@charset "UTF-8";
/* ==========================================================================
   会聊官网 · 组件与动效样式 v2（炫酷增强版）
   包含：滚动进度、鼠标跟随、字符入场、stagger 卡片、blob 背景、玻璃态、
        渐变文字流光、磁吸按钮、霓虹微光、滚动视差
   ========================================================================== */

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; padding: 0; }

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 16px);
}

body {
  font-family: var(--font-sans);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  color: var(--n-700);
  background: var(--n-0);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  cursor: default;
}

img, svg { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
ul, ol { list-style: none; }

h1, h2, h3, h4 {
  color: var(--n-900);
  line-height: var(--lh-tight);
  font-weight: 700;
  text-wrap: balance;
}
h1 { font-size: var(--fs-h1); font-weight: 800; letter-spacing: -.5px; }
h2 { font-size: var(--fs-h2); }
h3 { font-size: var(--fs-h3); font-weight: 600; }

/* ==========================================================================
   顶部滚动进度条
   ========================================================================== */
.scroll-progress {
  position: fixed;
  top: 0; left: 0;
  width: calc(var(--scroll, 0) * 100%);
  height: 3px;
  background: var(--grad-rainbow);
  background-size: 200% 100%;
  animation: rain 6s linear infinite;
  z-index: 200;
  transition: width 80ms linear;
  pointer-events: none;
}
@keyframes rain { from { background-position: 0 0; } to { background-position: 200% 0; } }

/* ==========================================================================
   鼠标跟随光圈（PC）
   ========================================================================== */
.cursor-follower {
  position: fixed;
  top: 0; left: 0;
  width: 28px; height: 28px;
  border: 2px solid var(--brand-500);
  border-radius: 50%;
  pointer-events: none;
  z-index: 199;
  mix-blend-mode: difference;
  transform: translate(-50%, -50%);
  transition: width .2s var(--ease), height .2s var(--ease), border-color .2s var(--ease), opacity .2s var(--ease);
  opacity: 0;
}
.cursor-follower.is-visible { opacity: .85; }
.cursor-follower.is-hover {
  width: 56px; height: 56px;
  border-color: var(--accent-warm);
  background: rgba(255, 122, 60, .08);
  mix-blend-mode: normal;
}
@media (hover: none), (pointer: coarse) {
  .cursor-follower { display: none; }
}

/* ==========================================================================
   焦点 + 跳转链接
   ========================================================================== */
:focus-visible {
  outline: 3px solid var(--brand-500);
  outline-offset: 3px;
  border-radius: 6px;
}
.skip-link {
  position: fixed;
  top: 8px; left: 8px;
  z-index: 999;
  padding: 12px 20px;
  background: var(--n-900);
  color: var(--n-0);
  border-radius: var(--r-pill);
  transform: translateY(-200%);
  transition: transform var(--dur-fast) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ==========================================================================
   容器 / 区块
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-block: var(--s-8); position: relative; }
.section--tight { padding-block: var(--s-6); }
.section--tint { background: var(--n-50); }
.section--dark { background: var(--n-950); color: rgba(255,255,255,.84); }
.section--dark h1, .section--dark h2, .section--dark h3 { color: var(--n-0); }

@media (min-width: 768px) { .section { padding-block: var(--s-10); } }
@media (min-width: 992px) { .section { padding-block: var(--s-12); } }

.section__head { max-width: 720px; margin-bottom: var(--s-5); }
.section__head--center { margin-inline: auto; text-align: center; }
.section__eyebrow {
  display: inline-block;
  margin-bottom: var(--s-2);
  padding: 6px 14px;
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-100);
  border-radius: var(--r-pill);
}
.section--dark .section__eyebrow { background: rgba(255,255,255,.08); color: var(--brand-300); }
.section__title { margin-bottom: var(--s-2); }
.section__desc { font-size: var(--fs-lead); color: var(--n-500); }
.section--dark .section__desc { color: rgba(255,255,255,.7); }

/* ==========================================================================
   渐变流光标题
   ========================================================================== */
.text-gradient {
  background: var(--grad-brand);
  background-size: 200% 200%;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradient-shift 6s ease-in-out infinite;
}
@keyframes gradient-shift {
  0%, 100% { background-position: 0% 50%; }
  50%      { background-position: 100% 50%; }
}

/* ==========================================================================
   字符入场（由 main.js 拆字）
   ========================================================================== */
.chars > .char {
  display: inline-block;
  opacity: 0;
  transform: translateY(.6em) rotate(.06turn);
  transition: opacity .5s var(--ease-out), transform .5s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 28ms);
}
.chars.is-visible > .char { opacity: 1; transform: none; }

/* 字符 mask 扫过效果 */
.chars-mask > .char {
  display: inline-block;
  transform: translateY(110%);
  transition: transform .8s var(--ease-out);
  transition-delay: calc(var(--i, 0) * 28ms);
}
.chars-mask.is-visible > .char { transform: translateY(0); }

