:root {
  color-scheme: dark;
  --ink: #f1f5f9;
  --muted: #94a3b8;
  --panel: #0f0f1a;
  --panel-2: #161628;
  --line: rgba(148, 163, 184, 0.12);
  --purple: #8b5cf6;
  --purple-glow: rgba(139, 92, 246, 0.35);
  --cyan: #06d6a0;
  --cyan-glow: rgba(6, 214, 160, 0.3);
  --pink: #ec4899;
  --bg: #06060f;
  --shadow: 0 24px 80px rgba(0, 0, 0, 0.5);
  --radius-sm: 12px;
  --radius: 20px;
  --radius-lg: 28px;
  font-family: "Inter", "PingFang SC", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  min-width: 320px;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.7;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(ellipse 80% 60% at 50% 10%, rgba(139, 92, 246, 0.10), transparent),
    radial-gradient(ellipse 60% 50% at 85% 60%, rgba(6, 214, 160, 0.06), transparent),
    radial-gradient(ellipse 50% 40% at 15% 80%, rgba(236, 72, 153, 0.05), transparent),
    #06060f;
}

a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }

/* --- HEADER --- */
.topbar,
.guide-header {
  width: min(1200px, calc(100% - 40px));
  min-height: 72px;
  margin: 20px auto 0;
  padding: 10px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 15, 26, 0.7);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
}

.topbar { position: sticky; top: 16px; z-index: 10; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-width: max-content;
}

.brand-mark {
  width: 44px;
  height: 44px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--purple), #7c3aed);
  color: #fff;
  font-weight: 900;
  font-size: 18px;
  border-radius: 14px;
}

.brand strong,
.brand small { display: block; }

.brand strong { font-size: 16px; }

.brand small { color: var(--muted); font-size: 12px; }

.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 500;
}

.nav-links a {
  transition: color 0.2s;
  position: relative;
}

.nav-links a:hover { color: var(--ink); }

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--purple);
  border-radius: 2px;
  transition: width 0.25s ease;
}

.nav-links a:hover::after { width: 100%; }

/* --- BUTTONS --- */
.top-action,
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 24px;
  border: 1px solid transparent;
  font-weight: 700;
  font-size: 14px;
  white-space: nowrap;
  border-radius: 14px;
  transition: all 0.25s ease;
  cursor: pointer;
}

.top-action,
.btn.primary {
  background: linear-gradient(135deg, var(--purple), #7c3aed);
  color: #fff;
  box-shadow: 0 8px 32px var(--purple-glow);
}

.btn.primary:hover,
.top-action:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(139, 92, 246, 0.5);
}

.btn.ghost {
  border-color: rgba(241, 245, 249, 0.2);
  color: var(--ink);
  background: transparent;
}

.btn.ghost:hover {
  border-color: var(--purple);
  background: rgba(139, 92, 246, 0.08);
}

.btn.dark {
  border-color: var(--line);
  background: var(--panel);
  color: var(--ink);
}

.btn.dark:hover {
  border-color: var(--purple);
  background: rgba(139, 92, 246, 0.1);
}

.btn.cyan {
  background: linear-gradient(135deg, var(--cyan), #05b88a);
  color: #000;
  box-shadow: 0 8px 32px var(--cyan-glow);
}

.btn.cyan:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 40px rgba(6, 214, 160, 0.45);
}

/* --- LAYOUT HELPERS --- */
.section-band,
.section-wrap {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
}

/* --- HERO --- */
.hero {
  min-height: calc(100vh - 120px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 60px 0 40px;
  position: relative;
}

.hero-copy {
  max-width: 800px;
  z-index: 1;
}

.hero-copy h1,
.guide-hero h1,
.refund-intro h1 {
  margin: 12px 0 20px;
  font-size: clamp(48px, 7vw, 96px);
  line-height: 1;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #fff 30%, var(--purple) 70%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-lead,
.section-heading p,
.content-block p,
.refund-callout p,
.final-cta p,
.guide-hero p,
.refund-intro p,
.device-card p,
.refund-strip p,
.refund-note p,
.audience-card p,
.workflow-step p,
.detail-row p,
.faq-item p,
.guide-note p {
  color: var(--muted);
}

.hero-lead {
  max-width: 600px;
  margin: 0 auto;
  font-size: clamp(16px, 2vw, 20px);
  line-height: 1.65;
}

.eyebrow,
.label {
  margin: 0;
  color: var(--cyan);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.18em;
  text-transform: uppercase;
}

.hero-actions,
.final-cta,
.refund-strip {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
}

.hero-actions {
  margin-top: 32px;
  justify-content: center;
}

.hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 40px;
  flex-wrap: wrap;
}

.hero-stats span {
  min-width: 140px;
  padding: 16px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(15, 15, 26, 0.6);
  backdrop-filter: blur(12px);
}

.hero-stats strong {
  display: block;
  color: var(--purple);
  font-size: 28px;
  line-height: 1.1;
  margin-bottom: 2px;
}

.hero-visual {
  position: relative;
  width: min(720px, 100%);
  margin-top: 40px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.03);
  box-shadow: 0 0 80px rgba(139, 92, 246, 0.08);
}

