:root {
  --color-bg: #121212;
  --color-surface: #212121;
  --color-text: #e8edf2;
  --color-text-muted: #9aa7b3;
  --color-accent: #ffffff;
  --color-border: #2a323b;
  --color-danger: #ef4444;

  --font-sans: "Metropolis", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --line-height: 1.6;
  --font-weight-bold: 700;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 4rem;

  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-none: 0;
  --color-accent-dark: #d9d9d9;

  --transition-fast: 0.2s ease;

  --z-header: 10;

  --header-height: 4rem;
  --max-width: 72rem;

  --nav-toggle-size: 2.75rem;
  --nav-toggle-gap: 5px;
  --nav-toggle-bar-height: 2px;
  --nav-toggle-bar-offset: 7px;
  --nav-toggle-padding: 0.5rem;
}

@font-face {
  font-family: "Metropolis";
  src: url("assets/fonts/Metropolis-Regular.otf") format("opentype");
  font-weight: 400;
  font-display: swap;
}

@font-face {
  font-family: "Metropolis";
  src: url("assets/fonts/Metropolis-Bold.otf") format("opentype");
  font-weight: 700;
  font-display: swap;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  line-height: var(--line-height);
  color: var(--color-text);
  background-color: var(--color-bg);
}

a {
  color: var(--color-accent);
}

a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.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;
}

header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  height: var(--header-height);
  background-color: var(--color-surface);
}

.brand {
  display: flex;
  align-items: center;
  padding-inline: var(--space-5);
  text-decoration: none;
}

.brand img {
  display: block;
  height: 3rem;
  width: auto;
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: var(--nav-toggle-gap);
  width: var(--nav-toggle-size);
  height: var(--nav-toggle-size);
  padding: var(--nav-toggle-padding);
  background: none;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
  cursor: pointer;
  margin-inline-end: var(--space-5);
}

.nav-toggle__bar {
  display: block;
  width: 100%;
  height: var(--nav-toggle-bar-height);
  border-radius: 1px;
  background-color: var(--color-text);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(1) {
  transform: translateY(var(--nav-toggle-bar-offset)) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar:nth-child(3) {
  transform: translateY(calc(-1 * var(--nav-toggle-bar-offset))) rotate(-45deg);
}

#primary-nav {
  display: flex;
  align-items: stretch;
  align-self: stretch;
}

#primary-nav ul {
  display: flex;
  height: 100%;
  list-style: none;
}

#primary-nav li {
  height: 100%;
}

#primary-nav a {
  display: flex;
  align-items: center;
  height: 100%;
  padding-inline: var(--space-5);
  color: var(--color-text-muted);
  text-decoration: none;
}

#primary-nav a:hover {
  color: var(--color-text);
}

#primary-nav a[aria-current="page"] {
  color: var(--color-text);
  background-color: var(--color-bg);
}

main {
  max-width: var(--max-width);
  margin-inline: auto;
  padding: var(--space-6) var(--space-5) var(--space-7);
  text-align: center;
}

main img {
  display: block;
  margin-inline: auto;
}

/* --- Overview video --- */

.overview-video-frame {
  position: relative;
  width: min(100%, 56rem);
  margin-inline: auto;
  margin-block: 3rem 0;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background-color: var(--color-surface);
  box-shadow: 0 0 3rem rgba(255, 255, 255, 0.08);
}

.overview-video-zoom {
  position: absolute;
  top: 50%;
  left: 50%;
  width: calc(100% * 9 / 16);
  height: calc(100% * 16 / 9);
  transform: translate(-50%, -50%) rotate(-90deg);
  transform-origin: center;
}

.overview-video-zoom video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform-origin: top right;
  transform: scale(1.15);
}

.overview-intro {
  position: relative;
  margin-block-start: 3rem;
}

.overview-features {
  width: min(100%, 56rem);
  margin-inline: auto;
  margin-block: 3rem 0;
  padding: var(--space-5) var(--space-6);
  background-color: var(--color-surface);
  text-align: left;
}

.overview-features h2 {
  text-align: center;
  margin-block-end: var(--space-3);
}

.overview-features p + p {
  margin-block-start: var(--space-3);
}

.overview-reliability {
  width: min(100%, 56rem);
  margin-inline: auto;
  margin-block: 3rem 0;
}

.overview-reliability h2 {
  text-align: center;
  margin-block-end: var(--space-3);
}