/* ==========================================================================
   通用进场（fade-up + stagger）
   ========================================================================== */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity .8s var(--ease-out), transform .8s var(--ease-out);
  transition-delay: calc(var(--i, 0) * var(--dur-stagger));
}
.reveal.is-visible { opacity: 1; transform: none; }

/* ==========================================================================
   按钮（磁吸 + 光斑 + 浮动）
   ========================================================================== */
.btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 48px;
  padding: 12px 24px;
  font-size: var(--fs-btn);
  font-weight: 600;
  border-radius: var(--r-pill);
  border: 2px solid transparent;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
  transition: transform var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease),
              background-color var(--dur-fast) var(--ease),
              color var(--dur-fast) var(--ease);
  will-change: transform;
}
.btn::before {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(circle at var(--mx, 50%) var(--my, 50%), rgba(255,255,255,.35), transparent 60%);
  opacity: 0;
  transition: opacity .3s var(--ease);
  z-index: -1;
}
.btn:hover { transform: scale(1.04); box-shadow: var(--shadow-brand); }
.btn:hover::before { opacity: 1; }
.btn:active { transform: scale(.96); transition-duration: .1s; }

.btn--primary {
  background: var(--grad-brand);
  color: var(--n-0);
}
.btn--primary:hover { background: var(--grad-deep); }

.btn--outline {
  background: var(--n-0);
  color: var(--brand-700);
  border-color: var(--brand-700);
}
.btn--outline:hover { background: var(--brand-50); }

.btn--ghost {
  background: transparent;
  color: var(--n-0);
  border-color: rgba(255,255,255,.6);
}
.btn--ghost:hover { background: rgba(255,255,255,.14); }

.btn--dark { background: var(--n-900); color: var(--n-0); }
.btn--dark:hover { background: var(--n-800); }

.btn--sm { min-height: 40px; padding: 8px 18px; font-size: var(--fs-sm); }
.btn--block { width: 100%; }

/* 文字链 */
.link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-weight: 600;
  font-size: var(--fs-sm);
  color: var(--brand-700);
  border-bottom: 1px solid transparent;
  transition: gap .25s var(--ease), border-color .25s var(--ease);
}
.link-arrow::after { content: "→"; transition: transform .25s var(--ease); }
.link-arrow:hover { gap: 10px; border-bottom-color: var(--brand-700); }
.link-arrow:hover::after { transform: translateX(2px); }

.cta-group { display: flex; flex-wrap: wrap; gap: var(--s-2); }
.cta-group .btn { flex: 1 1 200px; }
@media (min-width: 576px) { .cta-group .btn { flex: 0 0 auto; } }

/* ==========================================================================
   顶部导航（玻璃态）
   ========================================================================== */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(255, 255, 255, .68);
  backdrop-filter: blur(18px) saturate(160%);
  -webkit-backdrop-filter: blur(18px) saturate(160%);
  border-bottom: 1px solid transparent;
  transition: background-color .35s var(--ease),
              border-color .35s var(--ease),
              box-shadow .35s var(--ease);
}
.site-header.is-stuck {
  background: rgba(255, 255, 255, .92);
  border-bottom-color: var(--n-200);
  box-shadow: 0 4px 24px rgba(14, 26, 34, .06);
}

.header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--s-2);
  height: 100%;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.brand__logo {
  width: 36px; height: 36px;
  border-radius: 10px;
  transition: transform .4s var(--ease-out);
}
.brand:hover .brand__logo { transform: rotate(-8deg) scale(1.06); }
.brand__name {
  font-size: 20px;
  font-weight: 800;
  color: var(--n-900);
  letter-spacing: 1px;
}
.brand__slogan {
  display: none;
  font-size: 12px;
  color: var(--n-500);
  border-left: 1px solid var(--n-200);
  padding-left: 10px;
}
@media (min-width: 992px) { .brand__slogan { display: block; } }

/* 汉堡按钮 */
.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: var(--r-sm);
  color: var(--n-900);
}
.nav-toggle__bars { position: relative; display: block; width: 22px; height: 2px; background: currentColor; }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute; left: 0; width: 22px; height: 2px; background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: -7px; }
.nav-toggle__bars::after { top: 7px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-7px) rotate(-45deg); }