.hero-visual img {
  width: 100%;
  aspect-ratio: 1.6;
  object-fit: cover;
  border-radius: calc(var(--radius-lg) - 10px);
}

.status-strip {
  position: absolute;
  left: 24px;
  right: 24px;
  bottom: 24px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}

.status-strip span {
  min-height: 40px;
  display: grid;
  place-items: center;
  background: rgba(6, 6, 15, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.18);
  border-radius: 10px;
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  backdrop-filter: blur(16px);
}

/* --- SECTION HEADINGS --- */
.section-wrap { padding: 80px 0; }

.section-heading {
  max-width: 720px;
  margin: 0 auto 40px;
  text-align: center;
}

.section-heading.compact { margin: 0 auto 40px; }

.section-heading h2,
.content-block h2,
.refund-callout h3,
.final-cta h2,
.refund-strip h2,
.refund-note h2 {
  margin: 8px 0 14px;
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.1;
  letter-spacing: -0.01em;
}

/* --- AUDIENCE CARDS --- */
.audience-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.audience-card {
  min-height: 220px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.06), rgba(15, 15, 26, 0.4));
  transition: all 0.3s ease;
}

.audience-card::before {
  content: "";
  display: block;
  width: 40px;
  height: 4px;
  background: var(--purple);
  border-radius: 2px;
  margin-bottom: 20px;
}

.audience-card h3,
.workflow-step h3,
.faq-item h3,
.guide-note h2 {
  margin: 0 0 10px;
  font-size: 20px;
  line-height: 1.3;
}

/* --- FEATURE GRID --- */
.feature-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.feature-tile {
  min-height: 240px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 15, 26, 0.7), rgba(15, 15, 26, 0.3));
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  transition: all 0.3s ease;
  position: relative;
  overflow: hidden;
}

.feature-tile::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: radial-gradient(circle at top right, rgba(139, 92, 246, 0.12), transparent);
  border-radius: 0 0 0 80px;
}

.tile-index {
  color: var(--purple);
  font-weight: 900;
  font-size: 14px;
  letter-spacing: 0.04em;
}

.feature-tile h3,
.device-card h2 {
  margin: 16px 0 10px;
  font-size: 20px;
}

.feature-tile p { margin: 0; color: var(--muted); position: relative; z-index: 1; }

/* --- WORKFLOW --- */
.workflow-section { padding: 80px 0; }

.workflow-rail {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
  position: relative;
}

.workflow-rail::before {
  content: "";
  position: absolute;
  top: 46px;
  left: 8%;
  right: 8%;
  height: 2px;
  background: linear-gradient(90deg, var(--purple), var(--cyan), var(--pink), var(--purple));
  border-radius: 1px;
  z-index: 0;
}

.workflow-step {
  min-height: 260px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  z-index: 1;
  transition: all 0.3s ease;
}

.workflow-step span {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border: 2px solid var(--purple);
  border-radius: 50%;
  color: var(--purple);
  font-weight: 900;
  font-size: 18px;
  background: var(--bg);
  flex-shrink: 0;
}

.workflow-step h3 { margin: 18px 0 8px; }

/* --- DETAIL MATRIX --- */
.detail-matrix { display: grid; gap: 12px; }

.detail-row {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 20px;
  align-items: start;
  padding: 24px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(90deg, rgba(139, 92, 246, 0.05), rgba(15, 15, 26, 0.3));
}

.detail-row strong { color: var(--purple); font-size: 20px; }
.detail-row p { margin: 0; }

/* --- GALLERY --- */
.gallery-section { padding: 80px 0; }

.image-gallery {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}

.image-gallery figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--panel);
  overflow: hidden;
  transition: all 0.3s ease;
}

.image-gallery img {
  width: 100%;
  height: 340px;
  object-fit: cover;
}

.image-gallery figcaption {
  padding: 16px 20px;
  color: var(--muted);
  font-size: 14px;
}

/* --- SPLIT PANEL (refund callout) --- */
.split-panel {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 20px;
  align-items: stretch;
}

/* --- FAQ --- */
.faq-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.faq-item {
  min-height: 180px;
  padding: 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 15, 26, 0.5), rgba(15, 15, 26, 0.25));
  transition: border-color 0.3s;
}

.faq-item:hover { border-color: var(--purple); }

/* --- CONTENT BLOCK --- */
.content-block { padding: 12px 0; }

.check-list {
  padding: 0;
  margin: 24px 0 0;
  list-style: none;
}

.check-list li {
  position: relative;
  margin: 12px 0;
  padding-left: 26px;
  color: var(--muted);
}

.check-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 12px;
  height: 2px;
  background: var(--cyan);
  border-radius: 1px;
}

/* --- REFUND CALLOUT --- */
.refund-callout,
.refund-note {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.12), rgba(15, 15, 26, 0.4));
}

.refund-callout .btn,
.refund-note .btn { margin-top: 20px; }

/* --- FINAL CTA --- */
.final-cta,
.refund-strip {
  justify-content: space-between;
  padding: 40px;
  margin-bottom: 60px;
  border: 1px solid rgba(139, 92, 246, 0.25);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(139, 92, 246, 0.15), rgba(6, 214, 160, 0.06));
  backdrop-filter: blur(12px);
}

