/* ============================================================
   DarkStone Labs - 鏋佽嚧绠€绾β风‖鏍告暟鎹?   Zinc/Stone Dark Minimalist Theme
   ============================================================ */

/* --- CSS Variables --- */
:root {
  --color-bg: #0a0a0b;
  --color-surface: #111113;
  --color-surface-raised: #18181b;
  --color-border: #27272a;
  --color-border-subtle: #1f1f22;
  --color-text-primary: #fafafa;
  --color-text-secondary: #a1a1aa;
  --color-text-muted: #71717a;
  --color-accent: #e4e4e7;
  --color-accent-dim: #a1a1aa;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', monospace;
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 300ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 400ms cubic-bezier(0.34, 1.56, 0.64, 1);
}

/* --- Reset & Base --- */
*,
*::before,
*::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

a {
  text-decoration: none;
  color: inherit;
}

ul {
  list-style: none;
}

/* --- Thin Divider --- */
.thin-divider {
  width: 100%;
  height: 1px;
  background: var(--color-border);
  border: none;
}

.thin-divider-short {
  width: 60px;
  height: 1px;
  background: var(--color-text-muted);
  border: none;
}

/* --- Section Spacing --- */
.section {
  padding: 7rem 0;
}

.section-header {
  margin-bottom: 4rem;
}

.section-label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-text-muted);
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--color-border);
}

.section-title {
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

.section-subtitle {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  line-height: 1.7;
  font-weight: 400;
}

/* --- Container --- */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

/* ============================================================
   1. NAVBAR
   ============================================================ */

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  padding: 1.25rem 0;
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth), padding var(--transition-smooth);
}

.navbar.scrolled {
  background: rgba(10, 10, 11, 0.92);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  box-shadow: 0 1px 0 var(--color-border-subtle);
  padding: 0.85rem 0;
}

.navbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  text-decoration: none;
}

.navbar-brand i {
  font-size: 1.3rem;
  color: var(--color-accent);
}

.navbar-links {
  display: flex;
  align-items: center;
  gap: 2.25rem;
}

.navbar-links a {
  font-size: 0.875rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
  position: relative;
  letter-spacing: 0.01em;
}

.navbar-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-accent);
  transition: width var(--transition-smooth);
}

.navbar-links a:hover {
  color: var(--color-text-primary);
}

.navbar-links a:hover::after {
  width: 100%;
}

.navbar-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.55rem 1.35rem;
  font-size: 0.825rem;
  font-weight: 600;
  color: var(--color-bg);
  background: var(--color-accent);
  border: none;
  border-radius: 6px;
  cursor: pointer;
  transition: opacity var(--transition-fast);
}

.navbar-cta:hover {
  opacity: 0.85;
}

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  background: none;
  border: none;
  padding: 4px;
  z-index: 1001;
}

.hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--color-text-primary);
  transition: transform var(--transition-smooth), opacity var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.hamburger.active span:nth-child(2) {
  opacity: 0;
}

.hamburger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Mobile Menu */
.mobile-menu {
  display: none;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100vh;
  background: rgba(10, 10, 11, 0.98);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 999;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
}

.mobile-menu.active {
  display: flex;
}

.mobile-menu a {
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--color-text-secondary);
  transition: color var(--transition-fast);
}

.mobile-menu a:hover {
  color: var(--color-text-primary);
}

/* ============================================================
   2. HERO
   ============================================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding-top: 5rem;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(39, 39, 42, 0.25) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero::after {
  content: '';
  position: absolute;
  bottom: -30%;
  left: -10%;
  width: 400px;
  height: 400px;
  background: radial-gradient(circle, rgba(39, 39, 42, 0.15) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.hero .container {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 4rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.725rem;
  letter-spacing: 0.15em;
  color: var(--color-text-muted);
  text-transform: uppercase;
  margin-bottom: 2rem;
  padding: 0.4rem 1rem;
  border: 1px solid var(--color-border);
  border-radius: 2px;
}

.hero-tag .dot {
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: #22c55e;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.35; }
}

.hero-title {
  font-size: clamp(2.75rem, 6vw, 4.5rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--color-text-primary);
  margin-bottom: 1.5rem;
}

.hero-title em {
  font-style: normal;
  color: transparent;
  background: linear-gradient(135deg, #e4e4e7 0%, #a1a1aa 100%);
  -webkit-background-clip: text;
  background-clip: text;
}