/* 主导航 */
.primary-nav {
  position: fixed;
  top: var(--header-h);
  left: 0; right: 0;
  padding: var(--s-2) var(--gutter) var(--s-3);
  background: var(--n-0);
  border-bottom: 1px solid var(--n-200);
  box-shadow: var(--shadow-lg);
  transform: translateY(-12px);
  opacity: 0;
  visibility: hidden;
  transition: opacity .3s var(--ease), transform .3s var(--ease), visibility .3s;
}
.primary-nav.is-open { transform: translateY(0); opacity: 1; visibility: visible; }
.primary-nav__list { display: flex; flex-direction: column; gap: 4px; }
.primary-nav__link {
  display: block;
  padding: 12px 8px;
  font-size: 16px;
  font-weight: 600;
  color: var(--n-700);
  border-radius: var(--r-sm);
}
.primary-nav__link:hover { background: var(--n-100); color: var(--brand-700); }
.primary-nav__link[aria-current="page"] { color: var(--brand-700); }
.primary-nav__item--login { margin-top: var(--s-1); }

@media (min-width: 992px) {
  .nav-toggle { display: none; }
  .primary-nav {
    position: static;
    transform: none; opacity: 1; visibility: visible;
    padding: 0; background: none; border: 0; box-shadow: none;
    display: flex; align-items: center; gap: var(--s-2);
  }
  .primary-nav__list { flex-direction: row; align-items: center; gap: 4px; }
  .primary-nav__link { padding: 8px 4px; font-size: 15px; font-weight: 500; }
  .primary-nav__link:hover { background: none; }
  .primary-nav__link[aria-current="page"] { color: var(--brand-700); font-weight: 600; }
  .primary-nav__link::after {
    content: ""; display: block; height: 2px; margin-top: 4px;
    background: var(--grad-brand); border-radius: 2px;
    transform: scaleX(0); transform-origin: left;
    transition: transform .35s var(--ease);
  }
  .primary-nav__link:hover::after,
  .primary-nav__link[aria-current="page"]::after { transform: scaleX(1); }
  .primary-nav__item--login { margin: 0 0 0 var(--s-1); display: none; } /* 桌面端用 .header__login，避免与右侧按钮重复 */
}

.header__actions { display: flex; align-items: center; gap: var(--s-1); }
.header__login { display: none; }
@media (min-width: 992px) { .header__login { display: inline-flex; } }

/* ==========================================================================
   Hero（blob 背景 + 鼠标跟随渐变）
   ========================================================================== */
.hero {
  position: relative;
  padding-top: calc(var(--header-h) + var(--s-6));
  padding-bottom: var(--s-6);
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(80% 60% at 20% 0%, #EAFBF4 0%, transparent 60%),
    radial-gradient(80% 60% at 100% 100%, #E1F7FE 0%, transparent 60%),
    var(--n-0);
}
.hero::before, .hero::after {
  content: "";
  position: absolute;
  width: 540px; height: 540px;
  border-radius: 50%;
  filter: blur(80px);
  opacity: .55;
  pointer-events: none;
  z-index: -1;
  transition: transform .8s var(--ease-out);
}
.hero::before {
  background: radial-gradient(circle, var(--brand-300), transparent 65%);
  top: -180px; left: calc(50% + var(--mx, 0) * 20px);
  transform: translate(-50%, 0);
}
.hero::after {
  background: radial-gradient(circle, var(--tech-300), transparent 65%);
  bottom: -200px; right: calc(50% - var(--mx, 0) * 20px);
  transform: translate(50%, 0);
}

.hero__inner {
  position: relative;
  display: grid;
  gap: var(--s-5);
  align-items: center;
}
.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  margin-bottom: var(--s-2);
  font-size: var(--fs-sm);
  font-weight: 600;
  color: var(--brand-700);
  background: rgba(26, 174, 99, .12);
  border: 1px solid rgba(26, 174, 99, .25);
  border-radius: var(--r-pill);
  width: max-content;
}
.hero__badge .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--brand-500);
  box-shadow: 0 0 0 0 rgba(26, 174, 99, .6);
  animation: pulse 1.8s var(--ease) infinite;
}
@keyframes pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(26, 174, 99, .6); }
  50%      { box-shadow: 0 0 0 10px rgba(26, 174, 99, 0); }
}

.hero__title { color: var(--n-900); margin-bottom: var(--s-2); }
.hero__title em {
  font-style: normal;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  background-size: 200% 200%;
  animation: gradient-shift 6s ease-in-out infinite;
  white-space: nowrap;
}
.hero__lead {
  font-size: var(--fs-lead);
  color: var(--n-600);
  max-width: 36em;
  margin-bottom: var(--s-3);
}
.hero__note { margin-top: var(--s-2); font-size: var(--fs-sm); color: var(--n-500); }
.hero__note a { color: var(--brand-700); font-weight: 600; }

