:root {
  --bg: #f5f5f7;
  --surface: #ffffff;
  --surface-soft: #fbfbfd;
  --text: #1d1d1f;
  --muted: #6e6e73;
  --dim: #86868b;
  --line: #d2d2d7;
  --line-soft: rgba(29, 29, 31, 0.1);
  --blue: #3478f6;
  --green: #29c869;
  --amber: #f5a524;
  --shadow: rgba(29, 29, 31, 0.16);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  background: var(--bg);
}

body {
  margin: 0;
  background:
    linear-gradient(180deg, #ffffff 0, var(--bg) 560px, #ffffff 100%);
  color: var(--text);
  font-family: "SF Pro Display", "PingFang SC", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  letter-spacing: 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: geometricPrecision;
}

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

button {
  font: inherit;
}

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

.site-header {
  position: fixed;
  z-index: 20;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: 64px;
  padding: 0 44px;
  border-bottom: 1px solid rgba(210, 210, 215, 0.62);
  background: rgba(251, 251, 253, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
}

.brand-lockup {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 17px;
  font-weight: 760;
}

.brand-icon {
  width: 54px;
  height: 22px;
  object-fit: contain;
  box-shadow:
    0 1px 2px rgba(29, 29, 31, 0.08),
    0 8px 18px rgba(29, 29, 31, 0.08);
}

.site-nav {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 4px;
  border: 1px solid rgba(210, 210, 215, 0.72);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.62);
}

.site-nav a {
  min-height: 34px;
  padding: 8px 14px;
  border-radius: 999px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 650;
  transition:
    background-color 180ms ease,
    color 180ms ease;
}

.site-nav a:hover,
.site-nav a:focus-visible {
  background: var(--text);
  color: #fff;
  outline: none;
}

.site-nav .nav-download {
  background: var(--text);
  color: #fff;
}

.hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  display: grid;
  align-items: center;
  min-height: 88svh;
  padding: 104px 28px 72px;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: min(1120px, 100%);
  margin: 0 auto;
  text-align: center;
}

.eyebrow {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  font-weight: 760;
  letter-spacing: 0;
}

.hero-eyebrow {
  margin-bottom: 22px;
}

.hero-title {
  display: grid;
  gap: 4px;
  margin: 0;
  color: var(--text);
  font-size: 92px;
  line-height: 0.96;
  font-weight: 880;
  letter-spacing: 0;
}

.hero-copy {
  width: min(650px, 100%);
  margin: 24px auto 0;
  color: var(--muted);
  font-size: 22px;
  line-height: 1.35;
  font-weight: 560;
}

.hero-actions,
.closing-actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.primary-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 12px 21px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 720;
  transition:
    transform 180ms ease,
    background-color 180ms ease,
    color 180ms ease,
    border-color 180ms ease;
}

.primary-action {
  background: var(--text);
  color: #fff;
}

.primary-action:hover,
.primary-action:focus-visible {
  transform: translateY(-1px);
  outline: none;
}

.hero-stage {
  width: min(740px, 100%);
  margin: 36px auto 0;
  padding: 20px 28px 18px;
  border-top: 1px solid rgba(29, 29, 31, 0.08);
  border-bottom: 1px solid rgba(29, 29, 31, 0.08);
}

.notch-shot {
  width: min(400px, 72%);
  height: auto;
  margin: 0 auto;
  filter: drop-shadow(0 20px 38px rgba(29, 29, 31, 0.24));
}

.hero-status-row {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px 18px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 700;
}

.hero-status-row span {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.status-dot {
  display: inline-block;
  width: 8px;
  height: 8px;
  border-radius: 999px;
}

.blue {
  background: var(--blue);
}

.green {
  background: var(--green);
}

.amber {
  background: var(--amber);
}

.preview-band {
  position: relative;
  z-index: 2;
  margin-top: -78px;
  padding: 18px 28px 76px;
}

.preview-inner {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  width: min(980px, 100%);
  margin: 0 auto;
  overflow: hidden;
  border: 1px solid rgba(210, 210, 215, 0.74);
  border-radius: 8px;
  background: rgba(210, 210, 215, 0.74);
  box-shadow: 0 28px 70px rgba(29, 29, 31, 0.08);
}

