 24px;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px;
  color: var(--white-soft);
  font-size: 0.88rem;
  z-index: 1;
}

.visual-label strong {
  display: block;
  color: var(--white);
  font-size: 1rem;
  margin-bottom: 4px;
}

.section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 26px;
}

.section-header h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: -0.05em;
  margin-bottom: 8px;
}

.section-header p {
  margin: 0;
  color: var(--white-soft);
  line-height: 1.65;
  max-width: 76ch;
}

.dashboard-grid {
  display: grid;
  grid-template-columns: 0.95fr 1.55fr;
  gap: 18px;
}

.telemetry-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.span-full {
  margin-bottom: 18px;
}

.summary-grid {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.summary-meta {
  margin-top: 16px;
}

.stream-box {
  margin-top: 0;
}

.stream-panel-card {
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: var(--stream-panel-height, 630px);
  max-height: var(--stream-panel-height, 630px);
}

.stream-panel-card .card-body {
  flex: 1;
  display: flex;
  min-height: 0;
  overflow: hidden;
}

.stream-panel-card .stream-box {
  flex: 1;
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

.card {
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--black-card);
  box-shadow: 0 18px 60px rgba(0,0,0,0.30);
  overflow: hidden;
  backdrop-filter: blur(12px);
}

.card-header {
  padding: 20px 20px 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.card-title {
  margin: 0;
  font-size: 1.03rem;
  color: var(--white);
  letter-spacing: -0.02em;
}

.status-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 7px 10px;
  font-weight: 800;
  font-size: 0.76rem;
  border: 1px solid rgba(212,175,55,0.35);
  background: rgba(212,175,55,0.10);
  color: var(--gold-soft);
  white-space: nowrap;
}

.status-pill.offline {
  color: var(--warning);
  border-color: rgba(255,214,107,0.26);
  background: rgba(255,214,107,0.08);
}

.status-pill.online {
  color: var(--success);
  border-color: rgba(84,239,120,0.32);
  background: rgba(84,239,120,0.08);
}

.card-body { padding: 20px; }

.pack-summary {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.metric-tile {
  padding: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
}

.metric-tile span {
  display: block;
  color: var(--white-soft);
  font-size: 0.82rem;
  margin-bottom: 8px;
}

.metric-tile strong {
  color: var(--gold-soft);
  font-size: 1.48rem;
  letter-spacing: -0.03em;
}

.metric-detail {
  display: block;
  margin-top: 8px;
  color: var(--white-soft);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
}

.cells {
  display: grid;
  gap: 12px;
  margin-top: 16px;
}

.cell-row {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
}

.cell-top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
  font-weight: 800;
}

.cell-top span {
  color: var(--white-soft);
  font-size: 0.85rem;
}

.bar {
  height: 10px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.06);
  margin-bottom: 12px;
}

.bar-fill {
  height: 100%;
  width: 50%;
  border-radius: inherit;
  background: linear-gradient(90deg, #8f6a16, #d4af37, #fff2b8);
}

.cell-meta,
.panel-meta {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  color: var(--white-soft);
  font-size: 0.86rem;
}

.cell-meta strong,
.panel-meta strong {
  color: var(--white);
}

.panel-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.panel-card {
  min-height: 152px;
  padding: 16px;
  position: relative;
  border-radius: 18px;
  border: 1px solid var(--line);
  background:
    linear-gradient(135deg, rgba(212,175,55,0.08), rgba(255,255,255,0.03)),
    rgba(255,255,255,0.03);
  overflow: hidden;
}

.panel-card::before {
  content: "";
  position: absolute;
  inset: auto -16px -36px auto;
  width: 110px;
  height: 110px;
  border-radius: 50%;
  background: rgba(212,175,55,0.07);
  filter: blur(4px);
}

.panel-card h3 {
  margin-bottom: 12px;
  font-size: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 10px;
}

.string-label {
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(212,175,55,0.08);
  color: var(--gold-soft);
  font-size: 0.78rem;
  padding: 5px 8px;
}

