/* =========================================================
   星念AI · 产品介绍页
   配色取自应用图标：紫罗兰渐变 + 金色星光
   ========================================================= */

:root {
  --brand: #6c5ce7;
  --brand-strong: #5a47e0;
  --brand-deep: #3b2a8c;
  --brand-light: #9a8cff;
  --brand-soft: #efebff;

  --gold: #f6b94a;
  --gold-light: #ffd98a;

  --ink: #191233;
  --ink-2: #3a3352;
  --muted: #7a7392;
  --line: rgba(25, 18, 51, 0.08);

  --bg: #fbfaff;
  --surface: #ffffff;

  --dark-900: #100a26;
  --dark-800: #150e33;
  --dark-700: #1e1547;

  --container: 1140px;
  --radius: 22px;
  --shadow-card: 0 18px 44px -30px rgba(30, 20, 60, 0.45);

  --ease: cubic-bezier(0.2, 0.8, 0.25, 1);
}

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

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

body {
  margin: 0;
  font-family: "PingFang SC", "HarmonyOS Sans SC", "Microsoft YaHei",
    "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  color: var(--ink);
  background: var(--bg);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1,
h2,
h3,
p,
figure,
ul {
  margin: 0;
}

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

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

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

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

svg {
  display: block;
}

::selection {
  background: rgba(108, 92, 231, 0.24);
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
  border-radius: 6px;
}

.container {
  width: min(var(--container), 92vw);
  margin-inline: auto;
}

.section {
  padding: 112px 0;
  scroll-margin-top: 86px;
}

.skip-link {
  position: fixed;
  top: -60px;
  left: 16px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: 10px;
  background: #fff;
  color: var(--ink);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: top 0.25s var(--ease);
}

.skip-link:focus {
  top: 14px;
}

/* ================= 通用：章节标题 ================= */
.eyebrow {
  display: inline-block;
  font-size: 12.5px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: var(--brand);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.section-head {
  max-width: 660px;
  margin: 0 auto 60px;
  text-align: center;
}

.section-head h2 {
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1.35;
  letter-spacing: -0.015em;
  font-weight: 700;
}

.section-head p {
  margin-top: 16px;
  color: var(--muted);
  font-size: 16px;
}

/* ================= 按钮 ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 15px 30px;
  border-radius: 999px;
  font-size: 15.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.btn-primary {
  color: #fff;
  background: linear-gradient(135deg, #8b7cf6 0%, #5a47e0 60%, #4b38c7 100%);
  box-shadow: 0 16px 34px -14px rgba(108, 92, 231, 0.85),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 22px 44px -16px rgba(108, 92, 231, 0.95),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

.btn-ghost {
  color: #fff;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.24);
  backdrop-filter: blur(6px);
}

.btn-ghost:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.4);
}

/* ================= 顶部导航 ================= */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: 74px;
  display: flex;
  align-items: center;
  background: rgba(16, 10, 40, 0.55);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  transition: height 0.3s var(--ease), background 0.3s var(--ease),
    border-color 0.3s var(--ease);
}

.site-header.is-scrolled {
  height: 64px;
  background: rgba(13, 8, 34, 0.9);
  border-bottom-color: rgba(255, 255, 255, 0.1);
}

.header-inner {
  width: min(1200px, 92vw);
  margin-inline: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  flex: none;
}

.brand-mark {
  position: relative;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  overflow: hidden;
  flex: none;
  background: radial-gradient(circle at 72% 22%, var(--gold) 0 3px, transparent 4px),
    linear-gradient(145deg, #8b7cf6, #5a47e0);
  box-shadow: 0 8px 18px -6px rgba(90, 71, 224, 0.85);
}

.logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.logo-img[src=""] {
  opacity: 0;
}

.brand-name {
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.brand-ai {
  color: var(--gold-light);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-link {
  position: relative;
  padding: 10px 15px;
  border-radius: 999px;
  font-size: 14.5px;
  color: rgba(255, 255, 255, 0.76);
  transition: color 0.25s var(--ease), background 0.25s var(--ease);
}

