/* =========================================================
   平行岛 · AI 虚拟陪伴聊天应用 介绍页
   配色取自 App Logo：深紫黑夜色 + 粉紫渐变
   ========================================================= */

:root {
  --bg: #0a0512;
  --bg-soft: #120a20;
  --surface: rgba(255, 255, 255, 0.05);
  --surface-2: rgba(255, 255, 255, 0.035);
  --stroke: rgba(255, 255, 255, 0.09);
  --stroke-strong: rgba(255, 255, 255, 0.18);

  --text: #f6f1ff;
  --muted: #b0a1c7;
  --muted-2: #8b7ca4;

  --pink: #ff7fb6;
  --pink-deep: #f04c9b;
  --violet: #a05cff;
  --violet-deep: #7b3df5;

  --grad: linear-gradient(115deg, #ff8fc0 0%, #f04c9b 42%, #9b5cff 100%);
  --grad-soft: linear-gradient(160deg, rgba(255, 127, 182, 0.16), rgba(155, 92, 255, 0.1));

  --radius-lg: 26px;
  --radius: 18px;
  --radius-sm: 12px;

  --shadow-lg: 0 40px 80px -30px rgba(0, 0, 0, 0.85);
  --shadow-glow: 0 20px 60px -24px rgba(240, 76, 155, 0.55);

  --header-h: 78px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 18px);
  -webkit-text-size-adjust: 100%;
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei", "Source Han Sans SC",
    -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  overflow-x: clip;
}

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

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

h1, h2, h3 {
  margin: 0;
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.2;
}

p {
  margin: 0;
}

ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  cursor: pointer;
}

/* 未填写地址的图片：隐藏占位破损图标，等待替换为真实图片 */
img[src=""],
img:not([src]) {
  opacity: 0;
}

.container {
  width: min(1200px, 100% - 48px);
  margin-inline: auto;
}

/* ---------- 背景光效 ---------- */
.bg-decor {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.55;
}

.orb--pink {
  width: 46vw;
  height: 46vw;
  top: -16vw;
  right: -10vw;
  background: radial-gradient(circle, rgba(240, 76, 155, 0.55), transparent 68%);
}

.orb--violet {
  width: 52vw;
  height: 52vw;
  top: 22vh;
  left: -20vw;
  background: radial-gradient(circle, rgba(123, 61, 245, 0.42), transparent 70%);
}

.orb--deep {
  width: 40vw;
  height: 40vw;
  bottom: -14vw;
  right: 8vw;
  background: radial-gradient(circle, rgba(155, 92, 255, 0.28), transparent 70%);
}

.grid-glow {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 72px 72px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 10%, transparent 78%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 10%, transparent 78%);
}

/* ---------- 通用文本 ---------- */
.text-grad {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.eyebrow {
  display: inline-block;
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--pink);
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 26px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
    background-color 0.35s var(--ease), border-color 0.35s var(--ease), opacity 0.35s var(--ease);
}

.btn--primary {
  background: var(--grad);
  color: #1a0620;
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 26px 70px -22px rgba(240, 76, 155, 0.8);
}

.btn--ghost {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--stroke-strong);
  color: var(--text);
  backdrop-filter: blur(6px);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, 0.1);
  border-color: rgba(255, 255, 255, 0.3);
  transform: translateY(-2px);
}

.btn--sm {
  padding: 10px 20px;
  font-size: 0.9rem;
}

/* ---------- 顶部导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  border-bottom: 1px solid transparent;
  background: rgba(10, 5, 18, 0.55);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: background-color 0.4s var(--ease), border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease);
}

.site-header.is-scrolled {
  background: rgba(10, 5, 18, 0.9);
  border-bottom-color: var(--stroke);
  box-shadow: 0 20px 40px -30px rgba(0, 0, 0, 0.9);
}

.header-inner {
  display: flex;
  align-items: center;
  gap: 28px;
  min-height: var(--header-h);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}

.brand-logo-box {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 13px;
  background:
    radial-gradient(circle at 32% 26%, rgba(255, 143, 192, 0.85), transparent 58%),
    linear-gradient(150deg, #2a1240, #53179a 60%, #b3298a);
  box-shadow: 0 8px 22px -10px rgba(240, 76, 155, 0.9);
  overflow: hidden;
}