.hero-desc {
  font-size: 1.1rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  max-width: 460px;
  margin-bottom: 2.5rem;
}

.hero-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.8rem 2rem;
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 6px;
  cursor: pointer;
  border: none;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background: #d4d4d8;
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  border-color: var(--color-text-muted);
  background: rgba(255, 255, 255, 0.03);
}

.hero-visual {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
}

.hero-dashboard {
  width: 100%;
  max-width: 520px;
  background: var(--color-surface-raised);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
}

.hero-dashboard-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1rem;
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.hero-dashboard-header .db-dots {
  display: flex;
  gap: 6px;
}

.hero-dashboard-header .db-dots span {
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.hero-dashboard-header .db-dots span:nth-child(1) { background: #ef4444; }
.hero-dashboard-header .db-dots span:nth-child(2) { background: #eab308; }
.hero-dashboard-header .db-dots span:nth-child(3) { background: #22c55e; }

.hero-dashboard-header .db-title {
  font-family: var(--font-mono);
  font-size: 0.675rem;
  color: var(--color-text-muted);
  margin-left: 0.5rem;
}

.hero-dashboard-body {
  padding: 1.25rem;
}

.db-chart {
  display: flex;
  align-items: flex-end;
  gap: 4px;
  height: 140px;
  padding: 0.5rem 0;
  margin-bottom: 1rem;
}

.db-chart .db-bar {
  flex: 1;
  border-radius: 2px 2px 0 0;
  background: linear-gradient(180deg, #a1a1aa 0%, #3f3f46 100%);
  transition: height var(--transition-smooth);
}

.db-stats {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 0.75rem;
}

.db-stat {
  text-align: center;
  padding: 0.75rem 0.5rem;
  border: 1px solid var(--color-border);
  border-radius: 6px;
}

.db-stat .db-stat-value {
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-primary);
}

.db-stat .db-stat-label {
  font-size: 0.65rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}

.db-code-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--color-text-muted);
  padding: 0.45rem 0;
  border-bottom: 1px solid rgba(39, 39, 42, 0.5);
}

.db-code-line .line-num {
  color: #52525b;
  min-width: 18px;
}

.db-code-line .hl {
  color: #a1a1aa;
}

.db-code-line .hl-blue {
  color: #7dd3fc;
}

.db-code-line .hl-green {
  color: #86efac;
}

/* ============================================================
   3. FEATURES
   ============================================================ */

.features {
  position: relative;
}

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

.feature-card {
  background: var(--color-surface);
  padding: 2.5rem 2rem;
  transition: background var(--transition-smooth), box-shadow var(--transition-smooth);
  position: relative;
}

.feature-card:hover {
  background: var(--color-surface-raised);
  box-shadow: 0 8px 40px rgba(0, 0, 0, 0.4);
  z-index: 1;
}

.feature-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  font-size: 1.25rem;
  color: var(--color-accent);
  border: 1px solid var(--color-border);
  border-radius: 4px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: 0.75rem;
  letter-spacing: -0.01em;
}

.feature-card p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

.feature-footer-meta {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  margin-top: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.625rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

/* ============================================================
   4. STATS
   ============================================================ */

.stats-section {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
}

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

.stat-item {
  text-align: center;
  padding: 3.5rem 2rem;
  position: relative;
}

.stat-item:not(:last-child)::after {
  content: '';
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 50px;
  background: var(--color-border);
}

.stat-number {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  color: transparent;
  -webkit-text-stroke: 1px var(--color-accent);
  text-stroke: 1px var(--color-accent);
  line-height: 1;
  margin-bottom: 0.75rem;
}

.stat-label {
  font-size: 0.8rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 500;
}

.stat-sublabel {
  font-size: 0.7rem;
  color: var(--color-text-muted);
  margin-top: 0.25rem;
  opacity: 0.6;
}

/* ============================================================
   5. TESTIMONIALS
   ============================================================ */

.testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 3rem;
}

.testimonial-item {
  padding: 0;
}

.testimonial-stars {
  color: #e4e4e7;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.testimonial-text {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.75;
  margin-bottom: 1.75rem;
  position: relative;
  padding-left: 1rem;
  border-left: 2px solid var(--color-border);
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.testimonial-author-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-surface-raised);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.8rem;
  color: var(--color-text-muted);
  border: 1px solid var(--color-border);
}

.testimonial-author-info strong {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-primary);
}

.testimonial-author-info span {
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ============================================================
   6. FAQ
   ============================================================ */

