:root {
  --ink: #16223a;
  --ink-soft: #34415b;
  --paper: #f7f9fc;
  --white: #ffffff;
  --line: #dce2ea;
  --coral: #e94f4a;
  --coral-dark: #c83d3a;
  --teal: #20b7a7;
  --teal-dark: #0d7f76;
  --gold: #ffd35a;
  --muted: #6b7486;
  --shadow: 0 18px 50px rgba(22, 34, 58, 0.12);
  --content: 1180px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑", Arial, Helvetica, sans-serif;
  line-height: 1.75;
  letter-spacing: 0;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
a {
  -webkit-tap-highlight-color: transparent;
}

button,
input {
  font: inherit;
}

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

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 1000;
  padding: 8px 12px;
  color: var(--white);
  background: var(--ink);
  transform: translateY(-150%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  border-bottom: 1px solid rgba(220, 226, 234, 0.86);
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(14px);
}

.nav-wrap {
  width: min(calc(100% - 40px), var(--content));
  min-height: 72px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 19px;
  font-weight: 800;
  white-space: nowrap;
}

.brand img {
  width: 42px;
  height: 42px;
  border-radius: 8px;
}

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

.site-nav a {
  min-height: 42px;
  padding: 8px 14px;
  border-radius: 6px;
  color: var(--ink-soft);
  font-size: 15px;
  font-weight: 650;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--coral-dark);
  background: #fff0ef;
}

.nav-download,
.button-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 11px 24px;
  border: 1px solid var(--coral);
  border-radius: 6px;
  color: var(--white) !important;
  background: var(--coral) !important;
  box-shadow: 4px 4px 0 var(--ink);
  font-weight: 800;
  transition: transform 160ms ease, box-shadow 160ms ease, background 160ms ease;
}

.nav-download {
  min-height: 40px;
  padding: 7px 16px !important;
  box-shadow: 3px 3px 0 var(--ink);
}

.nav-download:hover,
.button-primary:hover {
  background: var(--coral-dark) !important;
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--ink);
}

.menu-toggle {
  display: none;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--white);
  cursor: pointer;
}

.menu-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  margin: 4px auto;
  background: var(--ink);
}

.container {
  width: min(calc(100% - 40px), var(--content));
  margin: 0 auto;
}

.hero {
  position: relative;
  overflow: hidden;
  min-height: 650px;
  color: var(--white);
  background: var(--ink);
}

.hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: -8%;
  width: 48%;
  height: 100%;
  border-left: 1px solid rgba(255, 255, 255, 0.14);
  background: #21304d;
  opacity: 0.72;
  transform: skewX(-8deg);
  transform-origin: bottom right;
}

.hero::after {
  content: "ON AIR";
  position: absolute;
  right: -12px;
  bottom: -48px;
  color: transparent;
  -webkit-text-stroke: 2px rgba(255, 255, 255, 0.16);
  font-size: 132px;
  font-weight: 900;
  line-height: 1;
  pointer-events: none;
}

.hero-grid {
  position: relative;
  z-index: 1;
  min-height: 650px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(440px, 0.84fr);
  align-items: center;
  gap: 70px;
  padding: 78px 0 68px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 18px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 800;
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 4px;
  background: var(--teal);
}

.hero h1,
.page-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 5vw, 72px);
  line-height: 1.12;
  letter-spacing: 0;
}

.hero-copy > p {
  max-width: 700px;
  margin: 24px 0 0;
  color: #d8dfea;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 32px;
}

.hero-meta {
  color: #aeb9ca;
  font-size: 14px;
}

.phone-stage {
  position: relative;
  min-height: 510px;
}

.phone {
  position: absolute;
  overflow: hidden;
  width: 252px;
  aspect-ratio: 318 / 565;
  border: 7px solid #0b1222;
  border-radius: 30px;
  background: #0b1222;
  box-shadow: var(--shadow);
}

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

.phone-main {
  z-index: 2;
  right: 10px;
  top: 0;
  transform: rotate(3deg);
}

.phone-back {
  z-index: 1;
  left: 8px;
  top: 74px;
  transform: rotate(-6deg);
}

.signal-tag {
  position: absolute;
  z-index: 3;
  left: 44px;
  bottom: 4px;
  padding: 8px 14px;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--gold);
  font-weight: 900;
  transform: rotate(-3deg);
}

.trust-strip {
  width: 100%;
  display: flex;
  justify-content: center;
  border-bottom: 1px solid var(--line);
  background: var(--white);
}

