/* ==========================================================================
   冷眸软件库 · Landing Page
   主色取自 Logo 薄荷青绿 #2de4be
   ========================================================================== */

:root {
  --mint: #2de4be;
  --mint-light: #7df6df;
  --mint-dark: #12b596;
  --ink: #060e10;
  --ink-soft: #081618;
  --surface: rgba(15, 33, 34, 0.66);
  --surface-strong: rgba(13, 29, 30, 0.92);
  --line: rgba(115, 240, 214, 0.14);
  --line-strong: rgba(115, 240, 214, 0.3);
  --text: #e9f7f3;
  --muted: #8ea9a4;
  --mint-glow: rgba(45, 228, 190, 0.22);
  --radius: 22px;
  --header-h: 78px;
  --container: 1180px;
  --ease: cubic-bezier(0.22, 0.8, 0.25, 1);
  --font-sans: "PingFang SC", "HarmonyOS Sans SC", "Source Han Sans SC",
    "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
}

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

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

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background:
    radial-gradient(1000px 560px at 10% -10%, rgba(45, 228, 190, 0.16), transparent 62%),
    radial-gradient(820px 540px at 96% 4%, rgba(16, 122, 118, 0.22), transparent 66%),
    linear-gradient(180deg, #071214 0%, #060e10 46%, #050b0c 100%);
  background-attachment: fixed;
  overflow-x: hidden;
}

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

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

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

h1, h2, h3, h4, p, figure, ul {
  margin: 0;
}

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

::selection {
  background: rgba(45, 228, 190, 0.3);
  color: #fff;
}

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

/* 背景网格 */
.bg-grid {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(125, 246, 223, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 246, 223, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 10%, transparent 78%);
  mask-image: radial-gradient(ellipse 90% 60% at 50% 0%, #000 10%, transparent 78%);
}

main,
.site-header,
.site-footer {
  position: relative;
  z-index: 1;
}

.skip-link {
  position: fixed;
  top: -100px;
  left: 24px;
  z-index: 100;
  padding: 10px 18px;
  border-radius: 999px;
  background: var(--mint);
  color: #04110f;
  font-weight: 700;
  transition: top 0.25s;
}

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

/* ==========================================================================
   Header
   ========================================================================== */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  transition: background 0.35s, border-color 0.35s, backdrop-filter 0.35s;
  border-bottom: 1px solid transparent;
}

.site-header.is-scrolled {
  background: rgba(6, 14, 16, 0.78);
  border-bottom-color: var(--line);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-h);
  gap: 24px;
}

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

.brand-logo {
  width: 42px;
  height: 42px;
  border-radius: 13px;
  object-fit: contain;
  background:
    radial-gradient(circle at 30% 20%, rgba(45, 228, 190, 0.24), rgba(45, 228, 190, 0.05) 70%),
    rgba(9, 22, 23, 0.9);
  border: 1px solid rgba(125, 246, 223, 0.22);
  box-shadow: 0 0 22px rgba(45, 228, 190, 0.14);
}

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

.brand-text strong {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.brand-text small {
  margin-top: 4px;
  font-size: 9px;
  letter-spacing: 0.26em;
  color: var(--muted);
}

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

.nav-link {
  padding: 9px 15px;
  border-radius: 999px;
  font-size: 14px;
  color: var(--muted);
  transition: color 0.25s, background 0.25s;
}

.nav-link:hover {
  color: var(--text);
  background: rgba(255, 255, 255, 0.04);
}

.nav-link.is-active {
  color: var(--mint);
  background: rgba(45, 228, 190, 0.08);
}

.nav-download {
  margin-left: 14px;
  padding: 10px 21px;
  border-radius: 999px;
  border: 1px solid rgba(45, 228, 190, 0.35);
  color: var(--mint);
  font-size: 14px;
  font-weight: 600;
  transition: background 0.28s, color 0.28s, box-shadow 0.28s, transform 0.28s;
}