/* 滚动提示 */
.scroll-hint {
  display: none;
  align-items: center;
  gap: 8px;
  margin-top: var(--s-3);
  font-size: var(--fs-sm);
  color: var(--n-500);
}
.scroll-hint__mouse {
  width: 22px; height: 36px; border: 2px solid var(--n-400); border-radius: 12px; position: relative;
}
.scroll-hint__mouse::after {
  content: ""; position: absolute; top: 6px; left: 50%; transform: translateX(-50%);
  width: 3px; height: 6px; border-radius: 2px; background: var(--n-500);
  animation: scroll-hint 1.6s var(--ease) infinite;
}
@keyframes scroll-hint {
  0%   { opacity: 1; transform: translate(-50%, 0); }
  60%  { opacity: 0; transform: translate(-50%, 10px); }
  100% { opacity: 0; transform: translate(-50%, 10px); }
}
@media (min-width: 992px) { .scroll-hint { display: inline-flex; } }

/* 手机模型（浮动 + 鼠标 hover 切换截图） */
.hero__visual { position: relative; }
.phone {
  position: relative;
  width: min(280px, 78vw);
  margin-inline: auto;
  padding: 10px;
  background: linear-gradient(145deg, #2a3540, #0e1a22);
  border-radius: 42px;
  box-shadow: 0 24px 60px rgba(14, 26, 34, .32), inset 0 0 0 1px rgba(255,255,255,.06);
  animation: phone-float 6s var(--ease) infinite;
}
@keyframes phone-float {
  0%, 100% { transform: translateY(0); }
  50%      { transform: translateY(-12px); }
}
.phone__screen {
  position: relative;
  aspect-ratio: 9 / 19.5;
  border-radius: 32px;
  overflow: hidden;
  background: var(--n-100);
}
.phone__screen img {
  width: 100%; height: 100%; object-fit: cover;
  transition: opacity .5s var(--ease);
}
.phone__notch {
  position: absolute;
  top: 10px; left: 50%;
  transform: translateX(-50%);
  width: 96px; height: 22px;
  background: var(--n-900);
  border-radius: var(--r-pill);
  z-index: 2;
}

@media (min-width: 992px) {
  .hero { padding-top: calc(var(--header-h) + var(--s-10)); padding-bottom: var(--s-10); }
  .hero__inner { grid-template-columns: 1.05fr .95fr; gap: var(--s-8); }
  .hero__copy { text-align: left; }
}

/* ==========================================================================
   数据信任带
   ========================================================================== */
.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--s-2);
  padding-block: var(--s-4);
  background: var(--n-950);
  color: var(--n-0);
  position: relative;
  overflow: hidden;
}
.stats::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--grad-brand);
  opacity: .18;
  pointer-events: none;
}
.stat {
  text-align: center;
  position: relative;
}
.stat__num {
  font-family: var(--font-num);
  font-size: clamp(22px, 5.6vw, 36px);
  font-weight: 800;
  color: var(--brand-300);
  letter-spacing: .5px;
}
.stat__label { font-size: var(--fs-sm); color: rgba(255,255,255,.7); }
@media (min-width: 768px) { .stats { gap: var(--s-4); } }

/* ==========================================================================
   能力卡片
   ========================================================================== */
.feature-grid {
  display: grid;
  gap: var(--s-2);
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
}
.feature-card {
  display: flex;
  flex-direction: column;
  padding: var(--s-3);
  background: var(--n-0);
  border: 1px solid var(--n-200);
  border-radius: var(--r-card);
  position: relative;
  overflow: hidden;
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out), border-color .35s var(--ease-out);
}
.feature-card::before {
  content: "";
  position: absolute; inset: 0;
  background: var(--grad-brand);
  opacity: 0;
  transition: opacity .35s var(--ease);
  pointer-events: none;
}
.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.feature-card:hover::before { opacity: 1; }
.feature-card > * { position: relative; }
.feature-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px; height: 48px;
  margin-bottom: var(--s-2);
  border-radius: var(--r-card);
  background: var(--brand-100);
  color: var(--brand-700);
  transition: background .3s var(--ease), color .3s var(--ease), transform .35s var(--ease-out);
}
.feature-card:hover .feature-card__icon {
  background: rgba(255,255,255,.95);
  color: var(--brand-700);
  transform: rotate(-8deg) scale(1.05);
}
.feature-card__icon svg { width: 24px; height: 24px; }
.feature-card__title { margin-bottom: 8px; transition: color .3s var(--ease); }
/* 强制 feature-card 内文字为深色，避免被 .section--dark 的白色覆盖而在白卡上"消失" */
.feature-card h3 { color: var(--n-900); }
.feature-card p  { color: var(--n-500); }
.feature-card:hover h3 { color: var(--n-0); }
.feature-card:hover p  { color: rgba(255,255,255,.84); }
.feature-card:hover .feature-card__title,
.feature-card:hover .feature-card__desc { color: var(--n-0); }
.feature-card:hover .feature-card__desc { color: rgba(255,255,255,.84); }
.feature-card__desc { font-size: var(--fs-sm); color: var(--n-500); margin-bottom: var(--s-2); }
.feature-card__foot { margin-top: auto; }
.feature-card__foot .link-arrow { color: var(--brand-700); }
.feature-card:hover .feature-card__foot .link-arrow { color: var(--n-0); border-bottom-color: var(--n-0); }

