:root {
  --bg-deep: #050a14;
  --bg: #0a192f;
  --blue: #2962ff;
  --blue-bright: #3d5afe;
  --navy: #122544;
  --navy-hover: #1a3558;
  --fg: #f4f7ff;
  --muted: #8892b0;
  --line: rgba(136, 146, 176, 0.28);
  --font-display: "Syne", "Noto Sans Arabic", "Noto Sans", "Noto Sans JP", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "DM Sans", "Noto Sans Arabic", "Noto Sans", "Noto Sans JP", "PingFang SC", "Microsoft YaHei", sans-serif;
  --pad-x: clamp(1.5rem, 6vw, 5rem);
  --content-max: 40rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--fg);
  font-family: var(--font-body);
  font-optical-sizing: auto;
  background: var(--bg-deep);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

.ambient {
  position: fixed;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(ellipse 80% 60% at 85% 20%, rgba(41, 98, 255, 0.45), transparent 58%),
    radial-gradient(ellipse 55% 45% at 10% 90%, rgba(41, 98, 255, 0.12), transparent 50%),
    #0a192f;
}

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

.top {
  position: absolute;
  top: 0;
  inset-inline-end: 0;
  z-index: 2;
  padding: 1.1rem 1.35rem;
}

.top-tools {
  display: flex;
  align-items: center;
  gap: 1.1rem;
}

.top-link {
  color: var(--muted);
  text-decoration: none;
  font: 500 0.88rem/1 var(--font-body);
  letter-spacing: 0.01em;
  padding: 0.45rem 0.2rem;
  transition: color 0.2s ease;
}

.top-link:hover,
.top-link:focus-visible,
.top-link.is-current {
  color: var(--fg);
  outline: none;
}

.top-bar {
  inset-inline: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.home-link {
  color: var(--fg);
  text-decoration: none;
  font-family: var(--font-display);
  font-weight: 650;
  font-size: 0.95rem;
  letter-spacing: 0.08em;
}

.home-link:hover,
.home-link:focus-visible {
  color: #fff;
  outline: none;
}

.lang {
  position: relative;
}

.lang-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 500 0.88rem/1 var(--font-body);
  letter-spacing: 0.01em;
  cursor: pointer;
  padding: 0.45rem 0.2rem;
  transition: color 0.2s ease;
}

.lang-btn:hover,
.lang-btn:focus-visible,
.lang.is-open .lang-btn {
  color: var(--fg);
  outline: none;
}

.lang-chevron {
  width: 0.4rem;
  height: 0.4rem;
  border-right: 1.5px solid currentColor;
  border-bottom: 1.5px solid currentColor;
  transform: rotate(45deg) translateY(-1px);
  opacity: 0.7;
  transition: transform 0.2s ease;
}

.lang.is-open .lang-chevron {
  transform: rotate(225deg) translateY(-1px);
}

.lang-menu {
  position: absolute;
  top: calc(100% + 0.35rem);
  inset-inline-end: 0;
  margin: 0;
  padding: 0.35rem 0;
  list-style: none;
  min-width: 8.5rem;
  background: rgba(10, 25, 47, 0.92);
  border: 1px solid var(--line);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.lang-menu[hidden] {
  display: none;
}

.lang-menu button {
  appearance: none;
  width: 100%;
  border: 0;
  background: transparent;
  color: var(--muted);
  font: 500 0.88rem/1.2 var(--font-body);
  text-align: start;
  padding: 0.55rem 0.9rem;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.lang-menu button:hover,
.lang-menu button:focus-visible {
  color: var(--fg);
  background: rgba(255, 255, 255, 0.05);
  outline: none;
}

.lang-menu li.is-active button {
  color: var(--fg);
}

.hero,
.features {
  width: 100%;
  max-width: calc(var(--content-max) + var(--pad-x) * 2);
  padding-left: var(--pad-x);
  padding-right: var(--pad-x);
  margin-inline: 0 auto;
}

.hero {
  min-height: 100vh;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: stretch;
  padding-top: clamp(5rem, 12vh, 7rem);
  padding-bottom: clamp(4rem, 10vh, 7rem);
}

.hero-logo,
.hero-title,
.hero-lead,
.cta-block {
  display: block;
  margin-inline: 0;
  text-align: start;
}

.hero-logo {
  width: min(100%, 20rem);
  height: auto;
  margin-bottom: 1.75rem;
  /* keep edges smooth when scaled down on retina */
  image-rendering: auto;
  -webkit-backface-visibility: hidden;
  backface-visibility: hidden;
  transform: translateY(18px) translateZ(0);
  opacity: 0;
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.05s forwards;
}

/* English / French: punchy headline */
html[data-tone="punch"] .hero-title {
  margin: 0 0 0.85rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 5.5vw, 3.35rem);
  letter-spacing: -0.03em;
  line-height: 1.12;
  color: var(--fg);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.18s forwards;
}

html[data-tone="punch"] .hero-lead {
  margin: 0 0 2rem;
  color: var(--muted);
  font-size: clamp(1rem, 2.2vw, 1.15rem);
  font-weight: 400;
  line-height: 1.55;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
}