.large-value {
  font-size: 1.52rem;
  font-weight: 850;
  letter-spacing: -0.04em;
  color: var(--gold-soft);
  margin-bottom: 4px;
}

.large-value small {
  color: var(--white-soft);
  font-size: 0.86rem;
  font-weight: 700;
}

.string-summary {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-top: 16px;
}

.string-card {
  padding: 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
}

.string-card h3 {
  margin-bottom: 10px;
  font-size: 0.95rem;
  color: var(--white-soft);
}

.telemetry-box {
  margin-top: 18px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(0,0,0,0.30);
  overflow: hidden;
}

.telemetry-toolbar {
  padding: 14px;
  display: flex;
  gap: 10px;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  border-bottom: 1px solid var(--line);
}

.input,
.select {
  flex: 1 1 180px;
  min-height: 42px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.04);
  color: var(--white);
  padding: 0 14px;
  outline: none;
}

.select option {
  color: #111;
  background: #fff;
}

.input:focus,
.select:focus {
  border-color: rgba(212,175,55,0.55);
  box-shadow: 0 0 0 3px rgba(212,175,55,0.08);
}

.telemetry-log {
  margin: 0;
  padding: 16px;
  min-height: 118px;
  overflow-y: auto;
  overflow-x: hidden;
  overflow-wrap: anywhere;
  box-sizing: border-box;
  scrollbar-gutter: stable;
  color: #f1ebdb;
  font-size: 0.86rem;
  line-height: 1.55;
  white-space: pre-wrap;
}

.stream-panel-card .telemetry-log {
  flex: 1 1 auto;
  min-height: 0;
  max-height: 100%;
}

.command-result-log {
  height: 150px;
  min-height: 150px;
  max-height: 150px;
  overscroll-behavior: contain;
}

.communication-controls {
  margin-bottom: 18px;
}

.communication-controls .card-body {
  display: grid;
  grid-template-columns: 1.1fr 1.9fr;
  gap: 18px;
  align-items: center;
}

.demo-control {
  display: flex;
  align-items: center;
  gap: 14px;
  min-height: 74px;
  padding: 14px 16px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
}

.demo-control-copy strong {
  display: block;
  margin-bottom: 4px;
}

.demo-control-copy span {
  color: var(--white-soft);
  font-size: 0.86rem;
  line-height: 1.45;
}

.switch {
  position: relative;
  width: 64px;
  height: 34px;
  flex: 0 0 auto;
}

.switch input {
  width: 1px;
  height: 1px;
  opacity: 0;
  position: absolute;
}

.switch-track {
  position: absolute;
  inset: 0;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.08);
  cursor: pointer;
  transition: 180ms ease;
}

.switch-track::after {
  content: "";
  position: absolute;
  top: 4px;
  left: 4px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--white-soft);
  box-shadow: 0 4px 12px rgba(0,0,0,0.35);
  transition: 180ms ease;
}

.switch input:checked + .switch-track {
  background: rgba(84,239,120,0.18);
  border-color: rgba(84,239,120,0.48);
  box-shadow: 0 0 20px rgba(84,239,120,0.12);
}

.switch input:checked + .switch-track::after {
  transform: translateX(30px);
  background: var(--success);
  box-shadow: 0 0 15px rgba(84,239,120,0.65);
}

.transaction-form {
  display: grid;
  grid-template-columns: 1.25fr 0.85fr 0.9fr auto;
  gap: 10px;
  align-items: center;
}

/* I²C visual diagram */
.i2c-board {
  position: relative;
  min-height: 780px;
  border-radius: 28px;
  border: 1px solid var(--line);
  overflow: hidden;
  background:
    linear-gradient(rgba(255,255,255,0.015) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.015) 1px, transparent 1px),
    radial-gradient(circle at center, rgba(212,175,55,0.07), transparent 38%),
    rgba(3,3,3,0.84);
  background-size: 34px 34px, 34px 34px, auto, auto;
  box-shadow: var(--shadow);
}