.feature-card--highlight { background: var(--grad-soft); border-color: var(--brand-200); }
.feature-card--highlight::before { display: none; }
.feature-card--highlight:hover { background: var(--grad-brand); }

/* 带截图的卡片 */
.shot-card { padding: 0; }
.shot-card__media {
  aspect-ratio: 16 / 10;
  background: var(--n-100);
  border-bottom: 1px solid var(--n-200);
  overflow: hidden;
  position: relative;
}
.shot-card__media::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 60%, rgba(255,255,255,.2));
}
.shot-card__media img {
  width: 100%; height: 100%; object-fit: cover; object-position: top center;
  transition: transform .8s var(--ease-out);
}
.feature-card:hover .shot-card__media img { transform: scale(1.06); }
.shot-card__body { padding: var(--s-3); display: flex; flex-direction: column; gap: 8px; flex: 1; }
.shot-card__tag {
  align-self: flex-start;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 600;
  color: var(--brand-700);
  background: var(--brand-100);
  border-radius: var(--r-pill);
  transition: background .3s var(--ease), color .3s var(--ease);
}
.feature-card:hover .shot-card__tag { background: rgba(255,255,255,.18); color: var(--n-0); }

/* ==========================================================================
   真机四联展示（独立四列）
   ========================================================================== */
.shot-quad {
  display: grid;
  gap: var(--s-2);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}
.shot-quad__item {
  position: relative;
  border-radius: var(--r-card);
  overflow: hidden;
  background: var(--n-100);
  aspect-ratio: 9 / 19.5;
  border: 1px solid var(--n-200);
  transition: transform .4s var(--ease-out), box-shadow .4s var(--ease-out);
}
.shot-quad__item:hover { transform: translateY(-6px) scale(1.02); box-shadow: var(--shadow-lg); }
.shot-quad__item img { width: 100%; height: 100%; object-fit: cover; }
.shot-quad__caption {
  position: absolute;
  inset: auto 0 0 0;
  padding: 12px 14px;
  background: linear-gradient(0deg, rgba(0,0,0,.7), transparent);
  color: var(--n-0);
  font-weight: 600;
  font-size: 14px;
  display: flex; justify-content: space-between; align-items: end;
}
.shot-quad__caption small { font-weight: 400; opacity: .75; }

/* ==========================================================================
   商家合作专区 / 步骤
   ========================================================================== */
.partner-zone {
  background: var(--grad-soft);
  border-block: 1px solid var(--brand-200);
}
.steps {
  display: grid;
  gap: var(--s-2);
  counter-reset: step;
}
.step {
  position: relative;
  padding: var(--s-3);
  background: var(--n-0);
  border: 1px solid var(--n-200);
  border-radius: var(--r-card);
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px; height: 40px;
  margin-bottom: var(--s-2);
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 700;
  color: var(--n-0);
  background: var(--grad-brand);
  border-radius: 50%;
}
.step__title { margin-bottom: 8px; }
.step__desc { font-size: var(--fs-sm); color: var(--n-500); }
.steps__connector { display: none; }
@media (min-width: 768px) {
  .steps { grid-template-columns: repeat(3, 1fr); gap: var(--s-3); position: relative; }
  .step { padding-block: var(--s-4); }
  .steps__connector {
    display: block;
    position: absolute;
    top: 52px;
    left: 16%; right: 16%;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--brand-300) 0 8px, transparent 8px 16px);
  }
}

.value-grid {
  display: grid;
  gap: var(--s-2);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}
.value-card {
  padding: var(--s-3);
  background: var(--n-0);
  border: 1px solid var(--n-200);
  border-radius: var(--r-card);
  transition: transform .35s var(--ease-out), box-shadow .35s var(--ease-out);
  position: relative;
  overflow: hidden;
}
.value-card::after {
  content: ""; position: absolute; top: -40%; right: -40%;
  width: 200px; height: 200px;
  background: radial-gradient(circle, var(--brand-100), transparent 60%);
  opacity: 0;
  transition: opacity .4s var(--ease);
}
.value-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.value-card:hover::after { opacity: 1; }
.value-card__icon {
  display: inline-flex; align-items: center; justify-content: center;
  width: 44px; height: 44px; margin-bottom: var(--s-2);
  color: var(--brand-700); background: var(--brand-100); border-radius: var(--r-card);
  position: relative;
}
.value-card__icon svg { width: 22px; height: 22px; }
.value-card__title { margin-bottom: 8px; }
.value-card__desc { font-size: var(--fs-sm); color: var(--n-500); }