/* Chinese / Japanese: calmer product line */
html[data-tone="calm"] .hero-logo {
  margin-bottom: 2.25rem;
}

html[data-tone="calm"] .hero-title {
  margin: 0 0 0.75rem;
  font-family: var(--font-body);
  font-weight: 500;
  font-size: clamp(1.35rem, 3.2vw, 1.75rem);
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--fg);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.18s forwards;
}

html[data-tone="calm"] .hero-lead {
  margin: 0 0 2.25rem;
  color: var(--muted);
  font-size: clamp(0.98rem, 2vw, 1.08rem);
  font-weight: 400;
  line-height: 1.65;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.3s forwards;
}

/* cta: no uppercase for CJK */
html[data-lang="zh"] .cta-note,
html[data-lang="ja"] .cta-note,
html[data-lang="ar"] .cta-note {
  text-transform: none;
  letter-spacing: 0.02em;
}

html[data-lang="ar"] .hero-title {
  font-family: "Noto Sans Arabic", var(--font-body);
  letter-spacing: 0;
}

html[dir="rtl"] .hero,
html[dir="rtl"] .features {
  margin-inline: auto 0;
}

.cta-block {
  margin: 0 0 1.35rem;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.42s forwards;
}

.cta-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.cta-invite {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin: 0;
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.48s forwards;
}

.store-btn {
  appearance: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 2.75rem;
  padding: 0.45rem 1.15rem 0.45rem 0.95rem;
  background: var(--navy);
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  text-decoration: none;
  font: 600 0.95rem/1 var(--font-body);
  letter-spacing: 0.06em;
  box-shadow: 0 8px 22px rgba(5, 10, 20, 0.35);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.store-btn:hover,
.store-btn:focus-visible {
  background: var(--navy-hover);
  box-shadow: 0 10px 26px rgba(5, 10, 20, 0.45);
  outline: none;
}

.store-btn-icon {
  width: 1.2rem;
  height: 1.2rem;
  flex-shrink: 0;
}

.store-btn-sm {
  min-height: 2.2rem;
  padding: 0.35rem 0.9rem 0.35rem 0.72rem;
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  box-shadow: none;
}

.store-btn-sm .store-btn-icon {
  width: 0.95rem;
  height: 0.95rem;
}

html[data-lang="zh"] .store-btn,
html[data-lang="ja"] .store-btn {
  letter-spacing: 0.08em;
}

html[data-lang="zh"] .store-btn-sm,
html[data-lang="ja"] .store-btn-sm {
  letter-spacing: 0.06em;
}

.sitelinks {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
  opacity: 0;
  transform: translateY(18px);
  animation: rise 0.9s cubic-bezier(0.22, 1, 0.36, 1) 0.56s forwards;
}

.sitelink {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
}

.sitelink:hover .sitelink-title,
.sitelink:focus-visible .sitelink-title {
  color: #aecbfa;
  outline: none;
}

.sitelink-copy {
  display: flex;
  flex-direction: column;
  gap: 0.28rem;
  min-width: 0;
}

.sitelink-title {
  color: #8ab4f8;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

html[data-lang="zh"] .sitelink-title,
html[data-lang="ja"] .sitelink-title,
html[data-lang="ar"] .sitelink-title {
  font-family: var(--font-body);
  letter-spacing: 0;
}

.sitelink-desc {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.sitelink-chevron {
  flex-shrink: 0;
  width: 0.42rem;
  height: 0.42rem;
  border-inline-end: 1.6px solid var(--muted);
  border-bottom: 1.6px solid var(--muted);
  transform: rotate(-45deg);
  opacity: 0.7;
}

html[dir="rtl"] .sitelink-chevron {
  transform: rotate(135deg);
}

.page-kicker {
  margin: 0 0 0.65rem;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-hero {
  min-height: 100vh;
  min-height: 100dvh;
}

.page-hint {
  margin: 1.25rem 0 0;
  max-width: 32rem;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.55;
}

@keyframes rise {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.features {
  padding-top: 0;
  padding-bottom: clamp(4rem, 10vh, 7rem);
}

.feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.feature-list li {
  padding: 1.65rem 0;
  border-bottom: 1px solid var(--line);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.4rem;
}

.feature-list h3,
.feature-list p {
  margin: 0;
  width: 100%;
  text-align: start;
}

.feature-list h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 650;
  letter-spacing: -0.02em;
}

.feature-list p {
  color: var(--muted);
  font-size: 0.98rem;
}

@media (prefers-reduced-motion: reduce) {
  .hero-logo,
  .hero-title,
  .hero-lead,
  .cta-block,
  .hero-actions,
  .sitelinks {
    opacity: 1;
    transform: none;
    animation: none;
  }
}