.i2c-board::after {
  content: "I\0000B2C BUS SANDBOX";
  position: absolute;
  left: 20px;
  bottom: 15px;
  font-size: 0.73rem;
  letter-spacing: 0.18em;
  color: rgba(240,215,122,0.56);
}

.bus-trace {
  position: absolute;
  left: 18%;
  right: 4%;
  height: 4px;
  border-radius: 999px;
  background: linear-gradient(90deg, #8d171d, var(--bus-red), #ff6267);
  box-shadow: 0 0 8px rgba(210,35,42,0.44);
  transition: 160ms ease;
  z-index: 1;
}

.bus-trace.sda { top: 44%; }
.bus-trace.scl { top: 51%; }

.bus-trace.active {
  box-shadow: 0 0 18px rgba(84,239,120,0.72);
  outline: 1px solid rgba(84,239,120,0.18);
}

.bus-label {
  position: absolute;
  right: 3%;
  color: #ff8080;
  font-size: 0.79rem;
  font-weight: 850;
  letter-spacing: 0.05em;
  z-index: 3;
  transform: translateY(-28px);
}

.bus-label.sda { top: 44%; }
.bus-label.scl { top: 51%; }

.vertical-trace {
  position: absolute;
  width: 3px;
  border-radius: 999px;
  background: linear-gradient(#8d171d, #ff6b6f);
  box-shadow: 0 0 8px rgba(210,35,42,0.46);
  z-index: 1;
  transition: 160ms ease;
}

.vertical-trace.active {
  box-shadow: 0 0 18px rgba(84,239,120,0.72);
  outline: 1px solid rgba(84,239,120,0.12);
}

.trace-bq76942 {
  left: 43.6%;
  top: 13.8%;
  height: 30.4%;
}

.trace-additional {
  left: 81.2%;
  top: 13.8%;
  height: 30.4%;
}

.trace-ina226-sda {
  left: 31.8%;
  top: 44%;
  height: 21.8%;
}

.trace-ina226-scl {
  left: 26%;
  top: 51%;
  height: 14.8%;
}

.trace-bq25798-sda {
  left: 61.5%;
  top: 44%;
  height: 21.8%;
}

.trace-bq25798-scl {
  left: 57%;
  top: 51%;
  height: 14.8%;
}

.device-card {
  position: absolute;
  width: 242px;
  min-height: 202px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(212,175,55,0.34);
  background:
    linear-gradient(145deg, rgba(212,175,55,0.07), rgba(255,255,255,0.025)),
    rgba(12,12,12,0.96);
  box-shadow: 0 18px 54px rgba(0,0,0,0.42);
  z-index: 2;
  transition: 180ms ease;
}

.device-card.transaction-active {
  border-color: rgba(84,239,120,0.72);
  box-shadow:
    0 0 0 1px rgba(84,239,120,0.17),
    0 0 34px rgba(84,239,120,0.19),
    0 18px 54px rgba(0,0,0,0.42);
  transform: translateY(-2px);
}

.device-card.leader {
  left: 2.5%;
  top: 33.5%;
  width: 214px;
}

.device-card.bq76942 {
  left: 34%;
  top: 4%;
}

.device-card.additional {
  right: 4%;
  top: 4%;
}

.device-card.ina226 {
  left: 22%;
  bottom: 4%;
}

.device-card.bq25798 {
  left: 50.5%;
  bottom: 4%;
}

.device-heading {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 10px;
  margin-bottom: 12px;
}

.device-heading h3 {
  margin: 0;
  font-size: 1rem;
  line-height: 1.25;
}

.device-heading small {
  display: block;
  color: var(--white-soft);
  margin-top: 4px;
  font-size: 0.73rem;
  line-height: 1.35;
}

.device-address {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 28px;
  padding: 0 9px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(212,175,55,0.08);
  color: var(--gold-soft);
  font-size: 0.73rem;
  font-weight: 850;
  white-space: nowrap;
}

.device-metrics {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.device-metric {
  padding: 9px;
  border-radius: 12px;
  background: rgba(255,255,255,0.035);
  border: 1px solid rgba(255,255,255,0.055);
}

