/* Edge-X Mirror Site — style.css */
@import url('https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.5.0/css/all.min.css');

:root {
  /* Edge-X design tokens (DESIGN.md + live site verification) */
  /* Background: two-layer dark */
  --bg:           #000000;   /* page body — rgb(0,0,0) confirmed from live site */
  --surface:      #141414;   /* card / panel surface — rgb(20,20,20), 6 occurrences */
  --surface-2:    #1f1f1f;   /* overlay / modal layer — rgba(31,31,31) confirmed */
  --header-bg:    #000000;
  /* Primary accent: teal */
  --primary:      #219f88;
  --primary-dark: #1a8570;
  /* Secondary accents */
  --blue:         #0083e0;
  --green:        #00a76f;
  --purple:       #4c43cb;
  /* Text */
  --text:         #ffffff;
  --text-muted:   #858585;
  /* Borders */
  --border:       #424242;
  --border-dark:  #141414;
  /* Typography scale (DESIGN.md) */
  --font-body:    "PingFang SC -apple-system", BlinkMacSystemFont, "PingFang SC",
                  "Hiragino Sans GB", "Microsoft YaHei", "微软雅黑",
                  "Helvetica Neue", Helvetica, Ubuntu, Roboto, Noto,
                  "Segoe UI", Arial, sans-serif;
  --font-small:   "Noto Sans", "Helvetica Neue", Helvetica, Arial, sans-serif;
  /* Radius tokens (DESIGN.md) */
  --radius-sm:    6px;
  --radius-md:    8px;
  --radius-lg:    12px;
  --radius-xl:    9999px;
  /* Spacing tokens (DESIGN.md) */
  --space-2:      2px;
  --space-3:      4px;
  --space-xs:     8px;
  --space-7:      12px;
  --space-8:      15px;
  --space-sm:     16px;
  --space-md:     24px;
  --space-lg:     32px;
  --space-xl:     64px;
  /* Elevation: flat per DESIGN.md (no validated shadow payload) */
  --shadow-card:  none;
  --shadow-lg:    0 8px 32px rgba(0,0,0,.4);
  --transition:   0.2s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html, body { margin: 0; padding: 0; overflow-x: hidden; max-width: 100%; }
body {
  font-family: var(--font-body);
  font-size: 14px; line-height: 22px;
  color: var(--text); background: var(--bg);
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--primary); text-decoration: none; }
a:hover { text-decoration: underline; }
ul { list-style: none; padding: 0; margin: 0; }
h1, h2, h3, h4 { margin-top: 0; line-height: 1.25; color: var(--text); }

/* ─── HEADER ─── */
.site-header {
  position: sticky; top: 0; z-index: 1000;
  background: var(--header-bg);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(12px);
}
.nav {
  max-width: 1200px; margin: 0 auto;
  display: flex; align-items: center;
  padding: 0 var(--space-sm);
  height: 64px; gap: var(--space-sm);
}
.brand { display: flex; align-items: center; flex-shrink: 0; }
.logo { height: 32px; width: auto; max-width: 180px; object-fit: contain; }

.nav-links {
  display: flex; align-items: center; gap: 4px;
  flex: 1; justify-content: center;
}
.nav-links > li > a {
  color: rgba(255,255,255,.8); font-size: 14px; font-weight: 500;
  padding: 8px 12px; border-radius: var(--radius-sm);
  transition: color var(--transition), background var(--transition);
  white-space: nowrap;
}
.nav-links > li > a:hover { color: #fff; background: rgba(255,255,255,.08); text-decoration: none; }

.nav-right {
  display: flex; align-items: center; gap: var(--space-sm);
  flex-shrink: 0; margin-left: auto;
}

/* mobile-only language row inside the menu; hidden on desktop */
.mobile-lang { display: none; }

/* ─── DROPDOWN / LANGUAGE SWITCHER ─── */
.dropdown { position: relative; }
.dropdown-panel {
  position: absolute; top: 100%; right: 0;
  margin-top: 0; padding-top: 8px;
  display: none; min-width: 140px; z-index: 1000;
}
.dropdown-panel-inner {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.dropdown:hover .dropdown-panel,
.dropdown:focus-within .dropdown-panel { display: block; }
.dropdown.open .dropdown-panel { display: block; }
.dropdown-panel a {
  display: block; padding: 10px 16px;
  color: var(--text); font-size: 14px;
  transition: background var(--transition);
  white-space: nowrap;
}
.dropdown-panel a:hover { background: var(--surface-2); color: var(--primary); text-decoration: none; }

.lang-btn {
  background: none; border: 1px solid var(--border);
  color: rgba(255,255,255,.8); padding: 7px 12px;
  border-radius: var(--radius-xl); cursor: pointer;
  font-size: 14px; display: flex; align-items: center; gap: 6px;
  transition: border-color var(--transition), color var(--transition);
}
.lang-btn:hover { border-color: var(--primary); color: var(--primary); }

