/* LIXA Premium Dark Design System */

/* ============================================
   FOUNDATIONS
   ============================================ */

:root {
  /* Colors - Premium Dark */
  --black: #0a0a0a;
  --black-2: #0f0f0f;
  --black-3: #141414;
  --black-4: #1a1a1a;
  --border: #1f1f1f;
  --border-2: #2a2a2a;
  --white: #ffffff;
  --white-2: #ededed;
  --white-3: #d4d4d4;
  --gray: #a1a1a1;
  --gray-2: #6f6f6f;
  --gray-3: #4a4a4a;
  
  /* Semantic Colors */
  --success: #22c55e;
  --success-glow: rgba(34,197,94,0.15);
  --warning: #fbbf24;
  --warning-glow: rgba(251,191,36,0.15);
  --error: #ef4444;
  --error-glow: rgba(239,68,68,0.15);
  --info: #60a5fa;
  
  /* Typography */
  --font-serif: 'Spectral', serif;
  --font-sans: 'Inter', sans-serif;
  
  /* Spacing */
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
  --space-7: 32px;
  --space-8: 40px;
  --space-9: 48px;
  --space-10: 64px;
  --space-11: 80px;
  --space-12: 120px;
  
  /* Layout */
  --max-width: 1280px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --radius-full: 100px;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.2);
  
  /* Transitions */
  --transition: 0.2s cubic-bezier(0.4,0,0.2,1);
}

/* ============================================
   RESET & BASE
   ============================================ */

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

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

body {
  font-family: var(--font-sans);
  background:
    radial-gradient(circle at 15% 20%, rgba(255,255,255,0.05), transparent 32%),
    radial-gradient(circle at 82% 10%, rgba(218,224,232,0.08), transparent 30%),
    linear-gradient(180deg, #111214 0%, #0b0b0c 100%);
  color: var(--white-2);
  font-size: 15px;
  line-height: 1.6;
  overflow-x: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  opacity: 0.16;
  background-image:
    radial-gradient(rgba(255,255,255,0.40) 0.6px, transparent 0.7px),
    radial-gradient(rgba(255,255,255,0.22) 0.4px, transparent 0.5px);
  background-size: 4px 4px, 7px 7px;
  background-position: 0 0, 1px 1px;
  mix-blend-mode: soft-light;
}

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

button, input, select, textarea {
  font: inherit;
}

::selection {
  background: var(--white);
  color: var(--black);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-serif);
  font-weight: 500;
  letter-spacing: -0.02em;
  line-height: 1.1;
  color: var(--white);
}

h1 {
  font-size: clamp(48px, 8vw, 84px);
  margin-bottom: var(--space-6);
}

h2 {
  font-size: clamp(36px, 6vw, 56px);
  margin-bottom: var(--space-5);
}

h3 {
  font-size: clamp(24px, 4vw, 36px);
  margin-bottom: var(--space-4);
}

h4 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-3);
}

p {
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: var(--space-4);
}

.label {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--gray-2);
  margin-bottom: var(--space-3);
  font-weight: 600;
}

/* ============================================
   LAYOUT
   ============================================ */

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--space-7);
}

.section {
  padding: var(--space-12) 0;
}

.section-dark {
  background: var(--black-2);
}

.section-header-center {
  text-align: center;
  max-width: 700px;
  margin: 0 auto var(--space-10);
}

.section-header-center h2 {
  margin-bottom: var(--space-4);
}

.section-header-center p {
  font-size: 18px;
  color: var(--gray);
}

.section-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-11);
  align-items: center;
}

.section-grid-reverse {
  direction: rtl;
}

.section-grid-reverse > * {
  direction: ltr;
}

.section-content h2 {
  margin-top: var(--space-3);
  margin-bottom: var(--space-4);
}

.section-content p {
  font-size: 17px;
  line-height: 1.7;
}

/* ============================================
   NAVIGATION
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10,10,10,0.8);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.nav-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-5) 0;
}

.logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--white);
}

.logo-icon {
  width: 22px;
  height: 22px;
  display: block;
  flex: 0 0 22px;
}

.logo-word {
  font-size: 14px;
  letter-spacing: 0.28em;
  line-height: 1;
}

.nav-links {
  display: flex;
  gap: var(--space-7);
  align-items: center;
}

.nav-link {
  color: var(--gray);
  font-size: 14px;
  font-weight: 500;
  transition: color var(--transition);
}

.nav-link:hover {
  color: var(--white);
}

/* ============================================
   BUTTONS
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 20px;
  border-radius: var(--radius-full);
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  transition: transform var(--transition), color var(--transition), background var(--transition), border-color var(--transition);
  border: 1px solid rgba(255,255,255,0.10);
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  position: relative;
  overflow: hidden;
}

.btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(115deg, transparent 12%, rgba(255,255,255,0.05) 22%, rgba(255,255,255,0.9) 50%, rgba(255,255,255,0.05) 78%, transparent 88%);
  transform: translateX(-145%);
  opacity: 0;
  transition: transform 0.7s cubic-bezier(0.22,1,0.36,1), opacity 0.25s ease;
  -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
  -webkit-mask-composite: xor;
  mask-composite: exclude;
  pointer-events: none;
}

