@import url("https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;600;700&display=swap");

:root {
  --vtx-bg-deep: #0c0820;
  --vtx-bg-card: rgba(28, 22, 58, 0.72);
  --vtx-accent-coral: #ff6b4a;
  --vtx-accent-mint: #3dffc4;
  --vtx-accent-violet: #8b5cf6;
  --vtx-accent-gold: #ffc857;
  --vtx-text-main: #f4f0ff;
  --vtx-text-muted: #a89ec8;
  --vtx-border: rgba(139, 92, 246, 0.28);
  --vtx-header-h: 62px;
  --vtx-dl-height: 0px;
  --vtx-radius-lg: 22px;
  --vtx-radius-md: 14px;
  --vtx-shadow: 0 18px 48px rgba(8, 4, 24, 0.55);
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--vtx-bg-deep);
  color: var(--vtx-text-main);
  line-height: 1.78;
  font-size: 16px;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 50% at 15% 10%, rgba(255, 107, 74, 0.14), transparent 55%),
    radial-gradient(ellipse 60% 45% at 85% 25%, rgba(61, 255, 196, 0.1), transparent 50%),
    radial-gradient(ellipse 70% 60% at 50% 90%, rgba(139, 92, 246, 0.12), transparent 55%);
  pointer-events: none;
  z-index: 0;
}

a {
  color: var(--vtx-accent-mint);
  text-decoration: none;
  transition: color 0.2s ease;
}

a:hover {
  color: var(--vtx-accent-gold);
}

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

.vtx-wrap {
  position: relative;
  z-index: 1;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 18px 64px;
}

/* Header */
.vtx-header {
  position: sticky;
  top: 0;
  z-index: 900;
  height: var(--vtx-header-h);
  background: rgba(12, 8, 32, 0.88);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--vtx-border);
}

.vtx-header-inner {
  max-width: 1080px;
  margin: 0 auto;
  padding: 0 18px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.vtx-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--vtx-text-main);
  font-weight: 700;
  font-size: 1.05rem;
}

.vtx-brand img {
  width: 38px;
  height: 38px;
  border-radius: 10px;
}

.vtx-nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--vtx-border);
  color: var(--vtx-text-main);
  padding: 6px 12px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 0.85rem;
}

.vtx-nav-panel {
  display: flex;
  align-items: center;
  gap: 6px;
}

.vtx-nav-panel a {
  color: var(--vtx-text-muted);
  padding: 8px 14px;
  border-radius: 999px;
  font-size: 0.9rem;
  font-weight: 500;
}

.vtx-nav-panel a:hover,
.vtx-nav-panel a.vtx-active {
  color: var(--vtx-text-main);
  background: rgba(139, 92, 246, 0.22);
}

/* Top ads strip */
.vtx-top-ads {
  background: rgba(18, 12, 42, 0.95);
  border-bottom: 1px solid var(--vtx-border);
  padding: 10px 12px 6px;
}

.vtx-top-ads #ads {
  display: flex;
  justify-content: center;
  align-items: flex-start;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 1080px;
  margin: 0 auto;
}

.vtx-top-ads #ads > div,
.vtx-ad-unit {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 70px;
}

.vtx-top-ads #ads img,
.vtx-ad-unit img {
  width: 56px;
  height: 56px;
  object-fit: cover;
  border-radius: 14px;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.vtx-top-ads #ads figcaption,
.vtx-top-ads #ads .caption,
.vtx-ad-cap {
  font-size: 10px;
  color: var(--vtx-text-muted);
  text-align: center;
  max-width: 68px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  margin-top: 2px;
}

/* Sticky download bar */
.vtx-sticky-dl {
  position: fixed;
  top: var(--vtx-header-h);
  left: 0;
  right: 0;
  z-index: 850;
  background: rgba(20, 14, 48, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--vtx-border);
  padding: 8px 12px;
  transform: translateY(-110%);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
  pointer-events: none;
}

.vtx-sticky-dl.vtx-visible {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

#vtx-sticky-dl-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  max-width: 1080px;
  margin: 0 auto;
}

.vtx-dl-tile {
  width: calc(12.5% - 8px);
  min-width: 72px;
}

.vtx-dl-tile a {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  color: var(--vtx-text-muted);
  font-size: 10px;
}

