/* ==========================================================================
   iKuuu VPN - Pure CSS Stylesheet
   Color Palette:
   - Background: #F2F7F5 (Mist White)
   - Text: #10201C (Deep Forest Ink)
   - Primary: #12B49B (Aurora Cyan)
   - Accent: #FF6B4A (Coral Orange)
   - Secondary: #5B6E68 (Sage Grey-Green)
   - Border: 1px solid #D6E2DE
   - Card Background: #FFFFFF
   Fonts: Space Grotesk (Headings), IBM Plex Sans (Body), IBM Plex Mono (Labels/Numbers)
   ========================================================================== */

@import url('https://fonts.googleapis.com/css2?family=IBM+Plex+Mono:wght@400;500;600&family=IBM+Plex+Sans:wght@400;500;600;700&family=Space+Grotesk:wght@500;600;700&display=swap');

:root {
  --bg-color: #F2F7F5;
  --surface-color: #FFFFFF;
  --surface-alt: #E8F0EC;
  --text-main: #10201C;
  --text-muted: #5B6E68;
  --primary: #12B49B;
  --primary-hover: #0EA28B;
  --primary-light: #E0F7F3;
  --accent: #FF6B4A;
  --accent-hover: #E85838;
  --accent-light: #FFEFEA;
  --border-color: #D6E2DE;
  --border-strong: #B4C6C0;
  
  --font-heading: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;

  --max-width: 1200px;
  --transition: 150ms ease-in-out;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-color);
  color: var(--text-main);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

img, svg {
  display: block;
  max-width: 100%;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition), border-color var(--transition), background-color var(--transition);
}

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

/* ================= Top Announcement / Sticky Nav ================= */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(242, 247, 245, 0.95);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border-color);
}

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.02em;
  color: var(--text-main);
}

.logo-icon {
  width: 36px;
  height: 36px;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-link {
  font-size: 15px;
  font-weight: 500;
  color: var(--text-muted);
}

.nav-link:hover, .nav-link.active {
  color: var(--text-main);
}

.nav-badge-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--primary);
  font-weight: 600;
}

.nav-badge-link span {
  font-family: var(--font-mono);
  font-size: 11px;
  background: var(--primary-light);
  color: var(--primary);
  padding: 2px 6px;
  border-radius: 2px;
  border: 1px solid rgba(18, 180, 155, 0.3);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ================= Buttons ================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 24px;
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  text-align: center;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all var(--transition);
  border-radius: 4px;
}

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

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

.btn-accent {
  background-color: var(--accent);
  color: #FFFFFF;
}

.btn-accent:hover {
  background-color: var(--accent-hover);
}

.btn-outline {
  background-color: transparent;
  border-color: var(--border-strong);
  color: var(--text-main);
}

.btn-outline:hover {
  background-color: var(--surface-color);
  border-color: var(--text-main);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 14px;
}

.btn-lg {
  padding: 15px 32px;
  font-size: 16px;
}

/* ================= Hero Section ================= */
.hero-section {
  padding: 70px 0 60px;
  border-bottom: 1px solid var(--border-color);
  background-color: var(--bg-color);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  text-transform: uppercase;
  color: var(--text-muted);
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 6px 14px;
  border-radius: 2px;
  margin-bottom: 20px;
}

.hero-tag .dot {
  width: 8px;
  height: 8px;
  background-color: var(--primary);
  border-radius: 50%;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: 46px;
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-main);
  margin-bottom: 20px;
}

.hero-title span.brand {
  color: var(--primary);
}

.hero-desc {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 32px;
  max-width: 580px;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-bottom: 28px;
}

.hero-notice {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.hero-notice span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ================= Hero VPN Interactive Switch Card ================= */
.vpn-switch-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 32px;
  box-shadow: 0 4px 20px rgba(16, 32, 28, 0.04);
}

.card-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border-color);
  margin-bottom: 24px;
}

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 2px;
  letter-spacing: 0.05em;
  transition: all var(--transition);
}

.status-badge.unprotected {
  background-color: var(--accent-light);
  color: var(--accent);
  border: 1px solid rgba(255, 107, 74, 0.3);
}

