/* 
  =========================================
  DNT Discovery - CSS Design System
  Theme: Dark Premium Tech / Glassmorphism
  =========================================
*/

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&family=Outfit:wght@400;500;600;700;800&display=swap');

/* --- Design Tokens --- */
:root {
  /* Colors */
  --bg-base: #080710;
  --bg-surface: rgba(18, 16, 32, 0.5);
  --bg-surface-hover: rgba(26, 23, 48, 0.75);
  --border-color: rgba(255, 255, 255, 0.08);
  --border-color-hover: rgba(255, 255, 255, 0.16);
  
  --primary: #6366f1; /* Indigo */
  --primary-glow: rgba(99, 102, 241, 0.15);
  --secondary: #14b8a6; /* Teal */
  --secondary-glow: rgba(20, 184, 166, 0.15);
  --accent: #d946ef; /* Fuchsia */
  
  --text-primary: #f8fafc;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  
  /* Fonts */
  --font-sans: 'Inter', sans-serif;
  --font-display: 'Outfit', sans-serif;
  
  /* Layout */
  --max-width: 1200px;
  --header-height: 80px;
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  
  /* Transitions */
  --transition-fast: 0.2s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-normal: 0.4s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

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

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.2;
  color: var(--text-primary);
}

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

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

button, input, textarea {
  font-family: inherit;
  background: none;
  border: none;
  outline: none;
}

/* --- Custom Scrollbar --- */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--bg-base);
}
::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 5px;
  border: 2px solid var(--bg-base);
}
::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}

/* --- Decorative Background Blobs --- */
.ambient-glows {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: -1;
  overflow: hidden;
}

.glow-blob {
  position: absolute;
  border-radius: 50%;
  filter: blur(130px);
  opacity: 0.15;
  mix-blend-mode: screen;
  animation: pulse-glow 12s infinite alternate ease-in-out;
}

.blob-1 {
  width: 40vw;
  height: 40vw;
  background: var(--primary);
  top: -10vw;
  right: -5vw;
}

.blob-2 {
  width: 35vw;
  height: 35vw;
  background: var(--secondary);
  top: 30vw;
  left: -10vw;
  animation-delay: -3s;
}

.blob-3 {
  width: 30vw;
  height: 30vw;
  background: var(--accent);
  top: 70vw;
  right: 15vw;
  animation-delay: -6s;
}

@keyframes pulse-glow {
  0% {
    transform: translate(0, 0) scale(1);
    opacity: 0.12;
  }
  50% {
    transform: translate(5%, 2%) scale(1.1);
    opacity: 0.18;
  }
  100% {
    transform: translate(-3%, -2%) scale(0.95);
    opacity: 0.12;
  }
}

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

.section {
  padding: 100px 0;
  position: relative;
}

.grid {
  display: grid;
  gap: 24px;
}

.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 968px) {
  .grid-2, .grid-3, .grid-4 {
    grid-template-columns: 1fr;
  }
  .section {
    padding: 70px 0;
  }
}

/* --- Premium Buttons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all var(--transition-normal);
  position: relative;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, #4f46e5 100%);
  color: white;
  box-shadow: 0 4px 20px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  color: var(--text-primary);
  backdrop-filter: blur(10px);
}

.btn-secondary:hover {
  background: var(--bg-surface-hover);
  border-color: var(--text-secondary);
  transform: translateY(-2px);
}

.btn-accent {
  background: linear-gradient(135deg, var(--secondary) 0%, #0d9488 100%);
  color: white;
  box-shadow: 0 4px 20px rgba(20, 184, 166, 0.3);
}

.btn-accent:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(20, 184, 166, 0.5);
}

/* --- Header / Navigation --- */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  z-index: 100;
  border-bottom: 1px solid var(--border-color);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(8, 7, 16, 0.7);
  transition: background var(--transition-fast), height var(--transition-fast);
}

.header.scrolled {
  background: rgba(8, 7, 16, 0.9);
  height: 70px;
}

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

.logo {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.5px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--secondary), var(--primary));
  display: inline-block;
}

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

.nav-link {
  font-size: 0.95rem;
  font-weight: 500;
  color: var(--text-secondary);
}

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

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

.menu-toggle {
  display: none;
  font-size: 1.5rem;
  color: var(--text-primary);
  cursor: pointer;
}

@media (max-width: 768px) {
  .menu-toggle {
    display: block;
  }
  
  .nav-menu {
    position: fixed;
    top: var(--header-height);
    left: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background: var(--bg-base);
    flex-direction: column;
    align-items: center;
    padding-top: 50px;
    gap: 40px;
    transform: translateX(100%);
    transition: transform var(--transition-normal);
  }
  
  .nav-menu.open {
    transform: translateX(0);
  }
  
  .nav-cta {
    display: none; /* Can be moved inside nav-menu for mobile if needed */
  }
}