.overview-reliability p {
  margin-block-start: var(--space-2);
}

.privacy {
  max-width: 60ch;
  margin-inline: auto;
  text-align: left;
}

.privacy ul {
  padding-inline-start: var(--space-5);
}

.privacy p + p,
.privacy ul + p {
  margin-block-start: var(--space-3);
}

.overview-intro__card {
  position: absolute;
  top: 0;
  bottom: 0;
  left: max(calc(50% - 28rem), 0px);
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: var(--space-5);
  width: 26rem;
  padding: var(--space-6);
  text-align: left;
  background-color: rgba(18, 18, 18, 0.875);
  border: none;
  border-left: 4px solid var(--color-accent);
}

.overview-intro__eyebrow {
  font-size: 0.6875rem;
  font-weight: 400;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-block-end: -1.25rem;
}

.overview-intro__card h2 {
  margin-block-end: -0.75rem;
}

.overview-intro__card p + p {
  margin-block-start: -0.5rem;
}

.overview-intro__cta {
  width: fit-content;
  min-width: 14rem;
  margin-block-start: var(--space-3);
  padding: var(--space-3) var(--space-6);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-bg);
  background-color: var(--color-accent);
  text-decoration: none;
}

.overview-intro__cta:hover,
.overview-intro__cta:focus-visible {
  background-color: var(--color-accent-dark);
}

.overview-stats {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-6);
  width: min(100%, 56rem);
  margin-inline: auto;
  margin-block: 3rem 0;
  text-align: center;
}

.overview-stats__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.overview-stats__value {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  text-transform: uppercase;
  color: var(--color-accent);
}

.overview-stats__label {
  color: var(--color-text-muted);
}

/* --- Contact Form --- */

.contact-layout {
  display: grid;
  grid-template-columns: 3fr 2fr;
  gap: var(--space-6);
  align-items: start;
  margin-block-start: var(--space-6);
}

.contact-layout .contact-form {
  max-width: none;
  margin-inline: 0;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-align: right;
}

.contact-info__link {
  color: var(--color-accent);
  text-decoration: underline;
}

.contact-info__link:hover {
  color: var(--color-text-muted);
}

.contact-form {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  max-width: 40rem;
  margin-inline: auto;
  text-align: left;
}

.contact-form div,
.contact-form fieldset {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.contact-form label {
  font-size: 0.875rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}

.contact-form input[type="text"],
.contact-form input[type="email"],
.contact-form input[type="tel"],
.contact-form textarea {
  width: 100%;
  padding: var(--space-3);
  font-family: var(--font-sans);
  font-size: 1rem;
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-none);
}

.contact-form input:focus-visible,
.contact-form textarea:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.contact-form textarea {
  resize: vertical;
  min-height: 8rem;
}

.contact-form fieldset {
  border: none;
  padding: 0;
  margin: 0;
}

.contact-form legend {
  font-size: 0.875rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
  margin-bottom: var(--space-1);
}

.contact-form fieldset div {
  flex-direction: row;
  align-items: center;
  gap: var(--space-2);
}

.contact-form fieldset input[type="radio"] {
  appearance: none;
  -webkit-appearance: none;
  width: 1rem;
  height: 1rem;
  border: 1px solid var(--color-text-muted);
  border-radius: var(--radius-none);
  cursor: pointer;
}

.contact-form fieldset input[type="radio"]:checked {
  border-color: var(--color-accent);
  background-color: var(--color-accent);
}

.contact-form fieldset label {
  font-size: 0.875rem;
  font-weight: 400;
}

.required-word {
  color: var(--color-danger);
}

.contact-form .contact-form__label-group {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--space-1);
  width: 100%;
}

.required-word {
  font-size: 0.75rem;
  font-weight: 400;
  text-transform: none;
}

.contact-form input:user-invalid,
.contact-form textarea:user-invalid {
  border-color: var(--color-danger);
}

.contact-form button[type="submit"] {
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-bg);
  background-color: var(--color-accent);
  border: none;
  border-radius: var(--radius-none);
  cursor: pointer;
  margin-block-start: var(--space-2);
}

.contact-form button[type="submit"]:hover,
.contact-form button[type="submit"]:focus-visible {
  background-color: var(--color-accent-dark);
}

.contact-form button[type="submit"]:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.contact-form__note {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-align: center;
}

#form-status {
  margin-block-start: var(--space-2);
  font-size: 0.875rem;
}

#form-status[role="status"] {
  color: var(--color-accent);
}

footer {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border);
  color: var(--color-text-muted);
}

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: var(--space-5);
  margin-block-start: var(--space-5);
}

.footer-copy {
  margin: 0;
}

.footer-info {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-1);
}

.footer-info a {
  color: var(--color-text-muted);
}

.footer-info a:hover {
  color: var(--color-text);
}

.footer-info__item {
  margin: 0;
}

.footer-legal {
  text-align: center;
  margin-block-start: var(--space-4);
}

.footer-legal a {
  color: var(--color-text-muted);
}

.footer-legal a:hover {
  color: var(--color-text);
}

.footer-contact {
  display: block;
  width: fit-content;
  min-width: 18rem;
  margin-inline: auto;
  padding: var(--space-3) var(--space-7);
  text-align: center;
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-bg);
  background-color: var(--color-accent);
  text-decoration: none;
}

