/* ==========================================================================
   OddLab marketing page — design tokens derived from the approved logo.
   Logo colors: charcoal #282828, periwinkle #7181FD → violet #A084F1,
   lavender-white #DEE0FE.
   ========================================================================== */

:root {
  color-scheme: dark;

  --color-bg: #282828;
  --color-bg-deep: #1e1e22;
  --color-surface: #2f2f34;
  --color-surface-elevated: #37373d;
  --color-brand-primary: #7181fd;
  --color-brand-accent: #a084f1;
  --color-brand-soft: #c5b8ff;
  --color-text-primary: #dee0fe;
  --color-text-secondary: #a9abc4;
  --color-text-tertiary: #7c7e97;
  --color-border: rgba(222, 224, 254, 0.12);
  --color-border-strong: rgba(222, 224, 254, 0.24);
  --color-focus: #7181fd;
  --color-on-brand: #0f0f14;

  /* iOS: .system(design: .rounded, weight: .bold) = SF Pro Rounded Bold; CJK glyphs fall back to PingFang SC.
     Web: `ui-rounded` maps to SF Pro Rounded on Apple platforms; Nunito is the open-source fallback elsewhere. */
  --font-display: ui-rounded, "SF Pro Rounded", "Nunito", -apple-system, "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", sans-serif;
  --font-display-weight: 700;
  --font-body: -apple-system, BlinkMacSystemFont, "Inter", "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Segoe UI", sans-serif;
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, Menlo, monospace;

  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4.5rem;
  --space-9: 7rem;
  --section-gap: clamp(5rem, 12vw, 10rem);

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-pill: 999px;

  --shadow-soft: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 20px 50px rgba(0, 0, 0, 0.35);
  --shadow-phone: 0 40px 90px rgba(0, 0, 0, 0.55), 0 0 0 1px rgba(222, 224, 254, 0.08);
  --glow-brand: 0 0 80px rgba(113, 129, 253, 0.28);

  --content-max-width: 1180px;
  --gutter: clamp(1rem, 4vw, 2.5rem);
  --header-height: 68px;

  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
  --dur: 700ms;
}

/* ----------------------------------------------------------------- reset */
*,
*::before,
*::after {
  box-sizing: border-box;
}

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

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img,
video,
svg {
  display: block;
  max-width: 100%;
}

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

p {
  margin: 0;
}

h1,
h2,
h3 {
  margin: 0;
  font-weight: 400;
}

button {
  font: inherit;
  color: inherit;
}

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

[hidden] {
  display: none !important;
}

.visually-hidden {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: -100px;
  left: var(--gutter);
  z-index: 100;
  padding: var(--space-2) var(--space-4);
  background: var(--color-brand-primary);
  color: var(--color-on-brand);
  border-radius: var(--radius-sm);
}
.skip-link:focus {
  top: var(--space-3);
}

.container {
  width: 100%;
  max-width: var(--content-max-width);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

/* ------------------------------------------------------------ typography */
.display-xl,
.display-lg,
.display-md {
  font-family: var(--font-display);
  font-weight: var(--font-display-weight);
  letter-spacing: -0.01em;
  line-height: 1.12;
  text-wrap: balance;
}
.display-xl {
  font-size: clamp(2.5rem, 5.6vw, 4.4rem);
}
.display-lg {
  font-size: clamp(2rem, 4.6vw, 3.6rem);
}
.display-md {
  font-size: clamp(1.75rem, 3.6vw, 2.75rem);
}

.lead {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.25rem, 2vw, 1.6rem);
  color: var(--color-brand-soft);
  margin-top: var(--space-5);
}

.brand-lockup-hero {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  margin-bottom: var(--space-6);
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.01em;
}
.brand-lockup-hero .lockup-name {
  font-size: 43px;
}
.brand-lockup-hero .lockup-local {
  font-size: 31px;
  color: var(--color-brand-soft);
}
.brand-lockup-hero .lockup-en {
  margin-top: var(--space-2);
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}

.eyebrow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}
.eyebrow-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-brand-primary);
  box-shadow: 0 0 0 4px rgba(113, 129, 253, 0.18);
}
.eyebrow-alt {
  color: var(--color-text-tertiary);
}
.eyebrow-alt::before {
  content: "/";
  margin-right: var(--space-3);
  color: var(--color-border-strong);
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-6);
}
.section-label.centered {
  justify-content: center;
}
.label-index {
  padding: 2px 8px;
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  color: var(--color-brand-soft);
}

