:root {
  --bg: #f6f8fb;
  --midnight: #06101d;
  --midnight-2: #0a1b2e;
  --surface: rgba(255, 255, 255, 0.86);
  --surface-strong: rgba(255, 255, 255, 0.94);
  --text: #0c1b2d;
  --text-soft: #5e7187;
  --text-on-dark: rgba(255, 255, 255, 0.82);
  --line: rgba(12, 27, 45, 0.1);

  --blue: #2e71ff;
  --blue-2: #6aa6ff;
  --aurora: #37f2c2;

  --radius-lg: 24px;
  --radius-xl: 32px;
  --radius-2xl: 42px;

  --shadow-sm: 0 10px 22px rgba(8, 16, 28, 0.08);
  --shadow-md: 0 18px 46px rgba(8, 16, 28, 0.12);
  --shadow-xl: 0 45px 110px rgba(3, 8, 18, 0.42);

  /* 整体内容最大宽度：加宽以降低“紧凑感” */
  --container: 1360px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", system-ui, -apple-system, Segoe UI, sans-serif;
  color: var(--text);
  line-height: 1.75;
  background:
    radial-gradient(900px 520px at 8% 12%, rgba(46, 113, 255, 0.14), transparent 55%),
    radial-gradient(720px 540px at 88% 10%, rgba(55, 242, 194, 0.1), transparent 60%),
    linear-gradient(180deg, var(--midnight) 0%, #0a1730 18%, #f4f7fb 19%, #fbfdff 62%, #ffffff 100%);
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.08;
  mix-blend-mode: overlay;
  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='220' height='220' filter='url(%23n)' opacity='.35'/%3E%3C/svg%3E");
}

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

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

code {
  padding: 0.15rem 0.45rem;
  border-radius: 10px;
  background: rgba(46, 113, 255, 0.09);
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
}

.container {
  /* 大屏更舒展，小屏保持安全边距 */
  width: min(var(--container), calc(100% - 2.5rem));
  margin: 0 auto;
}

.sr-only {
  position: absolute !important;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 99;
  padding: 0.6rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.92);
  border: 1px solid rgba(12, 27, 45, 0.12);
  box-shadow: var(--shadow-sm);
  transform: translateY(-160%);
  transition: transform 160ms ease;
}

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

:focus-visible {
  outline: 3px solid rgba(55, 242, 194, 0.35);
  outline-offset: 3px;
}

h1,
h2,
h3,
strong,
.footer-title {
  margin: 0;
  letter-spacing: -0.03em;
}

h1,
h2 {
  font-family: "Noto Serif SC", "Noto Sans SC", serif;
}

h1 {
  display: grid;
  gap: 0.14rem;
  font-size: clamp(2.35rem, 4.6vw, 4.2rem);
  line-height: 1.05;
  color: #fff;
}

h2 {
  font-size: clamp(1.65rem, 3vw, 2.35rem);
  line-height: 1.15;
  color: #071628;
}

h3 {
  font-size: 1.16rem;
  line-height: 1.3;
  color: #071628;
}

.headline-kicker {
  font-size: 0.76em;
}

.headline-main {
  max-width: none;
}

.headline-sub {
  font-size: clamp(1rem, 1.45vw, 1.25rem);
  line-height: 1.35;
  color: rgba(255, 255, 255, 0.72);
}

.eyebrow,
.section-tag,
.source-label {
  display: inline-flex;
  margin: 0 0 0.85rem;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: rgba(138, 180, 255, 0.95);
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(6, 16, 29, 0.76);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
  backdrop-filter: blur(16px);
}

.nav-shell {
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  color: #fff;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.brand-mark {
  width: 34px;
  height: 34px;
  border-radius: 12px;
  background:
    radial-gradient(circle at 30% 30%, rgba(55, 242, 194, 0.9), transparent 58%),
    linear-gradient(135deg, rgba(46, 113, 255, 0.95), rgba(106, 166, 255, 0.65));
  box-shadow: 0 14px 28px rgba(46, 113, 255, 0.3);
  position: relative;
}

.brand-mark::after {
  content: "Q";
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
  font-size: 18px;
  color: rgba(6, 16, 29, 0.86);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.2rem;
  color: rgba(255, 255, 255, 0.74);
  font-size: 0.95rem;
}

.nav-links a:hover {
  color: #fff;
}

.nav-cta {
  padding: 0.55rem 0.9rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.nav-toggle {
  display: none;
  border: 0;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.14);
  color: #fff;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  backdrop-filter: blur(12px);
}