.nav-download:hover {
  background: var(--mint);
  color: #04110f;
  box-shadow: 0 10px 30px rgba(45, 228, 190, 0.28);
  transform: translateY(-1px);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0 11px;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: rgba(12, 28, 29, 0.7);
}

.nav-toggle span {
  display: block;
  height: 1.6px;
  border-radius: 2px;
  background: var(--text);
  transition: transform 0.3s var(--ease), opacity 0.2s;
}

.nav-toggle.is-open span:nth-child(1) {
  transform: translateY(6.6px) rotate(45deg);
}

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

.nav-toggle.is-open span:nth-child(3) {
  transform: translateY(-6.6px) rotate(-45deg);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  position: relative;
  padding: calc(var(--header-h) + 70px) 0 110px;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -180px;
  left: 42%;
  width: 900px;
  height: 700px;
  background: radial-gradient(circle, rgba(45, 228, 190, 0.12), transparent 62%);
  pointer-events: none;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.02fr 0.98fr;
  align-items: center;
  gap: 40px;
}

.hero-grid > * {
  min-width: 0;
}

.hero-copy {
  position: relative;
  z-index: 2;
  width: 100%;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 8px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(45, 228, 190, 0.06);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: #bcd9d2;
}

.pulse-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 0 rgba(45, 228, 190, 0.5);
  animation: pulse 2.4s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(45, 228, 190, 0.45); }
  70% { box-shadow: 0 0 0 10px rgba(45, 228, 190, 0); }
  100% { box-shadow: 0 0 0 0 rgba(45, 228, 190, 0); }
}

.hero h1 {
  margin: 24px 0 22px;
  font-size: clamp(2.7rem, 5.4vw, 4.5rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.025em;
}

.text-gradient {
  background: linear-gradient(112deg, #a9fdec 0%, #2de4be 45%, #1fc6c0 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  filter: drop-shadow(0 0 26px rgba(45, 228, 190, 0.32));
}

.hero-lead {
  max-width: 545px;
  font-size: 16.5px;
  line-height: 1.85;
  color: #a8c3bd;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 34px 0 32px;
}

.meta-card {
  flex: 1 1 138px;
  min-width: 132px;
  padding: 13px 16px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(17, 39, 39, 0.72), rgba(8, 19, 20, 0.62));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.meta-label {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.12em;
  color: var(--muted);
  text-transform: uppercase;
}

.meta-value {
  display: block;
  margin-top: 5px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
  font-variant-numeric: tabular-nums;
}

.meta-value.is-mint {
  color: var(--mint);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 14px 28px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 600;
  transition: transform 0.3s var(--ease), box-shadow 0.3s, background 0.3s, border-color 0.3s;
}

.btn svg {
  width: 18px;
  height: 18px;
}

.btn-primary {
  color: #04110f;
  background: linear-gradient(120deg, #8bf8e4, #2de4be 52%, #19c8ab);
  box-shadow: 0 14px 38px rgba(45, 228, 190, 0.28), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 20px 46px rgba(45, 228, 190, 0.36), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.btn-ghost {
  border: 1px solid var(--line-strong);
  color: #cfe7e1;
  background: rgba(255, 255, 255, 0.02);
}

.btn-ghost:hover {
  border-color: rgba(45, 228, 190, 0.55);
  color: var(--mint);
  background: rgba(45, 228, 190, 0.06);
  transform: translateY(-3px);
}

.trust-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin-top: 28px;
  font-size: 12.5px;
  color: var(--muted);
}

.trust-row li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.trust-row svg {
  width: 14px;
  height: 14px;
  color: var(--mint);
  flex-shrink: 0;
}

/* --- 首屏截图叠层 --- */

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 640px;
  min-width: 0;
}

.glow-orb {
  position: absolute;
  width: 440px;
  height: 440px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 228, 190, 0.2), rgba(45, 228, 190, 0.04) 55%, transparent 70%);
  filter: blur(28px);
  animation: breathe 7s ease-in-out infinite;
}

