: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%;
  scroll-snap-type: y proximity;
}

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;
  overflow-x: hidden;
}

body.modal-open {
  overflow: hidden;
}

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;
}

.landing-screen {
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  display: flex;
  position: relative;
  scroll-snap-align: start;
}

.hero-section {
  --fan-size: 120vmin;
  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: 36px;
  z-index: 10;
  max-width: 340px;
}

.scroll-cue {
  position: absolute;
  left: 36px;
  bottom: 24px;
  z-index: 10;
  display: grid;
  gap: 10px;
  color: var(--text-paper-muted);
}

.scroll-cue-line {
  width: 1px;
  height: 54px;
  background: linear-gradient(180deg, rgba(243, 241, 236, 0.62), transparent);
  animation: cue-drift 2.4s ease-in-out infinite;
}

@keyframes cue-drift {
  0%,
  100% {
    transform: translateY(0);
    opacity: 0.58;
  }
  50% {
    transform: translateY(8px);
    opacity: 1;
  }
}

.hero-branding h1 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 4.6rem;
  letter-spacing: -0.03em;
  line-height: 0.95;
  color: var(--text-paper);
  margin: 0.28rem 0 0.62rem;
}

.hero-tagline {
  color: var(--text-paper-muted);
  font-size: 0.96rem;
  line-height: 1.55;
  max-width: 22ch;
}

.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: 432px;
  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: 40px 36px 32px;
  position: relative;
  z-index: 20;
}

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

.lang-switch {
  margin-top: 14px;
  display: inline-flex;
  gap: 6px;
  align-self: flex-end;
}

.product-intro {
  margin-top: 26px;
  display: flex;
  align-items: center;
  gap: 14px;
  align-items: center;
  padding: 14px 0 18px;
  border-bottom: 1px solid rgba(17, 17, 17, 0.08);
}

.product-icon {
  width: 64px;
  height: 64px;
  display: block;
  border-radius: 18px;
  box-shadow:
    0 8px 22px rgba(0, 0, 0, 0.12),
    inset 0 1px 0 rgba(255, 255, 255, 0.52);
}

.product-name-row {
  display: flex;
  align-items: center;
  min-width: 0;
}

.product-name-row strong {
  font-family: var(--font-display);
  font-size: 2.2rem;
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--text-ink);
  white-space: nowrap;
}

.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: 30px;
  margin-bottom: 30px;
}

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

.support-title {
  margin-top: 10px;
  font-family: var(--font-sans);
  font-size: 1.72rem;
  font-weight: 600;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--text-ink);
  text-wrap: balance;
}

.telemetry-meta {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: 22px;
}

.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: 16px;
}

.panel-copy {
  color: var(--text-ink-muted);
  font-size: 0.92rem;
  line-height: 1.55;
}

.free-badge {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  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: 8px;
}

.feature-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding-bottom: 10px;
  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: 0.93rem;
}

.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: 0.93rem;
  font-weight: 600;
  line-height: 1.35;
  letter-spacing: -0.01em;
  text-align: right;
  white-space: nowrap;
  flex-shrink: 0;
}

.cta-group {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: 14px;
  align-items: start;
}

.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);
}

.cta-button.compact {
  padding-inline: 16px;
  min-width: 0;
  grid-column: 1 / -1;
}

.cta-button:disabled {
  opacity: 0.48;
  cursor: default;
  transform: none;
}

.support-modal[hidden] {
  display: none;
}

.support-modal {
  position: fixed;
  inset: 0;
  z-index: 120;
  display: grid;
  place-items: center;
  padding: 24px;
  opacity: 0;
  transition: opacity 0.24s ease;
}

.support-modal.is-visible {
  opacity: 1;
}

.support-backdrop {
  position: absolute;
  inset: 0;
  border: none;
  background: rgba(0, 0, 0, 0.34);
  backdrop-filter: blur(10px);
  cursor: pointer;
  opacity: 0;
  transition: opacity 0.24s ease;
}

