:root,
:root[data-theme="light"] {
  --color-background: #F7F9FC;
  --color-surface: #FFFFFF;
  --color-text: #17212B;
  --color-muted: #5B6773;
  --color-accent: #0F766E;
  --color-success: #16803C;
  --color-error: #B42318;
  --shadow-soft: 0 20px 50px color-mix(in srgb, var(--color-text) 12%, transparent);
}

:root[data-theme="dark"] {
  --color-background: #101820;
  --color-surface: #17212B;
  --color-text: #F3F7FB;
  --color-muted: #A8B3BE;
  --color-accent: #5ED3C6;
  --color-success: #58D68D;
  --color-error: #FF8A80;
  --shadow-soft: 0 20px 50px color-mix(in srgb, var(--color-text) 8%, transparent);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-width: 0;
  background: var(--color-background);
  color: var(--color-text);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.55;
}

body.modal-open {
  overflow: hidden;
}

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

button,
input,
select,
textarea {
  font: inherit;
}

button {
  cursor: pointer;
}

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.container {
  width: min(100% - 48px, 1120px);
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: color-mix(in srgb, var(--color-background) 90%, transparent);
  border-bottom: 1px solid color-mix(in srgb, var(--color-muted) 24%, transparent);
  backdrop-filter: blur(16px);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  min-height: 72px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.2;
}

.brand__mark {
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--color-accent);
  box-shadow: inset 0 0 0 6px color-mix(in srgb, var(--color-surface) 40%, transparent);
}

.header__nav,
.footer__inner nav {
  display: flex;
  align-items: center;
  gap: 24px;
  color: var(--color-muted);
  font-size: 14px;
  font-weight: 500;
}

.header__nav a:hover,
.footer__inner a:hover {
  color: var(--color-accent);
}

.section {
  padding: 88px 0;
}

.section--surface {
  background: color-mix(in srgb, var(--color-surface) 64%, var(--color-background));
}

.hero {
  padding-top: 72px;
}

.hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(320px, 0.95fr);
  gap: 40px;
  align-items: center;
}

.hero__content {
  max-width: 680px;
}

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

h1 {
  margin-bottom: 24px;
  font-size: 44px;
  font-weight: 700;
  line-height: 1.12;
}

h2 {
  margin-bottom: 12px;
  font-size: 30px;
  font-weight: 700;
  line-height: 1.2;
}

h3 {
  margin-bottom: 8px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.25;
}

.hero__lead,
.section__heading p {
  color: var(--color-muted);
  font-size: 20px;
  font-weight: 500;
  line-height: 1.45;
}

.hero__lead {
  max-width: 620px;
  margin-bottom: 32px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 12px 20px;
  border: 1px solid transparent;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 500;
  line-height: 1.2;
  transition: transform 160ms ease, border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

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

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

.button--primary {
  background: var(--color-accent);
  color: var(--color-surface);
  box-shadow: 0 12px 28px color-mix(in srgb, var(--color-accent) 28%, transparent);
}

.button--primary:hover {
  box-shadow: 0 16px 34px color-mix(in srgb, var(--color-accent) 36%, transparent);
}

.button--secondary {
  background: var(--color-surface);
  color: var(--color-text);
  border-color: color-mix(in srgb, var(--color-muted) 28%, transparent);
}

.button--secondary:hover {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 9%, var(--color-surface));
}

.button--wide {
  width: 100%;
}

.hero__panel,
.request-form,
.tabs,
.controls-grid {
  border: 1px solid color-mix(in srgb, var(--color-muted) 22%, transparent);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

.hero__panel {
  display: grid;
  gap: 16px;
  padding: 24px;
}

.status-card,
.metric,
.device-card {
  border: 1px solid color-mix(in srgb, var(--color-muted) 22%, transparent);
  border-radius: 8px;
  background: color-mix(in srgb, var(--color-surface) 88%, var(--color-background));
}

.status-card {
  display: grid;
  gap: 8px;
  padding: 24px;
}

.status-card--accent {
  border-color: color-mix(in srgb, var(--color-accent) 42%, transparent);
  background: color-mix(in srgb, var(--color-accent) 10%, var(--color-surface));
}

.status-card strong {
  font-size: 30px;
  line-height: 1.2;
}

.metric-grid,
.device-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.metric {
  display: grid;
  gap: 6px;
  padding: 18px;
}

.metric strong {
  font-size: 20px;
  line-height: 1.25;
}

.metric span:last-child,
.status-card span:last-child,
.device-card p,
.caption,
.hint {
  color: var(--color-muted);
}

.caption,
.hint,
.error-message,
.form-status {
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
}

.caption {
  text-transform: uppercase;
}

.section__heading {
  max-width: 700px;
  margin-bottom: 40px;
}

.section__heading p {
  margin-bottom: 0;
}

.controls-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px;
  padding: 24px;
}

.field,
.fieldset {
  display: grid;
  gap: 8px;
  min-width: 0;
}

label,
legend {
  color: var(--color-text);
  font-size: 14px;
  font-weight: 500;
  line-height: 1.4;
}

fieldset {
  margin: 0;
  padding: 0;
  border: 0;
}

input[type="text"],
input[type="email"],
input[type="number"],
select,
textarea {
  width: 100%;
  min-height: 48px;
  padding: 11px 12px;
  border: 1px solid color-mix(in srgb, var(--color-muted) 30%, transparent);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 16px;
  line-height: 1.55;
  transition: border-color 160ms ease, background-color 160ms ease, box-shadow 160ms ease;
}

textarea {
  min-height: 120px;
  resize: vertical;
}

input:hover,
select:hover,
textarea:hover {
  border-color: color-mix(in srgb, var(--color-accent) 56%, var(--color-muted));
}

input:active,
select:active,
textarea:active {
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--color-accent) 34%, transparent);
}

input[aria-invalid="true"],
select[aria-invalid="true"],
textarea[aria-invalid="true"] {
  border-color: var(--color-error);
}

