:root {
  --ink: #f7f8fc;
  --muted: #aeb6c8;
  --night: #101424;
  --night-2: #171c30;
  --panel: #20263b;
  --cyan: #12c8d0;
  --gold: #f4c95d;
  --coral: #ff746c;
  --line: rgba(255, 255, 255, 0.12);
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.26);
  --radius: 8px;
  --max: 1160px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--night);
  font-family: "Microsoft YaHei", "PingFang SC", Arial, sans-serif;
  line-height: 1.75;
}

body.menu-open {
  overflow: hidden;
}

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

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

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

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  border-bottom: 1px solid var(--line);
  background: rgba(16, 20, 36, 0.94);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  min-height: 72px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-weight: 800;
  font-size: 19px;
  white-space: nowrap;
}

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

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 8px 12px;
  color: var(--muted);
  font-size: 15px;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--ink);
}

.nav-download,
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: var(--cyan);
  color: #071315;
  font-weight: 800;
  box-shadow: 0 10px 26px rgba(18, 200, 208, 0.2);
  transition: transform 180ms ease, filter 180ms ease;
}

.nav-download {
  min-height: 40px;
  padding: 0 16px;
}

.button:hover,
.nav-download:hover {
  transform: translateY(-2px);
  filter: brightness(1.07);
}

.button.secondary {
  background: transparent;
  color: var(--ink);
  border-color: var(--line);
  box-shadow: none;
}

.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: transparent;
  font-size: 24px;
}

.hero {
  position: relative;
  min-height: 680px;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: #11172a;
}

.hero::after {
  content: "";
  position: absolute;
  inset: 0 42% 0 0;
  background: #101424;
  clip-path: polygon(0 0, 82% 0, 100% 100%, 0 100%);
}

.hero-preview {
  position: absolute;
  z-index: 1;
  top: 50%;
  right: 28%;
  width: min(24vw, 290px);
  max-width: 400px;
  height: auto;
  transform: translateY(-50%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(650px, 62%);
  padding: 88px 0 110px;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  color: var(--gold);
  font-size: 14px;
  font-weight: 700;
}

.eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--gold);
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 20px;
  font-size: clamp(42px, 7vw, 78px);
  line-height: 1.08;
  letter-spacing: 0;
}

.hero-lead {
  max-width: 600px;
  margin-bottom: 28px;
  color: #d4d9e6;
  font-size: 18px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 30px;
}

.facts {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  color: var(--muted);
  font-size: 14px;
}

.facts strong {
  display: block;
  color: var(--ink);
  font-size: 19px;
}

.section {
  padding: 88px 0;
}

.section.alt {
  background: #151a2c;
}

.section.light {
  color: #182032;
  background: #f4f6f9;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 36px;
}

.section-heading h2 {
  max-width: 760px;
  margin-bottom: 0;
  font-size: clamp(29px, 4vw, 46px);
  line-height: 1.2;
  letter-spacing: 0;
}

.section-kicker {
  color: var(--coral);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.feature-item {
  min-height: 240px;
  padding: 28px;
  background: var(--night);
}

.feature-index {
  display: block;
  margin-bottom: 34px;
  color: var(--gold);
  font-size: 13px;
  font-weight: 800;
}

.feature-item h3 {
  margin-bottom: 12px;
  font-size: 21px;
}

.feature-item p {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 15px;
}

.shot-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
  align-items: start;
}

.shot {
  margin: 0;
}

.shot img {
  width: 100%;
  max-width: 300px;
  height: auto;
  margin: 0 auto;
  border: 1px solid rgba(20, 30, 50, 0.14);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.shot figcaption {
  padding: 14px 4px 0;
  color: #526077;
  font-size: 14px;
}

.path-grid,
.review-grid,
.info-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.path-card,
.review,
.info-card {
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
}

.path-card h3,
.review h3,
.info-card h3 {
  margin-bottom: 10px;
  font-size: 20px;
}

.path-card p,
.review p,
.info-card p {
  margin-bottom: 18px;
  color: var(--muted);
}

.text-link {
  color: var(--cyan);
  font-weight: 700;
}

.text-link::after {
  content: "  →";
}

.review-stars {
  color: var(--gold);
  letter-spacing: 0;
}

.review cite {
  color: var(--muted);
  font-style: normal;
  font-size: 14px;
}

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

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

.faq-question {
  width: 100%;
  padding: 22px 48px 22px 0;
  border: 0;
  color: inherit;
  background: transparent;
  text-align: left;
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  position: relative;
}