.support-modal.is-visible .support-backdrop {
  opacity: 1;
}

.support-card {
  --support-accent: #07c160;
  position: relative;
  z-index: 1;
  width: min(420px, calc(100vw - 36px));
  min-height: 420px;
  padding: 18px 18px 16px;
  border-radius: 28px;
  background:
    radial-gradient(circle at 50% -10%, rgba(255, 255, 255, 0.72), transparent 38%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.5), transparent 18%),
    linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(243, 241, 236, 0.98));
  border: 1px solid rgba(17, 17, 17, 0.08);
  box-shadow:
    0 30px 90px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.74);
  display: grid;
  grid-template-rows: auto 1fr auto;
  gap: 14px;
  overflow: hidden;
  transform: translateY(16px) scale(0.975);
  opacity: 0;
  transition:
    transform 0.28s cubic-bezier(0.22, 1, 0.36, 1),
    opacity 0.24s ease,
    box-shadow 0.28s ease;
}

.support-card::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle, rgba(17, 17, 17, 0.05) 0 0.8px, transparent 1px 100%);
  background-size: 15px 15px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.24), transparent 44%);
  opacity: 0.18;
}

.support-card::after {
  content: "";
  position: absolute;
  inset: auto 22px 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(17, 17, 17, 0.08), transparent);
}

.support-modal.is-visible .support-card {
  transform: translateY(0) scale(1);
  opacity: 1;
}

.support-modal[data-support-theme="alipay"] .support-card {
  --support-accent: #1677ff;
}

.support-switch {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 6px;
  padding: 5px;
  border-radius: 999px;
  background: rgba(17, 17, 17, 0.06);
}

.support-switch-btn {
  border: none;
  border-radius: 999px;
  background: transparent;
  color: rgba(17, 17, 17, 0.58);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 12px 10px;
  cursor: pointer;
  transition: background-color 0.22s ease, color 0.22s ease, transform 0.22s ease;
}

.support-switch-btn.is-active {
  background: var(--support-accent);
  color: #fff;
}

.support-qr-wrap {
  display: grid;
  place-items: center;
  border-radius: 22px;
  background:
    radial-gradient(circle at 50% 0%, rgba(255, 255, 255, 0.84), transparent 40%),
    linear-gradient(180deg, rgba(255, 255, 255, 0.42), rgba(255, 255, 255, 0.86));
  border: 1px solid rgba(17, 17, 17, 0.08);
  padding: 18px;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.7);
}

.support-qr {
  display: block;
  grid-area: 1 / 1;
  width: min(100%, 320px);
  height: auto;
  background: #fff;
  border-radius: 18px;
  box-shadow: 0 14px 40px rgba(0, 0, 0, 0.1);
  opacity: 0;
  transform: scale(0.985);
  transition: opacity 0.22s ease, transform 0.26s ease;
}

.support-qr.is-active {
  opacity: 1;
  transform: scale(1);
}

.support-meta {
  display: grid;
  justify-items: center;
  gap: 6px;
  text-align: center;
}

.support-name {
  display: block;
  grid-area: 2 / 1;
  color: rgba(17, 17, 17, 0.72);
  font-size: 0.92rem;
  line-height: 1.45;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 0.2s ease, transform 0.24s ease;
}

.support-name.is-active {
  opacity: 1;
  transform: translateY(0);
}

.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: 20px;
  margin-top: 30px;
}

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

.iteration-section {
  min-height: 78vh;
  scroll-snap-align: start;
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(360px, 1fr);
  gap: clamp(28px, 6vw, 88px);
  align-items: center;
  padding: 92px clamp(28px, 7vw, 112px);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 14% 24%, rgba(255, 255, 255, 0.08), transparent 18%),
    radial-gradient(circle at 84% 68%, rgba(255, 255, 255, 0.05), transparent 22%),
    linear-gradient(135deg, #161616 0%, #080808 58%, #000 100%);
}

.iteration-section::before {
  content: "";
  position: absolute;
  inset: 10% -6% auto auto;
  width: min(48vw, 620px);
  aspect-ratio: 1;
  border: 1px solid rgba(243, 241, 236, 0.12);
  border-radius: 50%;
  background:
    repeating-conic-gradient(from 12deg, rgba(243, 241, 236, 0.06) 0 8deg, transparent 8deg 18deg);
  mask-image: radial-gradient(circle, transparent 0 34%, rgba(0, 0, 0, 0.9) 35% 64%, transparent 65%);
  opacity: 0.72;
  animation: rotate 32s linear infinite;
}

.iteration-copy {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 18px;
  max-width: 620px;
}

.iteration-copy h2 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 6vw, 6rem);
  line-height: 0.92;
  letter-spacing: -0.045em;
  color: var(--text-paper);
  text-wrap: balance;
}