.nav-toggle-lines {
  display: block;
  width: 18px;
  height: 2px;
  background: #fff;
  margin: 0 auto;
  border-radius: 999px;
  box-shadow: 0 -6px 0 #fff, 0 6px 0 #fff;
}

.hero-section {
  padding: 2.6rem 0 1.4rem;
}

.hero-stage {
  position: relative;
  overflow: hidden;
  padding: 4rem;
  border-radius: var(--radius-2xl);
  background:
    linear-gradient(180deg, rgba(6, 16, 29, 0.58), rgba(6, 16, 29, 0.88)),
    url("./assets/homeH5Banner.webp") center / cover no-repeat,
    radial-gradient(900px 520px at 15% 20%, rgba(46, 113, 255, 0.22), transparent 56%),
    radial-gradient(780px 520px at 92% 10%, rgba(55, 242, 194, 0.12), transparent 56%),
    linear-gradient(140deg, rgba(6, 16, 29, 0.92), rgba(10, 27, 46, 0.7));
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow-xl);
}

.keyword-wall {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  opacity: 0.12;
  mix-blend-mode: screen;
  display: grid;
  align-content: center;
  gap: 18px;
  padding: 3.2rem 1.6rem;
  transform: rotate(-9deg) scale(1.05);
}

.keyword-row {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  justify-content: center;
  font-family: "Noto Serif SC", serif;
  font-weight: 900;
  letter-spacing: -0.02em;
  font-size: clamp(1.05rem, 2.3vw, 1.8rem);
  color: rgba(255, 255, 255, 0.9);
}

.keyword-row span {
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.04);
}

.hero-stage::before {
  content: "";
  position: absolute;
  inset: -1px;
  pointer-events: none;
  background:
    radial-gradient(circle at 72% 34%, rgba(53, 115, 255, 0.18), transparent 26%),
    radial-gradient(circle at 20% 16%, rgba(55, 242, 194, 0.12), transparent 22%);
  opacity: 0.9;
}

.hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(420px, 0.95fr);
  gap: 2.6rem;
  align-items: center;
}

.hero-grid--single {
  grid-template-columns: minmax(0, 1fr);
  /* 首屏文案区域适当放宽 */
  max-width: 1120px;
}

.hero-tagline {
  display: flex;
  gap: 0.65rem;
  margin: 0 0 0.9rem;
  color: rgba(255, 255, 255, 0.8);
  font-weight: 800;
}

.hero-tagline span {
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(255, 255, 255, 0.06);
  backdrop-filter: blur(10px);
}

.hero-lead {
  margin: 1.25rem 0 0;
  /* 放宽可读宽度，减少换行带来的“挤” */
  max-width: 72ch;
  color: var(--text-on-dark);
  font-size: 1.03rem;
}

.cta-group {
  display: flex;
  flex-wrap: wrap;
  gap: 0.95rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0.85rem 1.35rem;
  border-radius: 999px;
  border: 1px solid transparent;
  font-weight: 800;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease, background-color 180ms ease,
    filter 180ms ease;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: linear-gradient(135deg, var(--blue), var(--blue-2));
  color: #fff;
  box-shadow: 0 20px 44px rgba(46, 113, 255, 0.32);
}

.button-primary:hover {
  filter: brightness(1.06);
}

.button-secondary {
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border-color: rgba(255, 255, 255, 0.16);
  backdrop-filter: blur(10px);
}

.button-ghost {
  background: transparent;
  color: rgba(255, 255, 255, 0.88);
  border-color: rgba(255, 255, 255, 0.18);
}

.hero-mini {
  margin-top: 2rem;
  display: flex;
  gap: 1rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding-bottom: 0.35rem;
  scroll-snap-type: x mandatory;
}

.hero-mini-item {
  flex: 0 0 auto;
  min-width: 260px;
  padding: 1.05rem 1.1rem;
  border-radius: 22px;
  background: rgba(6, 16, 29, 0.56);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
  display: flex;
  gap: 0.8rem;
  align-items: center;
  scroll-snap-align: start;
}

.hero-mini-icon {
  width: 44px;
  height: 44px;
  border-radius: 16px;
  display: grid;
  place-items: center;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.1);
  flex: 0 0 auto;
}

.hero-mini-item strong {
  display: block;
  font-weight: 900;
  color: #fff;
  letter-spacing: -0.02em;
}

.hero-mini-item span {
  display: block;
  margin-top: 0.35rem;
  color: rgba(255, 255, 255, 0.72);
  font-size: 0.95rem;
}

