/* ==========================================================================
   NEXTIN — HIGH-PRECISION TECH STYLESHEET
   Design System: Obsidian #0B0B0C | Panels #111113 | Borders #222225
   Accent: Electric Lime #C9F73A | Fonts: Space Grotesk, Manrope, JetBrains Mono
   ========================================================================== */

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

:root {
  --bg-obsidian: #0B0B0C;
  --bg-panel: #111113;
  --bg-panel-hover: #161619;
  --border-hairline: #222225;
  --border-light: #2D2D32;
  --text-primary: #F4F4F1;
  --text-secondary: #90908A;
  --text-muted: #60605B;
  --accent-lime: #C9F73A;
  --accent-lime-dim: rgba(201, 247, 58, 0.12);
  --accent-lime-glow: rgba(201, 247, 58, 0.25);
  
  --font-headline: 'Space Grotesk', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-body: 'Manrope', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;

  --radius-sharp: 2px;
  --max-width: 1200px;
  --transition: all 0.2s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.6;
  background-color: var(--bg-obsidian);
  color: var(--text-primary);
  overflow-x: hidden;
}

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

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

ul, ol {
  list-style: none;
}

/* ==========================================================================
   UTILITY & TYPOGRAPHY
   ========================================================================== */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.mono-label {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-secondary);
}

.mono-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  padding: 4px 10px;
  background: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  color: var(--accent-lime);
  border-radius: var(--radius-sharp);
}

.mono-tag .pulse-dot {
  width: 6px;
  height: 6px;
  background-color: var(--accent-lime);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--accent-lime);
  animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.4; transform: scale(0.85); }
}

.section-idx {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-lime);
  letter-spacing: 0.14em;
  display: block;
  margin-bottom: 8px;
}

.section-header {
  margin-bottom: 48px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 24px;
}

.section-title {
  font-family: var(--font-headline);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-top: 6px;
}

.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  margin-top: 10px;
  max-width: 680px;
}

.text-lime {
  color: var(--accent-lime);
}

/* Lime sweep underline on link hover */
.hover-lime-sweep {
  position: relative;
  display: inline-block;
}

.hover-lime-sweep::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--accent-lime);
  transition: width 0.25s cubic-bezier(0.16, 1, 0.3, 1);
}

.hover-lime-sweep:hover::after {
  width: 100%;
}

/* ==========================================================================
   BUTTONS (0-2px Radius, High Precision)
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  padding: 14px 28px;
  border-radius: var(--radius-sharp);
  cursor: pointer;
  transition: var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--accent-lime);
  color: #0B0B0C;
  border: 1px solid var(--accent-lime);
}

.btn-primary:hover {
  background-color: #D6FA5A;
  box-shadow: 0 0 20px var(--accent-lime-glow);
  transform: translateY(-1px);
}

.btn-ghost {
  background-color: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-hairline);
}

.btn-ghost:hover {
  border-color: var(--accent-lime);
  color: var(--accent-lime);
  background-color: var(--accent-lime-dim);
  transform: translateY(-1px);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 11px;
}

.btn svg {
  width: 14px;
  height: 14px;
  transition: transform 0.2s ease;
}

.btn:hover svg {
  transform: translateX(3px);
}

/* ==========================================================================
   HEADER / NAVIGATION
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(11, 11, 12, 0.88);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-hairline);
  height: 68px;
}

.nav-container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.brand-logo .logo-mark {
  width: 18px;
  height: 18px;
  background-color: var(--accent-lime);
  border-radius: var(--radius-sharp);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-logo .logo-mark-inner {
  width: 6px;
  height: 6px;
  background-color: #0B0B0C;
}

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

.nav-menu {
  display: flex;
  align-items: center;
  gap: 28px;
}

.nav-link {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  color: var(--text-secondary);
}

.nav-link:hover, .nav-link.active {
  color: var(--accent-lime);
}

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

/* ==========================================================================
   HERO SECTION
   ========================================================================== */
.hero-section {
  padding: 96px 0 72px 0;
  border-bottom: 1px solid var(--border-hairline);
  position: relative;
  overflow: hidden;
}

.hero-content {
  max-width: 860px;
}

.hero-meta {
  margin-bottom: 24px;
}

.hero-headline {
  font-family: var(--font-headline);
  font-size: clamp(38px, 5.8vw, 68px);
  font-weight: 700;
  line-height: 1.08;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: 24px;
}

.hero-desc {
  font-size: 18px;
  line-height: 1.65;
  color: var(--text-secondary);
  margin-bottom: 36px;
  max-width: 700px;
}

.hero-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 32px;
}

.hero-tech-specs {
  display: flex;
  align-items: center;
  gap: 20px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

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

.hero-tech-specs span::before {
  content: '✓';
  color: var(--accent-lime);
  font-weight: bold;
}