.iteration-copy p {
  max-width: 48ch;
  color: var(--text-paper-muted);
  font-size: clamp(1rem, 1.4vw, 1.18rem);
  line-height: 1.75;
}

.iteration-board {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 16px;
}

.iteration-stat {
  min-height: 178px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 24px;
  border-radius: 30px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 22%),
    rgba(245, 243, 238, 0.92);
  color: var(--text-ink);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.64);
}

.iteration-stat-primary {
  grid-row: span 2;
  min-height: 372px;
  background:
    radial-gradient(circle at 24% 12%, rgba(255, 255, 255, 0.9), transparent 28%),
    linear-gradient(145deg, #f7f4ea, #d9d2c0);
}

.iteration-number {
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 8vw, 7.6rem);
  line-height: 0.82;
  letter-spacing: -0.08em;
}

.iteration-stat:not(.iteration-stat-primary) .iteration-number {
  font-size: clamp(2.4rem, 4vw, 4.4rem);
}

.iteration-unit {
  color: rgba(17, 17, 17, 0.58);
  font-size: 0.8rem;
  line-height: 1.45;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-weight: 700;
}

.iteration-note {
  position: absolute;
  left: clamp(28px, 7vw, 112px);
  right: clamp(28px, 7vw, 112px);
  bottom: 34px;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-paper-muted);
  font-size: 0.86rem;
  line-height: 1.55;
}

.iteration-pulse {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--text-paper);
  box-shadow: 0 0 0 0 rgba(243, 241, 236, 0.28);
  animation: iteration-pulse 2.2s ease-out infinite;
  flex: 0 0 auto;
}

@keyframes iteration-pulse {
  0% {
    box-shadow: 0 0 0 0 rgba(243, 241, 236, 0.34);
  }
  70% {
    box-shadow: 0 0 0 18px rgba(243, 241, 236, 0);
  }
  100% {
    box-shadow: 0 0 0 0 rgba(243, 241, 236, 0);
  }
}

.showcase-section {
  min-height: 100vh;
  min-height: 100svh;
  min-height: 100dvh;
  scroll-snap-align: start;
  padding: 72px 40px 88px;
  background:
    radial-gradient(circle at 22% 20%, rgba(255, 255, 255, 0.05), transparent 18%),
    linear-gradient(180deg, #0f0f0f 0%, #090909 100%);
}

.showcase-header {
  display: grid;
  gap: 12px;
  max-width: 760px;
  margin: 0 auto 42px;
  text-align: center;
}

.showcase-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  color: var(--text-paper);
}

.showcase-grid {
  display: grid;
  grid-template-columns: minmax(220px, 0.8fr) minmax(320px, 0.96fr) minmax(220px, 0.8fr);
  gap: 24px;
  align-items: start;
  max-width: 1480px;
  margin: 0 auto;
}

.showcase-rail,
.showcase-stage {
  display: grid;
  gap: 22px;
}

.showcase-stage {
  position: sticky;
  top: 28px;
}

.showcase-rail-left {
  padding-top: 18px;
}

.showcase-rail-right {
  padding-top: 84px;
}

.showcase-card {
  display: grid;
  gap: 14px;
  padding: 18px;
  border-radius: 28px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 18%),
    rgba(245, 243, 238, 0.92);
  color: var(--text-ink);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow:
    0 26px 60px rgba(0, 0, 0, 0.22),
    inset 0 1px 0 rgba(255, 255, 255, 0.5);
  backdrop-filter: blur(8px);
}

.showcase-card img {
  width: 100%;
  display: block;
  border-radius: 20px;
  box-shadow: 0 14px 34px rgba(0, 0, 0, 0.12);
}

.showcase-card figcaption {
  color: rgba(17, 17, 17, 0.72);
  font-size: 0.88rem;
  line-height: 1.45;
}