.hero-stats {
  position: relative;
  z-index: 1;
  margin-top: 1.6rem;
  display: flex;
  gap: 0.75rem;
  flex-wrap: nowrap;
  overflow-x: auto;
  padding: 0.85rem 0.85rem 0.55rem;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
  scroll-snap-type: x mandatory;
}

.hero-stat {
  flex: 0 0 auto;
  min-width: 190px;
  padding: 0.85rem 0.9rem;
  border-radius: 18px;
  background: rgba(6, 16, 29, 0.35);
  border: 1px solid rgba(255, 255, 255, 0.08);
  scroll-snap-align: start;
}

.hero-stat span {
  display: block;
  color: rgba(255, 255, 255, 0.65);
  font-weight: 700;
  font-size: 0.9rem;
}

.hero-stat strong {
  display: block;
  margin-top: 0.25rem;
  color: #fff;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.hero-visual {
  position: relative;
  min-height: 620px;
}

.device-frame {
  position: relative;
  height: 100%;
  overflow: hidden;
  border-radius: 34px;
  box-shadow: 0 34px 78px rgba(2, 7, 15, 0.46);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.device-frame::before {
  content: "";
  position: absolute;
  inset: 12px;
  border-radius: 28px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  pointer-events: none;
}

.hero-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transform: scale(1.02);
}

.hero-image-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(6, 16, 29, 0.08), rgba(6, 16, 29, 0.55)),
    radial-gradient(circle at 70% 25%, rgba(55, 242, 194, 0.16), transparent 55%),
    radial-gradient(circle at 30% 70%, rgba(46, 113, 255, 0.16), transparent 60%);
}

.hero-facts {
  position: absolute;
  left: 1.25rem;
  right: 1.25rem;
  bottom: 1.25rem;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
}

.hero-fact {
  padding: 1rem 1.05rem;
  border-radius: 20px;
  background: rgba(6, 16, 29, 0.62);
  border: 1px solid rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(14px);
}

.hero-fact small {
  display: block;
  margin-bottom: 0.42rem;
  color: rgba(255, 255, 255, 0.62);
}

.hero-fact strong,
.visual-copy strong {
  display: block;
  color: #fff;
  font-size: 1rem;
  line-height: 1.36;
}

.notice-strip {
  padding: 1.05rem 0 0.45rem;
}

.notice-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 0.95rem;
  align-items: center;
  padding: 1.15rem 1.25rem;
  border-radius: 22px;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(12, 27, 45, 0.08);
  box-shadow: var(--shadow-sm);
}

.notice-icon {
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  color: var(--blue);
  background: rgba(46, 113, 255, 0.08);
}

.notice-inner p {
  margin: 0;
  color: var(--text-soft);
}

.notice-link {
  font-weight: 800;
  color: #0b1d33;
  padding: 0.4rem 0.65rem;
  border-radius: 999px;
  border: 1px solid rgba(12, 27, 45, 0.12);
  background: rgba(255, 255, 255, 0.7);
}

.visual-strip {
  padding: 1.15rem 0 0.6rem;
}

.visual-grid {
  display: grid;
  grid-template-columns: 1.2fr 1fr 1fr;
  gap: 1.2rem;
}

.visual-grid--ill {
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: 1.15rem;
  scroll-snap-type: x mandatory;
  padding-bottom: 0.4rem;
}

.visual-card {
  position: relative;
  overflow: hidden;
  min-height: 320px;
  border-radius: 30px;
  box-shadow: var(--shadow-md);
  border: 1px solid rgba(255, 255, 255, 0.74);
}

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

.visual-card::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(6, 16, 29, 0.06), rgba(6, 16, 29, 0.82));
}

.ill-card {
  min-height: 0;
  padding: 1.15rem;
  background: rgba(255, 255, 255, 0.78);
  border: 1px solid rgba(12, 27, 45, 0.08);
  box-shadow: var(--shadow-sm);
  flex: 0 0 auto;
  width: min(520px, calc(100vw - 2rem));
  scroll-snap-align: start;
}

.visual-grid--ill .visual-card::after {
  display: none;
}

.ill-media {
  border-radius: 22px;
  padding: 1rem;
  background:
    radial-gradient(circle at 28% 20%, rgba(46, 113, 255, 0.14), transparent 55%),
    radial-gradient(circle at 86% 30%, rgba(55, 242, 194, 0.12), transparent 60%),
    rgba(6, 16, 29, 0.03);
  border: 1px solid rgba(12, 27, 45, 0.06);
  height: 280px;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.ill-media img {
  width: min(520px, 100%);
  height: 100%;
  object-fit: contain;
}

