:root {
  --theme: #00a1a1;
  --theme-light: #59c2c2;
  --theme-deep: #007e7e;
  --banner-ink: #ffffff;
  --banner-muted: rgba(255, 255, 255, 0.9);
  --text-primary: #12202b;
  --text-secondary: #4d5d6a;
  --text-muted: #7b8791;
  --surface: #ffffff;
  --line: rgba(0, 161, 161, 0.2);
  --shadow: 0 0.14rem 0.4rem rgba(0, 100, 100, 0.12);
  --page-bg: #f3f8f8;
  --font-sans: "PingFang SC", "Hiragino Sans GB", "Noto Sans SC", "Microsoft YaHei", sans-serif;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

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

body.page--steps {
  position: relative;
  min-height: 100%;
  font-family: var(--font-sans);
  font-weight: 400;
  line-height: 1.6;
  letter-spacing: 0.01em;
  color: var(--text-primary);
  overflow-x: hidden;
  background:
    radial-gradient(ellipse 50% 36% at 0% 0%, rgba(0, 161, 161, 0.1), transparent 55%),
    linear-gradient(180deg, #eaf6f6 0%, var(--page-bg) 48%, #f7fafc 100%);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

.page-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.45;
  background:
    radial-gradient(circle at 90% 20%, rgba(0, 161, 161, 0.07), transparent 40%),
    radial-gradient(circle at 10% 80%, rgba(0, 126, 126, 0.06), transparent 42%);
}

.header,
.layout,
.copyright {
  position: relative;
  z-index: 1;
}

/* —— Header: sticky + teal left accent bar —— */
.header {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.94);
  border-bottom: 1px solid rgba(0, 161, 161, 0.12);
  border-left: 0.08rem solid var(--theme);
  box-shadow: 0 0.04rem 0.18rem rgba(0, 80, 80, 0.06);
  animation: fade-down 0.5s ease-out both;
}

.header__inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.16rem 0.28rem;
}

.company {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  color: var(--theme-deep);
}

.company__name {
  font-size: 0.22rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.3;
}

.nav {
  display: flex;
  align-items: center;
  gap: 0.28rem;
  font-size: 0.16rem;
  font-weight: 500;
  letter-spacing: 0.08em;
}

.nav .active {
  color: var(--theme);
  font-weight: 700;
  position: relative;
}

.nav .active::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -0.06rem;
  height: 0.03rem;
  background: var(--theme);
}

.nav a {
  color: var(--text-primary);
  transition: color 0.25s ease;
}

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

/* —— Hero: phone left / text right + angled clip —— */
.banner {
  position: relative;
  width: 100%;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(ellipse 40% 55% at 18% 30%, rgba(255, 255, 255, 0.28), transparent 58%),
    linear-gradient(135deg, #33b3b3 0%, var(--theme) 48%, var(--theme-deep) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
  -webkit-clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.banner__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  background:
    radial-gradient(circle at 75% 40%, rgba(255, 255, 255, 0.2), transparent 45%),
    linear-gradient(180deg, transparent 70%, rgba(0, 80, 80, 0.12) 100%);
}

.appContent {
  position: relative;
  z-index: 3;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.28rem;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.42rem 0.28rem 0.72rem;
}

.phonePic-wrap {
  flex: 0 1 42%;
  max-width: 3.4rem;
  animation: fade-up 0.65s ease-out both;
}

.phonePic {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.16rem;
  filter: drop-shadow(0 0.2rem 0.36rem rgba(0, 60, 60, 0.35));
  animation: phone-float 5s ease-in-out infinite;
}

.banner-desc {
  flex: 1 1 48%;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  color: var(--banner-ink);
  animation: fade-up 0.65s ease-out 0.1s both;
}

.banner-tag {
  font-size: 0.14rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.82);
  margin-bottom: 0.14rem;
}

.appName {
  font-size: 0.58rem;
  font-weight: 800;
  line-height: 1.15;
  letter-spacing: 0.08em;
  color: var(--banner-ink);
  margin-bottom: 0.14rem;
  text-shadow: 0 0.04rem 0.16rem rgba(0, 60, 60, 0.2);
}

.appDesc {
  font-size: 0.22rem;
  color: var(--banner-muted);
  letter-spacing: 0.08em;
  line-height: 1.55;
}

.download-link {
  display: inline-block;
  margin-top: 0.28rem;
}

.download {
  position: relative;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 2.2rem;
  padding: 0.14rem 0.36rem;
  font-size: 0.18rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--theme-deep);
  background: #fff;
  border-radius: 0.06rem;
  box-shadow: 0 0.08rem 0.22rem rgba(0, 60, 60, 0.2);
  overflow: hidden;
  transition: transform 0.25s ease, box-shadow 0.25s ease, background 0.25s ease;
  animation: download-pulse 2.4s ease-in-out infinite;
}

