/* ============================================
   KuaiMiao VPN - Global Site Stylesheet
   Naming: kebab-case, block__element--modifier
   ============================================ */

:root {
  --color-primary: #ff6b35;
  --color-primary-dark: #e5522a;
  --color-dark: #1a2233;
  --color-text: #333a45;
  --color-text-light: #6b7280;
  --color-bg: #ffffff;
  --color-bg-soft: #f6f8fb;
  --color-border: #e3e8ef;
  --color-success: #16a34a;
  --radius: 12px;
  --shadow: 0 4px 16px rgba(26, 34, 51, 0.08);
  --max-width: 1120px;
}

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

body {
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
}

img {
  max-width: 100%;
}

a {
  color: var(--color-primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

/* ---------- Header / Navigation ---------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.site-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-dark);
}

.site-logo span {
  color: var(--color-primary);
}

.main-nav ul {
  display: flex;
  gap: 24px;
  list-style: none;
}

.main-nav a {
  color: var(--color-text);
  font-weight: 500;
}

.main-nav a:hover,
.main-nav a.is-active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 26px;
  cursor: pointer;
  color: var(--color-dark);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  transition: background 0.2s ease;
}

.btn--primary {
  background: var(--color-primary);
  color: #fff;
}

.btn--primary:hover {
  background: var(--color-primary-dark);
  text-decoration: none;
}

.btn--outline {
  border: 2px solid var(--color-primary);
  color: var(--color-primary);
}

.btn--outline:hover {
  background: var(--color-primary);
  color: #fff;
  text-decoration: none;
}

/* ---------- Hero ---------- */

.hero {
  background: linear-gradient(135deg, #1a2233 0%, #2b3a5c 100%);
  color: #fff;
  padding: 90px 0;
  text-align: center;
}

.hero__title {
  font-size: 42px;
  line-height: 1.2;
  margin-bottom: 16px;
}

.hero__title span {
  color: var(--color-primary);
}

.hero__subtitle {
  font-size: 18px;
  color: #c7d0e0;
  max-width: 640px;
  margin: 0 auto 32px;
}

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

/* ---------- Sections ---------- */

.section {
  padding: 72px 0;
}

.section--soft {
  background: var(--color-bg-soft);
}

.section__title {
  font-size: 30px;
  color: var(--color-dark);
  text-align: center;
  margin-bottom: 12px;
}

.section__lead {
  text-align: center;
  color: var(--color-text-light);
  max-width: 640px;
  margin: 0 auto 48px;
}

/* ---------- Cards ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
}

.card--soft {
  background: var(--color-bg-soft);
  box-shadow: none;
}

.card__icon {
  font-size: 32px;
  margin-bottom: 12px;
}

.card__title {
  font-size: 18px;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.card__text {
  color: var(--color-text-light);
  font-size: 15px;
}

/* ---------- Steps ---------- */

.step-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}

.step {
  text-align: center;
  padding: 24px;
}

.step__number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 16px;
}

/* ---------- Pricing ---------- */

.plan-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
  align-items: stretch;
}

.plan-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
}

.plan-card--featured {
  border: 2px solid var(--color-primary);
  position: relative;
}

.plan-card__badge {
  position: absolute;
  top: -14px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-primary);
  color: #fff;
  font-size: 13px;
  font-weight: 600;
  padding: 4px 14px;
  border-radius: 20px;
}

.plan-card__name {
  font-size: 20px;
  color: var(--color-dark);
  margin-bottom: 8px;
}

.plan-card__price {
  font-size: 40px;
  font-weight: 700;
  color: var(--color-dark);
  margin-bottom: 4px;
}

.plan-card__price small {
  font-size: 16px;
  font-weight: 400;
  color: var(--color-text-light);
}

.plan-card__billed {
  color: var(--color-text-light);
  font-size: 14px;
  margin-bottom: 24px;
}

.plan-card__features {
  list-style: none;
  text-align: left;
  margin-bottom: 28px;
  flex: 1;
}

.plan-card__features li {
  padding: 8px 0;
  border-bottom: 1px dashed var(--color-border);
  font-size: 15px;
}

.plan-card__features li::before {
  content: "✔";
  color: var(--color-success);
  margin-right: 10px;
}

/* ---------- Download ---------- */

.platform-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 24px;
}

/* ---------- FAQ ---------- */

.faq-group {
  max-width: 800px;
  margin: 0 auto 40px;
}

.faq-group__title {
  font-size: 20px;
  color: var(--color-dark);
  margin-bottom: 16px;
  border-left: 4px solid var(--color-primary);
  padding-left: 12px;
}

.faq-item {
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  margin-bottom: 12px;
  background: var(--color-bg);
}

.faq-item summary {
  padding: 16px 20px;
  font-weight: 600;
  color: var(--color-dark);
  cursor: pointer;
}

.faq-item p {
  padding: 0 20px 16px;
  color: var(--color-text-light);
}

/* ---------- CTA band ---------- */

.cta-band {
  background: linear-gradient(135deg, var(--color-primary) 0%, #ff8f5e 100%);
  color: #fff;
  text-align: center;
  padding: 64px 0;
}

.cta-band__title {
  font-size: 28px;
  margin-bottom: 12px;
}

.cta-band .btn--primary {
  background: #fff;
  color: var(--color-primary);
  margin-top: 20px;
}

/* ---------- Stats strip ---------- */

.stats-strip {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 16px;
  text-align: center;
}

.stats-strip__item strong {
  display: block;
  font-size: 28px;
  color: var(--color-dark);
}

.stats-strip__item span {
  color: var(--color-text-light);
  font-size: 14px;
}

/* ---------- Footer ---------- */

.site-footer {
  background: var(--color-dark);
  color: #aeb8c8;
  padding: 48px 0 24px;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 32px;
  margin-bottom: 32px;
}

.site-footer__brand {
  font-size: 20px;
  font-weight: 700;
  color: #fff;
}

.site-footer h4 {
  color: #fff;
  font-size: 15px;
  margin-bottom: 12px;
}

.site-footer ul {
  list-style: none;
}

.site-footer li {
  margin-bottom: 8px;
}

.site-footer a {
  color: #aeb8c8;
  font-size: 14px;
}

.site-footer a:hover {
  color: #fff;
}

.site-footer__bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  padding-top: 20px;
  font-size: 13px;
  text-align: center;
}

/* ---------- Page hero (sub pages) ---------- */

.page-hero {
  background: var(--color-bg-soft);
  border-bottom: 1px solid var(--color-border);
  padding: 56px 0;
  text-align: center;
}

.page-hero__title {
  font-size: 34px;
  color: var(--color-dark);
  margin-bottom: 10px;
}

.page-hero__subtitle {
  color: var(--color-text-light);
  max-width: 620px;
  margin: 0 auto;
}

/* ---------- Responsive ---------- */

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .main-nav {
    display: none;
    width: 100%;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
  }

  .main-nav.is-open {
    display: block;
  }

  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 8px 0;
  }

  .main-nav li {
    padding: 10px 20px;
  }

  .site-header__inner {
    flex-wrap: wrap;
  }

  .hero__title {
    font-size: 30px;
  }
}