.preview-inner article {
  min-height: 116px;
  padding: 24px;
  background: rgba(255, 255, 255, 0.86);
}

.preview-inner span {
  display: block;
  margin-bottom: 12px;
  color: var(--dim);
  font-size: 13px;
  font-weight: 760;
}

.preview-inner strong {
  display: block;
  max-width: 240px;
  font-size: 18px;
  line-height: 1.28;
  font-weight: 760;
}

.story {
  position: relative;
  background:
    linear-gradient(180deg, #ffffff 0, #f7f7f9 48%, #ffffff 100%);
}

.story-pin {
  display: grid;
  grid-template-columns: minmax(300px, 0.82fr) minmax(0, 1.18fr);
  gap: 58px;
  min-height: 100svh;
  width: min(1220px, calc(100% - 56px));
  margin: 0 auto;
  padding: 110px 0 96px;
  align-items: center;
}

.story-copy {
  position: relative;
  min-height: 520px;
}

.story-copy h2 {
  margin: 16px 0 54px;
  max-width: 470px;
  font-size: 58px;
  line-height: 1.02;
  font-weight: 860;
  letter-spacing: 0;
}

.story-panels {
  position: relative;
  min-height: 210px;
}

.story-panel {
  position: absolute;
  inset: 0 auto auto 0;
  width: min(420px, 100%);
  opacity: 0;
  visibility: hidden;
}

.story-panel.is-active {
  opacity: 1;
  visibility: visible;
}

.story-index {
  display: inline-flex;
  margin-bottom: 18px;
  color: var(--dim);
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 780;
}

.story-panel h3,
.mobile-step h3 {
  margin: 0;
  font-size: 40px;
  line-height: 1.06;
  font-weight: 840;
  letter-spacing: 0;
}

.story-panel p,
.mobile-step p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 21px;
  line-height: 1.38;
  font-weight: 560;
}

.story-controls {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 72px;
}

.story-dot {
  width: 10px;
  height: 10px;
  padding: 0;
  border: 0;
  border-radius: 999px;
  background: rgba(29, 29, 31, 0.18);
  cursor: pointer;
  transition:
    width 180ms ease,
    background-color 180ms ease;
}

.story-dot.is-active {
  width: 34px;
  background: var(--text);
}

.story-dot:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 5px;
}

.story-visual {
  position: relative;
  min-height: 560px;
  perspective: 1200px;
}

.story-shot {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  margin: 0;
  opacity: 0;
  visibility: hidden;
}

.story-shot.is-active {
  opacity: 1;
  visibility: visible;
}

.story-shot img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(29, 29, 31, 0.08);
  border-radius: 8px;
  box-shadow: 0 38px 80px var(--shadow);
}

.product-shot img {
  width: min(780px, 100%);
}

.mobile-steps {
  display: none;
}

.more-features {
  padding: 108px 28px 126px;
  background:
    linear-gradient(180deg, #ffffff 0, #f5f5f7 46%, #ffffff 100%);
}

.more-inner {
  width: min(1680px, 100%);
  margin: 0 auto;
}

.more-inner > h2 {
  width: min(720px, 100%);
  margin: 18px 0 66px;
  font-size: 64px;
  line-height: 1;
  font-weight: 880;
  letter-spacing: 0;
}

.feature-stack {
  display: grid;
  gap: 34px;
}

.feature-row {
  display: grid;
  grid-template-columns: minmax(330px, 0.36fr) minmax(0, 1fr);
  gap: 16px;
  align-items: center;
  padding: 16px;
  border: 1px solid rgba(210, 210, 215, 0.76);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.68);
  box-shadow: 0 30px 78px rgba(29, 29, 31, 0.08);
}

.feature-copy {
  min-width: 0;
  display: flex;
  min-height: 284px;
  flex-direction: column;
  justify-content: center;
  padding: 34px 30px;
  border: 1px solid rgba(210, 210, 215, 0.78);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.9);
}