/* ─── CTA BUTTONS ─── */
.btn-cta {
  background: var(--primary); color: #fff;
  padding: 10px 20px; border-radius: var(--radius-xl);
  font-size: 14px; font-weight: 700;
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap; display: inline-block;
}
.btn-cta:hover { opacity: .88; text-decoration: none; transform: translateY(-1px); }

.btn-cta-lg {
  background: var(--primary); color: #fff;
  padding: 14px 32px; border-radius: var(--radius-xl);
  font-size: 16px; font-weight: 700;
  transition: opacity var(--transition), transform var(--transition);
  white-space: nowrap; display: inline-block;
}
.btn-cta-lg:hover { opacity: .88; text-decoration: none; transform: translateY(-1px); }

.btn-outline {
  background: transparent; color: #fff;
  padding: 13px 28px; border-radius: var(--radius-xl);
  border: 1px solid rgba(255,255,255,.35);
  font-size: 16px; font-weight: 600;
  transition: border-color var(--transition), background var(--transition);
  white-space: nowrap; display: inline-block;
}
.btn-outline:hover { border-color: #fff; background: rgba(255,255,255,.08); text-decoration: none; }

.btn-support {
  display: inline-block; padding: 10px 22px;
  background: transparent; border: 1px solid var(--primary);
  color: var(--primary); border-radius: var(--radius-xl);
  font-size: 14px; font-weight: 600;
  transition: background var(--transition), color var(--transition);
}
.btn-support:hover { background: var(--primary); color: #fff; text-decoration: none; }

/* ─── MOBILE NAV ─── */
.nav-toggle {
  display: none; background: none; border: none;
  color: var(--text); font-size: 22px; cursor: pointer;
  padding: 8px; margin-left: auto; line-height: 1;
}

/* ─── HERO ─── */
.hero {
  background: var(--bg);
  padding: 80px var(--space-sm) 64px;
  text-align: center;
  position: relative; overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(ellipse 70% 60% at 50% 0%, rgba(33,159,136,.18) 0%, transparent 70%);
  pointer-events: none;
}
.hero-inner { max-width: 760px; margin: 0 auto; position: relative; z-index: 1; }
.hero h1 {
  font-size: 42px; line-height: 1.15; font-weight: 700;
  color: var(--text); margin-bottom: 20px;
}
.hero p { font-size: 17px; line-height: 1.7; color: var(--text-muted); margin-bottom: 32px; }
.hero-cta { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 20px; }
.hero-note { font-size: 13px; color: var(--text-muted); margin-top: 0; }
.hero-screenshot-wrap {
  margin: 48px auto 0; max-width: 900px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
}
.hero-screenshot { width: 100%; }

.badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(33,159,136,.15); border: 1px solid rgba(33,159,136,.4);
  color: var(--primary); padding: 6px 14px;
  border-radius: var(--radius-xl); font-size: 13px; font-weight: 600;
  margin-bottom: 24px;
}

/* ─── TRUST BAR ─── */
.trust-bar {
  background: var(--surface);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 20px var(--space-sm);
}
.trust-bar-inner {
  max-width: 900px; margin: 0 auto;
  display: flex; align-items: center; justify-content: center;
  gap: 0; flex-wrap: wrap;
}
.trust-item {
  display: flex; flex-direction: column; align-items: center;
  padding: 8px 28px; gap: 4px;
}
.trust-num { font-size: 24px; font-weight: 700; color: var(--primary); line-height: 1.2; }
.trust-label { font-size: 12px; color: var(--text-muted); font-family: var(--font-small); }
.trust-divider { width: 1px; height: 36px; background: var(--border); }

/* ─── LAYOUT HELPERS ─── */
.container { max-width: 1200px; margin: 0 auto; padding: 0 var(--space-sm); }
.section { padding: 72px var(--space-sm); }
.section-alt { background: var(--surface); }
.text-center { text-align: center; }

.section-label {
  display: inline-block;
  color: var(--primary); font-size: 13px; font-weight: 700;
  letter-spacing: .06em; text-transform: uppercase;
  margin-bottom: 12px; font-family: var(--font-small);
}
.section-title { font-size: 32px; font-weight: 700; margin-bottom: 16px; color: var(--text); }
.section-sub { font-size: 16px; color: var(--text-muted); max-width: 620px; margin: 0 auto 40px; }

/* ─── FEATURE GRID ─── */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px; margin-top: 40px;
}
.feature-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 28px 24px;
  transition: border-color var(--transition), transform var(--transition);
}
.feature-card:hover { border-color: var(--primary); transform: translateY(-2px); }
.feature-card i { font-size: 28px; color: var(--primary); margin-bottom: 16px; display: block; }
.feature-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 10px; color: var(--text); }
.feature-card p { font-size: 14px; color: var(--text-muted); line-height: 1.7; margin: 0; }

