:root {
  --bg: #061019;
  --bg-soft: #0a1520;
  --panel: rgba(12, 26, 38, 0.82);
  --panel-solid: #0d1b27;
  --line: rgba(151, 191, 216, 0.14);
  --line-strong: rgba(112, 216, 255, 0.25);
  --text: #f3f8fb;
  --muted: #91a8b9;
  --cyan: #29d8ff;
  --blue: #4285ff;
  --green: #39df91;
  --yellow: #ffd45c;
  --red: #ff5c6b;
  --shadow: 0 32px 90px rgba(0,0,0,.34);
  --radius: 26px;

  --esp-tools-button-color: #2e9cff;
  --esp-tools-button-text-color: #ffffff;
  --esp-tools-button-border-radius: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--text);
  background:
    radial-gradient(circle at 50% -10%, rgba(29, 130, 255, .12), transparent 34rem),
    linear-gradient(180deg, #061019 0%, #07121b 45%, #050c12 100%);
  font-family:
    Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont,
    "Segoe UI", sans-serif;
  line-height: 1.55;
  overflow-x: hidden;
}

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

button,
input,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

code {
  color: #bceeff;
}

.ambient {
  position: fixed;
  width: 36rem;
  height: 36rem;
  border-radius: 999px;
  filter: blur(110px);
  opacity: .12;
  pointer-events: none;
  z-index: -1;
}

.ambient-one {
  background: #1ba6ff;
  top: 14rem;
  left: -20rem;
}

.ambient-two {
  background: #21e4aa;
  right: -24rem;
  top: 52rem;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  width: min(1180px, calc(100% - 32px));
  margin: 16px auto 0;
  padding: 12px 16px;
  border: 1px solid var(--line);
  border-radius: 20px;
  background: rgba(6, 16, 25, .72);
  backdrop-filter: blur(20px);
  box-shadow: 0 12px 40px rgba(0,0,0,.18);
}

.brand {
  display: flex;
  align-items: center;
  gap: 11px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: linear-gradient(145deg, #28dfff, #2675ff);
  color: white;
  font-weight: 850;
  font-size: 13px;
  letter-spacing: .04em;
  box-shadow: 0 0 35px rgba(41, 216, 255, .22);
}

.brand strong,
.brand small {
  display: block;
}

.brand strong {
  font-size: 14px;
}

.brand small {
  color: var(--muted);
  font-size: 11px;
  margin-top: 1px;
}

nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

nav a {
  padding: 9px 12px;
  border-radius: 12px;
  color: var(--muted);
  font-size: 13px;
  transition: .2s ease;
}

nav a:hover {
  color: var(--text);
  background: rgba(255,255,255,.045);
}

main {
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
}

.hero {
  min-height: 720px;
  display: grid;
  grid-template-columns: 1.08fr .92fr;
  align-items: center;
  gap: 5rem;
  padding: 72px 0 54px;
}

.eyebrow,
.kicker {
  color: #79dfff;
  text-transform: uppercase;
  letter-spacing: .13em;
  font-size: 11px;
  font-weight: 800;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 11px;
  border: 1px solid rgba(75, 211, 255, .16);
  border-radius: 999px;
  background: rgba(43, 182, 255, .055);
}

.status-dot {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--green);
  box-shadow: 0 0 15px rgba(57, 223, 145, .75);
}

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

h1 {
  max-width: 760px;
  margin: 24px 0 22px;
  font-size: clamp(46px, 6.6vw, 82px);
  line-height: .98;
  letter-spacing: -.055em;
}

h1 span {
  display: block;
  background: linear-gradient(90deg, #f2f8fb, #7ddfff 60%, #43f0b4);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  max-width: 660px;
  color: var(--muted);
  font-size: clamp(17px, 2vw, 20px);
}

.hero-actions {
  display: flex;
  gap: 12px;
  margin-top: 32px;
  flex-wrap: wrap;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 17px;
  border: 1px solid transparent;
  border-radius: 14px;
  color: white;
  font-weight: 750;
  font-size: 14px;
  transition: transform .18s ease, border-color .18s ease, background .18s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button.primary {
  background: linear-gradient(135deg, #208fff, #2acaf2);
  box-shadow: 0 13px 35px rgba(31, 143, 255, .2);
}

.button.secondary {
  border-color: var(--line);
  background: rgba(255,255,255,.035);
}

.button.danger-ghost {
  border-color: rgba(255, 92, 107, .2);
  background: rgba(255, 92, 107, .055);
  color: #ff9ba5;
}

