:root {
  --bg: #06060e;
  --bg2: #0b0b18;
  --panel: #0f0f1e;
  --panel2: #14142a;
  --cyan: #00f0ff;
  --magenta: #ff2bd6;
  --purple: #7c5cff;
  --text: #e9e9f6;
  --muted: #9c9cbb;
  --line: rgba(0, 240, 255, 0.16);
  --grad: linear-gradient(135deg, #00f0ff, #7c5cff, #ff2bd6);
  --mono: "SF Mono", "JetBrains Mono", Menlo, Consolas, monospace;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", -apple-system, "Segoe UI", sans-serif;
  background-color: var(--bg);
  background-image:
    linear-gradient(rgba(0, 240, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0, 240, 255, 0.04) 1px, transparent 1px);
  background-size: 44px 44px;
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 9998;
  background: repeating-linear-gradient(0deg, rgba(255, 255, 255, 0.015) 0 1px, transparent 1px 3px);
}

.hl {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 6, 14, 0.82);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  max-width: 1180px;
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 28px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
}

.logo-mark {
  width: 26px;
  height: 26px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  position: relative;
  box-shadow: 0 0 12px rgba(0, 240, 255, 0.6);
}

.logo-mark::before,
.logo-mark::after {
  content: "";
  position: absolute;
  background: var(--cyan);
}

.logo-mark::before { left: -5px; right: -5px; top: 50%; height: 2px; margin-top: -1px; }
.logo-mark::after { top: -5px; bottom: -5px; left: 50%; width: 2px; margin-left: -1px; }

.main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: auto;
}

.main-nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 15px;
  transition: color 0.2s;
}

.main-nav a:hover { color: var(--cyan); }

.nav-cta {
  padding: 9px 20px;
  border-radius: 6px;
  background: var(--grad);
  color: #05050c;
  text-decoration: none;
  font-weight: 700;
  font-size: 14px;
  box-shadow: 0 0 18px rgba(0, 240, 255, 0.35);
  white-space: nowrap;
}

.nav-toggle {
  display: none;
  background: none;
  border: 1px solid var(--line);
  color: var(--cyan);
  font-size: 20px;
  width: 42px;
  height: 42px;
  border-radius: 6px;
  cursor: pointer;
}

/* ---------- hero ---------- */
.hero {
  position: relative;
  padding: 96px 22px 80px;
  text-align: center;
  overflow: hidden;
}

.hero::before,
.hero::after {
  content: "";
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  z-index: 0;
  pointer-events: none;
}

.hero::before {
  width: 480px; height: 480px;
  background: rgba(0, 240, 255, 0.16);
  top: -160px; left: 8%;
}

.hero::after {
  width: 480px; height: 480px;
  background: rgba(255, 43, 214, 0.14);
  bottom: -200px; right: 6%;
}

.hero-inner { position: relative; z-index: 1; max-width: 900px; margin: 0 auto; }

.eyebrow {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.28em;
  color: var(--cyan);
  text-transform: uppercase;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--magenta);
  box-shadow: 0 0 12px var(--magenta);
  animation: pulse 1.6s ease-in-out infinite;
}

@keyframes pulse {
  0%, to { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.8); }
}

.hero h1 {
  font-size: clamp(44px, 8vw, 84px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.12;
  margin: 22px 0 20px;
  text-shadow: -2px 0 rgba(0, 240, 255, 0.45), 2px 0 rgba(255, 43, 214, 0.45);
}

.glitch { position: relative; display: inline-block; }

.glitch::before,
.glitch::after {
  content: attr(data-text);
  position: absolute;
  left: 0; right: 0; top: 0;
  overflow: hidden;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.glitch::before {
  background: var(--grad);
  animation: glitch-a 3s infinite linear alternate;
}

.glitch::after {
  background: var(--grad);
  animation: glitch-b 2.7s infinite linear alternate;
}

@keyframes glitch-a {
  0%, 92% { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
  93% { transform: translate(-3px, 1px); clip-path: inset(10% 0 60% 0); }
  96% { transform: translate(3px, -1px); clip-path: inset(50% 0 8% 0); }
  to { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
}

@keyframes glitch-b {
  0%, 90% { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
  91% { transform: translate(3px, -1px); clip-path: inset(40% 0 30% 0); }
  95% { transform: translate(-3px, 1px); clip-path: inset(5% 0 70% 0); }
  to { transform: translate(0, 0); clip-path: inset(0 0 0 0); }
}

.hero-sub {
  font-size: clamp(16px, 2.4vw, 20px);
  color: var(--muted);
  max-width: 640px;
  margin: 0 auto 34px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-trust {
  list-style: none;
  display: flex;
  gap: 26px;
  justify-content: center;
  flex-wrap: wrap;
  margin-top: 34px;
  color: var(--muted);
  font-size: 14px;
}

