:root {
  --bg-primary:        #0d0d1a;
  --bg-secondary:      #12122b;
  --bg-card:           #16213e;
  --bg-card-hover:     #0f3460;
  --accent-purple:     #7c3aed;
  --accent-purple-lt:  #a78bfa;
  --accent-cyan:       #06b6d4;
  --accent-gold:       #f59e0b;
  --accent-green:      #10b981;
  --text-primary:      #e2e8f0;
  --text-secondary:    #94a3b8;
  --text-muted:        #64748b;
  --border:            rgba(124, 58, 237, 0.28);
  --glow-purple:       0 0 22px rgba(124, 58, 237, 0.45);
  --glow-cyan:         0 0 22px rgba(6, 182, 212, 0.45);
  --gradient-hero:     linear-gradient(135deg, #0d0d1a 0%, #1a0a2e 55%, #0a1a2e 100%);
  --gradient-card:     linear-gradient(145deg, #16213e, #0f3460);
}

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

body {
  background: var(--bg-primary);
  color: var(--text-primary);
  font-family: 'Exo 2', sans-serif;
  line-height: 1.7;
  overflow-x: hidden;
}

::selection { background: rgba(124, 58, 237, 0.35); color: #fff; }

::-webkit-scrollbar          { width: 6px; }
::-webkit-scrollbar-track    { background: var(--bg-secondary); }
::-webkit-scrollbar-thumb    { background: var(--accent-purple); border-radius: 3px; }

a { color: var(--accent-purple-lt); }
a:hover { color: var(--accent-cyan); }

.navbar {
  background: rgba(13, 13, 26, 0.96) !important;
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  transition: padding .3s;
}
.navbar-brand {
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-primary) !important;
  letter-spacing: -0.3px;
}
.navbar-brand span { color: var(--accent-purple-lt); }
.navbar-toggler { border-color: var(--border); }
.navbar-toggler-icon { filter: invert(1); }

.nav-link {
  color: var(--text-secondary) !important;
  font-weight: 500;
  padding: .5rem .9rem !important;
  transition: color .2s;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 2px; left: .9rem; right: .9rem;
  height: 2px;
  background: var(--accent-purple-lt);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform .25s;
}
.nav-link:hover, .nav-link.active-link { color: var(--accent-purple-lt) !important; }
.nav-link:hover::after, .nav-link.active-link::after { transform: scaleX(1); }

.lang-switcher .btn-outline-secondary {
  border-color: var(--border);
  color: var(--text-secondary);
  font-size: .82rem;
}
.lang-switcher .btn-outline-secondary:hover {
  background: rgba(124, 58, 237, .15);
  border-color: var(--accent-purple);
  color: var(--accent-purple-lt);
}
.lang-switcher .dropdown-menu {
  background: #1a1a2e;
  border: 1px solid var(--border);
  min-width: 140px;
  padding: 6px;
}
.lang-switcher .dropdown-item {
  color: var(--text-secondary);
  border-radius: 6px;
  padding: 6px 12px;
  font-size: .88rem;
}
.lang-switcher .dropdown-item:hover  { background: rgba(124,58,237,.18); color: var(--text-primary); }
.lang-switcher .dropdown-item.lang-active { background: var(--accent-purple); color: #fff; }

.btn-nav-dl {
  background: linear-gradient(135deg, var(--accent-purple), #5b21b6);
  color: #fff !important;
  border-radius: 50px;
  padding: 7px 22px;
  font-weight: 700;
  font-size: .88rem;
  text-decoration: none;
  transition: all .3s;
  box-shadow: var(--glow-purple);
  white-space: nowrap;
}
.btn-nav-dl:hover { transform: translateY(-2px); box-shadow: 0 0 28px rgba(124,58,237,.65); color: #fff !important; }