.nav-link:hover {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
}

.nav-download {
  margin-left: 10px;
  padding: 11px 22px;
  font-weight: 600;
  color: #2b1c05;
  background: linear-gradient(135deg, #ffe3a6, var(--gold));
  box-shadow: 0 10px 24px -12px rgba(246, 185, 74, 0.9);
}

.nav-download:hover {
  color: #2b1c05;
  background: linear-gradient(135deg, #ffeec4, #ffc866);
}

.nav-toggle {
  display: none;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.2);
  align-items: center;
  justify-content: center;
  flex-direction: column;
  gap: 5px;
  flex: none;
}

.nav-toggle span {
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: #fff;
  transition: transform 0.3s var(--ease), opacity 0.2s var(--ease);
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav-toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ================= 首屏 ================= */
.hero {
  position: relative;
  display: flex;
  align-items: center;
  min-height: 100svh;
  padding: 148px 0 96px;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(900px 620px at 84% 14%, rgba(154, 140, 255, 0.4), transparent 62%),
    radial-gradient(720px 520px at 8% 82%, rgba(246, 185, 74, 0.16), transparent 62%),
    linear-gradient(160deg, #130c2e 0%, #1e1547 48%, #2a1c64 100%);
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 82% 62% at 52% 34%, #000 18%, transparent 76%);
  mask-image: radial-gradient(ellipse 82% 62% at 52% 34%, #000 18%, transparent 76%);
  opacity: 0.7;
}

.orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  pointer-events: none;
}

.orb-1 {
  width: 420px;
  height: 420px;
  top: -120px;
  right: -80px;
  background: rgba(139, 124, 246, 0.38);
}

.orb-2 {
  width: 340px;
  height: 340px;
  bottom: -140px;
  left: -100px;
  background: rgba(246, 185, 74, 0.16);
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 48px;
}

.hero-copy {
  max-width: 580px;
}

.eyebrow-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 15px;
  border-radius: 999px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.85);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(6px);
}

.eyebrow-pill svg {
  color: var(--gold);
}

.hero h1 {
  margin: 26px 0 22px;
  font-size: clamp(38px, 4.6vw, 60px);
  line-height: 1.16;
  font-weight: 700;
  letter-spacing: -0.025em;
}

.hero h1 .accent {
  display: inline-block;
  background: linear-gradient(100deg, #ffe7b8 0%, var(--gold) 52%, #ffd98a 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-desc {
  max-width: 520px;
  font-size: 16.5px;
  line-height: 1.95;
  color: rgba(255, 255, 255, 0.72);
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: 24px;
}

.hero-tags li {
  padding: 6px 13px;
  border-radius: 999px;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.78);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.hero-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 24px;
  max-width: 520px;
  margin-top: 34px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.meta-item span {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: rgba(255, 255, 255, 0.48);
  text-transform: uppercase;
}

.meta-item strong {
  display: block;
  margin-top: 2px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.01em;
}

.meta-divider {
  width: 1px;
  height: 34px;
  background: rgba(255, 255, 255, 0.12);
}

/* ---------- 三张叠放截图 ---------- */
.hero-visual {
  position: relative;
}

.shot-stage {
  position: relative;
  width: 100%;
  max-width: 540px;
  margin-inline: auto;
  aspect-ratio: 1 / 1;
  perspective: 1300px;
}

.shot-stage::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 52%;
  width: 78%;
  aspect-ratio: 1;
  transform: translate(-50%, -50%);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(154, 140, 255, 0.34), transparent 66%);
  filter: blur(10px);
  pointer-events: none;
}

.stage-badge {
  position: absolute;
  top: 3%;
  right: 0;
  z-index: 8;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 7px 14px;
  border-radius: 999px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.9);
  background: rgba(26, 18, 60, 0.68);
  border: 1px solid rgba(255, 255, 255, 0.18);
  backdrop-filter: blur(10px);
}

.stage-badge svg {
  color: var(--gold);
}

.shot {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 43%;
  cursor: pointer;
  transition: transform 0.55s var(--ease), filter 0.4s var(--ease),
    opacity 0.4s var(--ease);
  transform-style: preserve-3d;
  will-change: transform;
}