.btn:hover::before {
  opacity: 1;
  transform: translateX(145%);
}

.btn-primary {
  background: linear-gradient(180deg, rgba(248,249,251,0.14), rgba(200,205,212,0.06));
  color: var(--white);
  border-color: rgba(255,255,255,0.14);
}

.btn-primary:hover {
  transform: translateY(-1px);
  background: linear-gradient(180deg, rgba(248,249,251,0.16), rgba(200,205,212,0.08));
}

.btn-secondary {
  background: rgba(255,255,255,0.02);
  color: var(--white);
  border: 1px solid rgba(255,255,255,0.10);
}

.btn-secondary:hover {
  background: rgba(255,255,255,0.035);
}

.btn-sm {
  padding: 8px 16px;
  font-size: 13px;
}

.btn-lg {
  padding: 14px 28px;
  font-size: 15px;
}

.btn-block {
  width: 100%;
}

/* ============================================
   HERO
   ============================================ */

.hero {
  padding: calc(var(--space-12) + 80px) 0 var(--space-12);
  text-align: center;
}

.hero-content {
  max-width: 900px;
  margin: 0 auto;
}

.hero-title {
  background: linear-gradient(180deg, var(--white) 0%, var(--gray) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  margin-bottom: var(--space-6);
}

.hero-subtitle {
  font-size: 20px;
  color: var(--gray);
  line-height: 1.6;
  margin-bottom: var(--space-7);
  max-width: 650px;
  margin-left: auto;
  margin-right: auto;
}

.hero-cta {
  display: flex;
  gap: var(--space-3);
  justify-content: center;
  align-items: center;
  margin-bottom: var(--space-10);
}

.hero-stats {
  display: flex;
  justify-content: center;
  gap: var(--space-10);
  padding-top: var(--space-10);
  border-top: 1px solid var(--border);
  max-width: 600px;
  margin: 0 auto;
}

.stat {
  text-align: center;
}

.stat-value {
  font-family: var(--font-serif);
  font-size: 36px;
  font-weight: 500;
  color: var(--white);
  margin-bottom: var(--space-2);
}

.stat-label {
  font-size: 13px;
  color: var(--gray-2);
}

/* ============================================
   CARDS
   ============================================ */

.card-highlight {
  background: var(--black-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-7);
  transition: border-color var(--transition);
}

.card-highlight:hover {
  border-color: var(--border-2);
}

.card-highlight-header {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-6);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray);
}

.icon-badge {
  width: 40px;
  height: 40px;
  background: var(--black-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
}

.icon-badge.success {
  background: var(--success-glow);
  border-color: var(--success);
  color: var(--success);
}

.problem-list,
.solution-list {
  list-style: none;
}

.problem-list li,
.solution-list li {
  padding: var(--space-3) 0;
  color: var(--gray);
  border-bottom: 1px solid var(--border);
}

.problem-list li:last-child,
.solution-list li:last-child {
  border-bottom: none;
}

/* ============================================
   FEATURES
   ============================================ */

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: var(--space-6);
}

.feature-card {
  background: var(--black-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
  transition: all var(--transition);
}

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

.feature-icon {
  width: 48px;
  height: 48px;
  background: var(--black-4);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  margin-bottom: var(--space-5);
}

.feature-card h3 {
  font-family: var(--font-sans);
  font-size: 18px;
  font-weight: 600;
  margin-bottom: var(--space-3);
  color: var(--white);
}

.feature-card p {
  color: var(--gray);
  line-height: 1.7;
  margin: 0;
}

/* ============================================
   PLATFORM PREVIEW
   ============================================ */

.platform-preview {
  max-width: 1000px;
  margin: 0 auto;
}

.browser-mockup {
  background: var(--black-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}

.browser-header {
  background: var(--black-4);
  border-bottom: 1px solid var(--border);
  padding: var(--space-4) var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.browser-dots {
  display: flex;
  gap: var(--space-2);
}

.browser-dots span {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--border-2);
}

.browser-url {
  flex: 1;
  background: var(--black);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: 13px;
  color: var(--gray-2);
}

.browser-content {
  padding: var(--space-8);
}

.audit-demo {
  max-width: 600px;
  margin: 0 auto;
}

.audit-input-group {
  display: flex;
  gap: var(--space-3);
  margin-bottom: var(--space-7);
}

.audit-input {
  flex: 1;
  padding: 12px 16px;
  background: var(--black);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--white);
  font-size: 14px;
}

.audit-results-preview {
  display: flex;
  gap: var(--space-7);
  align-items: flex-start;
}

.audit-score {
  text-align: center;
}

.score-circle {
  width: 100px;
  height: 100px;
  border-radius: 50%;
  background: var(--warning-glow);
  border: 2px solid var(--warning);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  font-weight: 600;
  color: var(--warning);
  margin-bottom: var(--space-3);
}