.hero-section {
  min-height: 92vh;
  background: var(--gradient-hero);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  padding-top: 80px;
}
.hero-section::before {
  content: '';
  position: absolute;
  width: 580px; height: 580px;
  background: radial-gradient(circle, rgba(124,58,237,.14) 0%, transparent 70%);
  top: -120px; right: -80px;
  border-radius: 50%;
  pointer-events: none;
}
.hero-section::after {
  content: '';
  position: absolute;
  width: 380px; height: 380px;
  background: radial-gradient(circle, rgba(6,182,212,.09) 0%, transparent 70%);
  bottom: -40px; left: -60px;
  border-radius: 50%;
  pointer-events: none;
}
.hero-title {
  font-size: 3.4rem;
  font-weight: 800;
  line-height: 1.15;
  margin-bottom: 20px;
}
.hero-title .hi {
  background: linear-gradient(90deg, var(--accent-purple-lt), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.hero-subtitle { color: var(--text-secondary); font-size: 1.05rem; max-width: 520px; margin-bottom: 32px; }
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.app-icon {
  border-radius: 22px;
  box-shadow: var(--glow-purple), 0 24px 64px rgba(0,0,0,.55);
  border: 2px solid var(--border);
}
.hero-meta { color: var(--text-muted); font-size: .82rem; margin-top: 16px; }
.hero-meta span { margin-right: 16px; }

.btn-dl {
  background: linear-gradient(135deg, var(--accent-purple), #5b21b6);
  color: #fff;
  border: none;
  padding: 13px 30px;
  font-size: 1rem;
  font-weight: 700;
  border-radius: 50px;
  box-shadow: var(--glow-purple);
  transition: all .3s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  animation: pulseGlow 2.5s infinite;
}
.btn-dl:hover { transform: translateY(-3px); color: #fff; animation: none; box-shadow: 0 0 36px rgba(124,58,237,.7); }

@keyframes pulseGlow {
  0%,100% { box-shadow: 0 0 20px rgba(124,58,237,.4); }
  50%      { box-shadow: 0 0 40px rgba(124,58,237,.8), 0 0 60px rgba(124,58,237,.25); }
}

.btn-outline-cyan {
  border: 2px solid var(--accent-cyan);
  color: var(--accent-cyan);
  background: transparent;
  padding: 11px 26px;
  font-size: 1rem;
  font-weight: 600;
  border-radius: 50px;
  transition: all .3s;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.btn-outline-cyan:hover { background: var(--accent-cyan); color: var(--bg-primary); box-shadow: var(--glow-cyan); transform: translateY(-3px); }

.stats-bar {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 22px 0;
}
.stat-num   { font-size: 1.75rem; font-weight: 800; color: var(--accent-purple-lt); }
.stat-label { color: var(--text-muted); font-size: .78rem; text-transform: uppercase; letter-spacing: .6px; }

.section-dark   { background: var(--bg-primary);   padding: 80px 0; }
.section-darker { background: var(--bg-secondary); padding: 80px 0; }

.section-title {
  font-size: 2.1rem;
  font-weight: 800;
  margin-bottom: 10px;
}
.section-title span { color: var(--accent-purple-lt); }
.section-sub { color: var(--text-secondary); max-width: 580px; margin: 0 auto 50px; }

.feature-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px 24px;
  height: 100%;
  transition: all .3s;
}
.feature-card:hover { transform: translateY(-6px); border-color: var(--accent-purple); box-shadow: var(--glow-purple); }
.f-icon {
  width: 52px; height: 52px;
  background: rgba(124,58,237,.14);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem;
  margin-bottom: 18px;
}
.f-icon-img-wrap {
  width: 70px;
  height: 70px;
  border-radius: 10px;
  overflow: hidden;
}
.feature-icon-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.f-title { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.f-desc  { color: var(--text-secondary); font-size: .88rem; line-height: 1.75; }

/* 合并后的 .ss-img —— 整合了所有属性，无重复 */
.ss-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 9 / 19;
  object-fit: cover;
  object-position: center top;
  border-radius: 16px;
  border: 2px solid var(--border);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
  transition: border-color 0.3s, box-shadow 0.3s, transform 0.3s;
}
.ss-img:hover {
  border-color: var(--accent-purple);
  box-shadow: var(--glow-purple);
  transform: scale(1.03);
}

/* 完整且唯一的 .feature-ss-img 定义 */
.feature-ss-img {
  aspect-ratio: 9 / 19;
  object-fit: cover;
  object-position: center top;
  display: block;
  width: 100%;
  height: auto;
}

/* Hero 内三张手机截图宽度限制 */
.hero-section .ss-img {
  max-width: min(100%, 200px);
  margin-left: auto;
  margin-right: auto;
}

/* 截图网格内稍宽一些 */
.section-darker .ss-img,
.section-dark .ss-img {
  max-width: 100%;
  aspect-ratio: 9 / 19;
}