.brand-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.brand-name {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-name strong {
  font-size: 1.1rem;
  font-weight: 800;
  letter-spacing: 0.06em;
}

.brand-name em {
  font-style: normal;
  font-size: 0.66rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted-2);
}

.nav {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: auto;
}

.nav a {
  position: relative;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.94rem;
  font-weight: 500;
  color: var(--muted);
  transition: color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.nav a:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
}

.nav a.is-active {
  color: var(--text);
  background: rgba(255, 255, 255, 0.07);
}

.nav a.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  width: 16px;
  height: 2px;
  border-radius: 2px;
  background: var(--grad);
  transform: translateX(-50%);
}

.header-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 12px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.05);
  padding: 11px 10px;
  flex-direction: column;
  justify-content: space-between;
  flex-shrink: 0;
}

.nav-toggle span {
  display: block;
  height: 2px;
  width: 100%;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.35s var(--ease), opacity 0.25s var(--ease);
}

.nav-toggle[aria-expanded="true"] span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] span:nth-child(2) {
  opacity: 0;
}

.nav-toggle[aria-expanded="true"] span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

/* ---------- 首屏 ---------- */
.hero {
  position: relative;
  z-index: 1;
  padding: clamp(46px, 7vw, 96px) 0 clamp(56px, 8vw, 110px);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(0, 0.98fr);
  align-items: center;
  gap: clamp(32px, 5vw, 72px);
}

.pill {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 7px 16px 7px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255, 127, 182, 0.32);
  background: rgba(240, 76, 155, 0.1);
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: #ffc7de;
}

.pill .dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pink);
  box-shadow: 0 0 0 4px rgba(255, 127, 182, 0.18);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255, 127, 182, 0.16); }
  50% { box-shadow: 0 0 0 8px rgba(255, 127, 182, 0.04); }
}

.hero-title {
  margin: 24px 0 20px;
  font-size: clamp(2.15rem, 4.6vw, 3.75rem);
  letter-spacing: -0.03em;
  line-height: 1.14;
}

.hero-lede {
  max-width: 47ch;
  color: var(--muted);
  font-size: clamp(0.96rem, 1.1vw, 1.06rem);
  line-height: 1.85;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.meta-chip {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 20px;
  border-radius: 14px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.04);
  min-width: 132px;
}

.meta-label {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--muted-2);
}

.meta-value {
  font-size: 1.12rem;
  font-weight: 800;
  letter-spacing: 0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 32px;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  margin-top: 40px;
  padding-top: 26px;
  border-top: 1px solid var(--stroke);
}

.hero-stats li {
  display: flex;
  flex-direction: column;
}

.hero-stats strong {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: 0.01em;
}

.hero-stats span {
  font-size: 0.8rem;
  color: var(--muted-2);
}

/* 首屏截图 */
.hero-visual {
  position: relative;
  display: grid;
  place-items: center;
}

.hero-visual::before {
  content: "";
  position: absolute;
  inset: 6% -8% -8% -8%;
  border-radius: 50%;
  background: radial-gradient(ellipse at 50% 50%, rgba(240, 76, 155, 0.36), transparent 66%);
  filter: blur(55px);
  z-index: -1;
}

/* 三卡叠加容器 */
.visual-stack {
  position: relative;
  width: min(480px, 100%);
  aspect-ratio: 3 / 4;
  perspective: 1200px;
  transform-style: preserve-3d;
}

.visual-stack::before,
.visual-stack::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  pointer-events: none;
}

.visual-stack::before {
  width: 72%;
  height: 64%;
  background: radial-gradient(circle, rgba(123, 61, 245, 0.34), transparent 68%);
  filter: blur(28px);
}