.download::after {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 55%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(255, 255, 255, 0.75), transparent);
  transform: skewX(-20deg);
  pointer-events: none;
}

.download-link:hover .download {
  background: #f2fbfb;
  transform: translateY(-0.04rem) scale(1.03);
  box-shadow: 0 0.14rem 0.32rem rgba(0, 60, 60, 0.32);
  animation: none;
}

.download-link:hover .download::after {
  animation: download-shine 0.75s ease;
}

/* —— Features: numbered STEP rows (no reverse) —— */
.appInfo {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.56rem 0.28rem 0.64rem;
}

.section-head {
  text-align: left;
  margin-bottom: 0.36rem;
}

.section-title {
  font-size: 0.34rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  color: var(--text-primary);
  position: relative;
  padding-left: 0.16rem;
}

.section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.08rem;
  bottom: 0.08rem;
  width: 0.06rem;
  background: var(--theme);
  border-radius: 0.03rem;
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 0.22rem;
  position: relative;
}

.feature-list::before {
  content: "";
  position: absolute;
  left: 0.18rem;
  top: 0.2rem;
  bottom: 0.2rem;
  width: 0.02rem;
  background: linear-gradient(180deg, var(--theme-light), rgba(0, 161, 161, 0.15));
  pointer-events: none;
}

.item {
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: 0.28rem;
  padding: 0.2rem 0.24rem 0.2rem 0.42rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.1rem;
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateX(-0.16rem);
  transition: opacity 0.55s ease, transform 0.55s ease, box-shadow 0.3s ease;
}

.item.is-visible {
  opacity: 1;
  transform: translateX(0);
}

.item:nth-child(2).is-visible {
  transition-delay: 0.06s;
}

.item:nth-child(3).is-visible {
  transition-delay: 0.12s;
}

.item:nth-child(4).is-visible {
  transition-delay: 0.18s;
}

.item:hover {
  box-shadow: 0 0.18rem 0.44rem rgba(0, 100, 100, 0.16);
}

.item__media {
  flex: 0 0 32%;
  width: 32%;
  max-width: 32%;
  overflow: hidden;
  border-radius: 0.14rem;
  background: linear-gradient(160deg, #e6f6f6, #d4efef);
}

.item__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 0.14rem;
  transition: transform 0.35s ease;
}

.item:hover .item__media img {
  transform: scale(1.03);
}

.function-desc {
  flex: 1 1 auto;
  min-width: 0;
  position: relative;
  padding: 0.06rem 0.1rem 0.06rem 0;
}

.feature-index {
  display: block;
  font-size: 0.48rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: 0.04em;
  color: rgba(0, 161, 161, 0.18);
  margin-bottom: 0.06rem;
}

.function-desc h2 {
  font-size: 0.28rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--text-primary);
  margin-bottom: 0.08rem;
  line-height: 1.35;
  transition: color 0.25s ease;
}

.item:hover .function-desc h2 {
  color: var(--theme-deep);
}

.function-desc p {
  font-size: 0.18rem;
  color: var(--text-secondary);
  letter-spacing: 0.04em;
  line-height: 1.65;
}

/* —— Contact dual cards —— */
.contact {
  margin-top: 0.46rem;
  opacity: 0;
  transform: translateY(0.18rem);
  transition: opacity 0.55s ease, transform 0.55s ease;
}

.contact.is-visible {
  opacity: 1;
  transform: translateY(0);
}

.contact-panel--cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.24rem;
  padding: 0;
  background: transparent;
  border: none;
  box-shadow: none;
  border-radius: 0;
}

.contact-card {
  padding: 0.26rem 0.28rem;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 0.1rem;
  box-shadow: var(--shadow);
  transition: box-shadow 0.3s ease, border-color 0.3s ease;
}

.contact-card:hover {
  border-color: rgba(0, 161, 161, 0.4);
  box-shadow: 0 0.16rem 0.4rem rgba(0, 100, 100, 0.14);
}

.contact-card__head {
  display: flex;
  align-items: center;
  gap: 0.1rem;
  margin-bottom: 0.1rem;
}

.contact-card__label {
  font-size: 0.18rem;
  font-weight: 600;
  color: var(--theme-deep);
  letter-spacing: 0.04em;
}

.contact-card__value {
  margin: 0;
  padding-left: 0.34rem;
  font-size: 0.16rem;
  line-height: 1.7;
  color: var(--text-secondary);
  word-break: break-all;
}