.dl-box {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 44px 40px;
  text-align: center;
  box-shadow: var(--glow-purple);
  position: relative;
  overflow: hidden;
}
.dl-box::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at top center, rgba(124,58,237,.08), transparent 65%);
  pointer-events: none;
}
.ver-badge {
  background: rgba(124,58,237,.2);
  border: 1px solid var(--accent-purple);
  color: var(--accent-purple-lt);
  border-radius: 50px;
  padding: 4px 16px;
  font-size: .83rem;
  font-weight: 600;
  display: inline-block;
  margin-bottom: 14px;
}
.dl-meta { color: var(--text-muted); font-size: .85rem; margin-top: 16px; }
.dl-meta span { margin: 0 10px; }

.safe-badge {
  background: rgba(16,185,129,.12);
  border: 1px solid rgba(16,185,129,.4);
  border-radius: 10px;
  padding: 10px 18px;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent-green);
  font-weight: 600;
  font-size: .9rem;
}

.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 22px 24px;
  display: flex;
  gap: 18px;
  align-items: flex-start;
  transition: all .3s;
  margin-bottom: 16px;
}
.step-card:hover { border-color: var(--accent-purple); box-shadow: var(--glow-purple); }
.step-num {
  width: 42px; height: 42px;
  min-width: 42px;
  background: linear-gradient(135deg, var(--accent-purple), #5b21b6);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800;
  font-size: 1rem;
  box-shadow: var(--glow-purple);
}
.step-title { font-size: 1rem; font-weight: 700; margin-bottom: 4px; }
.step-desc  { color: var(--text-secondary); font-size: .88rem; margin: 0; }

.step-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
}

.accordion-item {
  background: var(--bg-card) !important;
  border: 1px solid var(--border) !important;
  margin-bottom: 10px;
  border-radius: 12px !important;
  overflow: hidden;
}
.accordion-button {
  background: var(--bg-card) !important;
  color: var(--text-primary) !important;
  font-weight: 600;
  box-shadow: none !important;
  font-size: .95rem;
}
.accordion-button:not(.collapsed) {
  background: rgba(124,58,237,.1) !important;
  color: var(--accent-purple-lt) !important;
}
.accordion-button::after { filter: invert(1) brightness(0.7); }
.accordion-body {
  background: var(--bg-card) !important;
  color: var(--text-secondary);
  border-top: 1px solid var(--border);
  font-size: .9rem;
  line-height: 1.8;
}

.blog-card {
  background: var(--gradient-card);
  border: 1px solid var(--border);
  border-radius: 16px;
  overflow: hidden;
  height: 100%;
  transition: all .3s;
}
.blog-card:hover { border-color: var(--accent-purple); transform: translateY(-5px); box-shadow: var(--glow-purple); }
.blog-card-img { width: 100%; height: 190px; object-fit: cover; }
.blog-card-body { padding: 22px; }
.blog-tag {
  background: rgba(124,58,237,.18);
  color: var(--accent-purple-lt);
  border-radius: 50px;
  padding: 2px 12px;
  font-size: .75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .5px;
}
.blog-date  { color: var(--text-muted); font-size: .82rem; margin-top: 6px; }
.blog-title { font-size: 1.05rem; font-weight: 700; margin: 10px 0 8px; color: var(--text-primary); text-decoration: none; display: block; }
.blog-title:hover { color: var(--accent-purple-lt); }
.blog-exc   { color: var(--text-secondary); font-size: .88rem; line-height: 1.75; }
.read-more  { color: var(--accent-cyan); font-weight: 600; font-size: .88rem; text-decoration: none; }
.read-more:hover { color: var(--accent-purple-lt); }

.tldr-box {
  background: rgba(124,58,237,.07);
  border-left: 4px solid var(--accent-purple);
  border-radius: 0 12px 12px 0;
  padding: 18px 22px;
  margin-bottom: 30px;
}
.tldr-label { color: var(--accent-purple-lt); font-weight: 700; font-size: .82rem; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 6px; }
.tldr-text  { color: var(--text-secondary); font-size: .93rem; line-height: 1.75; margin: 0; }

.risk-banner-wrap {
  background: var(--bg-secondary);
  padding: 96px 0 8px;
}
.risk-banner {
  background: rgba(248, 113, 113, 0.1);
  border: 1px solid rgba(248, 113, 113, 0.45);
  border-left: 4px solid #ef4444;
  border-radius: 12px;
  padding: 14px 18px;
  color: #fecaca;
  font-size: 1.05rem;
  line-height: 1.65;
}
.risk-banner strong {
  color: #fecaca;
  font-weight: 800;
}