.visual-stack::after {
  width: 88%;
  height: 78%;
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* 单张手机卡 */
.phone-card {
  --card-w: min(248px, 56%);
  --card-h: calc(var(--card-w) * 19.5 / 9);
  position: absolute;
  left: 50%;
  top: 50%;
  width: var(--card-w);
  height: var(--card-h);
  margin-left: calc(var(--card-w) / -2);
  margin-top: calc(var(--card-h) / -2);
  border-radius: 32px;
  padding: 12px;
  background: linear-gradient(180deg, #0c0616, #1b0c2e);
  box-shadow:
    0 30px 70px -26px rgba(0, 0, 0, 0.9),
    0 0 0 1px rgba(255, 255, 255, 0.08) inset,
    0 0 0 2px rgba(255, 255, 255, 0.03);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 8px;
  transition:
    transform 0.6s cubic-bezier(0.22, 0.61, 0.36, 1),
    opacity 0.4s var(--ease),
    filter 0.4s var(--ease),
    z-index 0s linear 0.4s,
    box-shadow 0.5s var(--ease);
  will-change: transform, opacity;
  z-index: 2;
  cursor: pointer;
}

.phone-frame {
  position: absolute;
  inset: 0;
  border-radius: 32px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.phone-notch {
  position: absolute;
  left: 50%;
  top: 12px;
  transform: translateX(-50%);
  width: 90px;
  height: 22px;
  border-radius: 14px;
  background: #08030f;
  z-index: 4;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.4);
}

.phone-img {
  flex: 1;
  position: relative;
  z-index: 2;
  width: 100%;
  object-fit: cover;
  border-radius: 20px;
  background:
    linear-gradient(150deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
    radial-gradient(circle at 24% 22%, rgba(240, 76, 155, 0.42), transparent 58%),
    radial-gradient(circle at 78% 82%, rgba(123, 61, 245, 0.48), transparent 60%),
    #160c26;
  overflow: hidden;
}

.phone-img::after {
  content: "竖版应用截图占位";
  position: absolute;
  inset: auto 0 14px;
  text-align: center;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: rgba(246, 241, 255, 0.42);
}

.phone-cap {
  position: relative;
  z-index: 3;
  margin: 0;
  text-align: center;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  font-weight: 600;
  color: rgba(246, 241, 255, 0.6);
  text-transform: uppercase;
  transition: color 0.4s var(--ease);
}

/* 初始叠放状态：左偏、中凸、右偏 */
.phone-card--l {
  transform: translate(-62%, -4%) rotate(-14deg) scale(0.8);
  z-index: 2;
}

.phone-card--c {
  transform: translate(0, -6%) rotate(0deg) scale(0.92);
  z-index: 4;
}

.phone-card--r {
  transform: translate(62%, -4%) rotate(14deg) scale(0.8);
  z-index: 2;
}

/* 容器 hover：整体层级与过渡时机 */
.visual-stack:hover .phone-card {
  transition-delay: 0.05s;
}

/* 当前悬停的卡片：居中放大，恢复全清晰 */
.phone-card:hover,
.phone-card.is-active {
  transform: translate(0, -4%) rotate(0deg) scale(1.05);
  opacity: 1;
  filter: none;
  z-index: 99;
  transition-delay: 0s;
  box-shadow:
    0 44px 90px -26px rgba(240, 76, 155, 0.45),
    0 0 0 1px rgba(255, 255, 255, 0.14) inset,
    0 0 0 2px rgba(255, 255, 255, 0.04);
}

.phone-card:hover .phone-cap,
.phone-card.is-active .phone-cap {
  color: #ffc7de;
}

/* 兄弟卡片后退 */
.visual-stack:hover .phone-card:not(:hover):not(.is-active) {
  opacity: 0.55;
  filter: saturate(0.75) brightness(0.72) blur(1px);
}

.visual-stack:hover .phone-card--l:not(:hover):not(.is-active) {
  transform: translate(-74%, -2%) rotate(-18deg) scale(0.72);
}

.visual-stack:hover .phone-card--c:not(:hover):not(.is-active) {
  transform: translate(0, -14%) rotate(0deg) scale(0.82);
}

.visual-stack:hover .phone-card--r:not(:hover):not(.is-active) {
  transform: translate(74%, -2%) rotate(18deg) scale(0.72);
}

/* ---------- 区块通用 ---------- */
.section {
  position: relative;
  z-index: 1;
  padding: clamp(64px, 9vw, 120px) 0;
}