.status-badge.protected {
  background-color: var(--primary-light);
  color: var(--primary);
  border: 1px solid rgba(18, 180, 155, 0.3);
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: currentColor;
}

.switch-visual {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 24px 0;
  text-align: center;
}

.switch-button-wrap {
  position: relative;
  margin-bottom: 24px;
}

.connection-toggle-btn {
  width: 96px;
  height: 96px;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  background-color: var(--surface-color);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.25s ease;
  position: relative;
}

.connection-toggle-btn:hover {
  transform: scale(1.04);
}

.connection-toggle-btn.is-active {
  border-color: var(--primary);
  background-color: var(--primary-light);
}

.toggle-icon {
  width: 44px;
  height: 44px;
  transition: transform 0.25s ease;
}

.toggle-status-text {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 4px;
}

.toggle-sub-text {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}

.telemetry-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  padding-top: 24px;
  border-top: 1px solid var(--border-color);
  margin-top: 16px;
}

.telemetry-item {
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  padding: 12px 16px;
}

.telemetry-label {
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  color: var(--text-muted);
  margin-bottom: 4px;
}

.telemetry-val {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-main);
}

/* ================= Stat Banner (Speed Strip) ================= */
.speed-strip {
  background-color: var(--surface-color);
  border-bottom: 1px solid var(--border-color);
  padding: 32px 0;
}

.speed-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.speed-card {
  padding: 16px 20px;
  border-left: 2px solid var(--primary);
}

.speed-number {
  font-family: var(--font-mono);
  font-size: 28px;
  font-weight: 700;
  color: var(--text-main);
  line-height: 1.1;
  margin-bottom: 4px;
}

.speed-number span {
  font-size: 16px;
  color: var(--primary);
  font-weight: 500;
}

.speed-label {
  font-size: 14px;
  color: var(--text-muted);
}

/* ================= Section Header ================= */
.section-wrap {
  padding: 80px 0;
  border-bottom: 1px solid var(--border-color);
}

.section-head {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 56px;
}

.section-eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  color: var(--primary);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.section-title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-main);
  margin-bottom: 16px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-muted);
}

/* ================= Core Advantages (3 Cards) ================= */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 36px 30px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}

.feature-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.feature-icon-box {
  width: 48px;
  height: 48px;
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
}

.feature-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 600;
  color: var(--text-main);
  margin-bottom: 12px;
}

.feature-text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ================= Streaming & AI Section ================= */
.media-ai-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}

.media-ai-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 36px;
}

.tag-cluster {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 20px 0;
}

.tech-tag {
  font-family: var(--font-mono);
  font-size: 13px;
  padding: 6px 14px;
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  color: var(--text-main);
}

.tech-tag.highlight {
  border-color: var(--primary);
  color: var(--primary);
  background-color: var(--primary-light);
}

/* ================= Server Nodes Grid ================= */
.nodes-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.node-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 20px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.node-info {
  display: flex;
  align-items: center;
  gap: 14px;
}

.node-flag {
  font-size: 22px;
  line-height: 1;
}

.node-name {
  font-weight: 600;
  font-size: 15px;
  color: var(--text-main);
}

.node-type {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

.node-latency {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: 6px;
}

.latency-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background-color: var(--primary);
}

/* ================= Pricing Table ================= */
.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  align-items: stretch;
}

.pricing-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  position: relative;
  transition: transform var(--transition);
}

.pricing-card.featured {
  border: 2px solid var(--primary);
}

.featured-ribbon {
  position: absolute;
  top: -12px;
  left: 32px;
  background-color: var(--primary);
  color: #FFFFFF;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  padding: 3px 10px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.pricing-plan {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 6px;
}

.pricing-sub {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pricing-price {
  font-family: var(--font-mono);
  font-size: 40px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 4px;
  line-height: 1;
}

.pricing-price small {
  font-size: 14px;
  color: var(--text-muted);
  font-weight: 400;
}

.pricing-features {
  list-style: none;
  margin: 32px 0;
  flex-grow: 1;
  border-top: 1px solid var(--border-color);
  padding-top: 24px;
}

.pricing-features li {
  font-size: 14px;
  color: var(--text-main);
  margin-bottom: 12px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li svg {
  color: var(--primary);
  flex-shrink: 0;
}