.shot-1 {
  transform: translate(-93%, -48%) rotate(-9deg) scale(0.9);
  z-index: 1;
}

.shot-2 {
  transform: translate(-50%, -52%) scale(1);
  z-index: 3;
}

.shot-3 {
  transform: translate(-7%, -48%) rotate(9deg) scale(0.9);
  z-index: 2;
}

.shot-frame {
  position: relative;
  aspect-ratio: 9 / 19;
  padding: 5px;
  border-radius: 28px;
  background: linear-gradient(160deg, #2c2158, #0d0724 70%);
  box-shadow: 0 34px 64px -20px rgba(4, 2, 18, 0.8),
    0 0 0 1px rgba(255, 255, 255, 0.18) inset;
}

.shot-frame::after {
  content: "";
  position: absolute;
  top: 11px;
  left: 50%;
  transform: translateX(-50%);
  width: 30%;
  height: 4px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.22);
  z-index: 3;
  pointer-events: none;
}

.shot-screen {
  position: absolute;
  inset: 5px;
  border-radius: 23px;
  overflow: hidden;
  background: linear-gradient(170deg, #f7f4ff, #e2d9ff);
}

.shot-ph {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 14px;
  color: #6c5ce7;
  opacity: 0.6;
}

.shot-ph-arc {
  width: 62px;
  height: 62px;
  border-radius: 50%;
  border: 7px solid rgba(108, 92, 231, 0.45);
  border-right-color: transparent;
  border-top-color: rgba(246, 185, 74, 0.85);
  transform: rotate(-24deg);
}

.shot-ph-text {
  font-size: 12px;
  letter-spacing: 0.2em;
}

.shot-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.shot-img[src=""] {
  opacity: 0;
}

.stage-hint {
  margin-top: 6px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.4);
}

/* 鼠标悬停 / 触屏激活 */
.shot-1.is-active,
.shot-1:hover {
  transform: translate(-97%, -58%) rotate(-3deg) scale(1.02);
  z-index: 6;
}

.shot-2.is-active,
.shot-2:hover {
  transform: translate(-50%, -58%) scale(1.06);
  z-index: 6;
}

.shot-3.is-active,
.shot-3:hover {
  transform: translate(-3%, -58%) rotate(3deg) scale(1.02);
  z-index: 6;
}

@media (hover: hover) {
  .shot-stage:hover .shot:not(:hover) {
    filter: brightness(0.68) saturate(0.8);
  }
}

/* ================= 产品介绍 ================= */
.intro {
  background:
    radial-gradient(560px 420px at 88% 0%, rgba(108, 92, 231, 0.08), transparent 66%),
    var(--bg);
}

.intro-grid {
  display: grid;
  grid-template-columns: 1.12fr 0.88fr;
  gap: 60px;
  align-items: center;
}

.intro-copy h2 {
  font-size: clamp(26px, 3.2vw, 38px);
  line-height: 1.36;
  letter-spacing: -0.015em;
  font-weight: 700;
}

.intro-copy p {
  margin-top: 20px;
  color: var(--muted);
  font-size: 15.5px;
  line-height: 1.95;
}

.intro-facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin-top: 36px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.fact span {
  display: block;
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.fact strong {
  display: block;
  margin-top: 4px;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.intro-card {
  position: relative;
  padding: 36px 32px;
  border-radius: 26px;
  background: linear-gradient(160deg, #ffffff, #f6f2ff);
  border: 1px solid rgba(108, 92, 231, 0.16);
  box-shadow: 0 30px 70px -40px rgba(76, 58, 190, 0.55);
  overflow: hidden;
}

.intro-card::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(246, 185, 74, 0.3), transparent 68%);
  pointer-events: none;
}

.intro-card-logo {
  position: relative;
  width: 66px;
  height: 66px;
  border-radius: 18px;
  overflow: hidden;
  background: radial-gradient(circle at 72% 22%, var(--gold) 0 5px, transparent 6px),
    linear-gradient(145deg, #8b7cf6, #5a47e0);
  box-shadow: 0 16px 30px -14px rgba(90, 71, 224, 0.9);
}