.feature-index {
  display: inline-flex;
  margin-bottom: 16px;
  color: var(--dim);
  font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
  font-size: 13px;
  font-weight: 780;
}

.feature-copy h3 {
  margin: 0;
  font-size: 42px;
  line-height: 1.04;
  font-weight: 850;
  letter-spacing: 0;
}

.feature-copy p {
  margin: 18px 0 0;
  color: var(--muted);
  font-size: 20px;
  line-height: 1.38;
  font-weight: 560;
}

.feature-shot {
  margin: 0;
  min-width: 0;
}

.feature-shot img {
  width: 100%;
  height: auto;
  border: 1px solid rgba(29, 29, 31, 0.08);
  border-radius: 8px;
  box-shadow: 0 28px 62px rgba(29, 29, 31, 0.14);
}

.closing {
  padding: 116px 28px 132px;
  background: #fff;
}

.closing-inner {
  width: min(840px, 100%);
  margin: 0 auto;
  text-align: center;
}

.closing-brand {
  margin: 0 0 18px;
  color: var(--text);
  font-size: 132px;
  line-height: 0.96;
  font-weight: 880;
  letter-spacing: 0;
}

.closing h2 {
  margin: 0 0 20px;
  font-size: 76px;
  line-height: 1;
  font-weight: 880;
  letter-spacing: 0;
}

.closing p:not(.eyebrow) {
  width: min(540px, 100%);
  margin: 0 auto;
  color: var(--muted);
  font-size: 22px;
  line-height: 1.36;
  font-weight: 560;
}

.no-gsap .story-panel,
.reduced-motion .story-panel {
  position: relative;
  visibility: visible;
  opacity: 1;
  margin-bottom: 26px;
}

.no-gsap .story-panels,
.reduced-motion .story-panels {
  display: grid;
  gap: 22px;
}

.no-gsap .story-shot,
.reduced-motion .story-shot {
  position: relative;
  visibility: visible;
  opacity: 1;
  margin-bottom: 26px;
}

.reduced-motion .story-pin,
.no-gsap .story-pin {
  grid-template-columns: 1fr;
}

@media (max-width: 1500px) and (min-width: 981px) {
  .hero-title {
    font-size: 78px;
  }

  .hero-copy {
    margin-top: 20px;
    font-size: 20px;
  }

  .hero-actions,
  .closing-actions {
    margin-top: 26px;
  }

  .hero-stage {
    margin-top: 28px;
    padding-top: 16px;
    padding-bottom: 14px;
  }

  .notch-shot {
    width: min(360px, 68%);
  }

  .hero-status-row {
    margin-top: 18px;
  }
}

@media (max-width: 980px) {
  .site-header {
    padding: 0 22px;
  }

  .site-nav {
    gap: 2px;
  }

  .site-nav a {
    padding: 8px 10px;
    font-size: 13px;
  }

  .hero {
    min-height: 88svh;
    padding-top: 96px;
  }

  .hero-title {
    font-size: 76px;
  }

  .hero-copy {
    font-size: 21px;
  }

  .preview-inner {
    grid-template-columns: 1fr;
  }

  .preview-inner article {
    min-height: 92px;
  }

  .story-pin {
    display: block;
    min-height: auto;
    padding: 78px 0 28px;
  }

  .story-copy {
    min-height: auto;
  }

  .story-copy h2 {
    margin-bottom: 28px;
    font-size: 48px;
  }

  .story-panels,
  .story-visual,
  .story-controls {
    display: none;
  }

  .mobile-steps {
    display: grid;
    gap: 34px;
    width: min(760px, calc(100% - 44px));
    margin: 0 auto;
    padding: 0 0 84px;
  }

  .mobile-step {
    padding: 18px;
    border: 1px solid rgba(210, 210, 215, 0.74);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.86);
    box-shadow: 0 20px 46px rgba(29, 29, 31, 0.08);
  }

  .mobile-step img {
    width: 100%;
    margin-bottom: 24px;
    border: 1px solid rgba(29, 29, 31, 0.08);
    border-radius: 8px;
    box-shadow: 0 22px 42px rgba(29, 29, 31, 0.12);
  }

