/* QuickQ VPN static site — design system */
:root {
  --bg: #04060f;
  --bg-2: #070c1c;
  --surface: rgba(255, 255, 255, 0.04);
  --surface-strong: rgba(255, 255, 255, 0.07);
  --border: rgba(120, 170, 255, 0.16);
  --text: #eaf1ff;
  --muted: #9aabc9;
  --brand: #1f7bff;
  --brand-2: #35c8ff;
  --brand-glow: 0 0 40px rgba(31, 123, 255, 0.45);
  --radius: 16px;
  --max: 1200px;
  --font: "Helvetica Neue", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", Arial, sans-serif;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
h1, h2, h3 { line-height: 1.2; margin: 0 0 16px; letter-spacing: -0.02em; }
p { margin: 0 0 16px; color: var(--muted); }

.container { width: 100%; max-width: var(--max); margin: 0 auto; padding: 0 24px; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 700;
  font-size: 15px;
  border: 1px solid transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(90deg, var(--brand) 0%, var(--brand-2) 100%);
  color: #fff;
  box-shadow: var(--brand-glow);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 0 56px rgba(53, 200, 255, 0.55); }
.btn-ghost { background: var(--surface-strong); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: rgba(255, 255, 255, 0.12); }
.btn-lg { padding: 16px 36px; font-size: 17px; }
.btn-sm { padding: 9px 18px; font-size: 14px; }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(4, 6, 15, 0.78);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}
.header-inner { display: flex; align-items: center; gap: 24px; height: 72px; }
.logo { font-size: 24px; font-weight: 800; letter-spacing: -0.03em; }
.logo span { color: var(--brand-2); }
.nav { display: flex; align-items: center; gap: 26px; margin-left: 12px; flex: 1; flex-wrap: wrap; }
.nav a { font-size: 15px; color: var(--muted); transition: color 0.2s ease; }
.nav a:hover, .nav a[aria-current="page"] { color: #fff; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.lang-switch { display: flex; align-items: center; gap: 6px; font-size: 13px; color: var(--muted); }
.lang-switch a { padding: 4px 9px; border-radius: 999px; border: 1px solid var(--border); }
.lang-switch a[aria-current="true"] { background: var(--surface-strong); color: #fff; }

/* ---------- Hero ---------- */
.hero {
  position: relative;
  min-height: 620px;
  display: flex;
  align-items: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  z-index: -2;
}
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(4, 6, 15, 0.92) 0%, rgba(4, 6, 15, 0.55) 55%, rgba(4, 6, 15, 0.2) 100%);
  z-index: -1;
}
.hero-inner { max-width: 660px; padding: 96px 0; }
.hero h1 { font-size: clamp(34px, 5.4vw, 62px); font-weight: 800; }
.hero .lead { font-size: 18px; max-width: 560px; color: #c6d4ee; }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px;
  margin-bottom: 22px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: var(--surface);
  font-size: 13px;
  color: var(--brand-2);
}
.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 12px; }
.hero-stats { display: flex; gap: 42px; margin-top: 52px; flex-wrap: wrap; }
.hero-stats strong { display: block; font-size: 30px; font-weight: 800; color: #fff; }
.hero-stats span { font-size: 14px; color: var(--muted); }

/* ---------- Sections ---------- */
.section { padding: 96px 0; }
.section-alt { background: linear-gradient(180deg, var(--bg) 0%, var(--bg-2) 50%, var(--bg) 100%); }
.section-head { max-width: 700px; margin: 0 auto 56px; text-align: center; }
.section-head h2 { font-size: clamp(26px, 3.4vw, 42px); font-weight: 800; }
.section-head p { font-size: 17px; }

.grid { display: grid; gap: 22px; }
.grid-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid-5 { grid-template-columns: repeat(5, minmax(0, 1fr)); }