.intro-quote {
  position: relative;
  margin-top: 24px;
  font-size: 17.5px;
  line-height: 1.75;
  font-weight: 600;
  color: var(--ink);
}

.intro-list {
  margin-top: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.intro-list li {
  display: flex;
  gap: 12px;
  font-size: 14px;
  color: var(--ink-2);
  line-height: 1.75;
}

.intro-list span {
  flex: none;
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 700;
  font-size: 13px;
  color: var(--brand);
  letter-spacing: 0.04em;
  padding-top: 2px;
}

.intro-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 26px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--brand-strong);
  transition: gap 0.25s var(--ease), color 0.25s var(--ease);
}

.intro-link:hover {
  gap: 12px;
  color: var(--brand);
}

/* ================= 功能亮点 ================= */
.features {
  background: #ffffff;
}

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

.feature-card {
  position: relative;
  padding: 32px 28px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid var(--line);
  box-shadow: var(--shadow-card);
  overflow: hidden;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease),
    box-shadow 0.35s var(--ease);
}

.feature-card::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -80px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(108, 92, 231, 0.13), transparent 70%);
  opacity: 0;
  transition: opacity 0.4s var(--ease);
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-6px);
  border-color: rgba(108, 92, 231, 0.3);
  box-shadow: 0 26px 54px -30px rgba(76, 58, 190, 0.55);
}

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

.feature-num {
  position: absolute;
  top: 24px;
  right: 26px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 26px;
  font-weight: 700;
  color: rgba(108, 92, 231, 0.14);
  letter-spacing: 0.02em;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border-radius: 16px;
  color: var(--brand-strong);
  background: linear-gradient(150deg, #f1edff, #e2dbff);
  margin-bottom: 22px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.5;
  margin-bottom: 10px;
}

.feature-card p {
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--muted);
}

/* ================= 用户评价 ================= */
.reviews {
  position: relative;
  background: linear-gradient(180deg, #f7f5ff, #f0ecff);
}

.review-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
}

.review-card {
  position: relative;
  padding: 32px 30px;
  border-radius: var(--radius);
  background: #fff;
  border: 1px solid rgba(108, 92, 231, 0.12);
  box-shadow: 0 20px 50px -38px rgba(76, 58, 190, 0.5);
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}

.review-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 30px 60px -36px rgba(76, 58, 190, 0.55);
}

.review-quote {
  position: absolute;
  top: 12px;
  right: 26px;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 60px;
  line-height: 1;
  color: rgba(108, 92, 231, 0.14);
  pointer-events: none;
}

.stars {
  font-size: 13px;
  letter-spacing: 3px;
  color: var(--gold);
}

.review-text {
  margin: 14px 0 24px;
  font-size: 15px;
  line-height: 1.95;
  color: var(--ink-2);
}

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

.avatar {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  border-radius: 50%;
  font-size: 17px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(140deg, #8b7cf6, #5a47e0);
  box-shadow: 0 8px 18px -10px rgba(90, 71, 224, 0.9);
}

.review-card:nth-child(even) .avatar {
  background: linear-gradient(140deg, #f7c86d, #eaa32e);
  box-shadow: 0 8px 18px -10px rgba(234, 163, 46, 0.9);
}

.review-name {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.5;
}

.review-role {
  font-size: 12.5px;
  color: var(--muted);
  line-height: 1.6;
}

/* ================= 常见问题 ================= */
.faq {
  background: var(--bg);
}

.faq-wrap {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
  align-items: start;
}

.faq-left {
  position: sticky;
  top: 108px;
}

.faq-left h2 {
  font-size: clamp(26px, 3vw, 36px);
  line-height: 1.38;
  letter-spacing: -0.015em;
  font-weight: 700;
}

.faq-left > p {
  margin-top: 18px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--muted);
}