.section-head {
  max-width: 720px;
  margin-bottom: clamp(34px, 5vw, 58px);
}

.section-head h2 {
  margin: 14px 0 14px;
  font-size: clamp(1.65rem, 3.2vw, 2.6rem);
  line-height: 1.22;
}

.section-head p {
  color: var(--muted);
  font-size: clamp(0.94rem, 1.05vw, 1.02rem);
}

.card {
  border-radius: var(--radius);
  border: 1px solid var(--stroke);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.055), rgba(255, 255, 255, 0.02));
  transition: transform 0.4s var(--ease), border-color 0.4s var(--ease),
    box-shadow 0.4s var(--ease), background-color 0.4s var(--ease);
}

/* ---------- 功能亮点 ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.feature-card {
  padding: 28px 26px 30px;
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 8%, rgba(240, 76, 155, 0.22), transparent 55%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
}

.feature-card:hover {
  transform: translateY(-5px);
  border-color: rgba(255, 127, 182, 0.4);
  box-shadow: 0 30px 60px -34px rgba(240, 76, 155, 0.75);
}

.feature-card:hover::before {
  opacity: 1;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  border-radius: 14px;
  color: #ffd9e9;
  background: var(--grad-soft);
  border: 1px solid rgba(255, 127, 182, 0.28);
  position: relative;
}

.feature-card h3 {
  font-size: 1.08rem;
  margin-bottom: 9px;
  letter-spacing: 0.01em;
}

.feature-card p {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.8;
}

/* ---------- 用户评价 ---------- */
.section--reviews {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.018), transparent 60%);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.review-card {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 26px 24px;
}

.review-card:hover {
  transform: translateY(-4px);
  border-color: var(--stroke-strong);
  background: linear-gradient(160deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.025));
}

.review-top {
  display: flex;
  align-items: center;
  gap: 12px;
}

.avatar {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 50%;
  font-size: 1rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(140deg, #ff8fc0, #f04c9b 45%, #8b4bff);
  box-shadow: 0 10px 24px -14px rgba(240, 76, 155, 0.95);
}

.review-card:nth-child(2n) .avatar {
  background: linear-gradient(140deg, #b58bff, #8b4bff 48%, #f04c9b);
}

.review-card:nth-child(3n) .avatar {
  background: linear-gradient(140deg, #ff9ec8, #c24bea 52%, #6d3bf5);
}

.review-who {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
  min-width: 0;
}

.review-who strong {
  font-size: 0.98rem;
}

.review-who span {
  font-size: 0.76rem;
  color: var(--muted-2);
  letter-spacing: 0.04em;
}

.stars {
  margin-left: auto;
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: #ffb45f;
}

.review-text {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.85;
}

/* ---------- 常见问题 ---------- */
.faq-list {
  max-width: 880px;
  border-top: 1px solid var(--stroke);
}

.faq-item {
  border-bottom: 1px solid var(--stroke);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 24px 4px;
  text-align: left;
  font-size: clamp(0.98rem, 1.15vw, 1.06rem);
  font-weight: 600;
  color: var(--text);
  transition: color 0.3s var(--ease);
}

.faq-q:hover {
  color: var(--pink);
}

.faq-mark {
  position: relative;
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--stroke-strong);
  transition: transform 0.4s var(--ease), background-color 0.4s var(--ease),
    border-color 0.4s var(--ease);
}

.faq-mark::before,
.faq-mark::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: 11px;
  height: 1.6px;
  border-radius: 2px;
  background: var(--text);
  transform: translate(-50%, -50%);
  transition: opacity 0.3s var(--ease), background-color 0.3s var(--ease);
}

.faq-mark::after {
  transform: translate(-50%, -50%) rotate(90deg);
}

.faq-q[aria-expanded="true"] .faq-mark {
  background: var(--grad);
  border-color: transparent;
  transform: rotate(90deg);
}

.faq-q[aria-expanded="true"] .faq-mark::before,
.faq-q[aria-expanded="true"] .faq-mark::after {
  background: #1a0620;
}

.faq-q[aria-expanded="true"] .faq-mark::after {
  opacity: 0;
}

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.45s var(--ease), opacity 0.4s var(--ease);
  opacity: 0;
}