.page-hero {
  background: var(--gradient-hero);
  padding: 110px 0 64px;
  border-bottom: 1px solid var(--border);
}
.page-hero h1 { font-size: 2.4rem; font-weight: 800; }
.page-hero p  { color: var(--text-secondary); max-width: 550px; }

.breadcrumb-item a { color: var(--accent-purple-lt); text-decoration: none; }
.breadcrumb-item a:hover { color: var(--accent-cyan); }
.breadcrumb-item + .breadcrumb-item::before { color: var(--text-muted); }
.breadcrumb-item.active { color: var(--text-muted); }

.policy-content h2 { font-size: 1.35rem; font-weight: 700; color: var(--accent-purple-lt); margin: 36px 0 12px; }
.policy-content p, .policy-content li { color: var(--text-secondary); line-height: 1.85; font-size: .93rem; }
.policy-content ul { padding-left: 20px; }

.page-404 { min-height: 80vh; display: flex; align-items: center; justify-content: center; text-align: center; }
.num-404 {
  font-size: 7.5rem;
  font-weight: 900;
  line-height: 1;
  background: linear-gradient(90deg, var(--accent-purple-lt), var(--accent-cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
}
.footer-brand { font-size: 1.2rem; font-weight: 800; color: var(--text-primary); }
.footer-brand span { color: var(--accent-purple-lt); }
.footer-desc { color: var(--text-muted); font-size: .87rem; margin-top: 8px; max-width: 240px; line-height: 1.65; }
.footer-heading { color: var(--text-primary); font-weight: 700; margin-bottom: 14px; font-size: .88rem; text-transform: uppercase; letter-spacing: .6px; }
.footer-link { color: var(--text-muted); text-decoration: none; font-size: .88rem; display: block; margin-bottom: 8px; transition: color .2s; }
.footer-link:hover { color: var(--accent-purple-lt); }
.footer-bottom { border-top: 1px solid var(--border); margin-top: 40px; padding-top: 22px; color: var(--text-muted); font-size: .82rem; }
.disclaimer {
  background: rgba(245,158,11,.08);
  border: 1px solid rgba(245,158,11,.25);
  border-radius: 8px;
  padding: 10px 14px;
  color: #fbbf24;
  font-size: .79rem;
  line-height: 1.6;
}

.scroll-top {
  position: fixed; bottom: 24px; right: 24px;
  width: 42px; height: 42px;
  background: var(--accent-purple);
  border: none; border-radius: 50%;
  color: #fff; font-size: 1rem;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer;
  box-shadow: var(--glow-purple);
  transition: all .3s;
  z-index: 999;
  text-decoration: none;
}
.scroll-top:hover { transform: translateY(-4px); color: #fff; }

.divider-line { border-color: var(--border); opacity: 1; }
.text-purple   { color: var(--accent-purple-lt) !important; }
.text-cyan     { color: var(--accent-cyan) !important; }
.text-gold     { color: var(--accent-gold) !important; }
.text-sec      { color: var(--text-secondary) !important; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to   { opacity: 1; transform: translateY(0); }
}
.fade-up { animation: fadeUp .65s ease both; }
.delay-1 { animation-delay: .1s; }
.delay-2 { animation-delay: .22s; }
.delay-3 { animation-delay: .36s; }
.delay-4 { animation-delay: .5s; }

@media (max-width: 991px) {
  .navbar-collapse { padding: 16px 0; }
  .btn-nav-dl { margin-top: 10px; display: inline-block; }
  .lang-switcher { margin-bottom: 6px; }
}
@media (max-width: 767px) {
  .hero-title   { font-size: 2.1rem; }
  .section-dark, .section-darker { padding: 56px 0; }
  .page-hero    { padding: 90px 0 44px; }
  .page-hero h1 { font-size: 1.9rem; }
  .dl-box       { padding: 28px 18px; }
  .risk-banner-wrap { padding: 82px 0 6px; }
  .risk-banner { font-size: .92rem; padding: 12px 14px; }
  .section-title { font-size: 1.75rem; }
}
@media (max-width: 575px) {
  .hero-section .ss-img {
    max-width: min(100%, 140px);
  }
}