/* ==========================================================================
   STATS STRIP (Full-width separated by hairlines)
   ========================================================================== */
.stats-strip {
  border-bottom: 1px solid var(--border-hairline);
  background-color: var(--bg-panel);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat-item {
  padding: 32px 24px;
  border-right: 1px solid var(--border-hairline);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.stat-item:last-child {
  border-right: none;
}

.stat-val {
  font-family: var(--font-headline);
  font-size: 38px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--accent-lime);
  line-height: 1;
  margin-bottom: 8px;
}

.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

/* ==========================================================================
   SECTION 01: CORE ADVANTAGES (3 Hairline Panels)
   ========================================================================== */
.advantages-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.advantages-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  border: 1px solid var(--border-hairline);
  background-color: var(--border-hairline);
  gap: 1px;
}

.adv-panel {
  background-color: var(--bg-obsidian);
  padding: 40px 32px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 380px;
  transition: var(--transition);
}

.adv-panel:hover {
  background-color: var(--bg-panel);
}

.adv-num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-lime);
  letter-spacing: 0.14em;
  margin-bottom: 32px;
}

.adv-icon-wrap {
  width: 48px;
  height: 48px;
  border: 1px solid var(--border-hairline);
  background: var(--bg-panel);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  border-radius: var(--radius-sharp);
}

.adv-icon-wrap svg {
  width: 24px;
  height: 24px;
  stroke: var(--accent-lime);
}

.adv-title {
  font-family: var(--font-headline);
  font-size: 22px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin-bottom: 14px;
}

.adv-text {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.adv-meta {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.14em;
  text-transform: uppercase;
  border-top: 1px solid var(--border-hairline);
  padding-top: 16px;
}

/* ==========================================================================
   SECTION 02: STREAMING & AI SUPPORT
   ========================================================================== */
.ecosystem-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.ecosystem-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.eco-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  padding: 36px;
  border-radius: var(--radius-sharp);
  transition: var(--transition);
}

.eco-card:hover {
  border-color: var(--border-light);
}

.eco-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}

.eco-tag {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent-lime);
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.eco-card h3 {
  font-family: var(--font-headline);
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.eco-card p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.65;
  margin-bottom: 24px;
}

.service-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.service-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  background-color: var(--bg-obsidian);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sharp);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-primary);
  letter-spacing: 0.05em;
}

.service-badge span.dot {
  width: 5px;
  height: 5px;
  background-color: var(--accent-lime);
  border-radius: 50%;
}

/* ==========================================================================
   SECTION 03: PRICING COMPARISON TABLE
   ========================================================================== */
.pricing-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  border: 1px solid var(--border-hairline);
  background-color: var(--border-hairline);
  gap: 1px;
}

.pricing-card {
  background-color: var(--bg-obsidian);
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  position: relative;
  transition: var(--transition);
}

.pricing-card:hover {
  background-color: var(--bg-panel);
}

.pricing-card.popular {
  background-color: var(--bg-panel);
  outline: 1px solid var(--accent-lime);
  z-index: 2;
}

.pricing-badge-popular {
  position: absolute;
  top: 16px;
  right: 16px;
  background: var(--accent-lime);
  color: #0B0B0C;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.14em;
  padding: 3px 8px;
  border-radius: var(--radius-sharp);
  text-transform: uppercase;
}

.plan-tier {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.plan-name {
  font-family: var(--font-headline);
  font-size: 22px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.plan-price-wrap {
  display: flex;
  align-items: baseline;
  gap: 4px;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-hairline);
  padding-bottom: 20px;
}

.plan-currency {
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--accent-lime);
}

.plan-price {
  font-family: var(--font-headline);
  font-size: 42px;
  font-weight: 700;
  letter-spacing: -0.03em;
  color: var(--text-primary);
}

.plan-period {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-secondary);
}

.plan-features {
  margin-bottom: 32px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.plan-feature-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.4;
}

.plan-feature-item svg {
  width: 14px;
  height: 14px;
  stroke: var(--accent-lime);
  flex-shrink: 0;
  margin-top: 2px;
}

.plan-feature-item strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ==========================================================================
   SECTION 04: USER REVIEWS & TESTIMONIALS
   ========================================================================== */
.reviews-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.reviews-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.review-card {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  padding: 28px;
  border-radius: var(--radius-sharp);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.review-stars {
  display: flex;
  gap: 4px;
  color: var(--accent-lime);
  margin-bottom: 16px;
}

.review-stars svg {
  width: 14px;
  height: 14px;
  fill: currentColor;
}

.review-text {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-primary);
  margin-bottom: 20px;
}