@keyframes breathe {
  0%, 100% { transform: scale(1); opacity: 0.85; }
  50% { transform: scale(1.08); opacity: 1; }
}

.shots-stage {
  position: relative;
  width: 100%;
  max-width: 552px;
  min-width: 0;
  height: 616px;
}

.shot {
  position: absolute;
  width: 52%;
  padding: 9px;
  border-radius: 26px;
  background: linear-gradient(170deg, rgba(24, 52, 52, 0.94), rgba(7, 18, 19, 0.96));
  border: 1px solid rgba(125, 246, 223, 0.18);
  box-shadow: 0 30px 65px rgba(0, 0, 0, 0.55);
  transition: transform 0.5s var(--ease), opacity 0.4s, border-color 0.4s, box-shadow 0.4s;
  cursor: pointer;
  outline: none;
}

.shot-1 {
  left: 0;
  top: 56px;
  z-index: 1;
  transform: rotate(-8deg) translateY(8px);
}

.shot-2 {
  left: 24%;
  top: 0;
  z-index: 3;
}

.shot-3 {
  right: 0;
  top: 56px;
  z-index: 2;
  transform: rotate(8deg) translateY(8px);
}

.shot-screen {
  position: relative;
  aspect-ratio: 9 / 16;
  border-radius: 18px;
  overflow: hidden;
  background:
    radial-gradient(circle at 50% 0%, rgba(45, 228, 190, 0.2), transparent 56%),
    linear-gradient(180deg, #0d2424 0%, #081718 58%, #061112 100%);
  border: 1px solid rgba(255, 255, 255, 0.05);
}

/* 空图片时的界面骨架占位（填入真实截图后自动被覆盖） */
.shot-screen::before {
  content: "";
  position: absolute;
  inset: 9% 8%;
  z-index: 1;
  border-radius: 14px;
  background-color: transparent;
  background-image:
    linear-gradient(90deg, rgba(45, 228, 190, 0.3), rgba(45, 228, 190, 0.06)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08), rgba(255, 255, 255, 0.02)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.06), rgba(255, 255, 255, 0.02)),
    linear-gradient(90deg, rgba(45, 228, 190, 0.13), rgba(255, 255, 255, 0.02)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02)),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05), rgba(255, 255, 255, 0.02));
  background-repeat: no-repeat;
  background-size:
    38% 5%,
    100% 20%,
    48% 17%,
    48% 17%,
    100% 6%,
    100% 13%,
    100% 13%;
  background-position:
    0 0,
    0 12%,
    0 40%,
    100% 40%,
    0 62%,
    0 76%,
    0 95%;
  transition: opacity 0.4s;
}

.shot-screen::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(180deg, transparent 55%, rgba(3, 10, 10, 0.55));
  pointer-events: none;
}

.shot img {
  position: absolute;
  inset: 0;
  z-index: 2;
  width: 100%;
  height: 100%;
  object-fit: cover;
  background: transparent;
}

.shot.has-shot .shot-screen::before {
  opacity: 0;
}

.shot-index {
  position: absolute;
  top: 18px;
  left: 18px;
  z-index: 4;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: rgba(233, 247, 243, 0.55);
  background: rgba(4, 12, 13, 0.65);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 999px;
  padding: 3px 9px;
}

.shot figcaption {
  position: absolute;
  left: 50%;
  bottom: -16px;
  z-index: 5;
  transform: translateX(-50%);
  padding: 6px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(9, 22, 23, 0.94);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.35);
  font-size: 11.5px;
  color: #cfe8e2;
  white-space: nowrap;
}

.shot:hover,
.shot:focus-visible {
  transform: translateY(-18px) rotate(0deg) scale(1.045);
  z-index: 6;
  border-color: rgba(125, 246, 223, 0.5);
  box-shadow: 0 40px 90px rgba(0, 0, 0, 0.62), 0 0 60px rgba(45, 228, 190, 0.16);
}