.trust-list {
  width: min(calc(100% - 40px), var(--content));
  min-height: 92px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  align-items: stretch;
  margin: 0 auto;
  padding: 0;
  list-style: none;
}

.trust-list li {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 8px 24px;
  border-right: 1px solid var(--line);
  text-align: center;
}

.trust-list li:first-child {
  border-left: 1px solid var(--line);
}

.trust-list strong {
  display: block;
  color: var(--coral-dark);
  font-size: 22px;
  line-height: 1.3;
}

.trust-list span {
  color: var(--muted);
  font-size: 13px;
}

.section {
  padding: 90px 0;
}

.section-compact {
  padding: 68px 0;
}

.section-dark {
  color: var(--white);
  background: var(--ink);
}

.section-teal {
  background: #dff7f2;
}

.section-white {
  background: var(--white);
}

.section-kicker {
  margin-bottom: 8px;
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 900;
  text-transform: uppercase;
}

.section-dark .section-kicker {
  color: var(--gold);
}

.section h2,
.section-compact h2 {
  max-width: 760px;
  margin: 0 0 36px;
  font-size: clamp(30px, 4vw, 48px);
  line-height: 1.2;
  letter-spacing: 0;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.feature-item {
  min-height: 250px;
  padding: 34px;
  background: var(--white);
}

.feature-number {
  display: inline-flex;
  width: 44px;
  height: 44px;
  align-items: center;
  justify-content: center;
  margin-bottom: 26px;
  border: 2px solid var(--ink);
  color: var(--ink);
  background: var(--gold);
  font-weight: 900;
}

.feature-item:nth-child(2n) .feature-number {
  color: var(--white);
  background: var(--teal);
}

.feature-item h3 {
  margin: 0 0 10px;
  font-size: 21px;
}

.feature-item p {
  margin: 0;
  color: var(--muted);
}

.showcase-head {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 34px;
}

.showcase-head h2 {
  margin-bottom: 0;
}

.slider-controls {
  display: flex;
  gap: 8px;
}

.slider-button {
  width: 44px;
  height: 44px;
  border: 1px solid #50607c;
  border-radius: 6px;
  color: var(--white);
  background: transparent;
  font-size: 27px;
  line-height: 1;
  cursor: pointer;
}

.slider-button:hover {
  color: var(--ink);
  background: var(--gold);
}

.shot-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(240px, 318px);
  gap: 24px;
  overflow-x: auto;
  padding: 0 0 20px;
  scroll-snap-type: x mandatory;
  scrollbar-color: var(--teal) #33415c;
}

.shot {
  width: 100%;
  scroll-snap-align: start;
}

.shot img {
  width: 100%;
  max-width: 318px;
  height: auto;
  border: 6px solid #0b1222;
  border-radius: 24px;
}

.shot figcaption {
  margin-top: 12px;
  color: #c7d0dd;
  font-size: 14px;
}

.route-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.route-card {
  position: relative;
  min-height: 330px;
  padding: 38px;
  border: 2px solid var(--ink);
  border-radius: 8px;
  background: var(--white);
  box-shadow: 8px 8px 0 var(--ink);
}

.route-card:nth-child(2) {
  background: var(--gold);
}

.route-label {
  color: var(--coral-dark);
  font-size: 13px;
  font-weight: 900;
}

.route-card h3 {
  max-width: 430px;
  margin: 18px 0 14px;
  font-size: 30px;
  line-height: 1.25;
}

.route-card p {
  max-width: 500px;
  margin: 0;
  color: var(--ink-soft);
}

.text-link {
  position: absolute;
  right: 36px;
  bottom: 32px;
  border-bottom: 2px solid var(--coral);
  color: var(--coral-dark);
  font-weight: 900;
}

.review-grid {
  display: grid;
  grid-template-columns: 0.75fr 1.25fr;
  gap: 42px;
  align-items: start;
}

.score-panel {
  padding: 34px;
  border: 2px solid var(--ink);
  background: var(--gold);
  box-shadow: 7px 7px 0 var(--coral);
}

.score-value {
  display: block;
  font-size: 66px;
  font-weight: 900;
  line-height: 1;
}

.score-panel span:last-child {
  display: block;
  margin-top: 12px;
  font-weight: 750;
}

.review-list {
  display: grid;
  gap: 16px;
}

.review-list blockquote {
  margin: 0;
  padding: 24px 0;
  border-top: 1px solid var(--line);
  font-size: 17px;
}

