/* Visual direction: Steam 现代游戏商店风
   Base: #1B2838 深空灰蓝 | Accent: #66C0F4 科技冷蓝 | CTA: #5BA32B 高饱和绿
   Panel: #16202D | Text: #C7D5E0 / #FFFFFF | Border: #2A475E
*/

:root {
  --bg: #1b2838;
  --bg-deep: #0e1621;
  --panel: #16202d;
  --panel-2: #1e2d3d;
  --line: #2a475e;
  --text: #c7d5e0;
  --muted: #8f98a0;
  --white: #ffffff;
  --blue: #66c0f4;
  --blue-dim: #417a9b;
  --green: #5ba32b;
  --green-hot: #6eb836;
  --gold: #ffc82c;
  --shadow: 0 10px 28px rgba(0, 0, 0, 0.35);
  --radius: 4px;
  --nav-h: 64px;
  --font: "Noto Sans SC", system-ui, -apple-system, sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font);
  color: var(--text);
  background:
    radial-gradient(1200px 500px at 20% -10%, rgba(102, 192, 244, 0.12), transparent 55%),
    radial-gradient(900px 420px at 90% 0%, rgba(91, 163, 43, 0.08), transparent 50%),
    linear-gradient(180deg, var(--bg-deep) 0%, var(--bg) 40%, #15202b 100%);
  min-height: 100vh;
  line-height: 1.7;
}

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

a {
  color: var(--blue);
  text-decoration: none;
}

a:hover {
  color: #a4d7f5;
}

.wrap {
  width: min(1120px, calc(100% - 2rem));
  margin-inline: auto;
}

.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 100;
  height: var(--nav-h);
  background: rgba(14, 22, 33, 0.92);
  border-bottom: 1px solid rgba(42, 71, 94, 0.9);
  backdrop-filter: blur(10px);
}

.nav-inner {
  height: var(--nav-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  color: var(--white);
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand img {
  width: 36px;
  height: 36px;
  border-radius: 3px;
  object-fit: cover;
  border: 1px solid var(--line);
}

.nav-links {
  display: none;
  align-items: center;
  gap: 1.15rem;
}

.nav-links a {
  color: var(--text);
  font-size: 0.92rem;
  font-weight: 600;
}

.nav-links a:hover,
.nav-links a.is-active {
  color: var(--blue);
}

.menu-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 0.9rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--white);
  border-radius: var(--radius);
  font-weight: 700;
}

.mobile-nav {
  display: none;
  border-top: 1px solid var(--line);
  background: rgba(14, 22, 33, 0.98);
  padding: 0.85rem 1rem 1rem;
}

.mobile-nav.is-open {
  display: grid;
  gap: 0.55rem;
}

.mobile-nav a {
  min-height: 44px;
  display: flex;
  align-items: center;
  color: var(--text);
  font-weight: 600;
  padding: 0 0.4rem;
}

@media (min-width: 768px) {
  .menu-btn,
  .mobile-nav,
  .mobile-nav.is-open {
    display: none;
  }

  .nav-links {
    display: flex;
  }
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0.7rem 1.25rem;
  border-radius: var(--radius);
  border: 1px solid transparent;
  font-weight: 800;
  letter-spacing: 0.02em;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
}

.btn-cta {
  position: relative;
  overflow: hidden;
  background: linear-gradient(180deg, var(--green-hot), var(--green));
  color: #10240a !important;
  box-shadow: 0 0 0 1px rgba(168, 226, 110, 0.25), 0 10px 24px rgba(91, 163, 43, 0.35);
}

.btn-cta::after {
  content: "";
  position: absolute;
  inset: -40% auto -40% -35%;
  width: 28%;
  transform: rotate(18deg);
  background: rgba(255, 255, 255, 0.45);
  animation: shine 2.8s linear infinite;
}

@keyframes shine {
  0% {
    left: -40%;
  }
  55%,
  100% {
    left: 130%;
  }
}