.contact-icon {
  width: 0.24rem;
  height: 0.24rem;
  flex-shrink: 0;
  background-color: var(--theme);
  -webkit-mask-size: contain;
  mask-size: contain;
  -webkit-mask-repeat: no-repeat;
  mask-repeat: no-repeat;
  -webkit-mask-position: center;
  mask-position: center;
}

.contact-icon--pin {
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5A2.5 2.5 0 1 1 12 6a2.5 2.5 0 0 1 0 5.5z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7zm0 9.5A2.5 2.5 0 1 1 12 6a2.5 2.5 0 0 1 0 5.5z'/%3E%3C/svg%3E");
}

.contact-icon--mail {
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4-8 5L4 8V6l8 5 8-5v2z'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24'%3E%3Cpath fill='%23000' d='M20 4H4c-1.1 0-2 .9-2 2v12c0 1.1.9 2 2 2h16c1.1 0 2-.9 2-2V6c0-1.1-.9-2-2-2zm0 4-8 5L4 8V6l8 5 8-5v2z'/%3E%3C/svg%3E");
}

/* —— Footer stacked —— */
.copyright {
  display: flex;
  width: 100%;
  justify-content: center;
  align-items: center;
  padding: 0.2rem 0.2rem;
  background: #2c2d33;
}

.copyright-inner {
  display: inline-flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.1rem 0.14rem;
  font-size: 0.13rem;
  letter-spacing: 0.02em;
  color: #fff;
  line-height: 1.7;
}

.copyright-inner--stack {
  flex-direction: column;
  gap: 0.06rem;
  text-align: center;
}

.copyright-line {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.08rem;
}

.copyright a {
  color: #fff;
  transition: color 0.25s ease, opacity 0.25s ease;
}

.copyright a:hover {
  color: var(--theme-light);
  opacity: 0.95;
}

.beian-link {
  display: inline-flex;
  align-items: center;
  gap: 0.06rem;
}

.copyright-img {
  width: 0.18rem;
  height: 0.18rem;
  display: block;
  object-fit: contain;
  border-radius: 0.04rem;
}

@keyframes download-pulse {
  0%,
  100% {
    transform: translateY(0) scale(1);
    box-shadow: 0 0.08rem 0.22rem rgba(0, 60, 60, 0.2);
  }
  50% {
    transform: translateY(-0.02rem) scale(1.02);
    box-shadow: 0 0.12rem 0.3rem rgba(0, 60, 60, 0.32);
  }
}

@keyframes download-shine {
  from {
    left: -120%;
  }
  to {
    left: 140%;
  }
}

@keyframes fade-down {
  from {
    opacity: 0;
    transform: translateY(-0.14rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fade-up {
  from {
    opacity: 0;
    transform: translateY(0.2rem);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes phone-float {
  0%,
  100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-0.06rem);
  }
}

@media (max-width: 768px) {
  .header {
    border-left-width: 0.06rem;
  }

  .header__inner {
    padding: 0.14rem 0.18rem;
  }

  .company__name {
    font-size: 0.18rem;
  }

  .nav {
    font-size: 0.14rem;
    gap: 0.16rem;
  }

  .banner {
    clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
    -webkit-clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
  }

  .appContent {
    flex-direction: column;
    text-align: center;
    padding: 0.32rem 0.18rem 0.56rem;
    gap: 0.16rem;
  }

  .phonePic-wrap {
    width: 72%;
    max-width: 320px;
    order: 2;
  }

  .banner-desc {
    align-items: center;
    order: 1;
    width: 100%;
  }

  .appName {
    font-size: 0.46rem;
  }

  .appDesc {
    font-size: 0.2rem;
  }

  .appInfo {
    padding: 0.4rem 0.18rem 0.48rem;
  }

  .section-title {
    font-size: 0.28rem;
  }

  .feature-list::before {
    display: none;
  }

  .item {
    flex-direction: column;
    align-items: stretch;
    padding: 0.16rem;
    gap: 0.14rem;
    transform: translateY(0.16rem);
  }

  .item.is-visible {
    transform: translateY(0);
  }

  .item__media {
    flex: none;
    width: 100%;
    max-width: none;
  }

  .function-desc {
    text-align: left;
    padding: 0.04rem 0.06rem 0.08rem;
  }

  .feature-index {
    font-size: 0.4rem;
  }

  .function-desc h2 {
    font-size: 0.24rem;
  }

  .contact-panel--cards {
    grid-template-columns: 1fr;
    gap: 0.18rem;
  }

  .contact-card {
    padding: 0.22rem 0.2rem;
  }
}