.review-list blockquote:last-child {
  border-bottom: 1px solid var(--line);
}

.review-list cite {
  display: block;
  margin-top: 10px;
  color: var(--muted);
  font-size: 13px;
  font-style: normal;
}

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

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

.faq-question {
  width: 100%;
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 16px 2px;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  font-weight: 800;
  cursor: pointer;
}

.faq-question::after {
  content: "+";
  flex: 0 0 30px;
  color: var(--coral-dark);
  font-size: 28px;
  text-align: center;
}

.faq-question[aria-expanded="true"]::after {
  content: "−";
}

.faq-answer {
  max-width: 880px;
  padding: 0 48px 20px 2px;
  color: var(--ink-soft);
}

.faq-answer p {
  margin: 0;
}

.more-row {
  margin-top: 30px;
}

.inline-link {
  color: var(--coral-dark);
  border-bottom: 1px solid currentColor;
  font-weight: 800;
}

.download-band {
  color: var(--white);
  background: var(--coral);
}

.download-layout {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 36px;
  align-items: center;
}

.download-layout h2 {
  margin: 0;
  color: var(--white);
}

.download-layout .button-primary {
  border-color: var(--white);
  color: var(--ink) !important;
  background: var(--gold) !important;
}

.page-hero {
  position: relative;
  overflow: hidden;
  padding: 96px 0 88px;
  color: var(--white);
  background: var(--ink);
}

.page-hero::after {
  content: attr(data-mark);
  position: absolute;
  right: 4%;
  bottom: -26px;
  color: transparent;
  -webkit-text-stroke: 2px rgba(255, 255, 255, 0.12);
  font-size: 118px;
  font-weight: 900;
  line-height: 1;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero p {
  max-width: 760px;
  margin: 22px 0 0;
  color: #d5dcea;
  font-size: 18px;
}

.page-hero h1 {
  max-width: 920px;
  font-size: clamp(36px, 4.2vw, 60px);
  overflow-wrap: anywhere;
}

.breadcrumbs {
  margin-bottom: 22px;
  color: #9fabc0;
  font-size: 13px;
}

.breadcrumbs a {
  color: var(--gold);
}

.content-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 280px;
  gap: 58px;
  align-items: start;
}

.article-section {
  margin-bottom: 68px;
  scroll-margin-top: 96px;
}

.article-section h2 {
  margin: 0 0 24px;
  font-size: 32px;
  line-height: 1.3;
}

.article-section h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.article-section p {
  margin: 0 0 16px;
  color: var(--ink-soft);
}

.step-list {
  counter-reset: steps;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line);
  background: var(--line);
}

.step-item {
  position: relative;
  min-height: 178px;
  padding: 30px 30px 30px 98px;
  background: var(--white);
}

.step-item::before {
  counter-increment: steps;
  content: counter(steps, decimal-leading-zero);
  position: absolute;
  top: 30px;
  left: 28px;
  color: var(--coral-dark);
  font-size: 24px;
  font-weight: 900;
}

.step-item ul,
.check-list,
.plain-list {
  margin: 12px 0 0;
  padding-left: 20px;
  color: var(--ink-soft);
}

.step-item li,
.check-list li,
.plain-list li {
  margin-bottom: 7px;
}

.note-box {
  padding: 24px 26px;
  border-left: 6px solid var(--teal);
  background: #e7f8f5;
}

.note-box strong {
  display: block;
  margin-bottom: 6px;
}

.note-box p:last-child {
  margin-bottom: 0;
}

.article-shot {
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 34px;
  align-items: center;
  margin-top: 28px;
}

.article-shot img {
  width: 100%;
  max-width: 318px;
  height: auto;
  border: 5px solid var(--ink);
  border-radius: 22px;
}

.article-shot figcaption {
  color: var(--ink-soft);
}

.toc {
  position: sticky;
  top: 96px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--white);
}

.toc strong {
  display: block;
  margin-bottom: 12px;
}

.toc a {
  display: block;
  padding: 7px 0;
  color: var(--muted);
  font-size: 14px;
}

.toc a:hover {
  color: var(--coral-dark);
}

.info-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--white);
}

.info-table th,
.info-table td {
  padding: 16px 18px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.info-table th {
  width: 26%;
  background: #eef2f7;
}

.feature-detail-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.detail-item {
  min-height: 220px;
  padding: 26px;
  border: 1px solid var(--line);
  background: var(--white);
}

