*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --dvm-black: #000000;
  --dvm-ink: #0a0a0f;
  --dvm-panel: #12121a;
  --dvm-line: rgba(255, 255, 255, 0.07);
  --dvm-cyan: #25f4ee;
  --dvm-red: #fe2c55;
  --dvm-magenta: #ff0050;
  --dvm-white: #f5f5f7;
  --dvm-muted: #8e8e9a;
  --dvm-gold: #ffd60a;
  --dvm-nav: 52px;
  --dvm-fixed: 0px;
  --dvm-font: "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
}

html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--dvm-font);
  background: var(--dvm-black);
  color: var(--dvm-white);
  line-height: 1.82;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body.has-fixed-dl { padding-top: var(--dvm-fixed); }

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

a { color: var(--dvm-cyan); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--dvm-red); }

.dvm-wrap { width: min(1080px, 92vw); margin: 0 auto; }

/* Header */
.dvm-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 900;
  height: var(--dvm-nav);
  background: rgba(0, 0, 0, 0.75);
  backdrop-filter: blur(18px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, box-shadow 0.3s;
}

.dvm-header.is-scrolled {
  border-color: var(--dvm-line);
  box-shadow: 0 6px 28px rgba(254, 44, 85, 0.08);
}

.dvm-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  gap: 12px;
}

.dvm-logo img { height: 28px; width: auto; }

.dvm-nav {
  display: flex;
  gap: 1.2rem;
  font-size: 0.84rem;
}

.dvm-nav a { color: var(--dvm-muted); font-weight: 500; }
.dvm-nav a:hover, .dvm-nav a.is-on { color: var(--dvm-cyan); }
.dvm-nav a.is-on { font-weight: 700; }

.dvm-btn-dl {
  display: inline-flex;
  align-items: center;
  padding: 7px 18px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--dvm-red), var(--dvm-magenta));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(254, 44, 85, 0.35);
}

.dvm-btn-dl:hover { color: #fff; filter: brightness(1.1); }

.dvm-menu-btn {
  display: none;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--dvm-line);
  border-radius: 8px;
  cursor: pointer;
  padding: 8px 10px;
}

.dvm-menu-btn span {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--dvm-cyan);
  margin: 4px 0;
  border-radius: 2px;
}

/* Mobile drawer */
.dvm-drawer {
  position: fixed;
  top: var(--dvm-nav);
  left: 0;
  right: 0;
  background: var(--dvm-ink);
  border-bottom: 1px solid var(--dvm-line);
  padding: 16px 4vw;
  display: none;
  flex-direction: column;
  gap: 10px;
  z-index: 899;
  transform: translateY(-110%);
  transition: transform 0.28s;
}

.dvm-drawer.is-open {
  display: flex;
  transform: translateY(0);
}

.dvm-drawer a {
  color: var(--dvm-muted);
  font-size: 0.92rem;
  padding: 8px 0;
  border-bottom: 1px solid var(--dvm-line);
}

.dvm-drawer a:last-child { border: none; }

/* Fixed download bar */
.dvm-fixed-dl {
  position: fixed;
  top: var(--dvm-nav);
  left: 0;
  right: 0;
  z-index: 898;
  background: rgba(10, 10, 15, 0.96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--dvm-line);
  padding: 8px 4vw;
  transform: translateY(-120%);
  opacity: 0;
  transition: transform 0.3s, opacity 0.3s;
  pointer-events: none;
}

.dvm-fixed-dl.is-show {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.dvm-fixed-dl-inner {
  display: flex;
  justify-content: center;
  width: 100%;
}

.dvm-hidden { display: none !important; }

/* Top intro: download + hero unified */
.dvm-intro {
  position: relative;
  isolation: isolate;
  padding: calc(var(--dvm-nav) + 16px) 0 40px;
  scroll-margin-top: var(--dvm-nav);
  overflow: hidden;
}

.dvm-intro::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 55% at 15% 0%, rgba(37, 244, 238, 0.11), transparent 58%),
    radial-gradient(ellipse 70% 50% at 88% 8%, rgba(254, 44, 85, 0.13), transparent 55%),
    var(--dvm-black);
  pointer-events: none;
}

.dvm-intro > .dvm-wrap {
  position: relative;
  z-index: 1;
}

.dvm-dl-zone {
  padding: 0;
}

.dvm-dl-zone:not(.dvm-intro) {
  position: relative;
  isolation: isolate;
  padding: calc(var(--dvm-nav) + 16px) 0 20px;
  overflow: hidden;
}