.join-banner {
  display: grid;
  gap: var(--s-3);
  padding: var(--s-4);
  background: var(--n-950);
  color: var(--n-0);
  border-radius: var(--r-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.join-banner::before {
  content: "";
  position: absolute; inset: -1px;
  background: var(--grad-brand);
  opacity: .25;
  z-index: -1;
}
.join-banner__title { color: var(--n-0); }
.join-banner__desc { color: rgba(255,255,255,.76); font-size: var(--fs-sm); }
.join-banner .cta-group { justify-content: center; }
.join-banner .btn--outline { background: transparent; color: var(--n-0); border-color: rgba(255,255,255,.6); }
.join-banner .btn--outline:hover { background: rgba(255,255,255,.12); }

/* ==========================================================================
   下载区
   ========================================================================== */
.download__inner {
  display: grid;
  gap: var(--s-4);
  align-items: center;
  justify-items: center;
  text-align: center;
}
.qr {
  width: 168px; height: 168px;
  display: grid;
  place-items: center;
  padding: 12px;
  border: 2px dashed var(--n-300);
  border-radius: var(--r-card);
  background: var(--n-50);
  color: var(--n-500);
  font-size: 12px;
  text-align: center;
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}
.qr:hover { border-color: var(--brand-500); background: var(--brand-50); }
.store-list { display: flex; flex-wrap: wrap; gap: var(--s-1); justify-content: center; }
.store-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 10px 18px;
  background: var(--n-900);
  color: var(--n-0);
  border-radius: var(--r-pill);
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: transform var(--dur-fast) var(--ease);
}
.store-btn:hover { transform: scale(1.04); }
.store-btn:active { transform: scale(.96); }
.store-btn svg { width: 20px; height: 20px; flex-shrink: 0; }
.store-btn__sub { display: block; font-size: 11px; font-weight: 400; opacity: .72; }
@media (min-width: 768px) {
  .download__inner { grid-template-columns: auto 1fr; text-align: left; justify-items: start; }
  .store-list { justify-content: flex-start; }
}

/* ==========================================================================
   FAQ
   ========================================================================== */
.faq { display: grid; gap: var(--s-1); max-width: 800px; }
.faq__item {
  border: 1px solid var(--n-200);
  border-radius: var(--r-card);
  background: var(--n-0);
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}
.faq__item[open] { border-color: var(--brand-500); box-shadow: var(--shadow-md); }
.faq__q {
  display: flex; align-items: center; justify-content: space-between; gap: var(--s-2);
  width: 100%; padding: var(--s-2) var(--s-3);
  font-size: var(--fs-body); font-weight: 600; color: var(--n-900); text-align: left;
}
.faq__q::after {
  content: "+"; font-size: 22px; color: var(--brand-700); line-height: 1;
  transition: transform .35s var(--ease);
}
.faq__item[open] .faq__q::after { content: "−"; }
.faq__a { padding: 0 var(--s-3) var(--s-2); font-size: var(--fs-sm); color: var(--n-500); }

/* ==========================================================================
   页脚
   ========================================================================== */
.site-footer {
  padding-block: var(--s-6) var(--s-3);
  background: var(--n-950);
  color: rgba(255,255,255,.7);
  font-size: var(--fs-sm);
  position: relative;
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  top: 0; left: 50%;
  transform: translateX(-50%);
  width: 80%; max-width: 720px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--brand-500), var(--tech-400), transparent);
  opacity: .5;
}
.footer__grid { display: grid; gap: var(--s-4); }
.footer__brand { display: flex; align-items: center; gap: 10px; margin-bottom: var(--s-2); }
.footer__brand img { width: 32px; height: 32px; border-radius: 8px; }
.footer__brand-name { font-size: 18px; font-weight: 800; color: var(--n-0); }
.footer__title { color: var(--n-0); font-weight: 600; margin-bottom: var(--s-1); font-size: 14px; }
.footer__list { display: grid; gap: 8px; }
.footer__list a:hover { color: var(--n-0); text-decoration: underline; text-decoration-color: var(--brand-400); }
.footer__contact { display: grid; gap: 6px; }
.footer__bottom {
  margin-top: var(--s-4);
  padding-top: var(--s-2);
  border-top: 1px solid rgba(255,255,255,.14);
  display: grid;
  gap: 8px;
  color: rgba(255,255,255,.56);
}
.footer__bottom a:hover { color: var(--n-0); }
@media (min-width: 768px) {
  .footer__grid { grid-template-columns: 1.4fr 1fr 1fr 1.2fr; gap: var(--s-3); }
  .footer__bottom { grid-template-columns: 1fr auto; align-items: center; }
}