.ill-copy {
  margin-top: 0.9rem;
}

.ill-copy span {
  display: inline-flex;
  margin-bottom: 0.5rem;
  padding: 0.35rem 0.7rem;
  border-radius: 999px;
  background: rgba(46, 113, 255, 0.08);
  color: rgba(46, 113, 255, 0.95);
  font-size: 0.82rem;
  font-weight: 900;
}

.ill-copy strong {
  display: block;
  color: #071628;
  font-size: 1.08rem;
  line-height: 1.35;
}

.section {
  padding: 1.8rem 0 5rem;
}

.section-soft {
  background:
    radial-gradient(circle at top right, rgba(46, 113, 255, 0.05), transparent 24%),
    linear-gradient(180deg, rgba(6, 16, 29, 0.02), rgba(255, 255, 255, 0));
}

.section-heading {
  /* 二级标题区更宽，减少过早换行 */
  max-width: 920px;
  margin-bottom: 1.6rem;
}

.section-heading p,
.content-card p,
.platform-card p,
.feature-card p,
.faq-list p,
.source-card p,
.related-card span,
.site-footer p {
  color: var(--text-soft);
  margin: 0;
}

.section-grid {
  display: grid;
  gap: 1.4rem;
}

.two-col {
  grid-template-columns: 1.15fr 0.85fr;
}

.content-card,
.platform-card,
.feature-card,
.source-card,
.related-card {
  border-radius: var(--radius-lg);
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.9);
  box-shadow: var(--shadow-sm);
  backdrop-filter: blur(16px);
}

.content-card,
.platform-card,
.feature-card,
.source-card {
  padding: 1.55rem;
}

.highlight-card {
  background:
    radial-gradient(circle at 24% 14%, rgba(46, 113, 255, 0.14), transparent 55%),
    linear-gradient(180deg, rgba(46, 113, 255, 0.06), rgba(255, 255, 255, 0.94));
}

.callout-card {
  background:
    radial-gradient(circle at 22% 18%, rgba(55, 242, 194, 0.12), transparent 56%),
    linear-gradient(180deg, rgba(208, 161, 71, 0.06), rgba(255, 255, 255, 0.94));
}

.stack-list,
.platform-card ul,
.footer-links {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
  color: var(--text-soft);
}

.stack-list li,
.platform-card li,
.footer-links li {
  margin-top: 0.45rem;
}

.platform-grid,
.feature-grid,
.related-grid,
.source-grid {
  display: grid;
  gap: 1.15rem;
}

.platform-grid {
  grid-template-columns: repeat(12, minmax(0, 1fr));
}

.platform-card {
  grid-column: span 4;
  min-height: 220px;
  position: relative;
  overflow: hidden;
}

.platform-card::before {
  content: "";
  position: absolute;
  right: -24px;
  top: -24px;
  width: 130px;
  height: 130px;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(46, 113, 255, 0.12), transparent 70%);
}

.platform-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.8rem;
}

.platform-title {
  display: flex;
  align-items: center;
  gap: 0.65rem;
}

.platform-icon {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(46, 113, 255, 0.08);
  border: 1px solid rgba(46, 113, 255, 0.12);
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 0.42rem 0.75rem;
  border-radius: 999px;
  background: rgba(46, 113, 255, 0.1);
  color: var(--blue);
  font-weight: 800;
  font-size: 0.88rem;
}

.featured-platform {
  grid-column: span 8;
  background:
    radial-gradient(circle at 20% 18%, rgba(55, 242, 194, 0.12), transparent 60%),
    linear-gradient(135deg, rgba(6, 16, 29, 0.98), rgba(10, 27, 46, 0.94));
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 26px 66px rgba(3, 8, 18, 0.42);
}

.featured-platform h3,
.featured-platform p,
.featured-platform li {
  color: rgba(255, 255, 255, 0.92);
}

.featured-platform .platform-icon {
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(255, 255, 255, 0.14);
}

.platform-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.1rem;
}

.feature-grid,
.source-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.feature-card {
  min-height: 190px;
  position: relative;
}

.mini-icon {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  border-radius: 16px;
  background: rgba(46, 113, 255, 0.08);
  border: 1px solid rgba(46, 113, 255, 0.12);
  font-size: 20px;
}

.feature-card h3 {
  margin-top: 0.95rem;
}

.source-card {
  margin-top: 1.2rem;
}

.source-card strong {
  display: block;
  font-size: 1.12rem;
  margin-bottom: 0.45rem;
}