.btn-cta:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, #7bc43a, #5ba32b);
}

.btn-ghost {
  background: rgba(22, 32, 45, 0.85);
  border-color: var(--blue);
  color: var(--blue) !important;
}

.btn-ghost:hover {
  background: rgba(102, 192, 244, 0.12);
}

main {
  padding-top: var(--nav-h);
}

.hero {
  position: relative;
  min-height: calc(100vh - var(--nav-h));
  display: grid;
  align-items: center;
  overflow: hidden;
  isolation: isolate;
}

.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(10, 16, 24, 0.94) 0%, rgba(14, 22, 33, 0.78) 48%, rgba(14, 22, 33, 0.45) 100%),
    var(--hero-image) center / cover no-repeat;
  z-index: -1;
}

.hero-grid {
  display: grid;
  gap: 1.5rem;
  padding: 2.5rem 0 3rem;
}

@media (min-width: 960px) {
  .hero-grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }
}

.badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid rgba(102, 192, 244, 0.45);
  background: rgba(14, 22, 33, 0.78);
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  border-radius: 2px;
}

.hero h1 {
  margin: 0.9rem 0 0;
  color: var(--white);
  font-size: clamp(2.1rem, 5vw, 3.6rem);
  line-height: 1.15;
  font-weight: 900;
}

.hero h1 span {
  display: block;
  margin-top: 0.35rem;
  color: var(--blue);
  font-size: 0.48em;
  font-weight: 700;
}

.lead {
  margin: 1rem 0 0;
  max-width: 38rem;
  color: #dbe6f0;
  font-size: 1.05rem;
}

.metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  margin-top: 1.35rem;
}

@media (min-width: 640px) {
  .metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.metric {
  background: rgba(14, 22, 33, 0.78);
  border: 1px solid var(--line);
  padding: 0.85rem 0.75rem;
  border-radius: var(--radius);
}

.metric strong {
  display: block;
  color: var(--gold);
  font-size: 1.35rem;
  line-height: 1.2;
}

.metric span {
  color: var(--muted);
  font-size: 0.82rem;
}

.cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.hero-media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  background: #000;
  aspect-ratio: 16 / 9;
}

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

.info-grid {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  margin: -1.5rem auto 0;
  position: relative;
  z-index: 2;
  box-shadow: var(--shadow);
}

@media (min-width: 768px) {
  .info-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

.info-grid article {
  background: var(--panel);
  padding: 1rem 1.05rem;
}

.info-grid span {
  display: block;
  color: var(--muted);
  font-size: 0.8rem;
}

.info-grid strong {
  display: block;
  margin-top: 0.25rem;
  color: var(--white);
  font-size: 1rem;
}

.section {
  padding: 3.4rem 0;
}

.section-alt {
  background: rgba(14, 22, 33, 0.45);
  border-block: 1px solid rgba(42, 71, 94, 0.55);
}

.section-head {
  margin-bottom: 1.4rem;
}

.eyebrow {
  color: var(--blue);
  font-size: 0.82rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.section-head h2 {
  margin: 0.35rem 0 0;
  color: var(--white);
  font-size: clamp(1.55rem, 3vw, 2rem);
}

.section-head p {
  margin: 0.55rem 0 0;
  color: var(--muted);
  max-width: 42rem;
}

.story-box {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.4rem 1.3rem;
}

.story-box p {
  margin: 0 0 1rem;
  font-size: 1.02rem;
  line-height: 1.9;
}

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

.feature-grid {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 768px) {
  .feature-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.feature-card,
.guide-card,
.review-card,
.article-card,
.platform-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.15rem 1.1rem;
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.feature-card:hover,
.guide-card:hover,
.review-card:hover,
.article-card:hover,
.platform-card:hover {
  transform: translateY(-3px);
  border-color: rgba(102, 192, 244, 0.55);
  box-shadow: var(--shadow);
}