/* ==========================================================================
   关于页：团队/历程
   ========================================================================== */
.timeline { display: grid; gap: var(--s-2); position: relative; padding-left: 28px; }
.timeline::before {
  content: "";
  position: absolute;
  top: 0; bottom: 0; left: 8px;
  width: 2px;
  background: var(--grad-brand);
  opacity: .35;
}
.timeline__item { position: relative; padding-block: 12px; }
.timeline__item::before {
  content: "";
  position: absolute;
  left: -24px; top: 18px;
  width: 12px; height: 12px;
  border-radius: 50%;
  background: var(--brand-500);
  box-shadow: 0 0 0 4px var(--brand-100);
}
.timeline__year { font-family: var(--font-num); font-weight: 700; color: var(--brand-700); font-size: 18px; }
.timeline__title { margin-top: 4px; }
.timeline__desc { font-size: var(--fs-sm); color: var(--n-500); margin-top: 4px; }

.metric-grid {
  display: grid;
  gap: var(--s-2);
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
}
.metric-card {
  padding: var(--s-3);
  background: var(--grad-soft);
  border-radius: var(--r-card);
  text-align: center;
  transition: transform .35s var(--ease-out);
}
.metric-card:hover { transform: translateY(-4px); }
.metric-card__num {
  font-family: var(--font-num);
  font-size: clamp(28px, 4vw, 38px);
  font-weight: 800;
  background: var(--grad-brand);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.metric-card__label { font-size: var(--fs-sm); color: var(--n-500); margin-top: 6px; }

/* ==========================================================================
   弹窗
   ========================================================================== */
.modal {
  position: fixed;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  width: min(420px, calc(100vw - 32px));
  max-height: calc(100dvh - 32px);
  overflow: auto;
  padding: var(--s-3);
  border: 0;
  border-radius: var(--r-lg);
  background: var(--n-0);
  color: var(--n-700);
  box-shadow: var(--shadow-lg);
}
.modal::backdrop { background: rgba(14, 26, 34, .66); }
.modal[open] { animation: modal-in .35s var(--ease); }
@keyframes modal-in {
  from { opacity: 0; transform: translate(-50%, -50%) scale(.94); }
  to   { opacity: 1; transform: translate(-50%, -50%) scale(1); }
}
.modal__title { margin-bottom: 8px; }
.modal__desc { font-size: var(--fs-sm); color: var(--n-500); margin-bottom: var(--s-3); }
.modal__url {
  display: block;
  padding: 10px 12px;
  margin-bottom: var(--s-3);
  font-family: var(--font-num);
  font-size: 13px;
  color: var(--n-700);
  background: var(--n-100);
  border-radius: var(--r-sm);
  word-break: break-all;
}
.modal__actions { display: flex; flex-wrap: wrap; gap: var(--s-1); }
.modal__actions .btn { flex: 1 1 140px; }

/* ==========================================================================
   下载二维码弹窗 .modal--qr
   ========================================================================== */
.modal--qr {
  width: min(440px, calc(100vw - 32px));
  padding: 0;
  overflow: auto;
  background: var(--n-0);
  color: var(--n-700);
}
.modal--qr .modal__hero {
  position: relative;
  padding: var(--s-3) var(--s-4) var(--s-2);
  text-align: center;
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--tech-500) 100%);
  color: var(--n-0);
  overflow: hidden;
}
.modal--qr .modal__hero::before {
  content: '';
  position: absolute; inset: 0;
  background:
    radial-gradient(circle at 18% 10%, rgba(255,255,255,.22) 0%, transparent 55%),
    radial-gradient(circle at 88% 100%, rgba(255,255,255,.14) 0%, transparent 55%);
  pointer-events: none;
}
.modal--qr .modal__brand-row {
  position: relative;
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 12px; font-weight: 600; letter-spacing: .04em;
  opacity: .86; margin-bottom: 6px;
  padding: 4px 10px;
  background: rgba(255,255,255,.16);
  border-radius: 999px;
}
.modal--qr .modal__brand-row img { width: 14px; height: 14px; }
.modal--qr .modal__title {
  position: relative;
  margin: 0 0 4px;
  color: var(--n-0);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: .02em;
}
.modal--qr .modal__sub {
  position: relative;
  color: rgba(255,255,255,.86);
  font-size: 13px;
  margin: 0;
}
.modal--qr .modal__body { padding: var(--s-3) var(--s-3) var(--s-3); text-align: center; }

.modal__close {
  position: absolute;
  top: 12px; right: 12px;
  width: 32px; height: 32px;
  border: 0;
  background: rgba(255,255,255,.18);
  color: var(--n-0);
  border-radius: 999px;
  font-size: 22px; line-height: 1;
  cursor: pointer;
  display: inline-flex; align-items: center; justify-content: center;
  transition: background .2s var(--ease), transform .15s var(--ease);
  z-index: 2;
}
.modal__close:hover { background: rgba(255,255,255,.32); }
.modal__close:active { transform: scale(.92); }