.showcase-card-primary {
  padding: 22px;
}

.showcase-card-small,
.showcase-card-small-alt {
  max-width: 360px;
}

.showcase-card-wide {
  transform: translateX(24px);
}

.showcase-card-medium {
  transform: translateX(-10px);
}

.showcase-card-small-alt {
  transform: translateX(-18px);
}

html[lang="en"] .support-title {
  font-size: 1.48rem;
}

html[lang="en"] .panel-copy,
html[lang="en"] .meta-value,
html[lang="en"] .feature-label,
html[lang="en"] .feature-value,
html[lang="en"] .free-badge strong {
  white-space: normal;
  overflow-wrap: anywhere;
  word-break: normal;
}

html[lang="en"] .panel-copy,
html[lang="en"] .meta-value,
html[lang="en"] .feature-value,
html[lang="en"] .free-badge strong {
  font-size: 0.9rem;
  letter-spacing: 0;
}

html[lang="en"] .feature-label {
  font-size: 0.88rem;
}

html[lang="en"] .panel-copy {
  line-height: 1.45;
}

html[lang="en"] .cta-button {
  letter-spacing: 0.08em;
  padding: 13px 16px;
}

@media (min-width: 1180px) and (max-width: 1366px) {
  .hero-section {
    --fan-size: 130vmin;
  }

  .control-panel {
    width: clamp(340px, 29vw, 400px);
    padding: 34px 22px 28px;
  }

  .hero-branding {
    left: 26px;
    bottom: 30px;
    max-width: 292px;
  }

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

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

  .product-icon {
    width: 56px;
    height: 56px;
  }

  .product-name-row strong {
    font-size: 1.72rem;
  }

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

  .showcase-section {
    padding-inline: 28px;
  }

  .iteration-section {
    padding-inline: 48px;
    gap: 38px;
  }

  .showcase-grid {
    grid-template-columns: minmax(180px, 0.78fr) minmax(300px, 0.94fr) minmax(180px, 0.78fr);
    gap: 18px;
  }
}

@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: 146vmin;
  }

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

  .control-panel {
    width: 438px;
  }

  .showcase-grid {
    max-width: 1560px;
  }
}

@media (min-width: 1680px) and (min-aspect-ratio: 16/10) {
  .hero-section {
    --fan-size: 160vmin;
  }

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

  .control-panel {
    width: 424px;
  }
}

@media (min-width: 1280px) and (max-height: 780px) {
  .hero-section {
    --fan-size: 140vmin;
  }

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

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

@media (min-width: 820px) and (max-width: 1179px) {
  .landing-screen {
    min-height: auto;
  }

  .hero-section {
    --fan-size: 136vmin;
  }

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

  .hero-branding {
    left: 28px;
    bottom: 30px;
    max-width: 300px;
  }

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

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

  .product-icon {
    width: 54px;
    height: 54px;
  }

  .product-name-row strong {
    font-size: 1.66rem;
  }

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

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

  .showcase-section {
    min-height: auto;
    padding: 56px 24px 72px;
  }

  .iteration-section {
    min-height: auto;
    grid-template-columns: 1fr;
    padding: 64px 28px 86px;
  }

  .iteration-board {
    grid-template-columns: 1fr 1fr;
  }

  .iteration-stat-primary {
    grid-row: auto;
    grid-column: 1 / -1;
    min-height: 220px;
  }

  .iteration-note {
    left: 28px;
    right: 28px;
    bottom: 24px;
  }

  .showcase-header {
    margin-bottom: 28px;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 18px;
    max-width: 760px;
  }

  .showcase-stage {
    position: static;
  }

  .showcase-rail-left,
  .showcase-rail-right {
    padding-top: 0;
  }

  .showcase-card-small,
  .showcase-card-small-alt,
  .showcase-card-wide,
  .showcase-card-medium {
    max-width: none;
    transform: none;
  }
}

@media (orientation: landscape) and (min-width: 1024px) and (max-width: 1366px) and (hover: none) and (pointer: coarse) {
  .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(360px, 33vw, 460px);
    padding: 26px 20px 18px;
    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;
  }

  .product-intro {
    margin-top: 14px;
    gap: 12px;
    padding: 10px 0 12px;
  }

  .product-icon {
    width: 46px;
    height: 46px;
    border-radius: 14px;
  }

  .product-name-row strong {
    font-size: 1.36rem;
  }

  .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;
  }

  .scroll-cue {
    left: 20px;
    bottom: 18px;
  }

  html[lang="en"] .panel-copy,
  html[lang="en"] .free-badge strong,
  html[lang="en"] .meta-value,
  html[lang="en"] .feature-label,
  html[lang="en"] .feature-value {
    white-space: normal;
    overflow-wrap: anywhere;
    word-break: normal;
  }

  html[lang="en"] .support-title {
    font-size: 1.12rem;
    line-height: 1.25;
  }

  html[lang="en"] .panel-copy {
    font-size: 0.82rem;
    line-height: 1.35;
  }

  html[lang="en"] .feature-item {
    align-items: flex-start;
    flex-direction: column;
    gap: 6px;
  }

  html[lang="en"] .feature-value {
    text-align: left;
  }

  html[lang="en"] .cta-group {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  html[lang="en"] .cta-button {
    width: 100%;
    letter-spacing: 0.05em;
    padding: 10px 10px;
  }
}