  .mobile-step span {
    display: inline-flex;
    margin-bottom: 12px;
    color: var(--dim);
    font-family: "SF Mono", ui-monospace, Menlo, Consolas, monospace;
    font-size: 12px;
    font-weight: 780;
  }

  .mobile-step h3 {
    font-size: 34px;
  }

  .mobile-step p {
    font-size: 19px;
  }

  .closing h2 {
    font-size: 58px;
  }

  .more-features {
    padding: 84px 22px 94px;
  }

  .more-inner > h2 {
    margin-bottom: 34px;
    font-size: 46px;
  }

  .feature-row {
    grid-template-columns: 1fr;
    gap: 24px;
    padding: 14px;
  }

  .feature-copy {
    min-height: auto;
    padding: 26px 24px;
  }

  .feature-copy h3 {
    font-size: 34px;
  }

  .feature-copy p {
    font-size: 18px;
  }
}

@media (max-width: 620px) {
  .site-header {
    height: 58px;
  }

  .brand-lockup {
    font-size: 16px;
  }

  .brand-icon {
    width: 48px;
    height: 20px;
  }

  .site-nav a {
    min-height: 30px;
    padding: 7px 9px;
  }

  .hero {
    min-height: 88svh;
    padding: 84px 20px 58px;
  }

  .hero-title {
    font-size: 54px;
  }

  .hero-copy {
    margin-top: 22px;
    font-size: 18px;
  }

  .hero-actions,
  .closing-actions {
    gap: 10px;
    margin-top: 28px;
  }

  .primary-action {
    min-height: 42px;
    padding: 11px 17px;
    font-size: 14px;
  }

  .hero-stage {
    margin-top: 36px;
    padding: 22px 0 18px;
  }

  .notch-shot {
    width: min(360px, 88%);
  }

  .preview-band {
    padding: 12px 20px 58px;
  }

  .preview-inner article {
    padding: 20px;
  }

  .preview-inner strong {
    font-size: 17px;
  }

  .story-pin {
    width: calc(100% - 40px);
    padding-top: 64px;
  }

  .story-copy h2 {
    font-size: 38px;
  }

  .mobile-steps {
    width: calc(100% - 40px);
    gap: 24px;
  }

  .mobile-step {
    padding: 14px;
  }

  .mobile-step h3 {
    font-size: 30px;
  }

  .mobile-step p {
    font-size: 17px;
  }

  .more-features {
    padding: 72px 20px 82px;
  }

  .more-inner > h2 {
    font-size: 38px;
  }

  .feature-stack {
    gap: 22px;
  }

  .feature-row {
    padding: 14px;
  }

  .feature-copy {
    padding: 24px 20px;
  }

  .feature-copy h3 {
    font-size: 30px;
  }

  .feature-copy p {
    font-size: 17px;
  }

  .closing {
    padding: 86px 20px 100px;
  }

  .closing h2 {
    font-size: 44px;
  }

  .closing-brand {
    margin-bottom: 14px;
    font-size: 68px;
  }

  .closing p:not(.eyebrow) {
    font-size: 18px;
  }
}

/* ===== Hero 氛围层：iOS 风光晕 + 漂浮粒子 ===== */
.hero-aura {
  position: absolute;
  inset: -12% -6%;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  filter: saturate(112%);
}

.aura-blob {
  position: absolute;
  width: 48vw;
  height: 48vw;
  max-width: 660px;
  max-height: 660px;
  border-radius: 50%;
  opacity: 0.5;
  will-change: transform;
  animation: aura-drift 24s ease-in-out infinite;
}

.aura-blob-blue {
  top: -10%;
  left: -8%;
  background: radial-gradient(circle at 50% 50%, rgba(52, 120, 246, 0.52), rgba(52, 120, 246, 0) 68%);
  animation-duration: 26s;
}

.aura-blob-green {
  top: 18%;
  right: -12%;
  background: radial-gradient(circle at 50% 50%, rgba(41, 200, 105, 0.44), rgba(41, 200, 105, 0) 68%);
  animation-duration: 30s;
  animation-delay: -7s;
}