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

.author-avatar {
  width: 36px;
  height: 36px;
  border-radius: var(--radius-sharp);
  background-color: var(--bg-obsidian);
  border: 1px solid var(--border-hairline);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent-lime);
  font-weight: 700;
}

.author-info h4 {
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
}

.author-info p {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
}

/* ==========================================================================
   SECTION 05: FAQ (ACCORDION / CLEAN BLOCKS)
   ========================================================================== */
.faq-section {
  padding: 96px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.faq-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  max-width: 900px;
  margin: 0 auto;
}

.faq-item {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  border-radius: var(--radius-sharp);
  overflow: hidden;
  transition: var(--transition);
}

.faq-item:hover {
  border-color: var(--border-light);
}

.faq-question {
  padding: 22px 28px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-family: var(--font-headline);
  font-size: 18px;
  font-weight: 700;
  color: var(--text-primary);
}

.faq-question span.toggle-icon {
  font-family: var(--font-mono);
  color: var(--accent-lime);
  font-size: 16px;
}

.faq-answer {
  padding: 0 28px 24px 28px;
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  border-top: 1px solid rgba(34, 34, 37, 0.4);
  padding-top: 16px;
}

/* ==========================================================================
   FOOTER (Strictly 4 Links: Sitemap, About, Terms, Privacy)
   ========================================================================== */
.site-footer {
  background-color: #070708;
  border-top: 1px solid var(--border-hairline);
  padding: 64px 0 40px 0;
}

.footer-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: 40px;
  border-bottom: 1px solid var(--border-hairline);
}

.footer-nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.footer-nav-link {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-secondary);
}

.footer-nav-link:hover {
  color: var(--accent-lime);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 32px;
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--text-muted);
  letter-spacing: 0.14em;
}

/* ==========================================================================
   SUBPAGE & BLOG CONTENT STYLES
   ========================================================================== */
.article-header {
  padding: 80px 0 48px 0;
  border-bottom: 1px solid var(--border-hairline);
}

.article-body {
  padding: 64px 0;
  max-width: 860px;
  margin: 0 auto;
}

.article-body h2 {
  font-family: var(--font-headline);
  font-size: 26px;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  margin: 40px 0 16px 0;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-hairline);
}

.article-body h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  margin: 28px 0 12px 0;
}

.article-body p {
  font-size: 16px;
  line-height: 1.8;
  color: #CCCCCC;
  margin-bottom: 20px;
}

.article-body ul, .article-body ol {
  margin: 0 0 24px 20px;
}

.article-body li {
  font-size: 15px;
  line-height: 1.75;
  color: #CCCCCC;
  margin-bottom: 8px;
  list-style-type: square;
}

.article-body blockquote {
  border-left: 2px solid var(--accent-lime);
  background-color: var(--bg-panel);
  padding: 16px 20px;
  margin: 24px 0;
  color: var(--text-secondary);
  font-style: normal;
}

.article-body code {
  font-family: var(--font-mono);
  background-color: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  padding: 2px 6px;
  font-size: 13px;
  color: var(--accent-lime);
  border-radius: var(--radius-sharp);
}

.article-body pre {
  background-color: var(--bg-panel);
  border: 1px solid var(--border-hairline);
  padding: 20px;
  overflow-x: auto;
  border-radius: var(--radius-sharp);
  margin-bottom: 24px;
}

.article-body pre code {
  background: none;
  border: none;
  padding: 0;
  color: var(--text-primary);
  font-size: 13px;
}

.article-body a {
  color: var(--accent-lime);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.article-body a:hover {
  color: #D6FA5A;
}

/* ==========================================================================
   RESPONSIVE DESIGN (@media Queries)
   ========================================================================== */
@media (max-width: 1024px) {
  .pricing-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .advantages-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
    padding: 14px 0;
  }
  .nav-container {
    flex-direction: column;
    gap: 14px;
    align-items: flex-start;
  }
  .nav-menu {
    flex-wrap: wrap;
    gap: 16px;
  }
  .nav-cta {
    width: 100%;
  }
  .nav-cta .btn {
    width: 100%;
  }
  .hero-section {
    padding: 56px 0 48px 0;
  }
  .hero-headline {
    font-size: 34px;
  }
  .hero-desc {
    font-size: 16px;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
  }
  .hero-actions .btn {
    width: 100%;
    padding: 16px 20px;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .stat-item {
    border-right: none;
    border-bottom: 1px solid var(--border-hairline);
    padding: 24px 16px;
  }
  .stat-val {
    font-size: 30px;
  }
  .advantages-grid {
    grid-template-columns: 1fr;
  }
  .ecosystem-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .reviews-grid {
    grid-template-columns: 1fr;
  }
  .footer-top {
    flex-direction: column;
    gap: 24px;
    align-items: flex-start;
  }
  .footer-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 16px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 12px;
    align-items: flex-start;
  }
}