@media (hover: hover) {
  .shots-stage:hover .shot:not(:hover) {
    opacity: 0.62;
    filter: saturate(0.8);
  }
}

.float-card {
  position: absolute;
  z-index: 8;
  padding: 11px 17px;
  border-radius: 14px;
  border: 1px solid var(--line-strong);
  background: rgba(8, 21, 22, 0.82);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.4);
  pointer-events: none;
}

.float-version {
  top: 17%;
  left: 0;
  display: flex;
  flex-direction: column;
  gap: 1px;
  animation: float-y 6s ease-in-out infinite;
}

.float-version span {
  font-size: 9.5px;
  letter-spacing: 0.14em;
  color: var(--muted);
  text-transform: uppercase;
}

.float-version strong {
  font-size: 17px;
  color: var(--mint);
  letter-spacing: 0.02em;
}

.float-safe {
  right: 0;
  bottom: 11%;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: #d6efe9;
  animation: float-y 7s ease-in-out infinite reverse;
}

.float-safe svg {
  width: 17px;
  height: 17px;
  color: var(--mint);
}

@keyframes float-y {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-9px); }
}

/* ==========================================================================
   Section 通用
   ========================================================================== */

.section {
  position: relative;
  padding: 110px 0;
  scroll-margin-top: 90px;
}

.section-head {
  max-width: 660px;
  margin: 0 auto 58px;
  text-align: center;
}

.overline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.24em;
  color: var(--mint);
  text-transform: uppercase;
}

.overline::before {
  content: "";
  width: 18px;
  height: 1px;
  background: currentColor;
  opacity: 0.5;
}

.section h2 {
  margin: 16px 0 16px;
  font-size: clamp(2rem, 3.6vw, 2.9rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.02em;
}

.section-sub {
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ==========================================================================
   Features
   ========================================================================== */

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

.feature-card {
  position: relative;
  padding: 30px 28px 32px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(19, 43, 43, 0.72), rgba(8, 19, 20, 0.72));
  overflow: hidden;
  transition: transform 0.45s var(--ease), border-color 0.35s, box-shadow 0.45s;
}

.feature-card::after {
  content: "";
  position: absolute;
  top: -70px;
  right: -70px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 228, 190, 0.18), transparent 68%);
  opacity: 0;
  transition: opacity 0.45s;
  pointer-events: none;
}

.feature-card:hover {
  transform: translateY(-7px);
  border-color: rgba(45, 228, 190, 0.38);
  box-shadow: 0 26px 55px rgba(0, 0, 0, 0.38);
}

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

.feature-num {
  position: absolute;
  top: 22px;
  right: 24px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: rgba(125, 246, 223, 0.28);
  font-variant-numeric: tabular-nums;
}

.feature-icon {
  display: grid;
  place-items: center;
  width: 48px;
  height: 48px;
  border-radius: 14px;
  border: 1px solid rgba(45, 228, 190, 0.2);
  background: linear-gradient(150deg, rgba(45, 228, 190, 0.16), rgba(45, 228, 190, 0.03));
  color: var(--mint);
  margin-bottom: 22px;
}

.feature-icon svg {
  width: 23px;
  height: 23px;
}

.feature-card h3 {
  margin-bottom: 10px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.feature-card p {
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ==========================================================================
   Reviews
   ========================================================================== */

.section-reviews {
  overflow: hidden;
}

.section-reviews::before {
  content: "";
  position: absolute;
  top: 20%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 460px;
  background: radial-gradient(ellipse, rgba(14, 110, 105, 0.18), transparent 68%);
  pointer-events: none;
}

.reviews-grid {
  position: relative;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.review-card {
  position: relative;
  padding: 30px 30px 26px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: linear-gradient(165deg, rgba(17, 38, 38, 0.72), rgba(8, 18, 19, 0.68));
  transition: transform 0.45s var(--ease), border-color 0.35s, box-shadow 0.45s;
  overflow: hidden;
}