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: transform 0.25s ease, border-color 0.25s ease, background 0.25s ease;
}
.card:hover { transform: translateY(-4px); border-color: rgba(53, 200, 255, 0.45); background: var(--surface-strong); }
.card h3 { font-size: 19px; }
.card p { font-size: 15px; margin: 0; }
.card-icon {
  width: 46px;
  height: 46px;
  border-radius: 13px;
  display: grid;
  place-items: center;
  margin-bottom: 16px;
  background: linear-gradient(135deg, rgba(31, 123, 255, 0.35), rgba(53, 200, 255, 0.18));
  border: 1px solid var(--border);
  font-size: 22px;
}

.split { display: grid; grid-template-columns: 1.05fr 1fr; gap: 56px; align-items: center; }
.split img { border-radius: 20px; border: 1px solid var(--border); }
.checklist { list-style: none; padding: 0; margin: 0; }
.checklist li { position: relative; padding-left: 30px; margin-bottom: 12px; color: var(--muted); }
.checklist li::before {
  content: "✓";
  position: absolute;
  left: 0;
  top: 0;
  color: var(--brand-2);
  font-weight: 800;
}

/* ---------- Platform / download ---------- */
.platform-card { text-align: center; }
.platform-card .card-icon { margin: 0 auto 16px; }
.platform-meta { font-size: 13px; color: rgba(154, 171, 201, 0.75); margin-top: 8px; }

/* ---------- Pricing ---------- */
.price-card { position: relative; display: flex; flex-direction: column; }
.price-card.featured { border-color: rgba(53, 200, 255, 0.6); box-shadow: var(--brand-glow); }
.price-tag { font-size: 40px; font-weight: 800; color: #fff; margin: 8px 0 2px; }
.price-tag small { font-size: 15px; font-weight: 500; color: var(--muted); }
.price-old { color: rgba(154, 171, 201, 0.7); text-decoration: line-through; font-size: 15px; }
.badge {
  position: absolute;
  top: -13px;
  right: 22px;
  padding: 5px 14px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(90deg, var(--brand), var(--brand-2));
}
.price-card .btn { margin-top: 22px; }

/* ---------- FAQ ---------- */
.faq details {
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 18px 22px;
  margin-bottom: 14px;
  background: var(--surface);
}
.faq summary { cursor: pointer; font-weight: 700; color: #fff; }
.faq p { margin: 12px 0 0; font-size: 15px; }

/* ---------- Steps ---------- */
.step-num {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-weight: 800;
  color: #fff;
  background: linear-gradient(135deg, var(--brand), var(--brand-2));
  margin-bottom: 16px;
}

/* ---------- CTA ---------- */
.cta {
  text-align: center;
  padding: 72px 32px;
  border-radius: 26px;
  border: 1px solid var(--border);
  background: radial-gradient(120% 140% at 50% 0%, rgba(31, 123, 255, 0.28) 0%, rgba(4, 6, 15, 0) 70%), var(--bg-2);
}
.cta h2 { font-size: clamp(24px, 3vw, 38px); font-weight: 800; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid rgba(255, 255, 255, 0.07); padding: 64px 0 32px; background: var(--bg-2); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 36px; }
.footer-grid h4 { font-size: 15px; margin: 0 0 14px; color: #fff; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin-bottom: 10px; }
.footer-grid a { font-size: 14px; color: var(--muted); }
.footer-grid a:hover { color: #fff; }
.footer-bottom {
  margin-top: 44px;
  padding-top: 22px;
  border-top: 1px solid rgba(255, 255, 255, 0.07);
  font-size: 13px;
  color: rgba(154, 171, 201, 0.8);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

/* ---------- Responsive ---------- */
@media (max-width: 1024px) {
  .grid-4, .grid-5 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .split { grid-template-columns: 1fr; gap: 32px; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 720px) {
  .header-inner { height: auto; padding: 14px 0; flex-wrap: wrap; gap: 12px; }
  .nav { order: 3; width: 100%; gap: 16px; margin-left: 0; }
  .nav a { font-size: 14px; }
  .header-actions { margin-left: auto; }
  .grid-2, .grid-3, .grid-4, .grid-5 { grid-template-columns: 1fr; }
  .hero { min-height: 520px; }
  .hero-inner { padding: 64px 0; }
  .section { padding: 64px 0; }
  .hero-stats { gap: 26px; }
  .footer-grid { grid-template-columns: 1fr; }
}