.device-metric span {
  display: block;
  color: var(--white-soft);
  font-size: 0.67rem;
  margin-bottom: 4px;
  line-height: 1.25;
}

.device-metric strong {
  display: block;
  color: var(--white);
  font-size: 0.88rem;
  overflow-wrap: anywhere;
}

.device-extra-labels {
  display: flex;
  gap: 12px;
  color: #ff9a9a;
  font-size: 0.8rem;
  font-weight: 800;
  margin-top: 12px;
}

.communication-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 12px;
  padding-top: 11px;
  border-top: 1px solid rgba(212,175,55,0.17);
}

.led-pair {
  display: flex;
  align-items: center;
  gap: 9px;
}

.led-group {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  color: var(--white-soft);
  font-size: 0.67rem;
  font-weight: 800;
}

.comm-led {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #162018;
  border: 1px solid rgba(255,255,255,0.14);
  box-shadow: inset 0 0 5px rgba(0,0,0,0.9);
  transition: 100ms ease;
}

.comm-led.on {
  background: var(--success);
  border-color: #caffd5;
  box-shadow:
    0 0 7px rgba(84,239,120,0.95),
    0 0 18px rgba(84,239,120,0.68);
}

.device-ack {
  color: var(--white-soft);
  font-size: 0.68rem;
  font-weight: 800;
  text-align: right;
}

.device-ack.good { color: var(--success); }
.device-ack.idle { color: var(--warning); }

.leader-status {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--success);
  font-size: 0.75rem;
  font-weight: 850;
  margin-top: 12px;
}

.leader-status::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 12px rgba(84,239,120,0.7);
}

.i2c-log-grid {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 18px;
  margin-top: 18px;
}

.bus-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 10px;
}

.bus-stat {
  padding: 14px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
}

.bus-stat span {
  display: block;
  color: var(--white-soft);
  font-size: 0.75rem;
  margin-bottom: 7px;
}

.bus-stat strong {
  color: var(--gold-soft);
  font-size: 1.2rem;
}

/* I²C topology dashboard */
.i2c-page {
  --sda: #ef444f;
  --scl: #54d98c;
  --instrument: #0b0e0f;
  --instrument-raised: #121617;
  --instrument-line: rgba(242, 240, 232, 0.14);
  max-width: 1220px;
  margin: 0 auto;
}

.i2c-page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 12px;
}

.i2c-page-header h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 0.96;
  letter-spacing: -0.04em;
}

.i2c-page-header p {
  max-width: 68ch;
  margin: 0;
  color: var(--white-soft);
  line-height: 1.55;
}

.i2c-mode-key {
  display: flex;
  gap: 16px;
  padding-bottom: 4px;
  color: var(--white-soft);
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  white-space: nowrap;
}

.i2c-mode-key span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend-line {
  display: inline-block;
  width: 28px;
  height: 3px;
  border-radius: 2px;
}

.legend-line.sda { background: var(--sda); }
.legend-line.scl { background: var(--scl); }

.i2c-data-note {
  margin: 0 0 16px;
  color: #b7bdb9;
  font-size: 0.8rem;
}

.i2c-workspace {
  position: relative;
  min-height: 660px;
  overflow: hidden;
  border: 1px solid rgba(212, 175, 55, 0.3);
  border-radius: 16px;
  background:
    linear-gradient(rgba(242, 240, 232, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(242, 240, 232, 0.025) 1px, transparent 1px),
    rgba(3, 5, 6, 0.94);
  background-size: 32px 32px;
  box-shadow: 0 22px 70px rgba(0, 0, 0, 0.38);
  isolation: isolate;
}

.telemetry-page-bank {
  position: absolute;
  top: 20px;
  left: 50%;
  width: min(10in, calc(100% - 56px));
  min-height: 166px;
  padding: 34px 18px 16px;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 14px;
  transform: translateX(-50%);
  border: 1px solid rgba(212, 175, 55, 0.24);
  border-radius: 14px;
  background: rgba(9, 12, 13, 0.97);
}