.hero-trust li { position: relative; }
.hero-trust li::before { content: "◆"; color: var(--cyan); margin-right: 7px; font-size: 11px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 15px 34px;
  border-radius: 8px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition: transform 0.2s, box-shadow 0.2s;
  cursor: pointer;
}

.btn-primary {
  background: var(--grad);
  color: #05050c;
  box-shadow: 0 0 26px rgba(0, 240, 255, 0.4);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 42px rgba(0, 240, 255, 0.6);
}

.btn-ghost {
  background: transparent;
  color: var(--cyan);
  border: 1px solid rgba(0, 240, 255, 0.5);
}

.btn-ghost:hover {
  transform: translateY(-2px);
  box-shadow: 0 0 24px rgba(0, 240, 255, 0.3);
}

/* ---------- sections ---------- */
.section {
  max-width: 1180px;
  margin: 0 auto;
  padding: 72px 22px;
}

.section-head { text-align: center; margin-bottom: 46px; }

.section-head h2 {
  font-size: clamp(30px, 5vw, 44px);
  font-weight: 800;
  letter-spacing: -0.01em;
  margin-top: 12px;
}

.section-head .eyebrow { font-size: 12px; }

/* ---------- features ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
}

.feature-card {
  background: linear-gradient(var(--panel), var(--panel)) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  border-radius: 12px;
  padding: 28px 24px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.feature-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5), 0 0 30px rgba(0, 240, 255, 0.18);
}

.feature-num {
  font-family: var(--mono);
  font-size: 30px;
  font-weight: 700;
  color: transparent;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  opacity: 0.9;
}

.feature-card h3 { font-size: 20px; margin: 12px 0 10px; }

.feature-card p { color: var(--muted); font-size: 14.5px; }

/* ---------- gallery ---------- */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.image-gallery figure {
  position: relative;
  aspect-ratio: 16 / 9;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.25s, box-shadow 0.25s;
}

.image-gallery figure:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.5), 0 0 30px rgba(255, 43, 214, 0.16);
}

.image-gallery img {
  position: absolute;
  inset: 0;
  object-fit: cover;
}

.image-gallery figcaption {
  padding: 12px 16px;
  font-size: 14px;
  color: var(--muted);
  border-top: 1px solid var(--line);
  font-family: var(--mono);
  letter-spacing: 0.04em;
}

/* ---------- articles ---------- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 22px;
}

.article-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 26px 26px;
  transition: transform 0.25s, box-shadow 0.25s;
}

.article-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 16px 38px rgba(0, 0, 0, 0.5), 0 0 24px rgba(0, 240, 255, 0.14);
}

.article-tag {
  display: inline-block;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--magenta);
  border: 1px solid rgba(255, 43, 214, 0.4);
  padding: 3px 10px;
  border-radius: 20px;
  margin-bottom: 14px;
}

.article-card h3 { font-size: 18px; margin-bottom: 10px; line-height: 1.5; }

.article-card p { color: var(--muted); font-size: 14.5px; }

/* ---------- FAQ ---------- */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.faq-list details {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  overflow: hidden;
}

.faq-list summary {
  cursor: pointer;
  padding: 18px 22px;
  font-weight: 600;
  font-size: 16px;
  list-style: none;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

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

.faq-list summary::after {
  content: "+";
  font-family: var(--mono);
  color: var(--cyan);
  font-size: 20px;
  transition: transform 0.2s;
}

.faq-list details[open] summary::after { transform: rotate(45deg); }

.faq-list details p {
  padding: 0 22px 18px;
  color: var(--muted);
  font-size: 14.5px;
}

/* ---------- refund ---------- */
.refund-box {
  background: linear-gradient(var(--panel2), var(--panel2)) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 48px 36px;
  text-align: center;
  box-shadow: 0 0 40px rgba(124, 92, 255, 0.2);
}

.refund-box h2 {
  font-size: clamp(26px, 4vw, 38px);
  font-weight: 800;
  margin-bottom: 14px;
}

.refund-box p {
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto 28px;
  font-size: 15px;
}

/* ---------- footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 22px 120px;
  text-align: center;
}

.footer-hot { margin-bottom: 20px; }

.footer-hot-label {
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.footer-hot-words {
  color: var(--muted);
  font-size: 13px;
  line-height: 2;
}

.copyright { color: #5f5f7d; font-size: 13px; }

/* ---------- mobile cta ---------- */
.mobile-cta {
  display: none;
  position: fixed;
  left: 0; right: 0; bottom: 0;
  z-index: 200;
  padding: 12px 16px;
  background: rgba(6, 6, 14, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--line);
}

.mobile-cta .btn { display: flex; }

body:has(.mobile-cta) { padding-bottom: 0; }

/* ---------- responsive ---------- */
@media (max-width: 900px) {
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .image-gallery { grid-template-columns: 1fr; }
}