/* ─── SPLIT ROW ─── */
.split-row {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: 60px; align-items: center;
}
.split-row.reverse { direction: rtl; }
.split-row.reverse > * { direction: ltr; }
.split-image { border-radius: var(--radius-lg); overflow: hidden; border: 1px solid var(--border); }
.split-image img { width: 100%; height: 320px; object-fit: cover; }
.split-content { display: flex; flex-direction: column; gap: 16px; }

/* ─── CHECK LIST ─── */
.check-list { display: flex; flex-direction: column; gap: 10px; margin: 0 0 24px; }
.check-list li {
  font-size: 14px; color: var(--text-muted);
  padding-left: 24px; position: relative;
}
.check-list li::before {
  content: '✓'; position: absolute; left: 0;
  color: var(--primary); font-weight: 700;
}

/* ─── IMAGE STRIP ─── */
.image-strip {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.image-strip-item { border-radius: var(--radius-md); overflow: hidden; border: 1px solid var(--border); }
.image-strip-item img { width: 100%; height: 200px; object-fit: cover; }

/* ─── PLATFORM GRID ─── */
.platform-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 16px;
}
.platform-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-md); padding: 24px 16px;
  display: flex; flex-direction: column; align-items: center; gap: 10px;
  transition: border-color var(--transition);
}
.platform-card:hover { border-color: var(--primary); }
.platform-card i { font-size: 32px; color: var(--primary); }
.platform-card span { font-size: 13px; color: var(--text-muted); font-family: var(--font-small); }

/* ─── FAQ ─── */
.faq-split { display: grid; grid-template-columns: 280px 1fr; gap: 60px; align-items: start; }
.faq-split-heading { font-size: 32px; font-weight: 700; margin-bottom: 12px; }
.faq-split-desc { color: var(--text-muted); font-size: 15px; line-height: 1.7; margin-bottom: 24px; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q {
  width: 100%; background: none; border: none; cursor: pointer;
  padding: 16px 0; text-align: left;
  font-size: 15px; font-weight: 600; color: var(--text);
  font-family: var(--font-body);
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
  transition: color var(--transition);
}
.faq-q:hover { color: var(--primary); }
.faq-a { display: none; padding-bottom: 16px; }
.faq-a p { font-size: 14px; color: var(--text-muted); line-height: 1.8; margin: 0; }
.faq-item.open .faq-a { display: block; }
.faq-item.open .faq-q { color: var(--primary); }
.faq-item.open .faq-q i { transform: rotate(180deg); }
.faq-q i { transition: transform var(--transition); flex-shrink: 0; }

/* standalone full-width faq */
.faq-list { max-width: 800px; margin: 0 auto; }

/* ─── GUARANTEE BANNER ─── */
.guarantee-banner {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 56px 40px;
  text-align: center;
}
.guarantee-banner h2 { font-size: 30px; font-weight: 700; margin-bottom: 16px; }
.guarantee-banner p { font-size: 16px; color: var(--text-muted); max-width: 580px; margin: 0 auto 32px; }

/* ─── PAGE HERO ─── */
.page-hero {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 64px var(--space-sm) 56px;
  text-align: center;
}
.page-hero h1 { font-size: 36px; font-weight: 700; margin-bottom: 16px; }
.page-hero p { font-size: 17px; color: var(--text-muted); max-width: 600px; margin: 0 auto; }

/* ─── PROSE ─── */
.prose { padding: 64px var(--space-sm); }
.prose-inner { max-width: 760px; margin: 0 auto; }
.prose-inner p, .prose-inner li { font-size: 15px; color: var(--text-muted); line-height: 1.8; margin-bottom: 16px; }
.prose-inner h2 { font-size: 22px; font-weight: 700; margin: 40px 0 12px; color: var(--text); }
.prose-inner h3 { font-size: 18px; font-weight: 700; margin: 28px 0 10px; color: var(--text); }
.prose-inner ul { list-style: disc; padding-left: 24px; }