.page-bank-label {
  position: absolute;
  top: 9px;
  left: 18px;
  right: 18px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--gold-soft);
  font-size: 0.69rem;
  font-weight: 850;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.page-bank-label small {
  color: #8f9993;
  font: inherit;
  font-weight: 700;
}

.topology-tile {
  position: relative;
  min-width: 0;
  min-height: 124px;
  padding: 14px;
  overflow: hidden;
  border: 1px solid var(--instrument-line);
  border-radius: 12px;
  background: var(--instrument-raised);
  color: var(--white);
  text-align: left;
  cursor: pointer;
  box-shadow: 0 10px 26px rgba(0, 0, 0, 0.24);
  transition: border-color 160ms ease, background-color 160ms ease, transform 160ms ease;
}

.topology-tile:hover {
  border-color: rgba(242, 200, 80, 0.62);
  background: #171c1d;
  transform: translateY(-2px);
}

.topology-tile:focus-visible,
.detail-close:focus-visible {
  outline: 3px solid rgba(242, 200, 80, 0.92);
  outline-offset: 3px;
}

.topology-tile strong {
  display: block;
  margin-top: 0;
  font-size: 1.08rem;
  line-height: 1.16;
  letter-spacing: -0.02em;
}

.tile-meta {
  display: block;
  margin-top: 5px;
  color: #a7b0ab;
  font-size: 0.69rem;
  font-weight: 700;
  line-height: 1.25;
}

.tile-value {
  display: block;
  margin-top: 9px;
  overflow: hidden;
  color: #e7e9e5;
  font-variant-numeric: tabular-nums;
  font-size: 0.75rem;
  line-height: 1.35;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.tile-action {
  position: absolute;
  right: 12px;
  bottom: 10px;
  color: #98a29c;
  font-size: 0.65rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.tile-action svg {
  width: 13px;
  height: 13px;
  margin-left: 4px;
  fill: none;
  stroke: var(--gold-soft);
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.5;
  vertical-align: -2px;
}

.page-port i,
.device-port i {
  position: absolute;
  top: 0;
  width: 3px;
  border-radius: 2px;
}

.i2c-rails {
  position: absolute;
  top: 268px;
  left: 50%;
  width: min(10in, calc(100% - 56px));
  height: 0.5in;
  transform: translateX(-50%);
}

.rail {
  position: absolute;
  left: 0;
  right: 0;
  height: 4px;
  border-radius: 2px;
}

.rail::before {
  content: "";
  position: absolute;
  inset: -6px 0;
  opacity: 0.3;
  filter: blur(8px);
  background: inherit;
}

.rail span {
  position: absolute;
  right: 10px;
  bottom: 10px;
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.08em;
}

.rail-sda {
  top: 0;
  background: var(--sda);
  color: #ff9da3;
}

.rail-scl {
  bottom: 0;
  background: var(--scl);
  color: #94efb9;
}

.bus-connection-status {
  position: absolute;
  left: 0;
  top: -68px;
  min-width: 174px;
  min-height: 56px;
  padding: 9px 12px;
  display: flex;
  align-items: center;
  gap: 10px;
  transform: none;
  border: 1px solid rgba(242, 240, 232, 0.2);
  border-radius: 12px;
  background: #101415;
  box-shadow: 0 9px 26px rgba(0, 0, 0, 0.34);
  z-index: 2;
}

.bus-status-lights {
  display: grid;
  gap: 5px;
}

.bus-status-lights i {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: #e3bc57;
  box-shadow: 0 0 9px rgba(227, 188, 87, 0.46);
}

.bus-connection-status small,
.bus-connection-status strong {
  display: block;
}

.bus-connection-status small {
  margin-bottom: 3px;
  color: #8f9993;
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.bus-connection-status strong {
  color: var(--warning);
  font-size: 0.76rem;
}

.bus-connection-status strong.online { color: var(--success); }

.i2c-workspace[data-stream-state="online"] .rail {
  animation: busSignal 1.3s ease-in-out infinite alternate;
}

.i2c-workspace[data-stream-state="online"] .bus-status-lights i {
  background: var(--success);
  box-shadow: 0 0 12px rgba(84, 239, 120, 0.72);
}