.section-intro {
  color: var(--color-text-secondary);
  font-size: 1.1rem;
  max-width: 34ch;
}

.en-term {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-brand-soft);
  margin-bottom: var(--space-1);
}
.en-term-lg {
  display: block;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-brand-soft);
  margin-bottom: 0.1em;
}

/* --------------------------------------------------------------- buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  min-height: 48px;
  padding: 0 var(--space-5);
  border-radius: var(--radius-pill);
  border: 1px solid transparent;
  font-weight: 500;
  white-space: nowrap;
  transition: transform 200ms var(--ease-out), background-color 200ms, border-color 200ms, box-shadow 200ms;
}
.btn:hover {
  transform: translateY(-1px);
}
.btn-small {
  min-height: 40px;
  padding: 0 var(--space-4);
  font-size: 0.9rem;
}
.btn-primary {
  background: var(--color-brand-primary);
  color: var(--color-on-brand);
}
.btn-primary:hover {
  background: #8290ff;
  box-shadow: 0 8px 24px rgba(113, 129, 253, 0.35);
}
.web-start-link {
  background: linear-gradient(100deg, var(--color-brand-primary), #73d9e4);
}
.web-start-link:hover {
  background: linear-gradient(100deg, #8290ff, #8be4ec);
}

.btn-appstore {
  min-height: 60px;
  padding: 0 var(--space-6) 0 var(--space-5);
  background: var(--color-text-primary);
  color: var(--color-on-brand);
  border-color: var(--color-text-primary);
}
.btn-appstore:hover {
  background: #fff;
  box-shadow: 0 12px 32px rgba(222, 224, 254, 0.2);
}
.apple-glyph {
  width: 26px;
  height: 26px;
  fill: currentColor;
  flex: 0 0 auto;
}
.btn-appstore-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
  text-align: left;
}
.btn-appstore-text small {
  font-size: 0.72rem;
  font-weight: 500;
  opacity: 0.75;
}
.btn-appstore-text strong {
  font-size: 1.05rem;
  font-weight: 600;
}

.cta-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-top: var(--space-7);
}
.cta-row.centered {
  justify-content: center;
}

.qr-block {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.qr-frame {
  padding: 10px;
  background: #fff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-soft);
}
.qr-frame img {
  width: 92px;
  height: 92px;
}
.qr-caption {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--color-text-secondary);
  max-width: 14ch;
}

/* ---------------------------------------------------------------- header */
.site-header {
  position: sticky;
  top: env(safe-area-inset-top, 0px);
  z-index: 50;
  height: var(--header-height);
  background: rgba(40, 40, 40, 0.72);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  backdrop-filter: saturate(140%) blur(14px);
  border-bottom: 1px solid var(--color-border);
}
.header-inner {
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}
.brand-lockup {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex: 0 1 auto;
  min-width: 0;
}
.brand-mark {
  width: 36px;
  height: 36px;
  min-width: 36px;
  border-radius: 10px;
  object-fit: cover;
  flex: 0 0 auto;
}
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
}
.brand-sub {
  font-size: 0.8rem;
  color: var(--color-text-secondary);
  padding-left: var(--space-3);
  border-left: 1px solid var(--color-border-strong);
  white-space: nowrap;
}
.site-nav {
  display: flex;
  gap: var(--space-5);
  font-size: 0.92rem;
  color: var(--color-text-secondary);
}
.site-nav a {
  white-space: nowrap;
  padding: var(--space-2) 0;
  border-bottom: 1px solid transparent;
  transition: color 150ms, border-color 150ms;
}
.site-nav a:hover {
  color: var(--color-text-primary);
  border-color: var(--color-brand-primary);
}
.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}
.lang-select {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  min-height: 40px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: border-color 150ms, color 150ms;
}
.lang-select:hover,
.lang-select:focus-within {
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}
.lang-select-icon {
  width: 18px;
  height: 18px;
  fill: currentColor;
  flex: 0 0 auto;
}
.lang-select-chevron {
  width: 14px;
  height: 14px;
  flex: 0 0 auto;
  pointer-events: none;
}
.lang-select-input {
  -webkit-appearance: none;
  appearance: none;
  background: transparent;
  border: 0;
  padding: 0;
  margin: 0;
  color: inherit;
  font: inherit;
  font-size: 0.9rem;
  cursor: pointer;
  max-width: 9.5rem;
}
.lang-select-input:focus-visible {
  outline: none;
}
.lang-select:focus-within {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}
.lang-select-input option {
  background: var(--color-surface);
  color: var(--color-text-primary);
}