.feature-card h3,
.guide-card h3,
.platform-card h3,
.article-card h3 {
  margin: 0;
  color: var(--white);
  font-size: 1.08rem;
}

.feature-card p,
.guide-card p,
.platform-card p,
.article-card p,
.review-card p {
  margin: 0.55rem 0 0;
  color: var(--muted);
}

.gallery-grid {
  display: grid;
  gap: 0.85rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

@media (min-width: 768px) {
  .gallery-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.gallery-item {
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: #000;
  cursor: zoom-in;
}

.gallery-item img {
  width: 100%;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  transition: transform 0.25s ease, filter 0.25s ease;
}

.gallery-item:hover img {
  transform: scale(1.04);
  filter: brightness(1.08);
}

.download-band {
  background:
    linear-gradient(135deg, rgba(91, 163, 43, 0.18), rgba(102, 192, 244, 0.08)),
    var(--panel);
  border: 1px solid rgba(91, 163, 43, 0.45);
  border-radius: var(--radius);
  padding: 1.6rem 1.3rem;
  display: grid;
  gap: 1rem;
  align-items: center;
}

@media (min-width: 768px) {
  .download-band {
    grid-template-columns: 1fr auto;
  }
}

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

.download-band p {
  margin: 0.45rem 0 0;
  color: var(--muted);
}

.accordion {
  display: grid;
  gap: 0.65rem;
}

.accordion-item {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.accordion-trigger {
  width: 100%;
  min-height: 52px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1rem;
  background: transparent;
  border: 0;
  color: var(--white);
  font: inherit;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.accordion-mark {
  color: var(--blue);
  font-size: 1.25rem;
  line-height: 1;
}

.accordion-mark::before {
  content: "+";
}

.accordion-item.is-open .accordion-mark::before {
  content: "-";
}

.accordion-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.28s ease;
}

.accordion-panel > div {
  padding: 0 1rem 1rem;
  color: var(--muted);
  line-height: 1.8;
}

.reviews {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 768px) {
  .reviews {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.review-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem 1.2rem;
  margin-bottom: 1rem;
  color: var(--gold);
  font-weight: 800;
}

.review-card {
  animation: rise 0.55s ease both;
}

.review-card:nth-child(2) {
  animation-delay: 0.08s;
}

.review-card:nth-child(3) {
  animation-delay: 0.16s;
}

@keyframes rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.stars {
  color: var(--gold);
  letter-spacing: 0.08em;
  font-size: 0.92rem;
}

.final-cta {
  text-align: center;
  background:
    radial-gradient(600px 220px at 50% 0%, rgba(102, 192, 244, 0.16), transparent 70%),
    var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 2.2rem 1.2rem;
}

.final-cta h2 {
  margin: 0;
  color: var(--white);
  font-size: clamp(1.5rem, 3vw, 2rem);
}

.final-cta p {
  margin: 0.7rem auto 0;
  max-width: 36rem;
  color: var(--muted);
}

.final-cta .cta-row {
  justify-content: center;
}

.final-note {
  margin-top: 0.9rem;
  color: var(--muted);
  font-size: 0.85rem;
}

.site-footer {
  margin-top: 2rem;
  padding: 2.2rem 0 2.6rem;
  background: #0b121b;
  border-top: 1px solid var(--line);
}

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

@media (min-width: 768px) {
  .footer-grid {
    grid-template-columns: 1.3fr 1fr 1.2fr;
  }
}

.site-footer h3 {
  margin: 0 0 0.65rem;
  color: var(--white);
  font-size: 1rem;
}

.site-footer p,
.site-footer li {
  color: var(--muted);
  font-size: 0.92rem;
}

.site-footer ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0.35rem;
}

.related-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
}

.copyright {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(42, 71, 94, 0.7);
  color: var(--muted);
  font-size: 0.85rem;
}

.page-hero {
  padding: 2.2rem 0 1.2rem;
}

.page-hero h1 {
  margin: 0.4rem 0 0;
  color: var(--white);
  font-size: clamp(1.7rem, 3.5vw, 2.4rem);
}