@media (max-width: 640px) {
  .header-inner { gap: 14px; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav-cta { display: none; }
  .main-nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    background: rgba(8, 8, 18, 0.98);
    border-bottom: 1px solid var(--line);
    display: none;
    padding: 8px 0;
  }
  .main-nav.open { display: flex; }
  .main-nav a { padding: 14px 22px; border-top: 1px solid rgba(255, 255, 255, 0.04); }
  .article-grid { grid-template-columns: 1fr; }
  .hero { padding: 60px 18px 60px; }
  .mobile-cta { display: block; }
  .site-footer { padding-bottom: 96px; }
  .btn { padding: 16px 26px; font-size: 17px; }
}

/* ---------- download page ---------- */
.hero-dl,
.hero-refund { padding: 64px 22px 40px; }

.dl-section { padding-top: 8px; }

.device-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

.device-card {
  background: linear-gradient(var(--panel), var(--panel)) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 34px 26px;
  text-align: center;
}

.device-icon {
  font-size: 40px;
  color: var(--cyan);
  display: inline-block;
  text-shadow: 0 0 18px rgba(0, 240, 255, 0.7);
  margin-bottom: 10px;
}

.device-card h2 { font-size: 24px; margin-bottom: 10px; }

.device-card p { color: var(--muted); font-size: 14.5px; margin-bottom: 24px; min-height: 46px; }

.device-card .btn { display: flex; }

/* ---------- refund page ---------- */
.refund-section { padding-top: 8px; }

.refund-panel {
  max-width: 620px;
  margin: 0 auto;
  background: linear-gradient(var(--panel2), var(--panel2)) padding-box, var(--grad) border-box;
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 36px 32px;
  box-shadow: 0 0 40px rgba(124, 92, 255, 0.18);
}

.refund-tip {
  text-align: center;
  color: var(--cyan);
  font-size: 15px;
  margin-bottom: 26px;
}

.refund-form {
  display: flex;
  flex-direction: column;
}

.refund-form label {
  font-size: 14px;
  color: var(--muted);
  margin: 18px 0 8px;
}

.refund-form input,
.refund-form textarea {
  box-sizing: border-box;
  background: var(--bg2);
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--text);
  padding: 13px 15px;
  font-size: 15px;
  font-family: inherit;
  resize: vertical;
}

.refund-form input:focus,
.refund-form textarea:focus {
  outline: none;
  border-color: var(--cyan);
  box-shadow: 0 0 14px rgba(0, 240, 255, 0.3);
}

.refund-form .btn { margin-top: 26px; }

.refund-msg {
  margin-top: 18px;
  text-align: center;
  color: var(--cyan);
  font-size: 15px;
  padding: 14px;
  border: 1px solid rgba(0, 240, 255, 0.3);
  border-radius: 8px;
  background: rgba(0, 240, 255, 0.06);
}

@media (max-width: 900px) {
  .device-grid { grid-template-columns: 1fr; }
  .device-card p { min-height: 0; }
}

/* ---------- article pages ---------- */
.article-card h3 a { color: var(--text); text-decoration: none; }
.article-card h3 a:hover { color: var(--cyan); }

.article-more {
  display: inline-block;
  margin-top: 14px;
  color: var(--cyan);
  text-decoration: none;
  font-size: 14px;
  font-weight: 600;
}
.article-more:hover { color: var(--magenta); }

.breadcrumb {
  max-width: 1180px;
  margin: 22px auto 0;
  padding: 0 22px;
  font-size: 14px;
  color: var(--muted);
}
.breadcrumb a { color: var(--muted); text-decoration: none; }
.breadcrumb a:hover { color: var(--cyan); }
.breadcrumb .sep { margin: 0 8px; color: #5f5f7d; }
.breadcrumb .cur { color: var(--text); }

.article-page {
  max-width: 820px;
  margin: 0 auto;
  padding: 34px 22px 10px;
}
.article-page h1 {
  font-size: clamp(26px, 4.5vw, 36px);
  font-weight: 800;
  line-height: 1.4;
  margin-bottom: 14px;
}
.article-meta {
  font-family: var(--mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  margin-bottom: 26px;
}
.article-page p {
  color: var(--muted);
  font-size: 16px;
  line-height: 2;
  margin-bottom: 20px;
}
.article-page p a { color: var(--cyan); text-decoration: none; }
.article-page p a:hover { text-decoration: underline; }

.other-guides {
  max-width: 820px;
  margin: 0 auto;
  padding: 10px 22px 30px;
}
.other-guides h2 { font-size: 22px; margin-bottom: 18px; }
.other-guides-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.guide-card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 18px 16px;
  transition: transform 0.25s, box-shadow 0.25s;
}
.guide-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(0, 0, 0, 0.5), 0 0 22px rgba(0, 240, 255, 0.14);
}
.guide-card a { color: var(--text); text-decoration: none; font-size: 15px; font-weight: 600; line-height: 1.6; }
.guide-card a:hover { color: var(--cyan); }

@media (max-width: 900px) {
  .other-guides-grid { grid-template-columns: 1fr; }
}