@keyframes busSignal {
  from { filter: brightness(0.9); }
  to { filter: brightness(1.35); }
}

.device-bank {
  position: absolute;
  top: 396px;
  left: 50%;
  width: min(10in, calc(100% - 56px));
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
  transform: translateX(-50%);
}

.device-tile {
  min-height: 158px;
  overflow: visible;
}

.bus-leader-tile {
  overflow: visible;
}

.non-i2c-tile .tile-meta {
  color: #b8c0bb;
}

.page-port {
  position: absolute;
  top: 100%;
  left: 50%;
  width: 34px;
  height: 138px;
  transform: translateX(-50%);
  pointer-events: none;
}

.page-port i:first-child {
  left: 6px;
  height: 90px;
  background: var(--sda);
}

.page-port i:last-child {
  right: 6px;
  height: 138px;
  background: var(--scl);
}

.device-ack {
  position: absolute;
  left: 14px;
  bottom: 11px;
  color: var(--success);
  font-size: 0.62rem;
  font-weight: 850;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.device-ack.idle { color: var(--warning); }

.device-port {
  position: absolute;
  top: -128px;
  left: 50%;
  width: 34px;
  height: 128px;
  transform: translateX(-50%);
  pointer-events: none;
}

.device-port i:first-child {
  left: 6px;
  height: 128px;
  background: var(--sda);
}

.device-port i:last-child {
  right: 6px;
  top: 48px;
  height: 80px;
  background: var(--scl);
}

.i2c-detail-layer {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: none;
  place-items: center;
  padding: 22px;
  background: rgba(0, 0, 0, 0.78);
}

.i2c-detail-layer.is-open { display: grid; }

.i2c-detail-window {
  width: min(5in, calc(100% - 12px));
  height: min(3in, calc(100% - 12px));
  min-height: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid rgba(242, 200, 80, 0.52);
  border-radius: 14px;
  background: #0a0d0e;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.7);
  outline: none;
  animation: detailReveal 180ms cubic-bezier(0.16, 1, 0.3, 1) both;
}

@keyframes detailReveal {
  from { opacity: 0.4; transform: translateY(10px) scale(0.985); }
  to { opacity: 1; transform: translateY(0) scale(1); }
}

.detail-window-header {
  min-height: 58px;
  padding: 10px 12px 10px 16px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  border-bottom: 1px solid rgba(242, 240, 232, 0.12);
  background: #111516;
}

.detail-window-header span {
  display: block;
  margin-bottom: 3px;
  color: var(--gold-soft);
  font-size: 0.62rem;
  font-weight: 850;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.detail-window-header h2 {
  margin: 0;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.detail-close {
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  display: grid;
  place-items: center;
  border: 1px solid rgba(242, 240, 232, 0.16);
  border-radius: 9px;
  background: transparent;
  color: var(--white-soft);
  cursor: pointer;
}

.detail-close:hover {
  border-color: rgba(239, 68, 79, 0.58);
  color: #ff9da3;
}

.detail-close svg {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-width: 1.8;
}

.detail-window-body {
  flex: 1;
  min-height: 0;
  padding: 16px;
  overflow: auto;
  scrollbar-color: var(--gold-deep) #111516;
  scrollbar-width: thin;
}

.detail-window-body::-webkit-scrollbar { width: 9px; }
.detail-window-body::-webkit-scrollbar-track { background: #111516; }
.detail-window-body::-webkit-scrollbar-thumb { background: var(--gold-deep); border-radius: 8px; }

.detail-window-body .metric-tile {
  min-width: 0;
  padding: 12px;
  border-radius: 10px;
}

.detail-window-body .metric-tile span { margin-bottom: 5px; font-size: 0.72rem; }
.detail-window-body .metric-tile strong { font-size: 1.08rem; }
.detail-window-body .pack-summary { gap: 9px; }
.detail-window-body .summary-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.detail-window-body .cells { margin-top: 12px; gap: 9px; }
.detail-window-body .cell-row { padding: 12px; border-radius: 10px; }
.detail-window-body .bar { height: 7px; }
.detail-window-body .telemetry-box { margin-top: 12px; border-radius: 10px; }
.detail-window-body .telemetry-toolbar { padding: 10px; }
.detail-window-body .telemetry-log { min-height: 112px; font-size: 0.76rem; }