/* ------------------------------------------------------------------ hero */
.hero {
  position: relative;
  padding-block: clamp(3.5rem, 9vw, 7.5rem) clamp(4rem, 8vw, 6rem);
  overflow: hidden;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(60% 50% at 78% 30%, rgba(113, 129, 253, 0.16), transparent 70%),
    radial-gradient(40% 40% at 90% 80%, rgba(160, 132, 241, 0.12), transparent 70%);
  pointer-events: none;
}
.hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  align-items: center;
  gap: clamp(2rem, 6vw, 5rem);
}
.hero-positioning {
  margin-top: var(--space-5);
  max-width: 44ch;
  color: var(--color-text-secondary);
  font-size: 1.05rem;
}

.hero-visual {
  position: relative;
  min-height: 520px;
}
.specimen {
  position: relative;
  margin: 0;
  display: grid;
  place-items: center;
}
.phone-frame {
  position: relative;
  width: min(300px, 78vw);
  aspect-ratio: 9 / 19.2;
  border-radius: 44px;
  padding: 10px;
  background: linear-gradient(160deg, #3b3b42, #1a1a1e);
  box-shadow: var(--shadow-phone), var(--glow-brand);
  will-change: transform;
}
.phone-notch {
  position: absolute;
  top: 18px;
  left: 50%;
  transform: translateX(-50%);
  width: 96px;
  height: 26px;
  border-radius: 20px;
  background: #0f0f12;
  z-index: 2;
}
.phone-screen {
  position: relative;
  height: 100%;
  border-radius: 36px;
  overflow: hidden;
  background: radial-gradient(120% 70% at 50% 0%, #2b2b33 0%, #1c1c21 60%, #16161a 100%);
  display: flex;
  flex-direction: column;
}
.phone-topbar {
  display: flex;
  justify-content: space-between;
  padding: 58px 22px 0;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  color: var(--color-text-tertiary);
}
.phone-topbar-name {
  color: var(--color-text-secondary);
}
.bodygraph {
  width: 100%;
  height: auto;
  margin-top: 6px;
  padding-inline: 4px;
  filter: drop-shadow(0 0 18px rgba(113, 129, 253, 0.25));
}
.phone-readout {
  margin-top: auto;
  display: flex;
  justify-content: space-between;
  padding: 0 22px 26px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--color-brand-soft);
}

.annotations {
  list-style: none;
  margin: 0;
  padding: 0;
  position: absolute;
  inset: 0;
  pointer-events: none;
}
.annotation {
  position: absolute;
  display: inline-flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 12px;
  background: rgba(40, 40, 40, 0.86);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
  color: var(--color-text-primary);
  box-shadow: var(--shadow-soft);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  will-change: transform;
}
.annotation::before {
  content: "";
  position: absolute;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-brand-primary);
  box-shadow: 0 0 0 3px rgba(113, 129, 253, 0.25);
}
.annotation-code {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.12em;
  color: var(--color-text-tertiary);
}
.a-1 { top: 6%; left: 2%; }
.a-1::before { right: -3px; bottom: -3px; }
.a-2 { top: 30%; right: 0; }
.a-2::before { left: -3px; top: 50%; }
.a-3 { top: 56%; left: 0; }
.a-3::before { right: -3px; top: 50%; }
.a-4 { bottom: 12%; right: 2%; }
.a-4::before { left: -3px; top: -3px; }
.a-5 { bottom: 2%; left: 8%; flex-direction: row; align-items: center; gap: 8px; font-family: var(--font-mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--color-text-secondary); }
.a-5::before { display: none; }
.live-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--color-brand-accent);
  animation: pulse 2s ease-in-out infinite;
}

.hero-scrollhint {
  position: absolute;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}
.scroll-line {
  width: 1px;
  height: 28px;
  background: linear-gradient(var(--color-brand-primary), transparent);
}

/* -------------------------------------------------------------- sections */
.section {
  padding-block: var(--section-gap);
  border-top: 1px solid var(--color-border);
}