.aura-blob-amber {
  bottom: -20%;
  left: 26%;
  background: radial-gradient(circle at 50% 50%, rgba(245, 165, 36, 0.42), rgba(245, 165, 36, 0) 68%);
  animation-duration: 34s;
  animation-delay: -14s;
}

@keyframes aura-drift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
  }
  33% {
    transform: translate3d(6%, 4%, 0) scale(1.08);
  }
  66% {
    transform: translate3d(-5%, 7%, 0) scale(0.95);
  }
  100% {
    transform: translate3d(0, 0, 0) scale(1);
  }
}

.hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* 标题流光：深色基底上极缓慢扫过的金属高光 */
.hero-title span {
  background-image: linear-gradient(
    100deg,
    var(--text) 0%,
    var(--text) 40%,
    #59626e 48%,
    var(--text) 58%,
    var(--text) 100%
  );
  background-size: 220% 100%;
  background-position: 130% 0;
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: title-sheen 8s ease-in-out 1.2s infinite;
}

@keyframes title-sheen {
  0%,
  20% {
    background-position: 130% 0;
  }
  62%,
  100% {
    background-position: -42% 0;
  }
}

/* 收起态截图：柔和浮动 + 发光底座 */
.hero-stage {
  position: relative;
}

.hero-stage::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 40%;
  z-index: 0;
  width: min(440px, 74%);
  height: 150px;
  transform: translate(-50%, -50%);
  background: radial-gradient(ellipse at center, rgba(52, 120, 246, 0.18), rgba(52, 120, 246, 0) 70%);
  filter: blur(22px);
  pointer-events: none;
  animation: stage-glow 6.5s ease-in-out infinite;
}

.notch-shot {
  position: relative;
  z-index: 1;
  animation: notch-float 6.5s ease-in-out infinite;
  will-change: transform;
}

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

@keyframes stage-glow {
  0%,
  100% {
    opacity: 0.7;
    transform: translate(-50%, -50%) scale(1);
  }
  50% {
    opacity: 1;
    transform: translate(-50%, -50%) scale(1.06);
  }
}

/* 状态点：信号脉冲呼吸 */
.status-dot {
  position: relative;
}

.status-dot::after {
  content: "";
  position: absolute;
  inset: -4px;
  border-radius: 999px;
  background: inherit;
  opacity: 0;
  animation: dot-pulse 2.6s ease-out infinite;
}

.blue::after {
  animation-delay: 0s;
}

.green::after {
  animation-delay: 0.55s;
}

.amber::after {
  animation-delay: 1.1s;
}

@keyframes dot-pulse {
  0% {
    opacity: 0.55;
    transform: scale(0.6);
  }
  70%,
  100% {
    opacity: 0;
    transform: scale(2.1);
  }
}

/* 主按钮：hover 光泽扫过 */
.primary-action {
  position: relative;
  overflow: hidden;
}

.primary-action::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, transparent 28%, rgba(255, 255, 255, 0.28) 50%, transparent 72%);
  transform: translateX(-130%);
  transition: transform 620ms ease;
  pointer-events: none;
}

.primary-action:hover::after,
.primary-action:focus-visible::after {
  transform: translateX(130%);
}

/* 全局飘浮粒子层：覆盖整页、淡，作为统一氛围基调 */
.page-particles {
  position: fixed;
  inset: 0;
  z-index: 3;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* 尾页氛围：与首屏同强度的光晕 + 粒子 */
.closing {
  position: relative;
  isolation: isolate;
  overflow: hidden;
}

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

.closing-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

@media (prefers-reduced-motion: reduce) {
  .aura-blob,
  .hero-title span,
  .hero-stage::before,
  .notch-shot,
  .status-dot::after,
  .primary-action::after {
    animation: none !important;
    transition: none !important;
  }

  .hero-title span {
    -webkit-text-fill-color: var(--text);
  }

  .hero-particles,
  .page-particles,
  .closing-particles {
    display: none;
  }
}