/* ================= Reviews / Testimonials ================= */
.review-stats-bar {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  padding: 16px;
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  margin-bottom: 36px;
  font-family: var(--font-mono);
}

.rating-stars {
  color: #FFB800;
  display: inline-flex;
  gap: 4px;
  font-size: 18px;
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.review-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 28px 24px;
  display: flex;
  flex-direction: column;
}

.review-text {
  font-size: 15px;
  color: var(--text-main);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.review-author {
  display: flex;
  align-items: center;
  gap: 12px;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.author-avatar {
  width: 36px;
  height: 36px;
  background-color: var(--surface-alt);
  border: 1px solid var(--border-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
}

.author-meta {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-main);
}

.author-role {
  font-size: 12px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ================= FAQ Accordion ================= */
.faq-wrap {
  max-width: 800px;
  margin: 0 auto;
}

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

.faq-question {
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 20px 24px;
  font-family: var(--font-heading);
  font-size: 17px;
  font-weight: 600;
  color: var(--text-main);
  display: flex;
  align-items: center;
  justify-content: space-between;
  cursor: pointer;
}

.faq-icon {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--primary);
  transition: transform var(--transition);
}

.faq-item.is-open .faq-icon {
  transform: rotate(45deg);
}

.faq-answer {
  display: none;
  padding: 0 24px 20px;
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.65;
  border-top: 1px solid var(--border-color);
  padding-top: 16px;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* ================= Bottom CTA ================= */
.bottom-cta-strip {
  background-color: var(--surface-alt);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 60px 0;
  text-align: center;
}

.bottom-cta-box {
  max-width: 600px;
  margin: 0 auto;
}

/* ================= Footer ================= */
.site-footer {
  background-color: var(--bg-color);
  padding: 48px 0;
  border-top: 1px solid var(--border-color);
}

.footer-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 36px;
  list-style: none;
  margin-bottom: 24px;
}

.footer-link {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-muted);
  padding: 6px 10px;
}

.footer-link:hover {
  color: var(--primary);
}

.footer-copyright {
  text-align: center;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}

/* ================= Auxiliary Static Pages (About, Terms, etc.) ================= */
.article-page {
  padding: 60px 0 100px;
}

.article-header {
  margin-bottom: 40px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border-color);
}

.article-title {
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 700;
  color: var(--text-main);
  margin-bottom: 12px;
}

.article-meta {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text-muted);
}

.article-content {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 48px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-main);
}

.article-content h2 {
  font-family: var(--font-heading);
  font-size: 24px;
  margin: 36px 0 16px;
  color: var(--text-main);
  border-bottom: 1px solid var(--border-color);
  padding-bottom: 8px;
}

.article-content h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  margin: 24px 0 12px;
  color: var(--text-main);
}

.article-content p {
  margin-bottom: 16px;
}

.article-content ul, .article-content ol {
  margin: 16px 0 24px 24px;
}

.article-content li {
  margin-bottom: 8px;
}

.article-content a {
  color: var(--primary);
  text-decoration: underline;
}

.article-content a:hover {
  color: var(--primary-hover);
}

/* ================= News / Recommendations List ================= */
.news-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-top: 36px;
}

.news-card {
  background-color: var(--surface-color);
  border: 1px solid var(--border-color);
  padding: 32px;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition), border-color var(--transition);
}

.news-card:hover {
  border-color: var(--primary);
  transform: translateY(-2px);
}

.news-date {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.news-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--text-main);
  margin-bottom: 14px;
}

.news-summary {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
  margin-bottom: 20px;
  flex-grow: 1;
}

.news-link-btn {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  color: var(--primary);
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

/* ================= Responsive Styles ================= */
@media (max-width: 992px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .features-grid, .pricing-grid, .reviews-grid, .speed-grid {
    grid-template-columns: 1fr;
  }
  .nodes-grid, .media-ai-grid, .news-grid {
    grid-template-columns: 1fr;
  }
  .nav-menu {
    display: none;
  }
  .article-content {
    padding: 24px;
  }
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 32px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    width: 100%;
  }
  .footer-nav {
    flex-direction: column;
    gap: 16px;
  }
}