.qr-frame {
  position: relative;
  display: inline-block;
  margin: 0 auto var(--s-2);
  padding: 14px;
  background: var(--n-0);
  border-radius: 20px;
  box-shadow:
    0 12px 32px rgba(26, 174, 99, .16),
    0 0 0 1px rgba(26, 174, 99, .14);
  isolation: isolate;
}
.qr-frame img {
  display: block;
  width: 240px; height: 240px;
  border-radius: 10px;
}
.qr-frame__corner {
  position: absolute; width: 22px; height: 22px;
  border: 3px solid var(--brand-500);
  pointer-events: none;
}
.qr-frame__corner--tl { top: 4px; left: 4px; border-right: 0; border-bottom: 0; border-top-left-radius: 8px; }
.qr-frame__corner--tr { top: 4px; right: 4px; border-left: 0; border-bottom: 0; border-top-right-radius: 8px; }
.qr-frame__corner--bl { bottom: 4px; left: 4px; border-right: 0; border-top: 0; border-bottom-left-radius: 8px; }
.qr-frame__corner--br { bottom: 4px; right: 4px; border-left: 0; border-top: 0; border-bottom-right-radius: 8px; }
.qr-frame__scan {
  position: absolute;
  left: 16px; right: 16px; height: 2px;
  background: linear-gradient(90deg, transparent, var(--brand-500), transparent);
  border-radius: 2px;
  top: 16px;
  box-shadow: 0 0 14px rgba(26, 174, 99, .7);
  animation: qr-scan 2.4s ease-in-out infinite;
  pointer-events: none;
  opacity: 0;
}
@keyframes qr-scan {
  0%   { transform: translateY(0);     opacity: 0; }
  12%  { opacity: 1; }
  50%  { transform: translateY(216px); opacity: 1; }
  62%  { opacity: 1; }
  100% { transform: translateY(216px); opacity: 0; }
}

.qr-modal__pills {
  display: flex; gap: var(--s-1); justify-content: center; flex-wrap: wrap;
  margin-bottom: var(--s-2);
}
.qr-modal__pill {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 6px 12px;
  background: var(--n-100);
  color: var(--n-700);
  border-radius: 999px;
  font-size: 13px; font-weight: 600;
}
.qr-modal__pill svg { width: 16px; height: 16px; color: var(--brand-500); }
.qr-modal__pill--ghost { color: var(--n-500); }
.qr-modal__pill--ghost svg { color: var(--n-500); }

.qr-modal__url {
  display: flex; align-items: center; gap: 8px;
  padding: 10px 12px;
  margin: 0 0 var(--s-2);
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--n-700);
  background: var(--n-100);
  border-radius: var(--r-sm);
  word-break: break-all;
  text-align: left;
}
.qr-modal__url svg { flex: 0 0 14px; width: 14px; height: 14px; color: var(--n-500); }

.modal__cta {
  display: flex; align-items: center; justify-content: center; gap: 6px;
  width: 100%;
  padding: 12px 16px;
  background: linear-gradient(135deg, var(--brand-500) 0%, var(--tech-500) 100%);
  color: var(--n-0);
  border: 0;
  border-radius: var(--r-md);
  font: 600 15px/1 var(--font-cn);
  cursor: pointer;
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
  box-shadow: 0 6px 18px rgba(26, 174, 99, .28);
}
.modal__cta:hover { transform: translateY(-1px); box-shadow: 0 10px 24px rgba(26, 174, 99, .36); }
.modal__cta:active { transform: translateY(0); }

/* 替换下载页占位二维码为真实图 */
.qr--real {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 8px;
  padding: 12px;
  background: var(--n-0);
  border: 1px solid var(--n-100);
  border-radius: var(--r-md);
  box-shadow: var(--shadow-sm);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
  cursor: pointer;
  color: var(--n-700);
}
.qr--real:hover {
  border-color: var(--brand-500);
  transform: translateY(-2px);
  box-shadow: 0 12px 28px rgba(26, 174, 99, .18);
}
.qr--real img {
  display: block;
  width: 180px; height: 180px;
  border-radius: 10px;
}
.qr--real__hint {
  font-size: 12px; font-weight: 600; color: var(--brand-500);
}
.qr--real__hint::before { content: '🔍 '; }

/* ==========================================================================
   无障碍：减弱动效
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .reveal, .chars > .char, .chars-mask > .char { opacity: 1 !important; transform: none !important; }
  .btn:hover, .btn:active, .feature-card:hover, .shot-quad__item:hover,
  .phone, .step:hover, .value-card:hover, .metric-card:hover { transform: none !important; }
  .cursor-follower { display: none; }
}

/* ---------- 工具类 ---------- */
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0;
  margin: -1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.center { text-align: center; }
.mt-2 { margin-top: var(--s-2); }
.mt-3 { margin-top: var(--s-3); }
.mt-4 { margin-top: var(--s-4); }