/* manifesto */
.manifesto-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr) 220px;
  gap: var(--space-7) clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.manifesto-grid .display-lg {
  grid-column: 1 / -1;
  max-width: 22ch;
}
.manifesto-body {
  grid-column: 2;
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  font-size: 1.08rem;
  color: var(--color-text-secondary);
}
.manifesto-notes {
  grid-column: 3;
}
.callout {
  margin-top: var(--space-3);
  padding-left: var(--space-5);
  border-left: 2px solid var(--color-brand-primary);
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.25rem;
  color: var(--color-text-primary);
}
.manifesto-notes {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  padding: var(--space-5);
  border: 1px dashed var(--color-border-strong);
  border-radius: var(--radius-md);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--color-text-secondary);
}
.manifesto-notes p {
  display: flex;
  gap: var(--space-3);
}
.note-key {
  flex: 0 0 auto;
  width: 22px;
  height: 22px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  border: 1px solid var(--color-brand-primary);
  color: var(--color-brand-soft);
  font-size: 0.66rem;
}

/* journey */
.journey-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-6);
  align-items: end;
  margin-bottom: var(--space-8);
}
.journey-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-5);
  position: relative;
  counter-reset: step;
}
.journey-steps::before {
  content: "";
  position: absolute;
  top: 26px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-border-strong) 8%, var(--color-border-strong) 92%, transparent);
}
.journey-step {
  position: relative;
  padding-top: var(--space-8);
}
.journey-step::before {
  content: "";
  position: absolute;
  top: 20px;
  left: 0;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--color-bg);
  border: 1px solid var(--color-border-strong);
  transition: background-color 400ms, border-color 400ms, box-shadow 400ms;
}
.journey-step.is-inview::before {
  background: var(--color-brand-primary);
  border-color: var(--color-brand-primary);
  box-shadow: 0 0 0 5px rgba(113, 129, 253, 0.18);
}
.journey-step-key::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--color-brand-primary);
  opacity: 0.6;
}
.step-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
}
.journey-step h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  line-height: 1.2;
  margin-bottom: var(--space-3);
}
.journey-step p {
  color: var(--color-text-secondary);
  font-size: 0.95rem;
}

/* showcase */
.showcase-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(2rem, 6vw, 6rem);
  align-items: center;
}
.showcase-grid-flip {
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
}
.showcase-copy {
  max-width: 48ch;
}
.showcase-copy > p {
  margin-top: var(--space-5);
  font-size: 1.08rem;
  color: var(--color-text-secondary);
}
.showcase-deep .showcase-copy {
  justify-self: end;
}
.spec-list {
  margin: var(--space-6) 0 0;
  display: grid;
  gap: var(--space-3);
  font-size: 0.92rem;
}
.spec-list div {
  display: grid;
  grid-template-columns: 5.5rem 1fr;
  gap: var(--space-4);
  padding-block: var(--space-3);
  border-top: 1px solid var(--color-border);
}
.spec-list dt {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  padding-top: 3px;
}
.spec-list dd {
  margin: 0;
}

.product-video {
  position: relative;
  width: min(360px, 100%);
  margin-inline: auto;
  aspect-ratio: 9 / 16;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--color-bg-deep);
  box-shadow: var(--shadow-phone);
}
.showcase-initial .product-video {
  transform: rotate(-1.2deg);
}
.showcase-deep .product-video {
  transform: rotate(1deg);
}
.product-video video {
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: var(--color-bg-deep);
}
.play-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: var(--space-3);
  background: linear-gradient(180deg, rgba(30, 30, 34, 0.15), rgba(30, 30, 34, 0.55));
  border: 0;
  cursor: pointer;
  transition: opacity 400ms var(--ease-out);
}
.play-overlay:hover .play-ring {
  transform: scale(1.06);
  background: rgba(222, 224, 254, 1);
}
.play-ring {
  width: 72px;
  height: 72px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: rgba(222, 224, 254, 0.92);
  color: var(--color-on-brand);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.4);
  transition: transform 250ms var(--ease-out), background-color 250ms;
}
.play-ring svg {
  width: 30px;
  height: 30px;
  fill: currentColor;
  margin-left: 3px;
}
.play-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-text-primary);
}
.product-video.is-playing .play-overlay {
  opacity: 0;
  pointer-events: none;
}
.media-tag {
  position: absolute;
  top: 14px;
  left: 14px;
  padding: 4px 8px;
  border-radius: var(--radius-sm);
  background: rgba(40, 40, 40, 0.75);
  border: 1px solid var(--color-border-strong);
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.12em;
  color: var(--color-text-secondary);
  pointer-events: none;
}