.windows-layout {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.2rem;
}

.table-wrap {
  margin-top: 1rem;
  overflow-x: auto;
}

table {
  width: 100%;
  min-width: 520px;
  border-collapse: collapse;
  border-radius: 18px;
  overflow: hidden;
}

thead {
  background: rgba(46, 113, 255, 0.08);
}

th,
td {
  padding: 0.95rem 1rem;
  text-align: left;
  border-bottom: 1px solid var(--line);
}

tbody tr:hover td {
  background: rgba(46, 113, 255, 0.04);
}

tbody tr:last-child td {
  border-bottom: 0;
}

.step-list {
  margin: 1rem 0 0;
  padding-left: 1.15rem;
  color: var(--text-soft);
}

.step-list li {
  margin-top: 0.52rem;
}

.faq-list {
  display: grid;
  gap: 1rem;
}

.faq-list details {
  padding: 1.15rem 1.3rem;
  border-radius: 20px;
  background: var(--surface-strong);
  border: 1px solid rgba(12, 27, 45, 0.08);
  box-shadow: var(--shadow-sm);
}

.faq-list summary {
  cursor: pointer;
  list-style: none;
  position: relative;
  padding-right: 2rem;
  font-weight: 800;
  color: #071628;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: -0.05rem;
  color: var(--blue);
  font-size: 1.3rem;
}

.faq-list details[open] summary::after {
  content: "−";
}

.faq-list p {
  margin-top: 0.8rem;
}

.related-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.related-card {
  display: block;
  padding: 1.45rem;
  transition: transform 180ms ease, box-shadow 180ms ease, border-color 180ms ease;
  width: 100%;
  text-align: left;
  cursor: pointer;
  color: inherit;
}

button.related-card {
  appearance: none;
  -webkit-appearance: none;
  font: inherit;
}

.related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(46, 113, 255, 0.16);
}

.related-card strong {
  display: block;
  margin-bottom: 0.45rem;
  font-size: 1.05rem;
  color: #071628;
}

.site-footer {
  padding: 2.2rem 0 3rem;
  border-top: 1px solid rgba(12, 27, 45, 0.08);
  background: rgba(255, 255, 255, 0.66);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.footer-title {
  font-size: 1.08rem;
  color: #071628;
  margin-bottom: 0.75rem;
}

.footer-meta {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px dashed rgba(12, 27, 45, 0.12);
  display: grid;
  gap: 0.35rem;
}

.footer-legal {
  margin: 0;
  color: rgba(12, 27, 45, 0.62);
  font-size: 0.92rem;
}

/* Responsive */
@media (max-width: 1120px) {
  .hero-grid,
  .two-col,
  .windows-layout,
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .platform-grid,
  .feature-grid,
  .related-grid,
  .source-grid,
  .visual-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .hero-stage {
    padding: 2.2rem;
  }

  .platform-card,
  .featured-platform {
    grid-column: auto;
  }

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

  .notice-link {
    grid-column: 1 / -1;
    width: fit-content;
  }
}

@media (max-width: 820px) {
  .nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .nav-links {
    position: fixed;
    inset: 78px 0 auto 0;
    padding: 1rem 1rem 1.2rem;
    display: grid;
    gap: 0.65rem;
    background: rgba(6, 16, 29, 0.92);
    border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    transform: translateY(-120%);
    transition: transform 180ms ease;
  }

  .nav-links a {
    padding: 0.85rem 1rem;
    border-radius: 16px;
    border: 1px solid rgba(255, 255, 255, 0.1);
    background: rgba(255, 255, 255, 0.06);
  }

  .nav-cta {
    background: linear-gradient(135deg, rgba(46, 113, 255, 0.95), rgba(106, 166, 255, 0.7));
    border: 0;
  }

  body.nav-open .nav-links {
    transform: translateY(0);
  }

  .hero-stage {
    padding: 1.6rem;
    border-radius: 28px;
  }

  .hero-visual {
    min-height: 420px;
  }

  .hero-facts,
  .feature-grid,
  .related-grid,
  .source-grid,
  .visual-grid,
  .windows-layout {
    grid-template-columns: 1fr;
  }

  .keyword-wall {
    opacity: 0.09;
    transform: rotate(-8deg) scale(1.12);
  }

  .hero-mini-item {
    min-width: 240px;
  }

  .hero-stat {
    min-width: 170px;
  }



  h1 {
    font-size: clamp(2.05rem, 10vw, 3.35rem);
  }

  .headline-main {
    max-width: none;
  }
}

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

  *,
  *::before,
  *::after {
    animation: none !important;
    transition: none !important;
  }
}