/* ─── PRICING ─── */
.pricing-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.pricing-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 24px;
  display: flex; flex-direction: column; position: relative;
}
.pricing-card.popular { border-color: var(--primary); }
.popular-badge {
  position: absolute; top: -13px; left: 50%; transform: translateX(-50%);
  background: var(--primary); color: #fff;
  padding: 4px 14px; border-radius: var(--radius-xl);
  font-size: 12px; font-weight: 700; font-family: var(--font-small);
  white-space: nowrap;
}
.pricing-name { font-size: 16px; font-weight: 700; margin-bottom: 16px; color: var(--text); }
.pricing-price { font-size: 48px; font-weight: 800; color: var(--text); line-height: 1; }
.pricing-price sup { font-size: 24px; vertical-align: top; margin-top: 8px; }
.pricing-period { font-size: 13px; color: var(--text-muted); margin-top: 8px; margin-bottom: 20px; font-family: var(--font-small); }
.pricing-divider { height: 1px; background: var(--border); margin-bottom: 20px; }
.pricing-features { display: flex; flex-direction: column; gap: 10px; flex: 1; }
.pricing-features li { font-size: 14px; color: var(--text-muted); padding-left: 20px; position: relative; }
.pricing-features li::before { content: '✓'; position: absolute; left: 0; color: var(--primary); font-weight: 700; }
.pricing-cta {
  display: block; text-align: center;
  background: var(--primary); color: #fff;
  padding: 12px 24px; border-radius: var(--radius-xl);
  font-size: 15px; font-weight: 700; margin-top: 24px;
  transition: opacity var(--transition);
}
.pricing-cta:hover { opacity: .88; text-decoration: none; }

/* ─── CONTACT ─── */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; margin-top: 40px; }
.contact-card {
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 32px 28px; text-align: center;
}
.contact-card i { font-size: 36px; color: var(--primary); margin-bottom: 16px; display: block; }
.contact-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 10px; }
.contact-card p { font-size: 14px; color: var(--text-muted); margin-bottom: 20px; }

/* ─── FOOTER ─── */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 56px var(--space-sm) 0;
}
.footer-grid {
  max-width: 1200px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px; padding-bottom: 48px;
}
.footer-brand .logo-footer { height: 28px; margin-bottom: 16px; }
.footer-brand p { font-size: 14px; color: var(--text-muted); line-height: 1.7; max-width: 280px; }
.footer-col h4 { font-size: 13px; font-weight: 700; color: var(--text); margin-bottom: 16px;
  text-transform: uppercase; letter-spacing: .06em; font-family: var(--font-small); }
.footer-col ul li { margin-bottom: 10px; }
.footer-col a { font-size: 14px; color: var(--text-muted); transition: color var(--transition); }
.footer-col a:hover { color: var(--primary); text-decoration: none; }
.footer-bottom {
  max-width: 1200px; margin: 0 auto;
  padding: 20px 0; border-top: 1px solid var(--border);
}
.footer-bottom p { font-size: 13px; color: var(--text-muted); margin: 0; font-family: var(--font-small); }

/* ─── DOWNLOAD CARDS ─── */
.dl-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; margin-top: 40px; }

/* ─── MOBILE ─── */
@media (max-width: 991px) {
  .nav-links { display: none; position: fixed; top: 64px; left: 0; right: 0;
    flex-direction: column; background: var(--bg);
    border-bottom: 1px solid var(--border);
    padding: var(--space-sm) 0; z-index: 999;
    max-height: calc(100vh - 64px); overflow-y: auto;
  }
  .nav-links.open { display: flex; }
  .nav-links > li { width: 100%; }
  .nav-links > li > a { display: block; padding: 12px var(--space-sm); border-radius: 0; }
  .mobile-lang { display: flex; gap: 12px; padding: var(--space-sm) var(--space-sm) 8px; flex-wrap: wrap; justify-content: center; }
  .nav-links > li.mobile-lang > a { display: inline-block; font-size: 14px; line-height: 1.4;
    color: var(--text-muted); padding: 5px 12px; white-space: nowrap;
    border: 1px solid var(--border); border-radius: var(--radius-xl); }
  .nav-links > li.mobile-lang > a.active { color: var(--primary); border-color: var(--primary); }
  .nav { padding: 0; }
  .brand { padding-left: var(--space-sm); }
  .nav-toggle { display: block; padding: 8px var(--space-sm); }
  .nav-right { display: none; }

  .hero h1 { font-size: 28px; }
  .split-row, .split-row.reverse { grid-template-columns: 1fr; direction: ltr; gap: 32px; }
  .faq-split { grid-template-columns: 1fr; gap: 32px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .contact-grid { grid-template-columns: 1fr; }
  .image-strip { grid-template-columns: 1fr; }
  .trust-bar-inner { gap: 0; }
  .trust-item { padding: 8px 16px; }
  .trust-divider { display: none; }
}

@media (max-width: 575px) {
  .hero { padding: 48px var(--space-sm) 40px; }
  .hero h1 { font-size: 24px; }
  .hero-cta { flex-direction: column; align-items: center; }
  .btn-cta-lg, .btn-outline { width: 100%; max-width: 320px; text-align: center; }
  .section { padding: 48px var(--space-sm); }
  .footer-grid { grid-template-columns: 1fr; }
  .guarantee-banner { padding: 40px 24px; }
  .guarantee-banner h2 { font-size: 22px; }
  .pricing-grid { grid-template-columns: 1fr; }
  .section-title { font-size: 24px; }
}