/* --- Hero Section --- */
.hero {
  padding-top: calc(var(--header-height) + 60px);
  padding-bottom: 80px;
  text-align: center;
  overflow: hidden;
}

.hero-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 100px;
  background: rgba(99, 102, 241, 0.08);
  border: 1px solid rgba(99, 102, 241, 0.2);
  color: #a5b4fc;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-tag .tag-dot {
  width: 6px;
  height: 6px;
  background-color: var(--primary);
  border-radius: 50%;
  animation: pulse-dot 1.5s infinite alternate;
}

@keyframes pulse-dot {
  0% { transform: scale(0.8); opacity: 0.5; }
  100% { transform: scale(1.2); opacity: 1; }
}

.hero-title {
  font-size: 4rem;
  max-width: 800px;
  margin: 0 auto 24px;
  letter-spacing: -1px;
}

.hero-title span {
  background: linear-gradient(135deg, var(--text-primary) 30%, rgba(248, 250, 252, 0.7) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-title .gradient-text {
  background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 50%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  font-weight: 800;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 40px;
}

.hero-actions {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-bottom: 60px;
}

@media (max-width: 640px) {
  .hero-title {
    font-size: 2.5rem;
  }
  .hero-actions {
    flex-direction: column;
    align-items: stretch;
    padding: 0 24px;
  }
}

/* --- Hero Visualization --- */
.hero-visual {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--border-color);
  background: linear-gradient(180deg, rgba(255,255,255,0.03) 0%, rgba(0,0,0,0.2) 100%);
  padding: 8px;
  box-shadow: 0 30px 60px -15px rgba(0, 0, 0, 0.8),
              0 0 100px -10px rgba(99, 102, 241, 0.15);
}

.hero-visual-inner {
  border-radius: calc(var(--radius-md) - 8px);
  background: #0d0b18;
  overflow: hidden;
  border: 1px solid rgba(255,255,255,0.03);
}

/* UI Mockup Details */
.mockup-header {
  height: 40px;
  background: #141222;
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
  display: flex;
  align-items: center;
  padding: 0 16px;
  gap: 8px;
}

.mockup-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
}
.mockup-dot.red { background: #ef4444; }
.mockup-dot.yellow { background: #f59e0b; }
.mockup-dot.green { background: #10b981; }

.mockup-content {
  padding: 24px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 24px;
  text-align: left;
}

.mockup-sidebar {
  border-right: 1px solid rgba(255, 255, 255, 0.05);
  padding-right: 20px;
}

.mockup-nav-item {
  height: 36px;
  display: flex;
  align-items: center;
  padding: 0 12px;
  border-radius: 6px;
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 6px;
  font-weight: 500;
}

.mockup-nav-item.active {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text-primary);
}

.mockup-body {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.mockup-panel {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-sm);
  padding: 20px;
}

.mockup-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.mockup-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  padding: 16px;
}

.mockup-card-title {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  margin-bottom: 8px;
}

.mockup-card-val {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 600;
}

.mockup-card-progress {
  height: 6px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 3px;
  margin-top: 12px;
  overflow: hidden;
}

.mockup-card-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
  border-radius: 3px;
  width: 75%;
}

@media (max-width: 768px) {
  .mockup-content {
    grid-template-columns: 1fr;
  }
  .mockup-sidebar {
    display: none;
  }
  .mockup-grid {
    grid-template-columns: 1fr;
  }
}

/* --- Stats Grid --- */
.stats {
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  background: rgba(255, 255, 255, 0.01);
  padding: 60px 0;
}

.stat-item {
  text-align: center;
}

.stat-num {
  font-family: var(--font-display);
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--text-primary) 30%, var(--secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  margin-bottom: 8px;
}

.stat-label {
  font-size: 0.95rem;
  color: var(--text-secondary);
}

/* --- Features (Methodology) Section --- */
.section-header {
  text-align: center;
  max-width: 600px;
  margin: 0 auto 60px;
}

.section-tag {
  color: var(--secondary);
  font-size: 0.85rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 12px;
  display: block;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-desc {
  color: var(--text-secondary);
}

.glass-card {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-normal);
  backdrop-filter: blur(10px);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(800px circle at var(--mouse-x, 0) var(--mouse-y, 0), rgba(255,255,255,0.06), transparent 40%);
  z-index: 1;
  pointer-events: none;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.glass-card:hover::before {
  opacity: 1;
}

.glass-card:hover {
  transform: translateY(-6px);
  border-color: var(--border-color-hover);
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4),
              0 0 30px rgba(99, 102, 241, 0.05);
}

.card-icon-wrapper {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--border-color);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 24px;
  color: var(--primary);
  font-size: 1.25rem;
  position: relative;
  z-index: 2;
}