.faq-question::after {
  content: "+";
  position: absolute;
  right: 4px;
  top: 18px;
  color: var(--cyan);
  font-size: 28px;
  font-weight: 400;
}

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

.faq-answer {
  display: none;
  max-width: 850px;
  padding: 0 0 22px;
  color: var(--muted);
}

.faq-answer.open {
  display: block;
}

.download-band {
  padding: 54px 0;
  background: var(--gold);
  color: #181506;
}

.download-band .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.download-band h2 {
  margin-bottom: 8px;
  font-size: clamp(28px, 4vw, 44px);
}

.download-band p {
  margin-bottom: 0;
}

.download-band .button {
  min-width: 154px;
  background: #151927;
  color: #fff;
  box-shadow: none;
}

.sub-hero {
  padding: 86px 0 70px;
  border-bottom: 1px solid var(--line);
  background: #151a2c;
}

.sub-hero h1 {
  max-width: 850px;
  margin-bottom: 18px;
  font-size: clamp(38px, 6vw, 66px);
}

.sub-hero p {
  max-width: 760px;
  margin-bottom: 0;
  color: var(--muted);
  font-size: 18px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 56px;
  align-items: start;
}

.article h2 {
  margin: 58px 0 22px;
  font-size: 31px;
  line-height: 1.3;
}

.article h2:first-child {
  margin-top: 0;
}

.article h3 {
  margin: 28px 0 10px;
  font-size: 21px;
}

.article p,
.article li {
  color: #c1c8d7;
}

.article ol,
.article ul {
  padding-left: 22px;
}

.step {
  display: grid;
  grid-template-columns: 50px 1fr;
  gap: 18px;
  padding: 24px 0;
  border-top: 1px solid var(--line);
}

.step-number {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--cyan);
  color: #071315;
  font-weight: 900;
}

.step h3 {
  margin-top: 4px;
}

.inline-shot {
  width: min(100%, 300px);
  max-width: 400px;
  margin: 20px 0;
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.side-nav {
  position: sticky;
  top: 98px;
  padding: 24px;
  border-left: 3px solid var(--gold);
  background: var(--panel);
}

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

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

.side-nav .button {
  margin-top: 16px;
  color: #071315;
}

.notice {
  padding: 18px 20px;
  border-left: 3px solid var(--coral);
  background: rgba(255, 116, 108, 0.08);
  color: #d6dbe7;
}

.site-footer {
  padding: 46px 0 30px;
  border-top: 1px solid var(--line);
  background: #0c0f1c;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 34px;
}

.site-footer h3 {
  margin-bottom: 12px;
  font-size: 16px;
}

.site-footer p,
.site-footer a {
  color: var(--muted);
  font-size: 14px;
}

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

.footer-bottom {
  padding-top: 22px;
  border-top: 1px solid var(--line);
  color: #8993a7;
  font-size: 13px;
}

@media (max-width: 920px) {
  .feature-grid,
  .shot-row {
    grid-template-columns: repeat(2, 1fr);
  }

  .path-grid,
  .review-grid,
  .info-grid {
    grid-template-columns: 1fr 1fr;
  }

  .hero {
    background: #11172a;
  }

  .hero::after {
    right: 25%;
  }

  .hero-content {
    width: 70%;
  }

  .hero-preview {
    right: 5%;
    width: min(27vw, 250px);
  }

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

  .side-nav {
    position: static;
  }
}

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

  .menu-toggle {
    display: grid;
    place-items: center;
  }

  .site-nav {
    display: none;
    position: fixed;
    inset: 72px 0 auto;
    padding: 22px 20px 28px;
    border-bottom: 1px solid var(--line);
    background: #101424;
    flex-direction: column;
    align-items: stretch;
  }

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

  .site-nav a {
    padding: 12px;
  }

  .hero {
    min-height: 720px;
    align-items: end;
    background: #11172a;
  }

  .hero::after {
    display: none;
  }

  .hero-content {
    width: 100%;
    padding: 58px 0 52px;
  }

  .hero-preview {
    top: 54px;
    right: 18px;
    width: 150px;
    transform: none;
  }

  h1 {
    max-width: 215px;
    font-size: 40px;
  }

  .hero-lead {
    margin-top: 190px;
    font-size: 16px;
  }

  .section {
    padding: 64px 0;
  }

  .section-heading {
    display: block;
  }

  .feature-grid,
  .shot-row,
  .path-grid,
  .review-grid,
  .info-grid,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .shot-row {
    gap: 34px;
  }

  .download-band .container {
    align-items: flex-start;
    flex-direction: column;
  }

  .download-band .button {
    width: 100%;
  }
}

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

  * {
    transition: none !important;
  }
}