.footer-contact:hover,
.footer-contact:focus-visible {
  background-color: var(--color-accent-dark);
}

h1, h2, h3, h4, h5, h6 {
  text-transform: uppercase;
}

/* --- Tabs --- */

.tab-list {
  position: relative;
  display: flex;
  justify-content: center;
  gap: var(--space-2);
  margin-block-end: var(--space-6);
}

.tab-list::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(
    to right,
    transparent,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent
  );
}

.tab-list__item {
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}

.tab-list__item:hover {
  color: var(--color-text);
}

.tab-list__item--active,
.tab-list__item[aria-selected="true"] {
  color: var(--color-text);
  border-bottom-color: var(--color-accent);
}

.tab-panel {
  padding-block-start: var(--space-4);
}

.tab-panel__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-6);
  align-items: start;
}

.tab-panel__info {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  text-align: left;
}

.tab-panel__info h3 {
  margin-block-start: var(--space-4);
  font-size: 1rem;
}

.tab-panel__info h3:first-child {
  margin-block-start: 0;
}

.machines-intro {
  max-width: 60ch;
  margin-inline: auto;
  margin-block-end: var(--space-6);
  text-align: left;
}

.machines-intro p + p {
  margin-block-start: var(--space-3);
}

.tab-panel__layout .machines-intro {
  max-width: none;
  margin-inline: 0;
  margin-block-end: 0;
}

.tab-panel__heading {
  margin-block-end: var(--space-4);
  font-size: 1rem;
  color: var(--color-text);
}

.tab-panel__new {
  margin-block-end: var(--space-6);
}

.tab-panel__new .tab-panel__layout {
  gap: var(--space-2);
}

.tab-panel__new img {
  display: block;
  width: 70%;
  height: auto;
  margin-inline: auto;
}

.tab-panel__compare {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.tab-panel__compare h3 {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

.tab-panel__compare .tab-panel__media img,
.tab-panel__compare video {
  display: block;
  width: 70%;
  aspect-ratio: 9 / 16;
  object-fit: cover;
  height: auto;
  margin-inline: auto;
}

.tab-panel__layout:has(> .tab-panel__compare) {
  position: relative;
  gap: var(--space-3);
}

.tab-panel__layout:has(> .tab-panel__compare)::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 50%;
  width: 1px;
  background: linear-gradient(
    to bottom,
    transparent,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent
  );
}

.tab-panel__media img {
  display: block;
  width: 70%;
  height: auto;
  margin-inline-end: 0;
  margin-inline-start: auto;
  margin-block-end: var(--space-4);
}

.tab-panel__media__zoom {
  width: 70%;
  aspect-ratio: 3785 / 2523;
  height: auto;
  margin-inline-end: 0;
  margin-inline-start: auto;
  margin-block-end: var(--space-4);
  overflow: hidden;
}

.tab-panel__media__zoom img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.5);
  transform-origin: center;
}

@media (max-width: 768px) {

/* Breakpoint: 768px — custom properties don't resolve reliably inside media
   query conditions, so the breakpoint is written as a literal here. */
  .nav-toggle {
    display: flex;
  }

  #primary-nav {
    position: absolute;
    top: var(--header-height);
    right: var(--space-5);
    left: var(--space-5);
    display: none;
    padding: var(--space-4);
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-none);
  }

  #primary-nav.is-open {
    display: block;
  }

  #primary-nav ul {
    flex-direction: column;
    gap: var(--space-1);
  }

  #primary-nav a {
    display: block;
    width: 100%;
    padding-block: var(--space-3);
  }

  .tab-panel__layout {
    grid-template-columns: 1fr;
  }

  .tab-panel__layout:has(> .tab-panel__compare)::before {
    display: none;
  }

  .contact-layout {
    grid-template-columns: 1fr;
  }

  .contact-info {
    text-align: center;
  }

  .tab-panel__media img {
    margin-inline: auto;
  }

  .tab-panel__media__zoom {
    margin-inline: auto;
  }

  .tab-panel__new .tab-panel__media img {
    margin-inline: auto;
  }

  .overview-intro {
    display: flex;
    flex-direction: column;
  }

  .overview-intro__card {
    order: -1;
    position: static;
    transform: none;
    width: 100%;
    margin-inline: auto;
    background-color: var(--color-bg);
    border: none;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: center;
  }

  .footer-info {
    align-items: center;
  }
}