/* ==========================================================================
   SterlingIQX. Global Design System & Layout Engine
   Palette: #080a0f | #11141d | #e6e9ef | #00e5a0 | #1e293b
   ========================================================================== */

/* ------------------- 1. Reset & Root Variables ------------------- */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

:root {
  --bg: #080a0f;
  --surface: #11141d;
  --ink: #e6e9ef;
  --ink-muted: #8b949e;
  --accent: #00e5a0;
  --accent-glow: rgba(0, 229, 160, 0.18);
  --secondary: #1e293b;
  --danger: #ff4d4d;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.6);
  --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.7);
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 9999px;
  --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, 'SFMono-Regular', Consolas, monospace;
  --transition-fast: 0.2s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-med: 0.4s cubic-bezier(0.25, 1, 0.5, 1);
  --transition-slow: 0.6s cubic-bezier(0.16, 1, 0.3, 1);
  --container-max: 1240px;
  --header-height: 72px;
}

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

body {
  font-family: var(--font-sans);
  background-color: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  overflow-x: hidden;
  min-height: 100vh;
  position: relative;
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1rem;
}

h1 { font-size: clamp(2.5rem, 5vw, 4.5rem); }
h2 { font-size: clamp(2rem, 4vw, 3rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
p { margin-bottom: 1.5rem; max-width: 65ch; }

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

a:hover {
  color: #00ffb8;
}

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

button, input, textarea {
  font-family: inherit;
  font-size: 1rem;
  line-height: 1.5;
}

ul, ol {
  list-style: none;
}

/* ------------------- 2. Layout & Header ------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.site-header {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  height: var(--header-height);
  background: rgba(17, 20, 29, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--secondary);
  z-index: 100;
  display: flex;
  align-items: center;
  transition: box-shadow var(--transition-fast);
}

.brand-logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
  padding: 0 16px;
  display: flex;
  align-items: center;
}

#menu-toggle {
  display: none;
  background: transparent;
  border: 1px solid var(--secondary);
  color: var(--ink);
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-left: auto;
  font-size: 1.2rem;
}

#main-nav {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-left: 32px;
}

.main-nav a {
  color: var(--ink-muted);
  font-size: 0.95rem;
  font-weight: 500;
  padding: 8px 0;
  position: relative;
}

.main-nav a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width var(--transition-fast);
}

.main-nav a:hover,
.main-nav a:focus {
  color: var(--ink);
}

.main-nav a:hover::after,
.main-nav a:focus::after {
  width: 100%;
}

#scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  width: 0%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), #00ffb8);
  z-index: 101;
  transition: width 0.1s linear;
}

/* ------------------- 3. Hero & Visual Core ------------------- */
.site-landing {
  background: var(--bg);
}

.hero-section {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  padding: calc(var(--header-height) + 40px) 0 80px;
  overflow: hidden;
}

.hero-visual {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 600px;
  height: 600px;
  transform: translate(-50%, -50%);
  z-index: 1;
  opacity: 0.6;
  pointer-events: none;
  transition: transform var(--transition-med), opacity var(--transition-med);
}

.hero-visual svg {
  width: 100%;
  height: 100%;
  filter: drop-shadow(0 0 20px var(--accent-glow));
}

@keyframes pulse-oval {
  0%, 100% { transform: scale(1); opacity: 0.6; }
  50% { transform: scale(1.04); opacity: 0.8; }
}

.hero-visual > svg > circle:first-child {
  animation: pulse-oval 6s ease-in-out infinite;
  transform-origin: 50% 50%;
}

.hero-visual > svg > path.threads {
  stroke-dasharray: 8 12;
  opacity: 0.4;
  transition: stroke-dashoffset 1s ease, opacity 0.6s ease;
}

.hero-section.scrolled .threads {
  stroke-dashoffset: 200;
  opacity: 0.1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 680px;
  padding: 0 24px;
  text-align: center;
}

.hero-subtitle {
  font-size: 1.1rem;
  color: var(--ink-muted);
  margin-bottom: 2rem;
  line-height: 1.7;
}

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

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 28px;
  font-weight: 600;
  font-size: 1rem;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  border: 2px solid transparent;
  user-select: none;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg);
  box-shadow: 0 4px 12px var(--accent-glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #00ffb8;
  transform: translateY(-2px);
  box-shadow: 0 6px 16px rgba(0, 229, 160, 0.25);
}

.btn-secondary {
  background: transparent;
  color: var(--accent);
  border-color: var(--accent);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: rgba(0, 229, 160, 0.08);
  transform: translateY(-2px);
}