/* brand break */
.brand-break {
  position: relative;
  text-align: center;
  background: var(--color-bg-deep);
  overflow: hidden;
}
.brand-break::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(50% 60% at 50% 50%, rgba(113, 129, 253, 0.14), transparent 70%);
  pointer-events: none;
}
.brand-break .container {
  position: relative;
}
.brand-break-title {
  font-family: var(--font-display);
  font-weight: var(--font-display-weight);
  font-size: clamp(2rem, 5.6vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.015em;
  text-wrap: balance;
}
.brand-break-zh {
  margin-top: var(--space-5);
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  color: var(--color-brand-soft);
}
.brand-break-support {
  margin: var(--space-7) auto 0;
  max-width: 40ch;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
}

/* languages */
.languages-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  gap: clamp(2rem, 6vw, 5rem);
  align-items: start;
}
.languages-copy > p {
  margin-top: var(--space-5);
  color: var(--color-text-secondary);
  font-size: 1.08rem;
  max-width: 40ch;
}
.sample-line {
  margin-top: var(--space-7);
  padding: var(--space-5);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  position: relative;
}
.sample-label {
  position: absolute;
  top: -10px;
  left: var(--space-4);
  padding: 0 8px;
  background: var(--color-bg);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
}
.sample-text {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 2.4vw, 1.75rem);
  line-height: 1.3;
  min-height: 2.6em;
  transition: opacity 300ms;
}
.sample-text.is-swapping {
  opacity: 0;
}
.sample-lang {
  display: block;
  margin-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--color-brand-soft);
}
.language-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-3);
}
.lang-chip {
  width: 100%;
  min-height: 64px;
  padding: var(--space-4) var(--space-5);
  text-align: left;
  background: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  cursor: pointer;
  transition: border-color 200ms, background-color 200ms, color 200ms;
}
.lang-chip:hover {
  border-color: var(--color-border-strong);
  background: var(--color-surface);
}
.lang-chip.is-active {
  border-color: var(--color-brand-primary);
  background: rgba(113, 129, 253, 0.1);
  color: var(--color-text-primary);
}

/* download */
.download {
  position: relative;
  text-align: center;
  overflow: hidden;
}
.download::before {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 60%;
  background: radial-gradient(60% 80% at 50% 100%, rgba(113, 129, 253, 0.2), transparent 70%);
  pointer-events: none;
}
.download-inner {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.download-icon {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  margin-bottom: var(--space-6);
  box-shadow: var(--shadow-phone);
}
.download-body {
  margin-top: var(--space-5);
  color: var(--color-text-secondary);
  font-size: 1.1rem;
}
.fine-print {
  margin-top: var(--space-6);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--color-text-tertiary);
}

/* ---------------------------------------------------------------- footer */
.site-footer {
  border-top: 1px solid var(--color-border);
  padding-block: var(--space-8) var(--space-6);
  background: var(--color-bg-deep);
  padding-bottom: calc(var(--space-6) + env(safe-area-inset-bottom, 0px));
}
.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 2fr) minmax(0, 1fr) minmax(0, 1fr);
  gap: var(--space-6);
}
.footer-brand {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
}
.footer-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
}
.footer-sub,
.footer-by {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
}
.footer-by {
  margin-top: var(--space-2);
  color: var(--color-text-tertiary);
}
.footer-heading {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-text-tertiary);
  margin-bottom: var(--space-3);
}
.footer-links a {
  display: block;
  padding-block: var(--space-2);
  color: var(--color-text-secondary);
  text-decoration: underline;
  text-decoration-color: var(--color-border-strong);
  text-underline-offset: 4px;
}
.footer-links a:hover {
  color: var(--color-text-primary);
  text-decoration-color: var(--color-brand-primary);
}
.footer-bottom {
  margin-top: var(--space-7);
  padding-top: var(--space-5);
  border-top: 1px solid var(--color-border);
  font-size: 0.8rem;
  color: var(--color-text-tertiary);
}

/* ---------------------------------------------------------------- motion */
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.45; transform: scale(0.8); }
}