.button.large {
  min-height: 54px;
  padding: 0 23px;
  font-size: 15px;
}

.privacy-pill {
  display: flex;
  align-items: center;
  gap: 9px;
  margin-top: 27px;
  color: #8199aa;
  font-size: 12px;
}

.privacy-pill svg {
  width: 18px;
  fill: #5ebfd8;
}

.display-mock {
  display: grid;
  place-items: center;
  min-height: 480px;
  perspective: 900px;
}

.display-ring {
  position: relative;
  width: min(420px, 80vw);
  aspect-ratio: 1;
  border-radius: 50%;
  padding: 18px;
  background:
    conic-gradient(
      from -90deg,
      #ff5363 0deg,
      #ffb43c 90deg,
      #ffe34c 150deg,
      #5ee17f 245deg,
      #263541 245deg,
      #263541 360deg
    );
  box-shadow:
    0 0 90px rgba(66, 133, 255, .14),
    0 44px 80px rgba(0,0,0,.42);
  transform: rotateY(-5deg) rotateX(2deg);
}

.display-ring::before {
  content: "";
  position: absolute;
  inset: -16px;
  border: 1px solid rgba(126, 218, 255, .12);
  border-radius: inherit;
}

.display-face {
  position: relative;
  display: grid;
  justify-items: center;
  align-content: center;
  width: 100%;
  height: 100%;
  border-radius: 50%;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 40%, #10202c 0%, #071017 62%, #050b10 100%);
  border: 5px solid #0a1218;
}

.mock-status {
  position: absolute;
  top: 35px;
  padding: 7px 15px;
  border-radius: 99px;
  background: #102531;
  color: #45c8ff;
  font-weight: 800;
  font-size: 12px;
  letter-spacing: .04em;
}

.mock-progress {
  margin-top: -26px;
  font-size: 76px;
  line-height: 1;
  letter-spacing: -.07em;
  font-weight: 800;
}

.mock-progress span {
  margin-left: 2px;
  color: #9fd7e8;
  font-size: 34px;
}

.mock-layer {
  margin-top: 8px;
  color: #8299a9;
  font-size: 13px;
}

.mock-time {
  display: grid;
  justify-items: center;
  margin-top: 20px;
}

.mock-time strong {
  font-size: 24px;
}

.mock-time small {
  color: #758e9f;
  font-size: 9px;
  letter-spacing: .08em;
}

.mock-time em {
  color: #60d9eb;
  font-size: 10px;
  font-style: normal;
}

.mock-temperatures {
  display: flex;
  gap: 12px;
  margin-top: 13px;
}

.mock-temperatures div {
  min-width: 88px;
  padding: 9px 12px;
  border-radius: 12px;
  background: #10212c;
  text-align: center;
}

.mock-temperatures small {
  display: block;
  color: #7f9aab;
  font-size: 9px;
}

.mock-temperatures strong {
  font-size: 17px;
}

.mock-temperatures div:first-child strong {
  color: #ffb05d;
}

.mock-temperatures div:last-child strong {
  color: #62dbf1;
}

.section {
  padding: 90px 0;
}

.section-heading {
  max-width: 690px;
  margin-bottom: 34px;
}

.section-heading h2,
.about-grid h2 {
  margin: 9px 0 12px;
  font-size: clamp(34px, 4.5vw, 54px);
  line-height: 1.05;
  letter-spacing: -.04em;
}

.section-heading p,
.about-copy p {
  color: var(--muted);
}

.steps {
  display: grid;
  gap: 18px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(17, 34, 47, .78), rgba(8, 20, 29, .82));
  box-shadow: 0 20px 55px rgba(0,0,0,.16);
  backdrop-filter: blur(14px);
}

.step-card {
  position: relative;
  padding: 28px;
}

.step-number {
  position: absolute;
  top: 24px;
  right: 24px;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: rgba(50, 188, 255, .08);
  border: 1px solid rgba(81, 202, 255, .16);
  color: #64d8ff;
  font-size: 13px;
  font-weight: 800;
}

.card-heading {
  padding-right: 60px;
  margin-bottom: 22px;
}

.card-heading h3 {
  margin-bottom: 5px;
  font-size: 20px;
}

.card-heading p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 14px;
}

.board-options {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.board-option {
  position: relative;
  min-height: 122px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255,255,255,.025);
  text-align: left;
  color: inherit;
  transition: .18s ease;
}