.review-card::before {
  content: "\201C";
  position: absolute;
  top: 4px;
  right: 24px;
  font-family: Georgia, serif;
  font-size: 88px;
  line-height: 1;
  color: rgba(45, 228, 190, 0.12);
  pointer-events: none;
}

.review-card:hover {
  transform: translateY(-6px);
  border-color: rgba(45, 228, 190, 0.34);
  box-shadow: 0 24px 50px rgba(0, 0, 0, 0.36);
}

.review-stars {
  font-size: 14px;
  letter-spacing: 3px;
  color: var(--mint);
  margin-bottom: 14px;
}

.review-text {
  position: relative;
  font-size: 15.5px;
  line-height: 1.85;
  color: #d3e8e3;
  margin-bottom: 24px;
}

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

.avatar {
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  flex-shrink: 0;
  border-radius: 50%;
  font-size: 17px;
  font-weight: 700;
  color: #04110f;
  background: linear-gradient(135deg, #8bf8e4, #17b99b);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.45);
}

.review-card:nth-child(2) .avatar {
  background: linear-gradient(135deg, #a5f9da, #12a89c);
}

.review-card:nth-child(3) .avatar {
  background: linear-gradient(135deg, #6cece1, #0f9f95);
}

.review-card:nth-child(4) .avatar {
  background: linear-gradient(135deg, #b7fbe8, #22b3a2);
}

.review-user-info {
  display: flex;
  flex-direction: column;
  line-height: 1.4;
}

.review-user-info strong {
  font-size: 14.5px;
  font-weight: 700;
}

.review-user-info span {
  font-size: 12px;
  color: var(--muted);
}

/* ==========================================================================
   FAQ
   ========================================================================== */

#faq {
  padding-top: 40px;
}

.faq-grid {
  display: grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 70px;
  align-items: start;
}

.faq-aside {
  position: sticky;
  top: 118px;
}

.faq-aside h2 {
  margin: 16px 0 18px;
}

.help-card {
  margin-top: 30px;
  padding: 22px 24px;
  border-radius: 18px;
  border: 1px solid var(--line);
  background: linear-gradient(160deg, rgba(19, 43, 43, 0.7), rgba(8, 19, 20, 0.6));
}

.help-card strong {
  display: block;
  font-size: 14.5px;
  margin-bottom: 6px;
}

.help-card p {
  font-size: 13px;
  color: var(--muted);
  margin-bottom: 12px;
}

.help-card a {
  font-size: 13.5px;
  color: var(--mint);
  border-bottom: 1px solid rgba(45, 228, 190, 0.35);
  padding-bottom: 2px;
  transition: opacity 0.25s;
}

.help-card a:hover {
  opacity: 0.75;
}

.faq-list {
  border-top: 1px solid var(--line);
}

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

.faq-q {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  width: 100%;
  padding: 23px 2px;
  text-align: left;
  font-size: 16px;
  font-weight: 600;
  color: #dcefe9;
  transition: color 0.25s;
}

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

.faq-icon {
  position: relative;
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid var(--line-strong);
  transition: transform 0.35s var(--ease), background 0.3s, border-color 0.3s;
}

.faq-icon::before,
.faq-icon::after {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  background: currentColor;
  border-radius: 2px;
  transform: translate(-50%, -50%);
}

.faq-icon::before {
  width: 10px;
  height: 1.4px;
}

.faq-icon::after {
  width: 1.4px;
  height: 10px;
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
  border-color: var(--mint);
  background: rgba(45, 228, 190, 0.12);
  color: var(--mint);
}

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

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

.faq-a p {
  max-width: 640px;
  padding: 0 38px 24px 2px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

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

/* ==========================================================================
   Download
   ========================================================================== */