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

@media (max-width: 819px) {
  html {
    scroll-snap-type: none;
  }

  body {
    overflow: auto;
  }

  .landing-screen {
    min-height: auto;
    display: block;
  }

  .hero-section {
    --fan-size: 150vmin;
    min-height: 60vh;
  }

  .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;
  }

  .product-intro {
    margin-top: 18px;
  }

  .product-icon {
    width: 58px;
    height: 58px;
  }

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

  .scroll-cue {
    left: 24px;
    bottom: 18px;
  }

  .showcase-section {
    min-height: auto;
    padding: 44px 16px 60px;
  }

  .iteration-section {
    min-height: auto;
    grid-template-columns: 1fr;
    padding: 52px 16px 82px;
  }

  .iteration-section::before {
    width: 92vw;
    inset: 6% -28% auto auto;
  }

  .iteration-board {
    grid-template-columns: 1fr;
  }

  .iteration-stat,
  .iteration-stat-primary {
    min-height: 156px;
  }

  .iteration-stat-primary {
    grid-row: auto;
  }

  .iteration-note {
    left: 16px;
    right: 16px;
    bottom: 22px;
    align-items: flex-start;
  }

  .showcase-header {
    text-align: left;
    margin-bottom: 24px;
  }

  .showcase-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .showcase-stage {
    position: static;
  }

  .showcase-rail-left,
  .showcase-rail-right {
    padding-top: 0;
  }

  .showcase-card,
  .showcase-card-primary,
  .showcase-card-small,
  .showcase-card-small-alt,
  .showcase-card-wide,
  .showcase-card-medium {
    max-width: none;
    transform: none;
  }
}

@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;
  }

  .product-name-row strong {
    font-size: 1.5rem;
  }

  .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;
  }

  .cta-group {
    grid-template-columns: 1fr;
  }

  .support-card {
    width: min(92vw, 400px);
    min-height: 0;
    padding: 16px;
    border-radius: 24px;
  }

  .support-switch-btn {
    font-size: 0.74rem;
    padding: 11px 8px;
    letter-spacing: 0.1em;
  }

  .support-qr-wrap {
    padding: 14px;
  }
}

/* ── Timeline Section ── */

.timeline-section {
  scroll-snap-align: start;
  padding: 92px clamp(28px, 7vw, 112px) 80px;
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 14% 24%, rgba(255, 255, 255, 0.08), transparent 18%),
    radial-gradient(circle at 84% 68%, rgba(255, 255, 255, 0.05), transparent 22%),
    linear-gradient(135deg, #161616 0%, #080808 58%, #000 100%);
}

.timeline-header {
  max-width: 760px;
  margin: 0 auto 48px;
  text-align: center;
}

.timeline-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  color: var(--text-paper);
  margin-top: 12px;
}

.timeline-track {
  max-width: 760px;
  margin: 0 auto;
  position: relative;
  transition: max-height 0.5s cubic-bezier(0.22, 1, 0.36, 1);
}

.timeline-track.is-expanded {
  max-height: 65vh;
  overflow-y: auto;
  scrollbar-width: thin;
  scrollbar-color: rgba(243, 241, 236, 0.2) transparent;
}

.timeline-track.is-expanded::-webkit-scrollbar {
  width: 4px;
}

.timeline-track.is-expanded::-webkit-scrollbar-track {
  background: transparent;
}

.timeline-track.is-expanded::-webkit-scrollbar-thumb {
  background: rgba(243, 241, 236, 0.2);
  border-radius: 2px;
}

.timeline-track::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 19px;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(243, 241, 236, 0.18) 4%,
    rgba(243, 241, 236, 0.18) 96%,
    transparent 100%
  );
  z-index: 0;
}

.timeline-date-group {
  margin-bottom: 32px;
}

.timeline-date-group:last-child {
  margin-bottom: 0;
}

.timeline-date-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 20px;
  padding-left: 48px;
  position: relative;
}

.timeline-date-dot {
  position: absolute;
  left: 12px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--text-paper);
  box-shadow: 0 0 0 4px rgba(243, 241, 236, 0.12);
  z-index: 1;
}