.board-option:hover {
  border-color: rgba(91, 206, 255, .28);
  background: rgba(57, 187, 255, .045);
}

.board-option.selected {
  border-color: rgba(65, 204, 255, .48);
  background: linear-gradient(180deg, rgba(41, 176, 255, .11), rgba(37, 122, 255, .045));
  box-shadow: inset 0 0 0 1px rgba(77, 213, 255, .07);
}

.board-option strong,
.board-option span {
  display: block;
}

.board-option strong {
  margin-bottom: 6px;
  font-size: 15px;
}

.board-option span {
  color: var(--muted);
  font-size: 12px;
}

.board-chip {
  display: inline-flex !important;
  width: max-content;
  margin-bottom: 17px;
  padding: 4px 8px;
  border-radius: 99px;
  background: rgba(52, 215, 255, .08);
  color: #6cdcff !important;
  font-size: 10px !important;
  font-weight: 800;
  letter-spacing: .06em;
}

.board-summary {
  display: none;
  margin-top: 14px;
  padding: 14px 16px;
  border-radius: 14px;
  color: #a5bdca;
  background: rgba(255,255,255,.025);
  font-size: 13px;
}

.board-summary.visible {
  display: block;
}

.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 17px;
}

label {
  display: grid;
  gap: 7px;
  color: #a9bfcc;
  font-size: 12px;
  font-weight: 700;
}

.full-width {
  grid-column: 1 / -1;
}

input,
select {
  width: 100%;
  min-height: 49px;
  padding: 0 13px;
  border: 1px solid var(--line);
  border-radius: 13px;
  outline: none;
  color: var(--text);
  background: rgba(3, 12, 19, .52);
  transition: .18s ease;
}

input:focus,
select:focus {
  border-color: rgba(70, 205, 255, .48);
  box-shadow: 0 0 0 4px rgba(48, 190, 255, .07);
}

select option {
  background: #0b1822;
}

.password-field {
  position: relative;
}

.password-field input {
  padding-right: 68px;
}

.reveal {
  position: absolute;
  right: 7px;
  top: 7px;
  height: 35px;
  padding: 0 10px;
  border: 0;
  border-radius: 9px;
  color: #7fcfe7;
  background: rgba(87, 203, 255, .07);
  font-size: 11px;
  font-weight: 750;
}

.flash-area {
  display: grid;
  justify-items: start;
  gap: 13px;
}

.fine-print {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

.browser-warning {
  display: block;
  padding: 14px;
  border: 1px solid rgba(255, 179, 72, .22);
  border-radius: 13px;
  background: rgba(255, 179, 72, .06);
  color: #ffd28a;
  font-size: 13px;
}

.config-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.serial-status {
  display: flex;
  align-items: flex-start;
  gap: 13px;
  margin-top: 18px;
  padding: 15px;
  border: 1px solid var(--line);
  border-radius: 15px;
  background: rgba(0,0,0,.12);
}

.status-icon {
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
  flex: 0 0 auto;
}

.status-icon.idle {
  background: #526979;
}

.status-icon.working {
  background: var(--yellow);
  box-shadow: 0 0 13px rgba(255, 212, 92, .45);
}

.status-icon.success {
  background: var(--green);
  box-shadow: 0 0 13px rgba(57, 223, 145, .45);
}

.status-icon.error {
  background: var(--red);
  box-shadow: 0 0 13px rgba(255, 92, 107, .45);
}

.serial-status strong {
  font-size: 13px;
}

.serial-status p {
  margin: 2px 0 0;
  color: var(--muted);
  font-size: 12px;
}

.serial-console {
  margin-top: 13px;
  border-top: 1px solid var(--line);
  padding-top: 13px;
}

.serial-console summary {
  cursor: pointer;
  color: #8ca5b5;
  font-size: 12px;
}

.serial-console pre {
  max-height: 240px;
  overflow: auto;
  padding: 14px;
  border-radius: 13px;
  color: #9fcedd;
  background: #030a0f;
  font: 11px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace;
  white-space: pre-wrap;
}

.wiring-card {
  position: relative;
  overflow: hidden;
  min-height: 380px;
  padding: 30px;
}

.wiring-card.locked .wiring-content {
  filter: blur(8px);
  opacity: .12;
  pointer-events: none;
}

.wiring-card:not(.locked) .wiring-locked {
  display: none;
}

.wiring-locked {
  position: absolute;
  inset: 0;
  z-index: 2;
  display: grid;
  place-items: center;
  align-content: center;
  text-align: center;
  background: rgba(7, 17, 25, .68);
  backdrop-filter: blur(4px);
}