.section-download {
  padding: 40px 0 110px;
  scroll-margin-top: 90px;
}

.download-card {
  position: relative;
  padding: 80px 32px 64px;
  border-radius: 34px;
  border: 1px solid rgba(45, 228, 190, 0.22);
  background:
    radial-gradient(circle at 50% 0%, rgba(45, 228, 190, 0.16), transparent 58%),
    linear-gradient(180deg, rgba(14, 35, 35, 0.94), rgba(6, 15, 16, 0.98));
  box-shadow: 0 50px 120px rgba(0, 0, 0, 0.5);
  overflow: hidden;
  text-align: center;
}

.download-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(125, 246, 223, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(125, 246, 223, 0.05) 1px, transparent 1px);
  background-size: 46px 46px;
  -webkit-mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000, transparent 80%);
  mask-image: radial-gradient(ellipse 80% 70% at 50% 30%, #000, transparent 80%);
  pointer-events: none;
}

.download-orb {
  position: absolute;
  top: -220px;
  left: 50%;
  transform: translateX(-50%);
  width: 620px;
  height: 420px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(45, 228, 190, 0.22), transparent 65%);
  filter: blur(30px);
  pointer-events: none;
}

.download-inner {
  position: relative;
  z-index: 2;
}

.download-card h2 {
  font-size: clamp(2rem, 4vw, 3.1rem);
  margin: 18px 0 16px;
}

.download-sub {
  font-size: 15px;
  color: var(--muted);
}

.dl-meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin: 28px 0 34px;
}

.dl-chip {
  padding: 7px 15px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.025);
  font-size: 12px;
  color: #bfd8d2;
  font-variant-numeric: tabular-nums;
}

.download-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 14px;
}

.btn-download {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  min-width: 236px;
  padding: 19px 38px;
  border-radius: 999px;
  font-size: 17.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
  color: #04110f;
  background: linear-gradient(120deg, #8ef9e5, #2de4be 48%, #17c8a9);
  box-shadow: 0 20px 50px rgba(45, 228, 190, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.5);
  overflow: hidden;
  transition: transform 0.32s var(--ease), box-shadow 0.32s;
}

.btn-download svg {
  width: 21px;
  height: 21px;
}

.btn-download::after {
  content: "";
  position: absolute;
  top: 0;
  left: -130%;
  width: 55%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.55), transparent);
  transform: skewX(-22deg);
  animation: shine 3.8s ease-in-out infinite;
}

@keyframes shine {
  0% { left: -130%; }
  55% { left: 160%; }
  100% { left: 160%; }
}

.btn-download:hover {
  transform: translateY(-4px) scale(1.015);
  box-shadow: 0 28px 64px rgba(45, 228, 190, 0.42), inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.btn-download:active {
  transform: translateY(-1px) scale(1);
}

.btn-download--ios {
  color: #dff5ef;
  background: linear-gradient(150deg, rgba(30, 62, 60, 0.9), rgba(10, 24, 25, 0.92));
  border: 1px solid rgba(125, 246, 223, 0.36);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.08);
}

.btn-download--ios svg {
  color: var(--mint);
}

.btn-download--ios::after {
  display: none;
}

.btn-download--ios:hover {
  border-color: rgba(45, 228, 190, 0.6);
  background: linear-gradient(150deg, rgba(36, 78, 74, 0.95), rgba(12, 30, 30, 0.95));
  box-shadow: 0 20px 44px rgba(0, 0, 0, 0.34), 0 0 30px rgba(45, 228, 190, 0.12);
}

.btn-download--ios .btn-version {
  background: rgba(45, 228, 190, 0.14);
  color: var(--mint);
}

.btn-download.is-hinting {
  animation: hint 0.5s ease;
}

@keyframes hint {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.btn-version {
  padding: 3px 9px;
  border-radius: 999px;
  background: rgba(4, 17, 15, 0.16);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.download-note {
  margin-top: 18px;
  font-size: 12px;
  color: var(--muted);
}