.detail-explainer {
  margin: 12px 0 0;
  color: #aeb6b1;
  font-size: 0.76rem;
  line-height: 1.55;
}

.console-stack {
  overflow: hidden;
  border: 1px solid rgba(242, 240, 232, 0.12);
  border-radius: 10px;
}

.console-stack .input {
  min-height: 38px;
  border-radius: 9px;
  font-size: 0.75rem;
}

.console-stack .button {
  min-height: 38px;
  border-radius: 9px;
  font-size: 0.72rem;
}

.i2c-footnote {
  max-width: 90ch;
  margin: 12px auto 0;
  color: #8f9993;
  font-size: 0.72rem;
  line-height: 1.5;
  text-align: center;
}

.i2c-page ::selection {
  background: rgba(242, 200, 80, 0.82);
  color: #050505;
}

@media (prefers-reduced-motion: reduce) {
  .i2c-workspace[data-stream-state="online"] .rail,
  .i2c-detail-window {
    animation: none;
  }
}

@media (max-width: 760px) {
  .i2c-page-header {
    align-items: flex-start;
    flex-direction: column;
  }

  .i2c-mode-key {
    padding-bottom: 0;
  }

  .i2c-workspace {
    min-height: 0;
    padding: 16px;
    overflow: visible;
  }

  .telemetry-page-bank,
  .i2c-rails,
  .device-bank {
    position: relative;
    inset: auto;
    width: 100%;
    transform: none;
  }

  .telemetry-page-bank {
    min-height: 0;
    padding: 38px 12px 12px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .i2c-rails {
    height: 70px;
    margin: 18px 0;
  }

  .rail-sda { top: 0; }
  .rail-scl { bottom: 0; }

  .bus-connection-status {
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
  }

  .bus-leader-tile,
  .device-tile {
    padding-right: 76px;
  }

  .page-port,
  .device-port {
    position: absolute;
    top: 14px;
    right: 12px;
    left: auto;
    width: 48px;
    height: 26px;
    display: block;
    transform: none;
  }

  .page-port i:first-child,
  .device-port i:first-child,
  .page-port i:last-child,
  .device-port i:last-child {
    left: 0;
    right: auto;
    width: 22px;
    height: 3px;
  }

  .page-port i:first-child,
  .device-port i:first-child { top: 2px; }

  .page-port i:last-child,
  .device-port i:last-child { top: 17px; }

  .page-port i::after,
  .device-port i::after {
    position: absolute;
    left: 27px;
    top: -5px;
    font-size: 0.56rem;
    font-style: normal;
    font-weight: 900;
    letter-spacing: 0.05em;
  }

  .page-port i:first-child::after,
  .device-port i:first-child::after {
    content: "SDA";
    color: #ff9da3;
  }

  .page-port i:last-child::after,
  .device-port i:last-child::after {
    content: "SCL";
    color: #94efb9;
  }

  .device-bank {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .i2c-detail-layer {
    position: fixed;
    z-index: 80;
  }

  .i2c-detail-window {
    width: min(5in, calc(100vw - 28px));
    height: min(5.5in, calc(100vh - 44px));
  }
}

@media (max-width: 480px) {
  .telemetry-page-bank,
  .device-bank {
    grid-template-columns: 1fr;
  }

  .topology-tile,
  .device-tile {
    min-height: 132px;
  }

  .page-bank-label small {
    display: none;
  }
}

.partners-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.partner-card {
  min-height: 260px;
  padding: 22px;
  display: flex;
  flex-direction: column;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--black-card);
  box-shadow: 0 18px 60px rgba(0,0,0,0.24);
}

.partner-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: rgba(212,175,55,0.08);
  color: var(--gold-soft);
  margin-bottom: 18px;
}