.dvm-dl-zone:not(.dvm-intro)::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background:
    radial-gradient(ellipse 80% 55% at 15% 0%, rgba(37, 244, 238, 0.11), transparent 58%),
    radial-gradient(ellipse 70% 50% at 88% 8%, rgba(254, 44, 85, 0.13), transparent 55%),
    var(--dvm-black);
  pointer-events: none;
}

.dvm-dl-zone:not(.dvm-intro) > .dvm-wrap {
  position: relative;
  z-index: 1;
}

.dvm-dl-card {
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 18px;
  padding: 22px 18px;
  text-align: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 0;
}

.dvm-dl-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--dvm-cyan), var(--dvm-red), var(--dvm-cyan));
}

.dvm-dl-card h1, .dvm-dl-card h2 {
  font-size: 1.1rem;
  margin-bottom: 8px;
  background: linear-gradient(90deg, var(--dvm-cyan), var(--dvm-white));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.dvm-dl-card p {
  color: var(--dvm-muted);
  font-size: 0.84rem;
  margin-bottom: 14px;
}

/* Ads grid - 4 per row */
#ads, .dvm-ads-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: flex-start;
  width: 296px;
  max-width: 100%;
  margin: 0 auto;
}

.dvm-ad-item {
  flex: 0 0 25%;
  width: 25%;
  max-width: 25%;
  display: flex;
  flex-direction: column;
  align-items: center;
  padding: 6px 2px;
  box-sizing: border-box;
}

.dvm-ad-item img {
  width: 65px;
  height: 65px;
  object-fit: cover;
  border-radius: 18px;
  box-shadow: 0 6px 18px rgba(24, 24, 24, 0.12);
  transition: transform 0.18s;
}

.dvm-ad-item a:hover img {
  transform: translateY(-4px) scale(1.04);
}

.dvm-ad-cap {
  font-size: 10px;
  color: var(--dvm-muted);
  text-align: center;
  margin-top: 4px;
  width: 100%;
  max-width: 72px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Hero block inside intro */
.dvm-hero-block {
  padding: 28px 0 0;
  margin-top: 20px;
  border-top: 1px solid var(--dvm-line);
  position: relative;
  clear: both;
}

.dvm-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 0.72rem;
  color: var(--dvm-cyan);
  background: rgba(37, 244, 238, 0.08);
  border: 1px solid rgba(37, 244, 238, 0.25);
  margin-bottom: 16px;
}

.dvm-hero-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--dvm-red);
  animation: dvm-pulse 1.5s infinite;
}

@keyframes dvm-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(0.85); }
}

.dvm-hero-title {
  font-size: clamp(1.6rem, 5vw, 2.2rem);
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 14px;
  letter-spacing: -0.02em;
}

.dvm-hero-title em {
  font-style: normal;
  color: var(--dvm-red);
  text-shadow: 2px 0 var(--dvm-cyan), -2px 0 var(--dvm-magenta);
}

.dvm-hero-desc {
  color: var(--dvm-muted);
  font-size: 0.94rem;
  max-width: 680px;
  margin-bottom: 22px;
}

.dvm-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.dvm-tag {
  padding: 6px 14px;
  border-radius: 8px;
  font-size: 0.76rem;
  color: var(--dvm-muted);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--dvm-line);
}

.dvm-tag.is-hot {
  color: #fff;
  background: linear-gradient(135deg, rgba(254, 44, 85, 0.3), rgba(37, 244, 238, 0.15));
  border-color: rgba(254, 44, 85, 0.4);
}

/* 3:7 split sections */
.dvm-split {
  padding: 40px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-split-grid {
  display: grid;
  grid-template-columns: 3fr 7fr;
  gap: 28px;
  align-items: center;
}

.dvm-split-grid.is-reverse .dvm-split-visual { order: 2; }
.dvm-split-grid.is-reverse .dvm-split-body { order: 1; }

.dvm-split-visual { position: relative; }

.dvm-phone-frame {
  border-radius: 20px;
  overflow: hidden;
  border: 2px solid var(--dvm-line);
  box-shadow:
    0 24px 60px rgba(0, 0, 0, 0.6),
    0 0 40px rgba(37, 244, 238, 0.06),
    0 0 40px rgba(254, 44, 85, 0.06);
  position: relative;
}

.dvm-phone-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: 18px;
  border: 1px solid rgba(37, 244, 238, 0.15);
  pointer-events: none;
}

.dvm-split-label {
  display: inline-block;
  font-size: 0.7rem;
  padding: 4px 10px;
  border-radius: 6px;
  background: rgba(254, 44, 85, 0.12);
  color: var(--dvm-red);
  margin-bottom: 10px;
  font-weight: 600;
  letter-spacing: 0.04em;
}

.dvm-split-body h2 {
  font-size: 1.26rem;
  margin-bottom: 12px;
  line-height: 1.4;
}