.detail-item b {
  display: block;
  margin-bottom: 10px;
  color: var(--coral-dark);
  font-size: 14px;
}

.detail-item p:last-child {
  margin-bottom: 0;
}

.site-footer {
  padding: 48px 0 28px;
  color: #c9d1de;
  background: #0d1629;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.3fr 0.7fr 0.7fr;
  gap: 44px;
}

.footer-brand {
  color: var(--white);
}

.footer-copy {
  max-width: 500px;
  margin: 14px 0 0;
  color: #9faabd;
  font-size: 14px;
}

.footer-links strong {
  display: block;
  margin-bottom: 10px;
  color: var(--white);
}

.footer-links a {
  display: block;
  padding: 4px 0;
  color: #aeb8c8;
}

.footer-links a:hover {
  color: var(--gold);
}

.disclaimer {
  margin: 36px 0 0;
  padding-top: 22px;
  border-top: 1px solid #2a3549;
  color: #8f9bae;
  font-size: 13px;
}

.copyright {
  margin: 8px 0 0;
  color: #717e92;
  font-size: 12px;
}

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 500ms ease, transform 500ms ease;
}

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

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

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

@media (max-width: 980px) {
  .menu-toggle {
    display: block;
  }

  .site-nav {
    position: fixed;
    inset: 72px 0 auto;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 18px 20px 24px;
    border-bottom: 1px solid var(--line);
    background: var(--white);
    box-shadow: var(--shadow);
  }

  .site-nav.is-open {
    display: flex;
  }

  .site-nav a {
    display: flex;
    align-items: center;
  }

  .nav-download {
    margin-top: 8px;
  }

  .hero-grid {
    grid-template-columns: 1fr;
    gap: 30px;
    padding-bottom: 30px;
  }

  .phone-stage {
    width: min(100%, 540px);
    margin: 0 auto;
  }

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

  .content-shell {
    grid-template-columns: 1fr;
  }

  .toc {
    position: static;
    order: -1;
  }
}

@media (max-width: 720px) {
  .container,
  .nav-wrap {
    width: min(calc(100% - 28px), var(--content));
  }

  .brand {
    font-size: 17px;
  }

  .brand img {
    width: 38px;
    height: 38px;
  }

  .hero,
  .hero-grid {
    min-height: auto;
  }

  .hero-grid {
    padding-top: 58px;
  }

  .hero h1,
  .page-hero h1 {
    font-size: 40px;
  }

  .hero-copy > p,
  .page-hero p {
    font-size: 16px;
  }

  .phone-stage {
    min-height: 420px;
  }

  .phone {
    width: 205px;
    border-width: 5px;
    border-radius: 23px;
  }

  .phone-main {
    right: 0;
  }

  .phone-back {
    left: 0;
    top: 56px;
  }

  .trust-list {
    grid-template-columns: 1fr 1fr;
  }

  .trust-list li:nth-child(3) {
    border-left: 1px solid var(--line);
  }

  .section {
    padding: 66px 0;
  }

  .section-compact {
    padding: 52px 0;
  }

  .section h2,
  .section-compact h2 {
    margin-bottom: 28px;
    font-size: 32px;
  }

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

  .feature-item {
    min-height: auto;
  }

  .route-card {
    min-height: 350px;
    padding: 28px;
  }

  .route-card h3 {
    font-size: 26px;
  }

  .download-layout {
    grid-template-columns: 1fr;
  }

  .download-layout .button-primary {
    width: 100%;
  }

  .page-hero {
    padding: 70px 0 64px;
  }

  .page-hero::after {
    font-size: 76px;
  }

  .article-section h2 {
    font-size: 28px;
  }

  .step-item {
    padding: 76px 24px 26px;
  }

  .step-item::before {
    top: 22px;
    left: 24px;
  }

  .article-shot {
    grid-template-columns: 1fr;
  }

  .article-shot img {
    margin: 0 auto;
  }

  .info-table,
  .info-table tbody,
  .info-table tr,
  .info-table th,
  .info-table td {
    display: block;
    width: 100%;
  }

  .info-table th {
    border-bottom: 0;
  }
}

@media (max-width: 420px) {
  .hero h1 {
    font-size: 34px;
  }

  .page-hero h1 {
    font-size: 32px;
  }

  .phone-stage {
    min-height: 356px;
  }

  .phone {
    width: 166px;
  }

  .phone-back {
    top: 46px;
  }

  .signal-tag {
    left: 10px;
    bottom: 0;
  }
}