.timeline-date-text {
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  color: var(--text-paper);
}

.timeline-entry {
  position: relative;
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 0 14px;
  padding-bottom: 18px;
  align-items: start;
}

.timeline-entry:last-child {
  padding-bottom: 0;
}

.timeline-entry-dot {
  justify-self: center;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(243, 241, 236, 0.4);
  margin-top: 7px;
  z-index: 1;
}

.timeline-entry-content {
  display: grid;
  gap: 6px;
}

.timeline-entry-time {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-paper-muted);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.timeline-entry-body {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px;
}

.timeline-entry-version {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(243, 241, 236, 0.1);
  border: 1px solid rgba(243, 241, 236, 0.16);
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-paper);
  white-space: nowrap;
  flex-shrink: 0;
}

.timeline-entry-desc {
  font-family: var(--font-sans);
  font-size: 0.88rem;
  line-height: 1.55;
  color: var(--text-paper-muted);
}

.timeline-expand-wrap {
  max-width: 760px;
  margin: 28px auto 0;
  text-align: center;
}

.timeline-expand-btn {
  border: 1px solid rgba(243, 241, 236, 0.2);
  background: rgba(243, 241, 236, 0.04);
  color: var(--text-paper-muted);
  font-family: var(--font-sans);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border-radius: 999px;
  padding: 12px 28px;
  cursor: pointer;
  transition: all 0.22s ease;
}

.timeline-expand-btn:hover {
  background: rgba(243, 241, 236, 0.1);
  color: var(--text-paper);
  border-color: rgba(243, 241, 236, 0.32);
  transform: translateY(-1px);
}

@media (max-width: 819px) {
  .timeline-section {
    padding: 52px 16px 60px;
  }

  .timeline-header {
    text-align: left;
    margin-bottom: 32px;
  }

  .timeline-header h2 {
    font-size: clamp(1.8rem, 6vw, 2.8rem);
  }

  .timeline-track::before {
    left: 11px;
  }

  .timeline-date-header {
    padding-left: 36px;
  }

  .timeline-date-dot {
    left: 4px;
    width: 14px;
    height: 14px;
  }

  .timeline-entry {
    grid-template-columns: 28px 1fr;
    gap: 0 10px;
  }

  .timeline-entry-dot {
    width: 6px;
    height: 6px;
  }

  .timeline-entry-desc {
    font-size: 0.84rem;
  }

  .timeline-track.is-expanded {
    max-height: 55vh;
  }
}

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

/* ── Voices Section ── */

.voices-section {
  scroll-snap-align: start;
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(360px, 1fr);
  grid-template-rows: auto 1fr;
  gap: clamp(28px, 6vw, 88px);
  align-items: stretch;
  padding: 92px clamp(28px, 7vw, 112px);
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 74% 18%, rgba(255, 255, 255, 0.07), transparent 20%),
    radial-gradient(circle at 22% 72%, rgba(255, 255, 255, 0.04), transparent 24%),
    linear-gradient(135deg, #131313 0%, #080808 58%, #000 100%);
}

.voices-header {
  grid-column: 1 / -1;
  text-align: center;
  max-width: 760px;
  margin: 0 auto;
  z-index: 1;
}

.voices-header h2 {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 4vw, 3.8rem);
  line-height: 0.96;
  letter-spacing: -0.035em;
  color: var(--text-paper);
  margin-top: 12px;
}

.voices-header p {
  max-width: 48ch;
  margin: 14px auto 0;
  color: var(--text-paper-muted);
  font-size: clamp(0.92rem, 1.2vw, 1.06rem);
  line-height: 1.75;
}

.voices-stats {
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  height: 100%;
}

.voices-stat-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  flex: 1;
  padding: 24px;
  border-radius: 30px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.08), transparent 22%),
    rgba(245, 243, 238, 0.92);
  color: var(--text-ink);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow:
    0 28px 70px rgba(0, 0, 0, 0.24),
    inset 0 1px 0 rgba(255, 255, 255, 0.64);
}

.voices-stat-number {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 4vw, 4rem);
  line-height: 0.86;
  letter-spacing: -0.06em;
}

.voices-stat-label {
  color: rgba(17, 17, 17, 0.58);
  font-size: 0.78rem;
  line-height: 1.45;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
}