.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity var(--dur) var(--ease-out), transform var(--dur) var(--ease-out);
}
.reveal.is-inview {
  opacity: 1;
  transform: none;
}
.annotation {
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 500ms var(--ease-out), transform 500ms var(--ease-out);
}
.hero-visual.is-inview .annotation {
  opacity: 1;
  transform: none;
}
.hero-visual.is-inview .a-1 { transition-delay: 500ms; }
.hero-visual.is-inview .a-2 { transition-delay: 750ms; }
.hero-visual.is-inview .a-3 { transition-delay: 950ms; }
.hero-visual.is-inview .a-4 { transition-delay: 1150ms; }
.hero-visual.is-inview .a-5 { transition-delay: 1400ms; }

.bodygraph {
  clip-path: inset(0 0 100% 0);
  transition: clip-path 1400ms var(--ease-out) 250ms;
}
.hero-visual.is-inview .bodygraph {
  clip-path: inset(0 0 0 0);
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal,
  .annotation,
  .bodygraph {
    opacity: 1;
    transform: none;
    clip-path: none;
    transition: none;
  }
  .live-dot { animation: none; }
  .btn:hover { transform: none; }
  [data-parallax-layer] { transform: none !important; }
}

/* ------------------------------------------------------------ responsive */
@media (max-width: 1100px) {
  .brand-sub { display: none; }
  .site-nav { gap: var(--space-4); font-size: 0.88rem; }
}

@media (max-width: 1024px) {
  .manifesto-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
  .manifesto-body { grid-column: 1 / -1; max-width: 60ch; }
  .manifesto-notes {
    grid-column: 1 / -1;
    flex-direction: row;
    flex-wrap: wrap;
    gap: var(--space-5);
  }
  .journey-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--space-6) var(--space-7);
  }
  .journey-steps::before { display: none; }
  .journey-step { padding-top: var(--space-5); padding-left: 0; border-top: 1px solid var(--color-border); }
  .journey-step::before { top: -7px; }
  .journey-step-key::after { display: none; }
  .journey-step-key { border-top-color: var(--color-brand-primary); }
}

@media (max-width: 900px) {
  .site-nav { display: none; }
  .brand-sub { display: none; }
  .hero-grid {
    grid-template-columns: 1fr;
  }
  /* Mobile: copy + CTA first, product visual follows. */
  .hero-visual {
    min-height: 0;
    margin-top: var(--space-7);
    padding-bottom: var(--space-6);
  }
  .phone-frame { width: min(250px, 66vw); }
  .annotation { font-size: 0.74rem; padding: 6px 10px; }
  .a-1 { left: 0; }
  .a-3 { top: 60%; }
  .a-5 { bottom: -4px; left: 4%; }
  .hero-scrollhint { display: none; }
  .showcase-grid,
  .showcase-grid-flip,
  .languages-grid,
  .journey-head {
    grid-template-columns: 1fr;
  }
  .showcase-grid-flip .showcase-copy { order: 1; }
  .showcase-grid-flip .showcase-media { order: 0; }
  .showcase-deep .showcase-copy { justify-self: start; }
  .showcase-initial .product-video,
  .showcase-deep .product-video { transform: none; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  .footer-brand { grid-column: 1 / -1; }
}

@media (max-width: 600px) {
  :root { --header-height: 60px; }
  .brand-mark { width: 30px; height: 30px; min-width: 30px; }
  .brand-name { font-size: 1.15rem; }
  .header-inner { gap: var(--space-3); }
  .header-actions { gap: var(--space-2); }
  .lang-select { padding: 0 var(--space-2); gap: 4px; }
  .lang-select-input { max-width: 5.5rem; font-size: 0.82rem; }
  .lang-select-icon { width: 16px; height: 16px; }
  .btn-small { padding: 0 var(--space-3); }
  .header-actions .app-store-link { display: none; }
  .cta-row .web-start-link { width: 100%; }
  /* Mobile: direct App Store CTA is the primary action; QR is unnecessary. */
  .qr-block { display: none; }
  .cta-row { margin-top: var(--space-6); }
  .btn-appstore { width: 100%; }
  .journey-steps { grid-template-columns: 1fr; }
  .manifesto-grid { grid-template-columns: 1fr; }
  .manifesto-notes { flex-direction: column; }
  .language-list { grid-template-columns: 1fr 1fr; }
  .lang-chip { font-size: 1.05rem; min-height: 56px; }
  .footer-grid { grid-template-columns: 1fr; }
  .product-video { width: min(320px, 100%); }
  .a-2 { top: 26%; }
  .a-4 { bottom: 16%; }
}

@media (max-width: 420px) {
  /* Icon alone carries the brand in the header on small phones; the hero lockup repeats the name. */
  .brand-name { display: none; }
}