:root {
  --bg-mono: #111111;
  --bg-mono-dark: #050505;
  --bg-mono-mid: #5f5f5f;
  --bg-mono-light: #f2f2f2;
  --panel-paper: #f6f4ef;
  --text-ink: #111111;
  --text-ink-muted: rgba(17, 17, 17, 0.52);
  --text-paper: #f3f1ec;
  --text-paper-muted: rgba(243, 241, 236, 0.64);
  --font-display: "Baskerville", "Iowan Old Style", "Palatino Linotype", serif;
  --font-sans: "Avenir Next", "Helvetica Neue", sans-serif;
  --shadow-panel: -10px 0 30px rgba(0, 0, 0, 0.16);
  --fan-speed: 8s;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  background:
    radial-gradient(circle at 22% 28%, rgba(255, 255, 255, 0.06), transparent 18%),
    radial-gradient(circle at 78% 20%, rgba(255, 255, 255, 0.03), transparent 18%),
    linear-gradient(145deg, #1d1d1d 0%, #0b0b0b 55%, #000000 100%);
  color: var(--text-paper);
  font-family: var(--font-sans);
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  height: 100dvh;
  overflow: hidden;
  display: flex;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle, rgba(255, 255, 255, 0.08) 0 1px, transparent 1.3px 100%);
  background-size: 18px 18px;
  mask-image: linear-gradient(135deg, transparent 8%, rgba(0, 0, 0, 0.95) 36%, transparent 74%);
  opacity: 0.18;
}

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

.hero-section {
  --fan-size: 128vmin;
  flex: 1;
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.fan-container {
  width: var(--fan-size);
  height: var(--fan-size);
  position: absolute;
  left: calc(50% - (var(--fan-size) / 2));
  top: calc(50% - (var(--fan-size) / 2));
  animation: rotate var(--fan-speed) linear infinite;
  transform-origin: center center;
  filter:
    drop-shadow(2px 4px 8px rgba(0, 0, 0, 0.35))
    drop-shadow(-1px -1px 2px rgba(255, 255, 255, 0.03));
}

.blade {
  fill: url(#blade-gradient);
}

.hub {
  fill: #1a1a1a;
}

.hub-core {
  fill: #f3f3f3;
}

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

.hero-branding {
  position: absolute;
  bottom: clamp(52px, 6vh, 72px);
  left: 42px;
  z-index: 10;
  max-width: 420px;
}

.hero-branding h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 5rem;
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--text-paper);
  margin: 0.4rem 0 0.8rem;
}

.hero-tagline {
  color: var(--text-paper-muted);
  font-size: 1rem;
  line-height: 1.8;
}

.label-micro {
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-weight: 600;
}

.hero-branding .label-micro {
  color: var(--text-paper-muted);
}

.control-panel {
  width: 480px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent 18%),
    var(--panel-paper);
  color: var(--text-ink);
  box-shadow: var(--shadow-panel);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 56px;
  position: relative;
  z-index: 20;
}

.panel-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
}

.lang-switch {
  margin-top: 12px;
  display: inline-flex;
  gap: 6px;
  align-self: flex-end;
}

.lang-btn {
  border: 1px solid rgba(17, 17, 17, 0.22);
  background: transparent;
  color: rgba(17, 17, 17, 0.68);
  font-family: var(--font-sans);
  font-size: 0.7rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 6px 10px;
  cursor: pointer;
  transition: all 0.2s ease;
}

.lang-btn.active {
  color: var(--panel-paper);
  background: var(--text-ink);
  border-color: var(--text-ink);
}

.system-status {
  display: flex;
  align-items: center;
  gap: 8px;
}

.status-dot {
  width: 4px;
  height: 4px;
  background-color: var(--text-ink);
  border-radius: 50%;
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% {
    opacity: 0.3;
  }
  50% {
    opacity: 1;
  }
  100% {
    opacity: 0.3;
  }
}

.telemetry-primary {
  margin-top: 74px;
  margin-bottom: 46px;
}

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

.support-title {
  margin-top: 14px;
  font-family: var(--font-sans);
  font-size: 1.88rem;
  font-weight: 600;
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--text-ink);
}