/* ── Carousel ── */

.voices-carousel {
  position: relative;
  z-index: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  border-radius: 24px;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 10%),
    rgba(24, 24, 24, 0.9);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
}

.voices-card-track {
  display: flex;
  flex: 1;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
  will-change: transform;
}

.voices-feedback-card {
  flex: 0 0 100%;
  width: 100%;
  display: flex;
  flex-direction: column;
}

/* ── Card Sections ── */

.voices-card-section {
  padding: 26px 30px 22px;
  flex: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.voices-card-label {
  color: var(--text-paper-muted);
  margin-bottom: 10px;
}

/* top: user feedback */
.voices-card-quote {
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.06), transparent 20%),
    rgba(255, 255, 255, 0.02);
  border-bottom: 1px solid rgba(243, 241, 236, 0.08);
}

.voices-card-quote p {
  font-family: var(--font-display);
  font-size: clamp(1.06rem, 1.4vw, 1.28rem);
  line-height: 1.55;
  color: var(--text-paper);
  letter-spacing: -0.01em;
}

/* bottom: what we built */
.voices-card-built {
  background: rgba(0, 0, 0, 0.18);
  border-bottom: 1px solid rgba(243, 241, 236, 0.06);
}

.voices-card-built p {
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--text-paper-muted);
}

/* ── Meta Footer ── */

.voices-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 30px 14px;
  background: rgba(0, 0, 0, 0.28);
}

.voices-card-date {
  font-family: var(--font-sans);
  font-size: 0.72rem;
  color: var(--text-paper-muted);
  letter-spacing: 0.04em;
  font-variant-numeric: tabular-nums;
}

.voices-card-arrow {
  color: rgba(243, 241, 236, 0.24);
  font-size: 0.68rem;
  line-height: 1;
}

.voices-card-version {
  margin-left: auto;
  display: inline-block;
  padding: 3px 10px;
  border-radius: 999px;
  background: rgba(243, 241, 236, 0.1);
  border: 1px solid rgba(243, 241, 236, 0.16);
  font-family: var(--font-sans);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--text-paper);
  white-space: nowrap;
}

/* ── Carousel Navigation ── */

.voices-carousel-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px 24px;
}

.voices-carousel-dots {
  display: flex;
  gap: 8px;
}

.voices-carousel-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: rgba(243, 241, 236, 0.22);
  border: none;
  cursor: pointer;
  padding: 0;
  transition: all 0.28s ease;
}

.voices-carousel-dot.is-active {
  background: var(--text-paper);
  box-shadow: 0 0 0 3px rgba(243, 241, 236, 0.14);
}

/* ── Voices responsive ── */

@media (max-width: 1179px) {
  .voices-section {
    gap: clamp(22px, 4vw, 48px);
    padding: 72px clamp(28px, 6vw, 64px);
  }

  .voices-stat-card {
    padding: 18px 20px;
  }
}

@media (max-width: 819px) {
  .voices-section {
    min-height: auto;
    grid-template-columns: 1fr;
    grid-template-rows: auto;
    padding: 52px 16px 60px;
    gap: 32px;
  }

  .voices-header {
    text-align: left;
    margin: 0;
  }

  .voices-header p {
    margin-left: 0;
    margin-right: 0;
  }

  .voices-stats {
    grid-template-columns: repeat(3, 1fr);
    height: auto;
    gap: 10px;
  }

  .voices-stat-card {
    padding: 16px;
  }

  .voices-stat-number {
    font-size: clamp(1.6rem, 5vw, 2.6rem);
  }

  .voices-carousel {
    height: 360px;
  }

  .voices-card-section {
    padding: 20px 20px 16px;
  }

  .voices-card-meta {
    padding: 10px 20px 12px;
  }

  .voices-carousel-nav {
    padding: 12px 20px 16px;
  }
}

@media (max-width: 640px) {
  .voices-stats {
    grid-template-columns: 1fr 1fr;
  }

  .voices-stat-card:first-child {
    grid-column: 1 / -1;
  }

  .voices-stat-card {
    padding: 16px 18px;
    border-radius: 20px;
  }

  .voices-carousel {
    height: 340px;
  }

  .voices-card-section {
    padding: 18px 16px 14px;
  }

  .voices-card-meta {
    padding: 10px 16px 12px;
  }

  .voices-card-quote p {
    font-size: 1rem;
  }

  .voices-card-built p {
    font-size: 0.84rem;
  }
}