.faq-tip {
  margin-top: 30px;
  padding: 20px 22px;
  border-radius: 18px;
  background: linear-gradient(150deg, #f4f0ff, #fffaf0);
  border: 1px solid rgba(108, 92, 231, 0.14);
}

.faq-tip-label {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: #7a5a12;
  background: rgba(246, 185, 74, 0.24);
}

.faq-tip p {
  margin-top: 10px;
  font-size: 13.5px;
  line-height: 1.8;
  color: var(--ink-2);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.faq-item {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.faq-item.is-open {
  border-color: rgba(108, 92, 231, 0.35);
  box-shadow: 0 20px 44px -34px rgba(76, 58, 190, 0.6);
}

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 20px 22px;
  text-align: left;
  font-size: 15.5px;
  font-weight: 600;
  line-height: 1.6;
  transition: color 0.25s var(--ease);
}

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

.faq-icon {
  position: relative;
  width: 20px;
  height: 20px;
  flex: none;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  border-radius: 2px;
  background: var(--brand-strong);
  transform: translate(-50%, -50%);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}

.faq-icon::before {
  width: 12px;
  height: 2px;
}

.faq-icon::after {
  width: 2px;
  height: 12px;
}

.faq-item.is-open .faq-icon::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.faq-a {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.38s var(--ease);
}

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

.faq-a-inner {
  overflow: hidden;
}

.faq-a p {
  padding: 0 22px 22px;
  font-size: 14.5px;
  line-height: 1.95;
  color: var(--muted);
}

/* ================= 下载 ================= */
.download {
  padding-top: 40px;
  background: var(--bg);
}

.download-panel {
  position: relative;
  display: grid;
  grid-template-columns: 1.08fr 0.92fr;
  gap: 56px;
  align-items: center;
  padding: 68px 60px;
  border-radius: 34px;
  overflow: hidden;
  color: #fff;
  background:
    radial-gradient(640px 420px at 90% 10%, rgba(154, 140, 255, 0.45), transparent 62%),
    radial-gradient(480px 360px at 4% 98%, rgba(246, 185, 74, 0.22), transparent 62%),
    linear-gradient(140deg, #1a1142 0%, #2a1b63 55%, #3b2a8c 100%);
  box-shadow: 0 50px 90px -50px rgba(42, 27, 99, 0.8);
}

.download-panel::before {
  content: "";
  position: absolute;
  right: -140px;
  top: -160px;
  width: 480px;
  height: 480px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

.download-panel::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -80px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  border: 1px solid rgba(255, 255, 255, 0.08);
  pointer-events: none;
}

.dl-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(70px);
  pointer-events: none;
}

.dl-orb-1 {
  width: 260px;
  height: 260px;
  right: 20%;
  bottom: -140px;
  background: rgba(246, 185, 74, 0.22);
}

.dl-orb-2 {
  width: 220px;
  height: 220px;
  left: -80px;
  top: -80px;
  background: rgba(154, 140, 255, 0.35);
}

.dl-copy {
  position: relative;
  z-index: 1;
}

.dl-eyebrow {
  display: inline-block;
  font-size: 12.5px;
  letter-spacing: 0.2em;
  color: var(--gold-light);
  text-transform: uppercase;
  margin-bottom: 16px;
}

.dl-copy h2 {
  font-size: clamp(30px, 3.6vw, 44px);
  line-height: 1.25;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.dl-copy > p {
  max-width: 420px;
  margin-top: 16px;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.68);
}

.version-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 13px;
  color: #fff;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.14);
  backdrop-filter: blur(6px);
}

.chip em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.5);
}

.dl-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.dl-app {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  margin-bottom: 2px;
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.dl-app-icon {
  width: 48px;
  height: 48px;
  flex: none;
  border-radius: 14px;
  overflow: hidden;
  background: radial-gradient(circle at 72% 22%, var(--gold) 0 4px, transparent 5px),
    linear-gradient(145deg, #8b7cf6, #5a47e0);
}

.dl-app-text strong {
  display: block;
  font-size: 15.5px;
  letter-spacing: 0.02em;
}

.dl-app-text span {
  display: block;
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.5);
}