.faq {
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
}

.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 1.5rem 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-size: 1rem;
  font-weight: 500;
  color: var(--color-text-primary);
  transition: color var(--transition-fast);
  letter-spacing: -0.01em;
}

.faq-question:hover {
  color: var(--color-accent);
}

.faq-icon {
  font-size: 0.75rem;
  color: var(--color-text-muted);
  transition: transform var(--transition-smooth);
  flex-shrink: 0;
  margin-left: 1rem;
}

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

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-smooth), padding var(--transition-smooth);
}

.faq-item.active .faq-answer {
  max-height: 300px;
}

.faq-answer-inner {
  padding: 0 0 1.5rem;
  font-size: 0.925rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
}

/* ============================================================
   7. CTA SECTION
   ============================================================ */

.cta-section {
  position: relative;
  overflow: hidden;
  background: var(--color-surface-raised);
}

.cta-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background:
    linear-gradient(135deg, rgba(228, 228, 231, 0.03) 0%, transparent 50%);
  pointer-events: none;
}

.cta-inner {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.cta-inner h2 {
  font-size: clamp(2rem, 4vw, 2.75rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--color-text-primary);
  margin-bottom: 1rem;
  line-height: 1.15;
}

.cta-inner p {
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  margin-bottom: 2.5rem;
  line-height: 1.7;
}

.cta-inner .btn-primary {
  font-size: 0.95rem;
  padding: 0.95rem 2.5rem;
}

.cta-inner .cta-note {
  display: block;
  margin-top: 1.25rem;
  font-size: 0.75rem;
  color: var(--color-text-muted);
}

/* ============================================================
   8. FOOTER
   ============================================================ */

.footer {
  padding: 4rem 0 2rem;
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  margin-bottom: 3rem;
}

.footer-brand p {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-top: 1rem;
  max-width: 260px;
}

.footer-col h4 {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-primary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 1.25rem;
}

.footer-col a {
  display: block;
  font-size: 0.85rem;
  color: var(--color-text-muted);
  margin-bottom: 0.6rem;
  transition: color var(--transition-fast);
}

.footer-col a:hover {
  color: var(--color-text-primary);
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-border);
}

.footer-copyright {
  font-size: 0.8rem;
  color: var(--color-text-muted);
}

.footer-social {
  display: flex;
  gap: 1.25rem;
}

.footer-social a {
  font-size: 0.95rem;
  color: var(--color-text-muted);
  transition: color var(--transition-fast);
}

.footer-social a:hover {
  color: var(--color-text-primary);
}

/* ============================================================
   ANIMATIONS
   ============================================================ */

.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.fade-up.in-view {
  opacity: 1;
  transform: translateY(0);
}

.fade-up-delay-1 { transition-delay: 0.1s; }
.fade-up-delay-2 { transition-delay: 0.2s; }
.fade-up-delay-3 { transition-delay: 0.3s; }
.fade-up-delay-4 { transition-delay: 0.4s; }
.fade-up-delay-5 { transition-delay: 0.5s; }
.fade-up-delay-6 { transition-delay: 0.6s; }

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 1024px) {
  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .testimonials-grid {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .stat-item:nth-child(2)::after {
    display: none;
  }

  .stat-item:nth-child(odd)::after {
    content: '';
    position: absolute;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    width: 1px;
    height: 50px;
    background: var(--color-border);
  }

  .stat-item:nth-child(n+3) {
    border-top: 1px solid var(--color-border);
  }

  .hero .container {
    grid-template-columns: 1fr;
    gap: 3rem;
    text-align: center;
  }

  .hero-desc {
    margin: 0 auto 2.5rem;
  }

  .hero-actions {
    justify-content: center;
  }

  .hero-visual {
    max-width: 450px;
    margin: 0 auto;
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 4.5rem 0;
  }

  .navbar-links {
    display: none;
  }

  .hamburger {
    display: flex;
  }

  .features-grid {
    grid-template-columns: 1fr;
  }

  .stats-grid {
    grid-template-columns: 1fr;
  }

  .stat-item::after {
    display: none !important;
  }

  .stat-item:not(:last-child) {
    border-bottom: 1px solid var(--color-border);
  }

  .hero-title {
    font-size: 2.25rem;
  }

  .section-title {
    font-size: 1.65rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .footer-bottom {
    flex-direction: column;
    gap: 1rem;
    text-align: center;
  }

  .cta-inner h2 {
    font-size: 1.75rem;
  }
}
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