.dl-steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  max-width: 720px;
  margin: 48px auto 0;
  padding-top: 34px;
  border-top: 1px solid var(--line);
}

.step {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 11px;
  font-size: 13px;
  color: #b9d3cd;
}

.step-num {
  display: grid;
  place-items: center;
  width: 30px;
  height: 30px;
  flex-shrink: 0;
  border-radius: 50%;
  border: 1px solid rgba(45, 228, 190, 0.32);
  color: var(--mint);
  font-size: 10.5px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  padding: 64px 0 26px;
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(5, 12, 13, 0.4), rgba(4, 10, 11, 0.9));
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.6fr 1fr 1fr;
  gap: 48px;
}

.footer-brand p {
  max-width: 340px;
  margin-top: 17px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.footer-col h4 {
  margin-bottom: 18px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: #c8ddd8;
  text-transform: uppercase;
}

.footer-col a,
.footer-col span {
  display: block;
  margin-bottom: 11px;
  font-size: 13px;
  color: var(--muted);
  transition: color 0.25s;
}

.footer-col a:hover {
  color: var(--mint);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 24px;
  margin-top: 48px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  color: rgba(142, 169, 164, 0.8);
}

/* ==========================================================================
   滚动显现
   ========================================================================== */

.reveal {
  opacity: 0;
  transform: translateY(26px);
  transition: opacity 0.75s var(--ease), transform 0.75s var(--ease);
  transition-delay: var(--reveal-delay, 0s);
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   响应式
   ========================================================================== */

@media (max-width: 1080px) {
  .hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.9rem);
  }

  .shots-stage {
    max-width: 500px;
    height: 584px;
  }

  .float-version {
    left: -1%;
  }

  .float-safe {
    right: -1%;
  }

  .faq-grid {
    gap: 48px;
  }
}

@media (max-width: 900px) {
  .nav-toggle {
    display: flex;
  }

  .nav {
    position: fixed;
    top: calc(var(--header-h) + 8px);
    left: 16px;
    right: 16px;
    z-index: 60;
    flex-direction: column;
    align-items: stretch;
    gap: 4px;
    padding: 16px;
    border-radius: 20px;
    border: 1px solid var(--line);
    background: rgba(8, 20, 21, 0.97);
    box-shadow: 0 30px 80px rgba(0, 0, 0, 0.65);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.28s, transform 0.28s var(--ease), visibility 0.28s;
  }

  .nav.is-open {
    opacity: 1;
    visibility: visible;
    transform: none;
  }

  .nav-link {
    padding: 13px 14px;
    font-size: 15px;
  }

  .nav-download {
    margin: 8px 0 0;
    padding: 13px;
    text-align: center;
  }

  .hero {
    padding-top: calc(var(--header-h) + 52px);
    padding-bottom: 80px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 58px;
  }

  .hero-copy {
    max-width: 720px;
  }

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

  .hero-visual {
    min-height: 0;
  }

  .glow-orb {
    width: 340px;
    height: 340px;
    top: 10%;
  }

  /* 移动端改为可横向滑动的截图列 */
  .shots-stage {
    display: flex;
    gap: 16px;
    max-width: 100%;
    height: auto;
    padding: 12px 4px 30px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: thin;
    scrollbar-color: rgba(45, 228, 190, 0.35) transparent;
  }

  .shots-stage::-webkit-scrollbar {
    height: 4px;
  }

  .shots-stage::-webkit-scrollbar-thumb {
    background: rgba(45, 228, 190, 0.35);
    border-radius: 4px;
  }

  .shot {
    position: relative;
    inset: auto;
    flex: 0 0 248px;
    width: 248px;
    transform: none;
    scroll-snap-align: center;
  }

  .shot-1, .shot-3 {
    top: auto;
    left: auto;
    right: auto;
    transform: none;
  }

  .shot:hover,
  .shot:focus-visible {
    transform: translateY(-6px);
  }

  .shot figcaption {
    bottom: 16px;
    background: rgba(6, 16, 17, 0.86);
    -webkit-backdrop-filter: blur(8px);
    backdrop-filter: blur(8px);
  }