.dl-btn {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 17px 22px;
  border-radius: 18px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease),
    background 0.3s var(--ease), border-color 0.3s var(--ease);
}

.dl-btn--primary {
  color: #1b1244;
  background: #fff;
  box-shadow: 0 22px 44px -22px rgba(0, 0, 0, 0.7);
}

.dl-btn--primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 30px 54px -22px rgba(0, 0, 0, 0.8);
}

.dl-btn--ios {
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.26);
  backdrop-filter: blur(8px);
}

.dl-btn--ios:hover {
  transform: translateY(-3px);
  background: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.42);
}

.dl-icon {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex: none;
  border-radius: 14px;
}

.dl-btn--primary .dl-icon--android {
  color: #fff;
  background: linear-gradient(140deg, #8b7cf6, #5a47e0);
}

.dl-btn--ios .dl-icon--ios {
  color: #fff;
  background: rgba(255, 255, 255, 0.12);
}

.dl-btn-text {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.dl-btn-text small {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  opacity: 0.55;
}

.dl-btn-text strong {
  font-size: 17px;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.dl-arrow {
  margin-left: auto;
  opacity: 0.4;
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.dl-btn:hover .dl-arrow {
  opacity: 1;
  transform: translateX(4px);
}

.dl-note {
  margin-top: 2px;
  text-align: center;
  font-size: 12px;
  letter-spacing: 0.02em;
  color: rgba(255, 255, 255, 0.42);
}

/* ================= 页脚 ================= */
.site-footer {
  background: var(--dark-900);
  color: rgba(255, 255, 255, 0.62);
  padding: 66px 0 28px;
}

.footer-top {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1.1fr;
  gap: 44px;
}

.footer-brand .brand {
  margin-bottom: 18px;
}

.footer-brand p {
  max-width: 300px;
  font-size: 13.5px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.5);
}

.footer-dl {
  display: inline-flex;
  align-items: center;
  margin-top: 18px;
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 13px;
  font-weight: 600;
  color: #2b1c05;
  background: linear-gradient(135deg, #ffe3a6, var(--gold));
  transition: transform 0.25s var(--ease);
}

.footer-dl:hover {
  transform: translateY(-2px);
}

.footer-title {
  font-size: 13.5px;
  font-weight: 600;
  color: #fff;
  letter-spacing: 0.04em;
  margin-bottom: 16px;
}

.footer-links a {
  display: block;
  padding: 6px 0;
  font-size: 13.5px;
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.footer-links a:hover {
  color: var(--gold-light);
  transform: translateX(3px);
}

.footer-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-info li {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  font-size: 13px;
}

.footer-info span {
  color: rgba(255, 255, 255, 0.42);
  flex: none;
}

.footer-info strong {
  font-weight: 500;
  color: rgba(255, 255, 255, 0.82);
  text-align: right;
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 12.5px;
  color: rgba(255, 255, 255, 0.38);
}

/* ================= 滚动进入动画 ================= */
@keyframes reveal-up {
  from {
    opacity: 0;
    transform: translateY(26px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

/* 默认可见，仅在进入视口时播放入场动画，避免脚本异常导致内容不可见 */
.js .reveal.is-visible {
  animation: reveal-up 0.7s var(--ease) backwards;
}

.js .feature-grid .reveal:nth-child(2),
.js .review-grid .reveal:nth-child(2) {
  animation-delay: 0.08s;
}

.js .feature-grid .reveal:nth-child(3),
.js .review-grid .reveal:nth-child(3) {
  animation-delay: 0.16s;
}

.js .feature-grid .reveal:nth-child(5),
.js .review-grid .reveal:nth-child(4) {
  animation-delay: 0.08s;
}

.js .feature-grid .reveal:nth-child(6) {
  animation-delay: 0.16s;
}

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

  .js .feature-grid .reveal:nth-child(2n) {
    animation-delay: 0.08s;
  }

  .js .feature-grid .reveal:nth-child(3),
  .js .feature-grid .reveal:nth-child(5) {
    animation-delay: 0s;
  }