.wiring-locked h3 {
  margin: 11px 0 5px;
}

.wiring-locked p {
  color: var(--muted);
}

.lock-icon {
  display: grid;
  place-items: center;
  width: 56px;
  height: 56px;
  border-radius: 18px;
  background: rgba(43, 208, 255, .08);
  color: #62dcff;
  font-size: 28px;
}

.wiring-content {
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 32px;
}

.wiring-title-row {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 20px;
}

.wiring-title-row h3 {
  margin: 7px 0 0;
  font-size: 26px;
}

.chip-badge {
  padding: 6px 9px;
  border: 1px solid rgba(76, 214, 255, .18);
  border-radius: 999px;
  color: #6fdfff;
  background: rgba(50, 198, 255, .06);
  font-size: 10px;
  font-weight: 850;
}

.pinout-table {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 16px;
}

.pin-row {
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 13px;
  min-height: 47px;
  padding: 0 14px;
  border-bottom: 1px solid var(--line);
}

.pin-row:last-child {
  border-bottom: 0;
}

.pin-row span {
  font-size: 13px;
}

.pin-row .from {
  color: #a8bdca;
}

.pin-row .arrow {
  color: #3b9fbd;
}

.pin-row .to {
  color: #f3f8fb;
  font-weight: 750;
  text-align: right;
}

.wiring-notes {
  display: grid;
  gap: 7px;
  margin-top: 14px;
}

.wiring-note {
  padding: 10px 12px;
  border-left: 2px solid #2ab8df;
  color: #8fa8b8;
  background: rgba(44, 178, 218, .035);
  font-size: 12px;
}

.board-visual {
  display: grid;
  place-items: center;
  min-height: 320px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 20px;
  background:
    radial-gradient(circle at 50% 45%, rgba(44, 197, 255, .08), transparent 55%),
    #071018;
}

.board-visual img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  max-height: 390px;
}

.generic-board {
  display: grid;
  place-items: center;
  width: 180px;
  height: 285px;
  border: 2px solid #25556c;
  border-radius: 16px;
  background: linear-gradient(180deg, #0c4a55, #07333b);
  box-shadow: 0 24px 60px rgba(0,0,0,.34);
}

.generic-board::before {
  content: attr(data-label);
  color: #d9f6ff;
  font-size: 15px;
  font-weight: 800;
  text-align: center;
  padding: 20px;
}

.gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 17px;
}

.gallery-card {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
}

.gallery-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1.52;
  object-fit: cover;
  border-bottom: 1px solid var(--line);
}

.gallery-card figcaption {
  display: grid;
  gap: 4px;
  padding: 16px 18px 18px;
}

.gallery-card strong {
  font-size: 14px;
}

.gallery-card span {
  color: var(--muted);
  font-size: 11px;
}

.about-section {
  padding-bottom: 110px;
}

.about-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
  align-items: start;
  padding: 38px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background:
    radial-gradient(circle at 0 0, rgba(43, 195, 255, .08), transparent 28rem),
    rgba(10, 23, 33, .7);
}

.about-copy p:last-child {
  margin-bottom: 0;
}

footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  width: min(1180px, calc(100% - 32px));
  margin: 0 auto;
  padding: 28px 0 40px;
  border-top: 1px solid var(--line);
  color: #738b9a;
  font-size: 12px;
}

footer strong,
footer span {
  display: block;
}

footer strong {
  color: #a4bbc8;
}

@media (max-width: 900px) {
  nav {
    display: none;
  }

  .hero {
    grid-template-columns: 1fr;
    gap: 1rem;
    padding-top: 70px;
  }

  .display-mock {
    min-height: 430px;
  }

  .board-options,
  .gallery-grid {
    grid-template-columns: 1fr;
  }

  .wiring-content,
  .about-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 650px) {
  .topbar {
    margin-top: 9px;
  }

  .hero {
    min-height: auto;
    padding-top: 62px;
  }

  h1 {
    font-size: 49px;
  }

  .section {
    padding: 65px 0;
  }

  .step-card {
    padding: 22px 18px;
  }

  .form-grid {
    grid-template-columns: 1fr;
  }

  .full-width {
    grid-column: auto;
  }

  .config-actions {
    align-items: stretch;
  }

  .config-actions .button {
    width: 100%;
  }

  .display-ring {
    width: min(355px, 88vw);
  }

  footer {
    flex-direction: column;
  }
}