.partner-card h3 {
  margin-bottom: 8px;
  font-size: 1.24rem;
}

.partner-card p {
  color: var(--white-soft);
  line-height: 1.6;
  margin-bottom: 18px;
}

.link-tree {
  display: grid;
  gap: 9px;
  margin-top: auto;
}

.tree-link {
  min-height: 42px;
  padding: 0 13px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.03);
  color: var(--white-soft);
  font-weight: 760;
  transition: 160ms ease;
}

.tree-link:hover {
  color: var(--white);
  background: rgba(212,175,55,0.08);
  border-color: rgba(212,175,55,0.40);
  transform: translateX(2px);
}

.footer-note {
  margin-top: 32px;
  padding: 16px;
  border-radius: 18px;
  border: 1px dashed var(--line);
  background: rgba(255,255,255,0.03);
  color: var(--white-soft);
  line-height: 1.65;
}

@media (max-width: 1080px) {
  .i2c-board {
    min-height: auto;
    padding: 22px;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }

  .bus-trace,
  .bus-label,
  .vertical-trace {
    display: none;
  }

  .device-card,
  .device-card.leader,
  .device-card.bq76942,
  .device-card.additional,
  .device-card.ina226,
  .device-card.bq25798 {
    position: relative;
    inset: auto;
    width: auto;
    min-height: 0;
  }

  .device-card.leader {
    grid-column: 1 / -1;
  }

  .i2c-board::after {
    position: relative;
    left: auto;
    bottom: auto;
    grid-column: 1 / -1;
    margin-top: 4px;
  }
}

@media (max-width: 980px) {
  .hero,
  .dashboard-grid,
  .communication-controls .card-body,
  .i2c-log-grid {
    grid-template-columns: 1fr;
  }

  .panel-grid,
  .string-summary,
  .partners-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .transaction-form {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .visual-card {
    min-height: 450px;
  }
}

@media (max-width: 680px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
    padding: 14px 0;
  }

  .nav-links {
    width: 100%;
    justify-content: flex-start;
  }

  .page-shell {
    padding-top: 34px;
  }

  .stats-strip,
  .pack-summary,
  .panel-grid,
  .string-summary,
  .partners-grid,
  .bus-stat-grid,
  .transaction-form {
    grid-template-columns: 1fr;
  }

  .section-header {
    flex-direction: column;
    align-items: flex-start;
  }

  .visual-card {
    min-height: 390px;
  }
}

/* Account controls extend the existing black/gold lab interface. */
.account-panel {
  width: min(480px, calc(100% - 32px));
  margin: 32px auto;
  padding: 24px;
  background: var(--black);
  border: 1px solid var(--gold-deep);
  border-radius: 12px;
}
.account-panel[hidden], #accountForm[hidden], #accountLogout[hidden], #accountRetry[hidden], #accountButton[hidden] { display: none; }
.account-heading { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
.account-heading h1 { margin: 0; font-size: 1.5rem; }
.account-panel p { color: var(--white-soft); line-height: 1.6; overflow-wrap: anywhere; }
.account-panel form { display: grid; gap: 10px; }
.account-panel label:not(:first-child) { margin-block-start: 12px; }
.account-panel input { min-width: 0; width: 100%; padding: 12px; font-size: 16px; background: var(--black); color: var(--white); border: 1px solid var(--gold-deep); border-radius: 6px; caret-color: var(--gold); }
.account-panel button, #accountButton { min-height: 44px; padding: 10px 16px; background: var(--black); color: var(--gold-soft); border: 1px solid var(--gold-deep); border-radius: 6px; cursor: pointer; font-size: 16px; }
.account-panel button:hover, #accountButton:hover { border-color: var(--gold); }
.account-panel button:disabled { opacity: .65; cursor: wait; }
.account-panel :focus-visible, #accountButton:focus-visible { outline: 2px solid var(--gold-soft); outline-offset: 3px; }
#accountSubmit { margin-block-start: 14px; background: var(--gold); color: var(--black); font-weight: 700; }
#accountMessage:empty { display: none; }
#accountMessage { color: var(--warning); }