.telemetry-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 28px;
}

.meta-head {
  display: flex;
  align-items: center;
  gap: 8px;
}

.meta-icon {
  width: 18px;
  color: var(--text-ink);
  font-size: 0.86rem;
  line-height: 1;
  text-align: center;
}

.meta-group {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}

.meta-value {
  font-family: var(--font-sans);
  font-size: 1.06rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.info-section {
  display: flex;
  flex-direction: column;
  gap: 18px;
}

.panel-copy {
  color: var(--text-ink-muted);
  font-size: 0.98rem;
  line-height: 1.5;
  white-space: nowrap;
}

.free-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border: 1px solid rgba(17, 17, 17, 0.1);
  border-radius: 18px;
  background: rgba(17, 17, 17, 0.03);
}

.free-icon {
  width: 22px;
  font-size: 0.94rem;
  text-align: center;
}

.free-copy {
  display: grid;
  gap: 6px;
}

.free-badge strong {
  font-family: var(--font-sans);
  font-size: 0.98rem;
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--text-ink);
  white-space: nowrap;
}

.feature-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.feature-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 9px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}

.feature-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text-ink-muted);
  font-size: 0.96rem;
  white-space: nowrap;
}

.feature-icon {
  width: 16px;
  color: var(--text-ink);
  font-size: 0.86rem;
  line-height: 1;
  text-align: center;
}

.feature-value {
  font-family: var(--font-sans);
  font-size: 0.96rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  text-align: right;
  white-space: nowrap;
}

.cta-group {
  display: flex;
  gap: 14px;
  flex-wrap: wrap;
}

.cta-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 20px;
  border-radius: 999px;
  border: 1px solid var(--text-ink);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  transition: transform 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

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

.cta-button.primary {
  background: var(--text-ink);
  color: var(--panel-paper);
}

.cta-button.secondary {
  background: transparent;
  color: var(--text-ink);
}

.panel-footer {
  display: flex;
  justify-content: space-between;
  gap: 20px;
  color: var(--text-ink-muted);
  border-top: 1px solid rgba(17, 17, 17, 0.08);
  padding-top: 24px;
  margin-top: 42px;
}

.build-tag {
  margin-top: 14px;
  color: rgba(17, 17, 17, 0.36);
  text-align: right;
}

html[lang="en"] .support-title {
  font-size: 1.54rem;
}

html[lang="en"] .panel-copy,
html[lang="en"] .meta-value,
html[lang="en"] .feature-value {
  font-size: 0.92rem;
  letter-spacing: 0;
}

html[lang="en"] .feature-label {
  font-size: 0.9rem;
}

html[lang="en"] .free-badge strong {
  font-size: 0.9rem;
  line-height: 1.28;
}

@media (min-width: 1180px) and (max-width: 1366px) {
  .hero-section {
    --fan-size: 138vmin;
  }

  .control-panel {
    width: clamp(360px, 30vw, 420px);
    padding: 40px 24px 34px;
  }

  .hero-branding {
    left: 30px;
    bottom: 34px;
    max-width: 330px;
  }

  .hero-branding h1 {
    font-size: 4.25rem;
  }

  .support-title {
    font-size: 1.62rem;
  }

  .panel-copy,
  .free-badge strong,
  .meta-value,
  .feature-label,
  .feature-value {
    white-space: normal;
  }
}

@media (min-width: 1180px) and (max-width: 1366px) and (max-aspect-ratio: 4/3) {
  .hero-section {
    --fan-size: 132vmin;
  }
}

@media (min-width: 1440px) {
  .hero-section {
    --fan-size: 154vmin;
  }

  .fan-container {
    left: calc(50% - (var(--fan-size) / 2));
    top: calc(50% - (var(--fan-size) / 2));
  }

  .control-panel {
    width: 460px;
  }
}

@media (min-width: 1680px) and (min-aspect-ratio: 16/10) {
  .hero-section {
    --fan-size: 172vmin;
  }

  .fan-container {
    left: calc(50% - (var(--fan-size) / 2));
    top: calc(50% - (var(--fan-size) / 2));
  }