.glass-card:hover .card-icon-wrapper {
  color: var(--secondary);
  border-color: rgba(20, 184, 166, 0.3);
  background: rgba(20, 184, 166, 0.05);
}

.card-title {
  font-size: 1.25rem;
  margin-bottom: 12px;
  position: relative;
  z-index: 2;
}

.card-desc {
  color: var(--text-secondary);
  font-size: 0.95rem;
  position: relative;
  z-index: 2;
}

/* --- Interactive Section --- */
.interactive-tabs-container {
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 40px;
  display: grid;
  grid-template-columns: 300px 1fr;
  gap: 40px;
  backdrop-filter: blur(10px);
}

.tabs-menu {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tab-btn {
  text-align: left;
  padding: 16px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
}

.tab-btn.active {
  background: rgba(255, 255, 255, 0.03);
  border-color: var(--border-color);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.tab-btn-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}

.tab-btn.active .tab-btn-title {
  color: var(--text-primary);
}

.tab-btn-num {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  color: var(--primary);
  margin-bottom: 4px;
  display: block;
}

.tab-btn.active .tab-btn-num {
  color: var(--secondary);
}

.tabs-content {
  position: relative;
  display: flex;
  align-items: center;
}

.tab-pane {
  display: none;
  opacity: 0;
  transform: translateY(10px);
  transition: all var(--transition-normal);
}

.tab-pane.active {
  display: block;
  opacity: 1;
  transform: translateY(0);
}

.pane-title {
  font-size: 2rem;
  margin-bottom: 16px;
  background: linear-gradient(135deg, #fff 0%, var(--text-secondary) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.pane-desc {
  color: var(--text-secondary);
  margin-bottom: 24px;
  max-width: 600px;
}

.pane-features {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.pane-features li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.95rem;
}

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

@media (max-width: 868px) {
  .interactive-tabs-container {
    grid-template-columns: 1fr;
    padding: 24px;
    gap: 24px;
  }
  .tabs-menu {
    flex-direction: row;
    overflow-x: auto;
    padding-bottom: 10px;
  }
  .tab-btn {
    flex-shrink: 0;
    width: 200px;
  }
  .pane-features {
    grid-template-columns: 1fr;
  }
}

/* --- Testimonials Section --- */
.testimonials-grid {
  margin-top: 40px;
}

.testimonial-card {
  padding: 32px;
}

.testimonial-rating {
  color: #eab308;
  display: flex;
  gap: 4px;
  margin-bottom: 16px;
}

.testimonial-quote {
  color: var(--text-primary);
  font-style: italic;
  font-size: 1rem;
  margin-bottom: 24px;
}

.testimonial-author {
  display: flex;
  align-items: center;
  gap: 16px;
}

.author-img {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: #334155;
  object-fit: cover;
  border: 2px solid rgba(255, 255, 255, 0.1);
}

.author-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.author-role {
  font-size: 0.8rem;
  color: var(--text-secondary);
}

/* --- Call to Action (CTA) Box --- */
.cta-box {
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.12) 0%, rgba(20, 184, 166, 0.05) 100%);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 80px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 30px 60px -20px rgba(0,0,0,0.5);
  backdrop-filter: blur(10px);
}

.cta-box::before {
  content: '';
  position: absolute;
  top: -150px;
  left: 50%;
  transform: translateX(-50%);
  width: 300px;
  height: 300px;
  background: var(--primary);
  filter: blur(150px);
  opacity: 0.2;
  border-radius: 50%;
  pointer-events: none;
}

.cta-title {
  font-size: 3rem;
  margin-bottom: 16px;
  letter-spacing: -1px;
}

.cta-desc {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 600px;
  margin: 0 auto 32px;
}

@media (max-width: 768px) {
  .cta-box {
    padding: 50px 24px;
  }
  .cta-title {
    font-size: 2rem;
  }
}

/* --- Footer --- */
.footer {
  border-top: 1px solid var(--border-color);
  background: #04030a;
  padding: 60px 0 30px;
  font-size: 0.9rem;
  color: var(--text-secondary);
}

.footer-top {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 60px;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-brand {
  max-width: 300px;
}

.footer-logo {
  margin-bottom: 16px;
}

.footer-brand-desc {
  margin-bottom: 20px;
}

.footer-links-group {
  display: flex;
  gap: 80px;
}

.footer-links-col h4 {
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer-links-col ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.05);
  padding-top: 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
}

@media (max-width: 768px) {
  .footer-top {
    flex-direction: column;
  }
  .footer-links-group {
    width: 100%;
    justify-content: space-between;
    gap: 20px;
  }
}

@media (max-width: 480px) {
  .footer-links-group {
    flex-direction: column;
    gap: 30px;
  }
}