.score-label {
  font-size: 12px;
  color: var(--gray-2);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.audit-issues-preview {
  flex: 1;
}

.issue-item {
  padding: var(--space-3) var(--space-4);
  background: var(--black);
  border-left: 2px solid;
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-size: 13px;
}

.issue-item.critical {
  border-color: var(--error);
  background: var(--error-glow);
}

.issue-item.high {
  border-color: var(--warning);
  background: var(--warning-glow);
}

.issue-item.medium {
  border-color: var(--info);
  background: rgba(96,165,250,0.08);
}

.issue-badge {
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-2);
}

/* ============================================
   USE CASES
   ============================================ */

.use-case-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: var(--space-6);
}

.use-case-card {
  background: var(--black-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-7);
}

.use-case-card h3 {
  font-family: var(--font-sans);
  font-size: 20px;
  font-weight: 600;
  margin-bottom: var(--space-4);
}

.use-case-card p {
  color: var(--gray);
  line-height: 1.7;
  margin-bottom: var(--space-5);
}

.use-case-metric {
  padding-top: var(--space-5);
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.metric-value {
  font-family: var(--font-serif);
  font-size: 32px;
  font-weight: 500;
  color: var(--white);
}

.metric-label {
  font-size: 13px;
  color: var(--gray-2);
}

/* ============================================
   PRICING PREVIEW
   ============================================ */

.pricing-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--space-6);
  max-width: 1100px;
  margin: 0 auto;
}

.pricing-preview-card {
  background: var(--black-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: var(--space-8) var(--space-7);
  position: relative;
  transition: all var(--transition);
}

.pricing-preview-card:hover {
  border-color: var(--border-2);
  transform: translateY(-4px);
}

.pricing-preview-card.featured {
  border-color: var(--white);
  transform: scale(1.02);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--white);
  color: var(--black);
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 12px;
  border-radius: var(--radius-full);
}

.pricing-tier {
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--gray-2);
  margin-bottom: var(--space-3);
}

.pricing-price {
  font-family: var(--font-serif);
  font-size: 48px;
  font-weight: 500;
  color: var(--white);
  margin-bottom: var(--space-5);
}

.pricing-price span {
  font-size: 18px;
  color: var(--gray);
}

.pricing-features-preview {
  list-style: none;
  margin-bottom: var(--space-7);
}

.pricing-features-preview li {
  padding: var(--space-3) 0;
  color: var(--gray);
  font-size: 14px;
}

.pricing-cta-note {
  text-align: center;
  margin-top: var(--space-7);
}

.pricing-cta-note a {
  color: var(--white);
  font-weight: 500;
  transition: color var(--transition);
}

.pricing-cta-note a:hover {
  color: var(--gray);
}

/* ============================================
   CTA SECTION
   ============================================ */

.cta-section {
  padding: var(--space-12) 0;
}

.cta-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.cta-content h2 {
  margin-bottom: var(--space-5);
}

.cta-content p {
  font-size: 18px;
  color: var(--gray);
  margin-bottom: var(--space-7);
}

.cta-note {
  margin-top: var(--space-4);
  font-size: 13px;
  color: var(--gray-2);
}

/* ============================================
   FOOTER
   ============================================ */

.footer {
  border-top: 1px solid var(--border);
  padding: var(--space-11) 0 var(--space-7);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr repeat(3, 1fr);
  gap: var(--space-10);
  margin-bottom: var(--space-9);
}

.footer-brand p {
  color: var(--gray-2);
  margin-top: var(--space-3);
}

.footer-col h4 {
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-4);
  color: var(--white);
}

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

.footer-col li {
  margin-bottom: var(--space-3);
}

.footer-col a {
  color: var(--gray);
  font-size: 14px;
  transition: color var(--transition);
}

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

.footer-bottom {
  padding-top: var(--space-7);
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--gray-2);
  font-size: 13px;
}

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

@media (max-width: 968px) {
  .section-grid {
    grid-template-columns: 1fr;
    gap: var(--space-8);
  }
  
  .section-grid-reverse {
    direction: ltr;
  }
  
  .hero-cta {
    flex-direction: column;
  }
  
  .hero-stats {
    gap: var(--space-6);
  }
  
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-8);
  }
  
  .pricing-preview-grid {
    grid-template-columns: 1fr;
  }
  
  .audit-results-preview {
    flex-direction: column;
  }
}

@media (max-width: 640px) {
  .container {
    padding: 0 var(--space-5);
  }
  
  .nav-links {
    gap: var(--space-4);
  }
  
  .nav-link:not(.btn) {
    display: none;
  }
  
  .hero {
    padding: calc(var(--space-10) + 80px) 0 var(--space-10);
  }
  
  .hero-stats {
    flex-direction: column;
    gap: var(--space-6);
  }
  
  .section {
    padding: var(--space-10) 0;
  }
  
  .footer-grid {
    grid-template-columns: 1fr;
  }
  
  .feature-grid,
  .use-case-grid {
    grid-template-columns: 1fr;
  }
}