.dvm-split-body p {
  color: var(--dvm-muted);
  font-size: 0.9rem;
  margin-bottom: 10px;
}

.dvm-split-body ul {
  margin: 8px 0 14px 18px;
  color: var(--dvm-muted);
  font-size: 0.88rem;
}

.dvm-split-body li { margin-bottom: 6px; }

.dvm-link-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--dvm-cyan);
  margin-top: 6px;
}

.dvm-link-btn:hover { color: var(--dvm-red); }

/* Category scroll */
.dvm-cat-scroll {
  padding: 36px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-cat-scroll h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  text-align: center;
}

.dvm-cat-lead {
  text-align: center;
  color: var(--dvm-muted);
  font-size: 0.86rem;
  margin-bottom: 20px;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

.dvm-cat-track {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 14px;
  padding: 4px 0 8px;
}

.dvm-cat-card {
  display: flex;
  flex-direction: column;
  min-width: 0;
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.dvm-cat-card:hover {
  border-color: rgba(37, 244, 238, 0.3);
  transform: translateY(-3px);
}

.dvm-cat-card img {
  aspect-ratio: 9 / 16;
  object-fit: cover;
  width: 100%;
  height: auto;
}

.dvm-cat-card span {
  display: block;
  padding: 10px 8px;
  font-size: 0.78rem;
  color: var(--dvm-muted);
  text-align: center;
  line-height: 1.4;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* Prose SEO block */
.dvm-prose {
  padding: 44px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-prose h2 {
  font-size: 1.22rem;
  margin-bottom: 16px;
  color: var(--dvm-white);
}

.dvm-prose h3 {
  font-size: 1.02rem;
  margin: 22px 0 10px;
  color: var(--dvm-cyan);
}

.dvm-prose p {
  color: var(--dvm-muted);
  font-size: 0.9rem;
  margin-bottom: 12px;
}

.dvm-prose ul, .dvm-prose ol {
  margin: 10px 0 14px 20px;
  color: var(--dvm-muted);
  font-size: 0.88rem;
}

.dvm-prose li { margin-bottom: 6px; }

/* SEO text columns */
.dvm-seo-columns {
  padding: 40px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-seo-columns h2 {
  font-size: 1.2rem;
  margin-bottom: 20px;
  text-align: center;
}

.dvm-seo-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.dvm-seo-card {
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 14px;
  padding: 20px 18px;
}

.dvm-seo-card h3 {
  font-size: 0.98rem;
  color: var(--dvm-cyan);
  margin-bottom: 10px;
}

.dvm-seo-card p {
  color: var(--dvm-muted);
  font-size: 0.88rem;
  margin-bottom: 8px;
}

.dvm-seo-card ul {
  margin: 6px 0 0 16px;
  color: var(--dvm-muted);
  font-size: 0.84rem;
}

.dvm-seo-card li { margin-bottom: 5px; }

/* Image gallery band */
.dvm-gallery {
  padding: 40px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-gallery h2 {
  font-size: 1.2rem;
  margin-bottom: 8px;
  text-align: center;
}

.dvm-gallery-lead {
  text-align: center;
  color: var(--dvm-muted);
  font-size: 0.88rem;
  margin-bottom: 22px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.dvm-gallery-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.dvm-gallery-item {
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 14px;
  overflow: hidden;
  transition: border-color 0.2s;
}

.dvm-gallery-item:hover { border-color: rgba(37, 244, 238, 0.25); }

.dvm-gallery-item img {
  aspect-ratio: 9/16;
  object-fit: cover;
  width: 100%;
}

.dvm-gallery-item figcaption {
  padding: 10px 12px;
  font-size: 0.8rem;
  color: var(--dvm-muted);
  line-height: 1.5;
}

.dvm-gallery-item strong {
  display: block;
  color: var(--dvm-white);
  font-size: 0.86rem;
  margin-bottom: 4px;
}

/* Stats row */
.dvm-stats {
  padding: 32px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.dvm-stat {
  text-align: center;
  padding: 18px 10px;
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 14px;
}

.dvm-stat strong {
  display: block;
  font-size: 1.4rem;
  color: var(--dvm-cyan);
  margin-bottom: 4px;
}

.dvm-stat span {
  font-size: 0.76rem;
  color: var(--dvm-muted);
}

/* FAQ */
.dvm-faq {
  padding: 40px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-faq h2 {
  font-size: 1.2rem;
  margin-bottom: 18px;
  text-align: center;
}

.dvm-faq-item {
  border: 1px solid var(--dvm-line);
  border-radius: 12px;
  margin-bottom: 10px;
  overflow: hidden;
  background: var(--dvm-panel);
}