.faq-a > p {
  overflow: hidden;
  min-height: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.85;
  max-width: 68ch;
  padding-right: 40px;
}

.faq-item.is-open .faq-a {
  grid-template-rows: 1fr;
  opacity: 1;
}

.faq-item.is-open .faq-a > p {
  padding-bottom: 26px;
}

/* ---------- 下载 ---------- */
.download-section {
  padding-bottom: clamp(76px, 9vw, 130px);
}

.download-card {
  position: relative;
  padding: clamp(34px, 5vw, 66px) clamp(24px, 4vw, 60px);
  border-radius: clamp(24px, 3vw, 34px);
  border: 1px solid rgba(255, 127, 182, 0.22);
  background:
    radial-gradient(circle at 12% 0%, rgba(240, 76, 155, 0.28), transparent 52%),
    radial-gradient(circle at 92% 100%, rgba(123, 61, 245, 0.36), transparent 55%),
    linear-gradient(160deg, rgba(255, 255, 255, 0.07), rgba(255, 255, 255, 0.015));
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  text-align: center;
}

.download-card::after {
  content: "";
  position: absolute;
  inset: -40% -10% auto;
  height: 60%;
  background: radial-gradient(ellipse at 50% 0%, rgba(255, 143, 192, 0.22), transparent 62%);
  pointer-events: none;
}

.download-head {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.download-logo-box {
  width: 74px;
  height: 74px;
  display: grid;
  place-items: center;
  margin-bottom: 20px;
  border-radius: 22px;
  overflow: hidden;
  background:
    radial-gradient(circle at 32% 26%, rgba(255, 143, 192, 0.9), transparent 58%),
    linear-gradient(150deg, #2a1240, #53179a 60%, #b3298a);
  box-shadow: 0 22px 44px -18px rgba(240, 76, 155, 0.85);
}

.download-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.download-card h2 {
  margin: 14px 0 12px;
  font-size: clamp(1.6rem, 3.4vw, 2.7rem);
}

.download-card > .download-head > p {
  color: var(--muted);
  font-size: 0.95rem;
}

.store-buttons {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 18px;
  margin: clamp(28px, 4vw, 42px) 0 24px;
}

.store-btn {
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 244px;
  padding: 16px 24px;
  border-radius: 20px;
  border: 1px solid transparent;
  text-align: left;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease),
    background-color 0.35s var(--ease), border-color 0.35s var(--ease);
}

.store-btn--android {
  background: var(--grad);
  color: #1a0620;
  box-shadow: 0 24px 55px -26px rgba(240, 76, 155, 0.95);
}

.store-btn--android:hover {
  transform: translateY(-4px);
  box-shadow: 0 32px 70px -26px rgba(240, 76, 155, 1);
}

.store-btn--ios {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--stroke-strong);
  color: var(--text);
  backdrop-filter: blur(8px);
}

.store-btn--ios:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.34);
}

.store-icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  flex-shrink: 0;
  border-radius: 12px;
  background: rgba(0, 0, 0, 0.16);
}

.store-btn--ios .store-icon {
  background: rgba(255, 255, 255, 0.09);
}

.store-text {
  display: flex;
  flex-direction: column;
  line-height: 1.3;
}

.store-text small {
  font-size: 0.74rem;
  font-weight: 500;
  opacity: 0.78;
  letter-spacing: 0.04em;
}

.store-text strong {
  font-size: 1.06rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.store-arrow {
  margin-left: auto;
  opacity: 0.7;
}

.download-tags {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
}

.download-tags span {
  padding: 6px 14px;
  border-radius: 999px;
  border: 1px solid var(--stroke);
  background: rgba(255, 255, 255, 0.04);
  font-size: 0.78rem;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--stroke);
  background: rgba(8, 4, 14, 0.7);
  padding: clamp(38px, 5vw, 58px) 0 34px;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.footer-logo-box {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 13px;
  overflow: hidden;
  background:
    radial-gradient(circle at 32% 26%, rgba(255, 143, 192, 0.8), transparent 58%),
    linear-gradient(150deg, #2a1240, #53179a 60%, #b3298a);
}