.vtx-dl-tile img {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  object-fit: cover;
}

.vtx-dl-tile span {
  max-width: 72px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  text-align: center;
}

body.vtx-dl-on .vtx-wrap,
body.vtx-dl-on .vtx-error {
  margin-top: var(--vtx-dl-height);
}

/* Hero */
.vtx-hero {
  padding: 48px 0 36px;
  text-align: center;
}

.vtx-hero-badge {
  display: inline-block;
  padding: 5px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, rgba(255, 107, 74, 0.2), rgba(139, 92, 246, 0.2));
  border: 1px solid var(--vtx-border);
  font-size: 0.82rem;
  color: var(--vtx-accent-mint);
  margin-bottom: 18px;
  letter-spacing: 0.06em;
}

.vtx-hero h1 {
  font-size: clamp(1.65rem, 5vw, 2.35rem);
  line-height: 1.35;
  margin: 0 0 16px;
  background: linear-gradient(120deg, #fff 20%, var(--vtx-accent-mint) 80%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.vtx-hero-lead {
  font-size: 1.05rem;
  color: var(--vtx-text-muted);
  max-width: 680px;
  margin: 0 auto 28px;
}

.vtx-hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 32px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--vtx-accent-coral), var(--vtx-accent-violet));
  color: #fff;
  font-weight: 600;
  font-size: 0.95rem;
  box-shadow: 0 8px 28px rgba(255, 107, 74, 0.35);
}

.vtx-hero-cta:hover {
  color: #fff;
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(139, 92, 246, 0.4);
}

/* Breadcrumb */
.vtx-crumb {
  padding: 14px 0 6px;
  font-size: 0.82rem;
  color: var(--vtx-text-muted);
}

.vtx-crumb a {
  color: var(--vtx-text-muted);
}

.vtx-crumb span {
  color: var(--vtx-accent-mint);
}

/* Sections */
.vtx-section {
  margin-bottom: 52px;
}

.vtx-section-title {
  font-size: 1.45rem;
  margin: 0 0 8px;
  color: var(--vtx-text-main);
  position: relative;
  padding-left: 16px;
}

.vtx-section-title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 4px;
  border-radius: 4px;
  background: linear-gradient(180deg, var(--vtx-accent-coral), var(--vtx-accent-violet));
}

.vtx-section-sub {
  font-size: 0.92rem;
  color: var(--vtx-text-muted);
  margin: 0 0 22px;
}

.vtx-prose p {
  margin: 0 0 16px;
  color: #d8d0f0;
}

.vtx-prose h2 {
  font-size: 1.25rem;
  margin: 32px 0 12px;
  color: var(--vtx-accent-gold);
}

.vtx-prose h3 {
  font-size: 1.08rem;
  margin: 24px 0 10px;
  color: var(--vtx-accent-mint);
}

/* Cards grid */
.vtx-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 18px;
  margin: 24px 0;
}

.vtx-card {
  background: var(--vtx-bg-card);
  border: 1px solid var(--vtx-border);
  border-radius: var(--vtx-radius-md);
  padding: 22px;
  backdrop-filter: blur(8px);
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.vtx-card:hover {
  border-color: rgba(61, 255, 196, 0.35);
  transform: translateY(-3px);
}

.vtx-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--vtx-accent-mint);
}

.vtx-card p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--vtx-text-muted);
  line-height: 1.7;
}

/* Feature row */
.vtx-feature-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 28px;
  align-items: center;
  margin: 32px 0;
}

.vtx-feature-row.vtx-reverse {
  direction: rtl;
}

.vtx-feature-row.vtx-reverse > * {
  direction: ltr;
}

.vtx-shot {
  border-radius: var(--vtx-radius-lg);
  overflow: hidden;
  border: 1px solid var(--vtx-border);
  box-shadow: var(--vtx-shadow);
}

.vtx-shot img {
  width: 100%;
  aspect-ratio: 9/16;
  object-fit: cover;
  object-position: top;
}

/* Stats strip */
.vtx-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 36px 0;
}

.vtx-stat {
  text-align: center;
  padding: 20px 12px;
  background: var(--vtx-bg-card);
  border-radius: var(--vtx-radius-md);
  border: 1px solid var(--vtx-border);
}