  .control-panel {
    width: 440px;
  }
}

@media (min-width: 1280px) and (max-height: 780px) {
  .hero-section {
    --fan-size: 148vmin;
  }

  .fan-container {
    left: calc(50% - (var(--fan-size) / 2));
    top: calc(50% - (var(--fan-size) / 2));
  }

  .hero-branding {
    bottom: 36px;
    max-width: 360px;
  }
}

@media (min-width: 820px) and (max-width: 1179px) {
  .hero-section {
    --fan-size: 136vmin;
  }

  .control-panel {
    width: 380px;
    padding: 36px 24px;
  }

  .hero-branding {
    left: 28px;
    bottom: 30px;
    max-width: 320px;
  }

  .hero-branding h1 {
    font-size: 4.2rem;
  }

  .support-title {
    font-size: 1.52rem;
  }

  .panel-copy,
  .free-badge strong,
  .meta-value,
  .feature-label,
  .feature-value {
    white-space: normal;
  }

  .lang-switch {
    margin-top: 10px;
  }
}

@media (orientation: landscape) and (min-width: 1024px) and (max-width: 1366px) and (hover: none) and (pointer: coarse) {
  body {
    display: flex;
    flex-direction: row;
    overflow: hidden;
  }

  .hero-section {
    --fan-size: clamp(980px, 98vw, 1280px);
    min-height: 100svh;
    min-height: 100dvh;
    flex: 1 1 auto;
    min-width: 0;
  }

  .control-panel {
    width: clamp(320px, 28vw, 380px);
    padding: 22px 16px 16px;
    flex: 0 0 auto;
  }

  .hero-branding {
    left: 20px;
    bottom: 20px;
    max-width: 260px;
  }

  .hero-branding h1 {
    font-size: 3rem;
  }

  .hero-tagline {
    line-height: 1.35;
    font-size: 0.82rem;
  }

  .support-title {
    font-size: 1.16rem;
  }

  .panel-copy,
  .free-badge strong,
  .meta-value,
  .feature-label,
  .feature-value {
    white-space: nowrap;
  }

  .telemetry-primary {
    margin-top: 18px;
    margin-bottom: 14px;
  }

  .info-section {
    gap: 12px;
  }

  .feature-list {
    gap: 8px;
  }

  .meta-group,
  .feature-item {
    padding-bottom: 8px;
  }

  .cta-group {
    gap: 8px;
  }

  .cta-button {
    padding: 10px 12px;
    font-size: 0.7rem;
    letter-spacing: 0.12em;
  }

  .panel-footer {
    margin-top: 14px;
    padding-top: 12px;
  }

  .build-tag {
    margin-top: 8px;
    font-size: 0.6rem;
  }
}

@media (min-width: 820px) and (max-width: 1366px) and (max-height: 700px) {
  body {
    overflow-y: auto;
  }
}

@media (max-width: 819px) {
  body {
    flex-direction: column;
    overflow: auto;
  }

  .hero-section {
    --fan-size: 150vmin;
    min-height: 60vh;
    flex: none;
  }

  .control-panel {
    width: 100%;
    box-shadow: none;
    padding: 40px 24px;
  }

  .fan-container {
    left: calc(50% - (var(--fan-size) / 2));
    top: calc(50% - (var(--fan-size) / 2));
  }

  .hero-branding {
    bottom: 24px;
    left: 24px;
  }

  .hero-branding h1 {
    font-size: 4rem;
  }

  .support-title {
    font-size: 1.6rem;
  }

  .lang-switch {
    align-self: flex-start;
    margin-top: 10px;
  }
}

@media (max-width: 640px) {
  .hero-branding {
    max-width: 280px;
  }

  .hero-branding h1 {
    font-size: 3.2rem;
  }

  .hero-tagline {
    font-size: 0.92rem;
  }

  .support-title {
    font-size: 1.34rem;
  }

  .panel-copy,
  .free-badge strong,
  .meta-value,
  .feature-label,
  .feature-value {
    white-space: normal;
  }

  .telemetry-meta,
  .panel-footer {
    flex-direction: column;
    align-items: flex-start;
  }

  .feature-item {
    align-items: flex-start;
    flex-direction: column;
  }

  .build-tag {
    text-align: left;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}