  .faq-wrap {
    gap: 44px;
  }
}

@media (max-width: 980px) {
  .hero {
    min-height: auto;
    padding: 132px 0 88px;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 56px;
  }

  .hero-copy {
    max-width: 640px;
  }

  .shot-stage {
    max-width: 460px;
  }

  .intro-grid {
    grid-template-columns: 1fr;
    gap: 44px;
  }

  .intro-copy {
    max-width: 660px;
  }

  .intro-card {
    max-width: 560px;
  }

  .faq-wrap {
    grid-template-columns: 1fr;
    gap: 40px;
  }

  .faq-left {
    position: static;
  }

  .download-panel {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 52px 40px;
  }

  .dl-copy > p {
    max-width: none;
  }

  .dl-actions {
    max-width: 440px;
  }

  .footer-top {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
  }

  .footer-brand {
    grid-column: 1 / -1;
  }
}

@media (max-width: 860px) {
  .site-nav {
    position: fixed;
    top: 70px;
    left: 4vw;
    right: 4vw;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 12px;
    border-radius: 18px;
    background: rgba(15, 9, 38, 0.97);
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 30px 60px rgba(0, 0, 0, 0.45);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    opacity: 0;
    transform: translateY(-12px);
    pointer-events: none;
    transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
  }

  .site-nav.is-open {
    opacity: 1;
    transform: none;
    pointer-events: auto;
  }

  .nav-link {
    padding: 13px 16px;
    border-radius: 12px;
    font-size: 15px;
  }

  .nav-download {
    margin: 6px 0 0;
    text-align: center;
    padding: 13px 16px;
  }

  .nav-toggle {
    display: inline-flex;
  }

  .section {
    padding: 84px 0;
  }

  .section-head {
    margin-bottom: 44px;
  }
}

@media (max-width: 720px) {
  .hero h1 {
    font-size: clamp(32px, 8vw, 42px);
  }

  .hero-desc {
    font-size: 15.5px;
  }

  .hero-actions .btn {
    flex: 1 1 auto;
    padding: 14px 24px;
  }

  .hero-meta {
    gap: 18px;
  }

  .meta-divider {
    display: none;
  }

  .meta-item {
    flex: 1 1 30%;
  }

  .shot-stage {
    max-width: 360px;
  }

  .shot-frame {
    border-radius: 22px;
    padding: 4px;
  }

  .shot-screen {
    inset: 4px;
    border-radius: 19px;
  }

  .shot-ph-arc {
    width: 44px;
    height: 44px;
    border-width: 5px;
  }

  .shot-ph-text {
    font-size: 10.5px;
  }

  .stage-badge {
    top: 1%;
    right: -2%;
    padding: 6px 11px;
    font-size: 11px;
  }

  .feature-grid,
  .review-grid {
    grid-template-columns: 1fr;
  }

  .js .feature-grid .reveal,
  .js .review-grid .reveal {
    animation-delay: 0s !important;
  }

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

  .download-panel {
    padding: 40px 24px;
    border-radius: 26px;
  }

  .download-panel::before,
  .download-panel::after {
    display: none;
  }

  .dl-actions {
    max-width: none;
  }

  .footer-top {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .footer-bottom {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 116px 0 72px;
  }

  .eyebrow-pill {
    font-size: 11.5px;
    letter-spacing: 0.04em;
  }

  .hero-tags li {
    font-size: 12px;
  }

  .shot-stage {
    max-width: 300px;
  }

  .stage-hint {
    font-size: 11px;
  }

  .intro-card {
    padding: 28px 22px;
  }

  .faq-q {
    padding: 17px 18px;
    font-size: 14.5px;
  }

  .faq-a p {
    padding: 0 18px 18px;
    font-size: 13.5px;
  }

  .dl-btn {
    padding: 14px 16px;
    gap: 12px;
  }

  .dl-btn-text strong {
    font-size: 16px;
  }

  .dl-icon {
    width: 42px;
    height: 42px;
  }

  .chip {
    font-size: 12px;
    padding: 7px 12px;
  }
}

/* ================= 动效降级 ================= */
@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

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