.dvm-faq-q {
  width: 100%;
  text-align: left;
  padding: 14px 18px;
  background: none;
  border: none;
  color: var(--dvm-white);
  font-size: 0.9rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-family: inherit;
}

.dvm-faq-q::after {
  content: "+";
  color: var(--dvm-cyan);
  font-size: 1.2rem;
  transition: transform 0.2s;
}

.dvm-faq-item.is-open .dvm-faq-q::after { transform: rotate(45deg); }

.dvm-faq-a {
  display: none;
  padding: 0 18px 14px;
  color: var(--dvm-muted);
  font-size: 0.86rem;
}

.dvm-faq-item.is-open .dvm-faq-a { display: block; }

/* Guide steps */
.dvm-steps {
  padding: 40px 0;
  border-top: 1px solid var(--dvm-line);
}

.dvm-steps h2 {
  font-size: 1.2rem;
  margin-bottom: 22px;
  text-align: center;
}

.dvm-step-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
}

.dvm-step {
  background: var(--dvm-panel);
  border: 1px solid var(--dvm-line);
  border-radius: 14px;
  padding: 18px 14px;
  text-align: center;
  position: relative;
}

.dvm-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--dvm-red), var(--dvm-magenta));
  color: #fff;
  font-size: 0.82rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.dvm-step h3 {
  font-size: 0.88rem;
  margin-bottom: 6px;
}

.dvm-step p {
  font-size: 0.78rem;
  color: var(--dvm-muted);
}

/* Footer */
.dvm-footer {
  padding: 36px 0 28px;
  border-top: 1px solid var(--dvm-line);
  background: var(--dvm-ink);
}

.dvm-footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 28px;
  margin-bottom: 24px;
}

.dvm-footer h3 {
  font-size: 0.88rem;
  margin-bottom: 12px;
  color: var(--dvm-white);
}

.dvm-footer p, .dvm-footer a {
  font-size: 0.8rem;
  color: var(--dvm-muted);
  display: block;
  margin-bottom: 6px;
}

.dvm-footer a:hover { color: var(--dvm-cyan); }

.dvm-footer-bottom {
  text-align: center;
  font-size: 0.76rem;
  color: var(--dvm-muted);
  padding-top: 18px;
  border-top: 1px solid var(--dvm-line);
}

/* Sub pages */
.dvm-page-hero {
  padding: calc(var(--dvm-nav) + 32px) 0 28px;
  text-align: center;
}

.dvm-page-hero h1 {
  font-size: 1.5rem;
  margin-bottom: 10px;
}

.dvm-page-hero p {
  color: var(--dvm-muted);
  font-size: 0.9rem;
}

.dvm-legal {
  padding: 0 0 48px;
}

.dvm-legal h2 {
  font-size: 1.05rem;
  margin: 24px 0 10px;
  color: var(--dvm-cyan);
}

.dvm-legal p, .dvm-legal li {
  color: var(--dvm-muted);
  font-size: 0.88rem;
  margin-bottom: 10px;
}

.dvm-legal ul, .dvm-legal ol {
  margin: 8px 0 12px 20px;
}

/* Error pages */
.dvm-error {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: calc(var(--dvm-nav) + 20px) 4vw 40px;
}

.dvm-error-code {
  font-size: 5rem;
  font-weight: 900;
  background: linear-gradient(135deg, var(--dvm-cyan), var(--dvm-red));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}

.dvm-error h1 {
  font-size: 1.3rem;
  margin-bottom: 10px;
}

.dvm-error p {
  color: var(--dvm-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
  max-width: 420px;
}

.dvm-error .dvm-dl-zone {
  width: 100%;
  max-width: 480px;
  padding-top: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .dvm-nav, .dvm-btn-dl--desktop { display: none; }
  .dvm-menu-btn { display: block; }

  .dvm-split-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .dvm-split-grid.is-reverse .dvm-split-visual { order: 0; }
  .dvm-split-grid.is-reverse .dvm-split-body { order: 0; }

  .dvm-split-visual { max-width: 220px; margin: 0 auto; }

  .dvm-cat-track {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding-bottom: 12px;
  }

  .dvm-cat-track::-webkit-scrollbar { display: none; }

  .dvm-cat-card {
    flex: 0 0 132px;
    scroll-snap-align: start;
  }

  .dvm-stats-grid { grid-template-columns: repeat(2, 1fr); }
  .dvm-step-list { grid-template-columns: repeat(2, 1fr); }
  .dvm-footer-grid { grid-template-columns: 1fr; }
  .dvm-seo-grid { grid-template-columns: 1fr; }
  .dvm-gallery-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (min-width: 769px) {
  .dvm-btn-dl--desktop { display: inline-flex; }
}