.vtx-stat strong {
  display: block;
  font-size: 1.5rem;
  color: var(--vtx-accent-coral);
  margin-bottom: 4px;
}

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

/* Pill tags */
.vtx-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0;
}

.vtx-tag {
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.8rem;
  background: rgba(139, 92, 246, 0.18);
  border: 1px solid var(--vtx-border);
  color: var(--vtx-text-muted);
}

/* FAQ */
.vtx-faq-item {
  background: var(--vtx-bg-card);
  border: 1px solid var(--vtx-border);
  border-radius: var(--vtx-radius-md);
  padding: 18px 20px;
  margin-bottom: 12px;
}

.vtx-faq-item h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--vtx-accent-gold);
}

.vtx-faq-item p {
  margin: 0;
  font-size: 0.92rem;
  color: var(--vtx-text-muted);
}

/* Subpage */
.vtx-sub-hero {
  padding: 36px 0 24px;
  border-bottom: 1px solid var(--vtx-border);
  margin-bottom: 32px;
}

.vtx-sub-hero h1 {
  font-size: 1.75rem;
  margin: 0 0 10px;
}

.vtx-sub-hero p {
  margin: 0;
  color: var(--vtx-text-muted);
  font-size: 0.95rem;
}

.vtx-legal h2 {
  font-size: 1.15rem;
  color: var(--vtx-accent-mint);
  margin: 28px 0 10px;
}

.vtx-legal p,
.vtx-legal li {
  color: #d0c8e8;
  font-size: 0.93rem;
}

.vtx-legal ul {
  padding-left: 20px;
  margin: 0 0 14px;
}

/* Error pages */
.vtx-error {
  text-align: center;
  padding: 60px 20px 80px;
}

.vtx-error-code {
  font-size: 5rem;
  font-weight: 700;
  line-height: 1;
  background: linear-gradient(135deg, var(--vtx-accent-coral), var(--vtx-accent-violet));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: 12px;
}

.vtx-error h1 {
  font-size: 1.4rem;
  margin: 0 0 12px;
}

.vtx-error p {
  color: var(--vtx-text-muted);
  margin: 0 0 24px;
}

.vtx-btn {
  display: inline-block;
  padding: 11px 28px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--vtx-accent-violet), var(--vtx-accent-coral));
  color: #fff;
  font-weight: 600;
  font-size: 0.9rem;
}

.vtx-btn:hover {
  color: #fff;
}

/* Footer */
.vtx-footer {
  border-top: 1px solid var(--vtx-border);
  padding: 36px 18px;
  margin-top: 20px;
  background: rgba(8, 5, 20, 0.6);
}

.vtx-footer-inner {
  max-width: 1080px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.vtx-footer h4 {
  margin: 0 0 12px;
  font-size: 0.95rem;
  color: var(--vtx-accent-gold);
}

.vtx-footer ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.vtx-footer li {
  margin-bottom: 8px;
}

.vtx-footer a {
  color: var(--vtx-text-muted);
  font-size: 0.88rem;
}

.vtx-footer-copy {
  grid-column: 1 / -1;
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid var(--vtx-border);
  font-size: 0.8rem;
  color: var(--vtx-text-muted);
}

/* Responsive */
@media (max-width: 768px) {
  .vtx-nav-toggle {
    display: block;
  }

  .vtx-nav-panel {
    display: none;
    position: absolute;
    top: var(--vtx-header-h);
    left: 0;
    right: 0;
    flex-direction: column;
    background: rgba(12, 8, 32, 0.98);
    padding: 12px 18px 18px;
    border-bottom: 1px solid var(--vtx-border);
  }

  .vtx-nav-panel.vtx-open {
    display: flex;
  }

  .vtx-header-inner {
    position: relative;
  }

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

  .vtx-feature-row.vtx-reverse {
    direction: ltr;
  }

  .vtx-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .vtx-dl-tile {
    width: calc(25% - 8px);
  }

  .vtx-footer-inner {
    grid-template-columns: 1fr;
  }
}

@media (min-width: 769px) {
  .vtx-dl-tile {
    width: calc(12.5% - 8px);
  }
}