  .float-card {
    display: none;
  }

  .section {
    padding: 84px 0;
  }

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

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

  .faq-aside {
    position: static;
  }

  .faq-aside .section-sub {
    max-width: 560px;
  }

  .help-card {
    max-width: 420px;
  }

  .footer-grid {
    grid-template-columns: 1.4fr 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 640px) {
  .container {
    width: calc(100% - 40px);
  }

  .header-inner {
    height: 70px;
  }

  :root {
    --header-h: 70px;
  }

  .brand-logo {
    width: 38px;
    height: 38px;
    border-radius: 11px;
  }

  .brand-text strong {
    font-size: 15.5px;
  }

  .hero {
    padding-top: calc(var(--header-h) + 42px);
    padding-bottom: 64px;
  }

  .eyebrow {
    padding: 7px 13px;
    font-size: 11.5px;
  }

  .hero h1 {
    font-size: clamp(2.35rem, 11vw, 3.1rem);
    margin: 20px 0 18px;
  }

  .hero-lead {
    font-size: 15px;
    line-height: 1.8;
  }

  .hero-meta {
    gap: 9px;
    margin: 28px 0;
  }

  .meta-card {
    flex: 1 1 calc(50% - 9px);
    min-width: 0;
    padding: 12px 14px;
  }

  .meta-value {
    font-size: 14.5px;
  }

  .hero-actions {
    gap: 10px;
  }

  .btn {
    padding: 13px 22px;
    font-size: 14px;
  }

  .trust-row {
    gap: 8px 16px;
    font-size: 12px;
  }

  .shots-stage {
    gap: 13px;
  }

  .shot {
    flex: 0 0 222px;
    width: 222px;
    padding: 7px;
    border-radius: 22px;
  }

  .shot-screen {
    border-radius: 15px;
  }

  .shot figcaption {
    bottom: 12px;
    padding: 5px 13px;
    font-size: 11px;
  }

  .section {
    padding: 70px 0;
  }

  .section h2 {
    font-size: clamp(1.75rem, 7.5vw, 2.2rem);
  }

  .features-grid,
  .reviews-grid {
    grid-template-columns: 1fr;
    gap: 14px;
  }

  .feature-card {
    padding: 26px 22px 28px;
  }

  .feature-icon {
    margin-bottom: 18px;
  }

  .review-card {
    padding: 26px 22px 22px;
  }

  .faq-q {
    padding: 19px 0;
    font-size: 14.5px;
    gap: 14px;
  }

  .faq-a p {
    padding-right: 22px;
    font-size: 13.5px;
  }

  .section-download {
    padding: 20px 0 76px;
  }

  .download-card {
    padding: 52px 20px 42px;
    border-radius: 26px;
  }

  .download-sub {
    font-size: 13.5px;
    line-height: 1.8;
  }

  .dl-meta {
    margin: 24px 0 28px;
    gap: 8px;
  }

  .dl-chip {
    padding: 6px 12px;
    font-size: 11px;
  }

  .btn-download {
    width: 100%;
    padding: 17px 22px;
    font-size: 16px;
    gap: 9px;
  }

  .btn-version {
    font-size: 10px;
  }

  .dl-steps {
    grid-template-columns: 1fr;
    gap: 12px;
    margin-top: 34px;
    padding-top: 24px;
  }

  .step {
    justify-content: flex-start;
    max-width: 250px;
    margin-inline: auto;
  }

  .step-num {
    width: 28px;
    height: 28px;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
    margin-top: 36px;
  }

  .site-footer {
    padding-top: 48px;
  }
}

@media (max-width: 380px) {
  .shot {
    flex: 0 0 204px;
    width: 204px;
  }

  .btn-download {
    flex-wrap: wrap;
  }
}

/* ==========================================================================
   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;
  }
}