.footer-logo {
  width: 100%;
  height: 100%;
  object-fit: contain;
}

.footer-brand strong {
  font-size: 1.04rem;
  letter-spacing: 0.06em;
}

.footer-brand p {
  font-size: 0.82rem;
  color: var(--muted-2);
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-nav a {
  font-size: 0.88rem;
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.footer-nav a:hover {
  color: var(--pink);
}

.footer-note {
  font-size: 0.78rem;
  line-height: 1.8;
  color: var(--muted-2);
  max-width: 78ch;
}

.footer-copy {
  font-size: 0.76rem;
  color: rgba(176, 161, 199, 0.55);
  letter-spacing: 0.04em;
}

/* ---------- 滚动入场 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s var(--ease) var(--d, 0s), transform 0.75s var(--ease) var(--d, 0s);
  will-change: opacity, transform;
}

.reveal.in {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .feature-grid,
  .review-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
  }

  .visual-stack {
    --card-w: min(220px, 52%);
    width: min(440px, 100%);
  }
}

@media (max-width: 900px) {
  :root {
    --header-h: 68px;
  }

  .header-cta {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  .nav {
    position: absolute;
    top: calc(100% + 10px);
    left: 24px;
    right: 24px;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px;
    border-radius: 20px;
    border: 1px solid var(--stroke);
    background: rgba(18, 10, 32, 0.96);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease), visibility 0.3s;
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav a {
    padding: 12px 16px;
    border-radius: 12px;
    font-size: 1rem;
  }

  .nav a.is-active::after {
    display: none;
  }

  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 44px;
  }

  .hero-visual {
    order: 2;
  }

  .hero-title {
    font-size: clamp(2.1rem, 7vw, 2.9rem);
  }

  .hero-lede {
    max-width: none;
  }
}

@media (max-width: 680px) {
  .container {
    width: calc(100% - 36px);
  }

  .feature-grid,
  .review-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-stats {
    gap: 16px 26px;
  }

  .hero-stats strong {
    font-size: 1.2rem;
  }

  .visual-stack {
    --card-w: min(176px, 62%);
    width: min(380px, 100%);
    perspective: 900px;
  }

  .phone-card {
    border-radius: 26px;
    padding: 10px;
  }

  .phone-notch {
    width: 68px;
    height: 18px;
    top: 10px;
    border-radius: 12px;
  }

  .phone-card--l {
    transform: translate(-48%, -2%) rotate(-11deg) scale(0.76);
  }

  .phone-card--c {
    transform: translate(0, -4%) rotate(0deg) scale(0.9);
  }

  .phone-card--r {
    transform: translate(48%, -2%) rotate(11deg) scale(0.76);
  }

  .visual-stack:hover .phone-card--l:not(:hover):not(.is-active) {
    transform: translate(-58%, 0%) rotate(-14deg) scale(0.68);
  }

  .visual-stack:hover .phone-card--c:not(:hover):not(.is-active) {
    transform: translate(0, -10%) rotate(0deg) scale(0.8);
  }

  .visual-stack:hover .phone-card--r:not(:hover):not(.is-active) {
    transform: translate(58%, 0%) rotate(14deg) scale(0.68);
  }

  .phone-card:hover,
  .phone-card.is-active {
    transform: translate(0, -2%) rotate(0deg) scale(1);
  }

  .store-btn {
    width: 100%;
    min-width: 0;
    justify-content: flex-start;
  }

  .store-buttons {
    gap: 12px;
  }

  .faq-q {
    padding: 20px 2px;
    gap: 14px;
  }

  .faq-a > p {
    padding-right: 8px;
  }

  .faq-mark {
    width: 26px;
    height: 26px;
  }

  .meta-chip {
    flex: 1 1 130px;
    min-width: 0;
  }

  .hero-actions .btn {
    flex: 1 1 160px;
  }
}

@media (max-width: 400px) {
  .brand-name em {
    display: none;
  }

  .hero-meta {
    gap: 10px;
  }

  .meta-chip {
    padding: 9px 14px;
  }
}

/* ---------- 无障碍 / 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }

  .reveal {
    opacity: 1;
    transform: none;
  }
}