.error-message {
  min-height: 20px;
  margin-bottom: 0;
  color: var(--color-error);
}

.hint {
  margin-bottom: 0;
}

.choice {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.choice input {
  width: 20px;
  height: 20px;
  accent-color: var(--color-accent);
}

input[type="range"] {
  width: 100%;
  accent-color: var(--color-accent);
}

.switch {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: fit-content;
}

.switch input {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

.switch__track {
  position: relative;
  width: 52px;
  height: 30px;
  flex: 0 0 auto;
  border: 1px solid color-mix(in srgb, var(--color-muted) 34%, transparent);
  border-radius: 999px;
  background: color-mix(in srgb, var(--color-muted) 20%, var(--color-surface));
  transition: background-color 160ms ease, border-color 160ms ease, box-shadow 160ms ease;
}

.switch__track::after {
  content: "";
  position: absolute;
  top: 3px;
  left: 3px;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--color-surface);
  box-shadow: 0 2px 8px color-mix(in srgb, var(--color-text) 20%, transparent);
  transition: transform 160ms ease;
}

.switch input:checked + .switch__track {
  border-color: var(--color-accent);
  background: var(--color-accent);
}

.switch input:checked + .switch__track::after {
  transform: translateX(22px);
}

.switch input:focus-visible + .switch__track {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.switch:hover .switch__track {
  border-color: var(--color-accent);
}

.switch:active .switch__track {
  box-shadow: inset 0 0 0 2px color-mix(in srgb, var(--color-text) 14%, transparent);
}

.tabs {
  padding: 24px;
}

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 24px;
  border-bottom: 1px solid color-mix(in srgb, var(--color-muted) 22%, transparent);
}

.tab {
  min-height: 44px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: 8px 8px 0 0;
  background: transparent;
  color: var(--color-muted);
  font-size: 16px;
  font-weight: 500;
}

.tab:hover {
  color: var(--color-text);
  background: color-mix(in srgb, var(--color-accent) 9%, transparent);
}

.tab:active {
  transform: translateY(1px);
}

.tab[aria-selected="true"] {
  border-color: color-mix(in srgb, var(--color-accent) 50%, transparent);
  background: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface));
  color: var(--color-text);
}

.tabpanel {
  outline: none;
}

.device-card {
  padding: 20px;
}

.device-card p {
  margin-bottom: 0;
}

.request-layout {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(320px, 1fr);
  gap: 40px;
  align-items: start;
}

.request-form {
  display: grid;
  gap: 18px;
  padding: 24px;
}

.form-status {
  min-height: 20px;
  margin-bottom: 0;
  color: var(--color-success);
}

.form-status.is-error {
  color: var(--color-error);
}

.modal {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
  background: color-mix(in srgb, var(--color-text) 58%, transparent);
}

.modal[hidden] {
  display: none;
}

.modal__dialog {
  position: relative;
  width: min(100%, 520px);
  padding: 32px;
  border: 1px solid color-mix(in srgb, var(--color-muted) 22%, transparent);
  border-radius: 8px;
  background: var(--color-surface);
  box-shadow: var(--shadow-soft);
}

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

.modal__close {
  position: absolute;
  top: 12px;
  right: 12px;
  display: inline-grid;
  width: 40px;
  height: 40px;
  place-items: center;
  border: 1px solid color-mix(in srgb, var(--color-muted) 24%, transparent);
  border-radius: 8px;
  background: var(--color-surface);
  color: var(--color-text);
  font-size: 28px;
  line-height: 1;
}

.modal__close:hover {
  border-color: var(--color-accent);
  background: color-mix(in srgb, var(--color-accent) 9%, var(--color-surface));
}

.site-footer {
  padding: 40px 0;
  border-top: 1px solid color-mix(in srgb, var(--color-muted) 24%, transparent);
}

.footer__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  color: var(--color-muted);
}

.footer__inner p {
  margin-bottom: 0;
  font-size: 14px;
}

@media (max-width: 760px) {
  .container {
    width: min(100% - 32px, 1120px);
  }

  .header__inner,
  .footer__inner,
  .header__nav,
  .footer__inner nav {
    align-items: flex-start;
  }

  .header__inner {
    flex-wrap: wrap;
    padding: 16px 0;
  }

  .header__nav,
  .footer__inner,
  .footer__inner nav {
    flex-wrap: wrap;
    gap: 12px 16px;
  }

  .theme-switch {
    margin-left: auto;
  }

  .section {
    padding: 64px 0;
  }

  .hero {
    padding-top: 48px;
  }

  .hero__grid,
  .controls-grid,
  .request-layout,
  .metric-grid,
  .device-list {
    grid-template-columns: 1fr;
  }

  h1 {
    font-size: 34px;
  }

  h2 {
    font-size: 26px;
  }

  .hero__lead,
  .section__heading p {
    font-size: 18px;
  }

  .hero__panel,
  .controls-grid,
  .tabs,
  .request-form,
  .modal__dialog {
    padding: 20px;
  }

  .hero__actions,
  .button {
    width: 100%;
  }
}

@media (max-width: 420px) {
  .brand {
    width: 100%;
  }

  .theme-switch {
    margin-left: 0;
  }

  .header__nav {
    width: 100%;
  }

  .switch__label {
    max-width: 180px;
  }
}