.final-cta div,
.refund-strip div { max-width: 720px; }

/* --- FOOTER --- */
.site-footer {
  width: min(1200px, calc(100% - 40px));
  margin: 0 auto;
  padding: 28px 0 48px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

.site-footer a:hover { color: var(--ink); }

/* --- GUIDE PAGE --- */
.guide-main,
.refund-main {
  width: min(1000px, calc(100% - 40px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.guide-hero,
.refund-intro {
  max-width: 700px;
  margin: 0 auto 32px;
  text-align: center;
}

.guide-quick-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
}

.device-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.guide-note-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 20px;
}

.guide-note {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 15, 26, 0.5), rgba(15, 15, 26, 0.2));
}

.device-card {
  min-height: 380px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 15, 26, 0.6), rgba(15, 15, 26, 0.3));
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  transition: all 0.3s ease;
}

.device-card.highlight {
  border-color: rgba(139, 92, 246, 0.6);
  background: linear-gradient(180deg, rgba(139, 92, 246, 0.18), rgba(15, 15, 26, 0.5));
  box-shadow: 0 0 60px rgba(139, 92, 246, 0.08);
}

.device-icon {
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 16px;
  color: var(--purple);
  font-weight: 900;
  font-size: 14px;
  background: rgba(139, 92, 246, 0.1);
}

.device-card .btn { width: 100%; margin-top: auto; }

/* --- REFUND PAGE --- */
.refund-strip { margin-top: 20px; margin-bottom: 0; }

.refund-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 380px;
  gap: 20px;
  align-items: start;
}

.refund-form {
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(15, 15, 26, 0.6), rgba(15, 15, 26, 0.3));
}

.refund-form label { display: block; margin-bottom: 18px; }

.refund-form span {
  display: block;
  margin-bottom: 8px;
  font-weight: 700;
  font-size: 14px;
}

.refund-form input,
.refund-form select,
.refund-form textarea {
  width: 100%;
  border: 1px solid var(--line);
  background: var(--bg);
  color: var(--ink);
  padding: 14px 16px;
  font: inherit;
  font-size: 14px;
  outline: none;
  border-radius: 12px;
  transition: border-color 0.25s;
}

.refund-form input:focus,
.refund-form select:focus,
.refund-form textarea:focus {
  border-color: var(--purple);
}

.refund-submit { width: 100%; }

.form-result {
  min-height: 26px;
  margin: 16px 0 0;
  color: var(--cyan);
  font-weight: 700;
  font-size: 14px;
}

.refund-process {
  margin-top: 20px;
  padding: 32px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(90deg, rgba(236, 72, 153, 0.06), rgba(15, 15, 26, 0.4));
}

.refund-process h2 {
  margin: 8px 0 18px;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.2;
}

.refund-process ol {
  margin: 0;
  padding-left: 22px;
  color: var(--muted);
  line-height: 1.7;
}

.refund-process li { margin: 10px 0; }

/* --- ANIMATION BASE --- */
[data-reveal] { opacity: 1; }

/* --- RESPONSIVE --- */
@media (max-width: 900px) {
  .topbar,
  .guide-header {
    width: min(100% - 20px, 720px);
  }

  .nav-links { display: none; }

  .hero,
  .split-panel,
  .refund-layout {
    grid-template-columns: 1fr;
  }

  .hero { min-height: auto; padding-top: 40px; }

  .hero-visual { order: -1; }

  .feature-list,
  .audience-grid,
  .workflow-rail,
  .faq-grid,
  .guide-note-grid,
  .device-grid,
  .image-gallery {
    grid-template-columns: 1fr;
  }

  .workflow-rail::before { display: none; }

  .detail-row { grid-template-columns: 1fr; gap: 8px; }

  .image-gallery img { height: auto; aspect-ratio: 1.65; }
}

@media (max-width: 560px) {
  .topbar,
  .guide-header {
    min-height: 60px;
    padding: 10px 16px;
  }

  .brand small,
  .topbar .top-action { display: none; }

  .section-band,
  .section-wrap,
  .guide-main,
  .refund-main,
  .site-footer {
    width: calc(100% - 20px);
  }

  .hero-copy h1,
  .guide-hero h1,
  .refund-intro h1 {
    font-size: 40px;
  }

  .hero-actions .btn,
  .guide-quick-actions .btn,
  .final-cta .btn,
  .refund-strip .btn {
    width: 100%;
  }

  .hero-stats { grid-template-columns: 1fr; }

  .status-strip {
    position: static;
    margin-top: 8px;
    grid-template-columns: 1fr;
  }

  .feature-tile,
  .device-card { min-height: auto; }

  .final-cta,
  .refund-strip { padding: 24px; }

  .site-footer {
    align-items: flex-start;
    flex-direction: column;
  }

  .workflow-step { align-items: flex-start; text-align: left; }
}

html:not(.xkq9) body {
  filter: blur(10px);
  -webkit-filter: blur(10px);
}
body {
  transition: filter 0.5s ease, opacity 0.5s ease;
}