:root {
  --brand: #d80120;
  --brand-deep: #9e0118;
  --ink: #14181f;
  --muted: #5c6573;
  --paper: #eef1f5;
  --line: rgba(20, 24, 31, 0.1);
  --shadow: 0 16px 36px rgba(216, 1, 32, 0.2);
  --radius: 16px;
  --font-zh-display: "ZCOOL XiaoWei", "Noto Serif SC", serif;
  --font-zh: "Noto Sans SC", sans-serif;
  /* AlkatipBT：fonts-ug.css 内 base64 嵌入，与 App 维文一致 */
  --font-ug: "AlkatipBT", "Noto Sans SC", serif;
}

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

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  min-height: 100dvh;
  color: var(--ink);
  font-family: var(--font-zh);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body[data-lang="ug"] {
  font-family: var(--font-ug);
}

body[data-lang="ug"] .brand__name,
body[data-lang="ug"] .headline {
  font-family: var(--font-ug);
}

.bg {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.bg__wash {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(110% 70% at 50% -8%, rgba(255, 255, 255, 0.95) 0%, transparent 50%),
    linear-gradient(168deg, #f4f6f9 0%, #e8edf3 42%, #dfe6ef 100%);
}

.bg__orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(10px);
}

.bg__orb--a {
  width: 260px;
  height: 260px;
  top: -50px;
  right: -50px;
  background: radial-gradient(circle at 35% 35%, rgba(216, 1, 32, 0.45), rgba(216, 1, 32, 0.12) 55%, transparent 70%);
  animation: drift 12s ease-in-out infinite alternate;
}

.bg__orb--b {
  width: 240px;
  height: 240px;
  bottom: 6%;
  left: -80px;
  background: radial-gradient(circle at 55% 40%, rgba(70, 100, 140, 0.22), rgba(70, 100, 140, 0.06) 60%, transparent 72%);
  animation: drift 14s ease-in-out infinite alternate-reverse;
}

.bg__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(20, 24, 31, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(20, 24, 31, 0.035) 1px, transparent 1px);
  background-size: 32px 32px;
  mask-image: radial-gradient(ellipse 75% 65% at 50% 38%, #000 15%, transparent 75%);
}

.top,
.hero,
.foot {
  position: relative;
  z-index: 1;
}

.top {
  display: flex;
  justify-content: flex-end;
  padding: max(16px, env(safe-area-inset-top)) 20px 0;
}

body[data-lang="ug"] .top {
  justify-content: flex-start;
}

.lang {
  appearance: none;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.62);
  backdrop-filter: blur(10px);
  color: var(--ink);
  font: 500 14px/1 var(--font-zh);
  padding: 8px 14px;
  border-radius: 10px;
  cursor: pointer;
  transition: background 0.2s ease, transform 0.2s ease;
}

body[data-lang="zh"] .lang {
  font-family: var(--font-ug);
}

.lang:active {
  transform: scale(0.97);
}

.hero {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: 8vh 24px 32px;
  max-width: 420px;
  margin: 0 auto;
  min-height: calc(100dvh - 120px);
  justify-content: center;
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  margin-bottom: 28px;
  animation: rise 0.7s ease both;
}

.brand__icon {
  width: 88px;
  height: 88px;
  border-radius: 22px;
  box-shadow: var(--shadow);
  animation: float 5.5s ease-in-out infinite;
}

.brand__name {
  margin: 0;
  font-family: var(--font-zh-display);
  font-size: clamp(2.4rem, 9vw, 3.1rem);
  font-weight: 400;
  letter-spacing: 0.04em;
  line-height: 1.15;
  color: var(--ink);
}

body[data-lang="ug"] .brand__name {
  letter-spacing: 0;
  font-size: clamp(2.1rem, 8vw, 2.7rem);
}

.headline {
  margin: 0 0 12px;
  font-family: var(--font-zh-display);
  font-size: clamp(1.35rem, 5.2vw, 1.65rem);
  font-weight: 400;
  line-height: 1.35;
  color: var(--ink);
  animation: rise 0.75s ease 0.08s both;
}

.lead {
  margin: 0 0 36px;
  max-width: 20em;
  font-size: 0.98rem;
  font-weight: 400;
  line-height: 1.7;
  color: var(--muted);
  animation: rise 0.75s ease 0.14s both;
}

body[data-lang="ug"] .lead,
body[data-lang="ug"] .hint,
body[data-lang="ug"] .foot {
  line-height: 1.9;
}

.cta {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  width: min(100%, 280px);
  padding: 16px 22px 14px;
  border-radius: var(--radius);
  text-decoration: none;
  color: #fff;
  background: linear-gradient(180deg, #ef243b 0%, var(--brand) 48%, var(--brand-deep) 100%);
  box-shadow: var(--shadow);
  transition: transform 0.2s ease, filter 0.2s ease;
  animation: rise 0.8s ease 0.2s both;
}

.cta:hover {
  filter: brightness(1.03);
}

.cta:active {
  transform: translateY(1px) scale(0.985);
}

.cta__label {
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: 0.06em;
}

body[data-lang="ug"] .cta__label {
  letter-spacing: 0;
  font-size: 1.2rem;
}

.cta__meta {
  font-size: 0.78rem;
  font-weight: 500;
  opacity: 0.88;
}

.hint {
  margin: 18px 0 0;
  max-width: 22em;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--muted);
  animation: rise 0.8s ease 0.28s both;
}

.foot {
  padding: 0 20px max(20px, env(safe-area-inset-bottom));
  text-align: center;
  font-size: 0.78rem;
  color: rgba(20, 24, 31, 0.42);
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(14px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-6px);
  }
}

@keyframes drift {
  from {
    transform: translate3d(0, 0, 0);
  }
  to {
    transform: translate3d(-18px, 22px, 0);
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}

@media (min-width: 768px) {
  .hero {
    max-width: 460px;
    padding-top: 10vh;
  }

  .brand__icon {
    width: 96px;
    height: 96px;
    border-radius: 24px;
  }
}