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.2rem;
}

.tab-button {
  min-height: 40px;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 999px;
  font-weight: 700;
  cursor: pointer;
}

.tab-button.is-active {
  background: rgba(102, 192, 244, 0.15);
  border-color: var(--blue);
  color: var(--blue);
}

.two-col {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 768px) {
  .two-col {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.platform-card .tag {
  display: inline-block;
  margin-bottom: 0.45rem;
  padding: 0.15rem 0.5rem;
  background: rgba(91, 163, 43, 0.18);
  color: #9be15d;
  border-radius: 2px;
  font-size: 0.75rem;
  font-weight: 800;
}

.timeline {
  display: grid;
  gap: 0.9rem;
  border-left: 2px solid var(--line);
  padding-left: 1.1rem;
}

.timeline-item {
  position: relative;
}

.timeline-item::before {
  content: "";
  position: absolute;
  left: -1.42rem;
  top: 0.35rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--blue);
  box-shadow: 0 0 0 3px rgba(102, 192, 244, 0.2);
}

.req-table,
.guide-table,
.article-table {
  width: 100%;
  border-collapse: collapse;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.req-table th,
.req-table td,
.guide-table th,
.guide-table td,
.article-table th,
.article-table td {
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 0.85rem;
  text-align: left;
  vertical-align: top;
  font-size: 0.92rem;
}

.req-table th,
.guide-table th,
.article-table th {
  color: var(--white);
  background: rgba(102, 192, 244, 0.08);
}

.guide-grid {
  display: grid;
  gap: 0.9rem;
}

@media (min-width: 768px) {
  .guide-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.guide-card {
  text-align: left;
  width: 100%;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.guide-card .more {
  display: inline-block;
  margin-top: 0.8rem;
  color: var(--blue);
  font-weight: 800;
}

.article-list {
  display: grid;
  gap: 0.85rem;
}

@media (min-width: 768px) {
  .article-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.article-body {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1.35rem 1.2rem;
}

.article-body h2 {
  color: var(--white);
  margin: 1.5rem 0 0.7rem;
  font-size: 1.25rem;
}

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

.article-body p,
.article-body li {
  color: var(--muted);
  line-height: 1.85;
}

.article-body ul,
.article-body ol {
  padding-left: 1.2rem;
}

.checklist {
  list-style: none;
  padding: 0;
  margin: 1rem 0;
  display: grid;
  gap: 0.45rem;
}

.checklist li {
  position: relative;
  padding-left: 1.4rem;
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 0.55rem;
  height: 0.55rem;
  border-radius: 2px;
  background: var(--green);
}

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  color: var(--muted);
  font-size: 0.85rem;
  margin-bottom: 0.8rem;
}

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

.lightbox,
.guide-modal {
  display: none;
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(5, 10, 16, 0.88);
  align-items: center;
  justify-content: center;
  padding: 1rem;
}

.lightbox.is-open,
.guide-modal.is-open {
  display: flex;
}

.lightbox-inner,
.modal-inner {
  width: min(960px, 100%);
  max-height: 90vh;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 1rem;
}

.lightbox-inner img {
  width: 100%;
  max-height: 72vh;
  object-fit: contain;
  background: #000;
}

.lightbox-caption {
  margin-top: 0.7rem;
  color: var(--muted);
}

.lightbox-controls,
.modal-head {
  display: flex;
  justify-content: space-between;
  gap: 0.6rem;
  margin-bottom: 0.7rem;
}

.modal-head h3 {
  margin: 0;
  color: var(--white);
}

.overflow-hidden {
  overflow: hidden;
}

.hidden {
  display: none !important;
}

.toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 0 0 1.2rem;
}

.toc a {
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--panel);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
}

@media (max-width: 360px) {
  .wrap {
    width: calc(100% - 1.2rem);
  }

  .cta-row .btn {
    width: 100%;
  }
}