.btn-small {
  padding: 8px 16px;
  font-size: 0.875rem;
  border-radius: var(--radius-sm);
}

/* ------------------- 4. Rhythm Line & Stats ------------------- */
.rhythm-line {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--secondary), transparent);
  margin: 60px 0;
  position: relative;
  opacity: 0.4;
}

.rhythm-line::after {
  content: '';
  position: absolute;
  top: -3px;
  left: 50%;
  width: 7px;
  height: 7px;
  background: var(--accent);
  border-radius: 50%;
  transform: translateX(-50%);
  box-shadow: 0 0 10px var(--accent);
}

.stats-section {
  padding: 80px 0;
  background: var(--surface);
  border-top: 1px solid var(--secondary);
  border-bottom: 1px solid var(--secondary);
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.stat-item {
  padding: 24px;
}

.stat-number {
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.03em;
  margin-bottom: 8px;
  font-variant-numeric: tabular-nums;
}

/* ------------------- 5. Sections: About, Process, Features ------------------- */
#about, #process, #features, #benefits {
  padding: 100px 0;
}

.about-section {
  display: flex;
  align-items: flex-start;
  gap: 60px;
}

.content-visual {
  flex: 1;
  position: relative;
  min-height: 400px;
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.05), rgba(30, 41, 59, 0.2));
  border: 1px solid var(--secondary);
  border-radius: var(--radius-lg);
  padding: 40px;
  overflow: hidden;
}

.timeline-track {
  position: absolute;
  left: 40px;
  top: 40px;
  bottom: 40px;
  width: 4px;
  background: var(--secondary);
  border-radius: 2px;
}

.timeline-marker {
  position: absolute;
  left: 32px;
  width: 20px;
  height: 20px;
  background: var(--bg);
  border: 2px solid var(--secondary);
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--transition-fast);
  z-index: 2;
}

.timeline-marker.active {
  background: var(--accent);
  border-color: var(--accent);
  box-shadow: 0 0 12px var(--accent-glow);
  transform: scale(1.2);
}

.timeline-marker[data-step="1"] { top: 40px; }
.timeline-marker[data-step="2"] { top: 140px; }
.timeline-marker[data-step="3"] { top: 240px; }
.timeline-marker[data-step="4"] { top: 340px; }

.about-text {
  flex: 1;
  padding-top: 20px;
}

.process-section {
  background: var(--surface);
}

.steps-grid, .cards-grid, .testimonials-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
  margin-top: 40px;
}

.step-card, .feature-card, .testimonial-card, .benefit-card {
  background: rgba(255, 255, 255, 0.02);
  border: 1px solid var(--secondary);
  border-radius: var(--radius-md);
  padding: 32px;
  transition: all var(--transition-med);
  position: relative;
  overflow: hidden;
}

.step-card:hover, .feature-card:hover, .testimonial-card:hover, .benefit-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow-md), 0 0 0 1px var(--accent-glow);
}

.step-icon, .card-icon {
  width: 48px;
  height: 48px;
  color: var(--accent);
  margin-bottom: 20px;
  background: rgba(0, 229, 160, 0.08);
  border-radius: var(--radius-sm);
  padding: 10px;
}

/* ------------------- 6. Benefits & Testimonials ------------------- */
#benefits {
  background: linear-gradient(180deg, var(--bg) 0%, #0c0e14 100%);
}

.benefit-card {
  background: linear-gradient(145deg, rgba(0, 229, 160, 0.03), transparent);
}

.testimonials-section {
  background: var(--surface);
  padding: 100px 0;
}

.stars {
  color: var(--accent);
  font-size: 1.2rem;
  margin-bottom: 16px;
  letter-spacing: 4px;
}

.testimonial-card p {
  font-style: italic;
  color: var(--ink);
  font-size: 1.1rem;
  line-height: 1.7;
}

.testimonial-card cite {
  display: block;
  margin-top: 16px;
  font-style: normal;
  font-size: 0.9rem;
  color: var(--ink-muted);
  font-weight: 500;
}

/* ------------------- 7. FAQ ------------------- */
.faq-section {
  padding: 100px 0;
  max-width: 800px;
  margin: 0 auto;
}

.faq-list {
  margin-top: 40px;
}

.faq-item {
  border-bottom: 1px solid var(--secondary);
  padding: 24px 0;
}

.faq-question {
  width: 100%;
  background: transparent;
  border: none;
  color: var(--ink);
  font-size: 1.125rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0;
  transition: color var(--transition-fast);
}

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

.faq-question::after {
  content: '+';
  font-size: 1.5rem;
  color: var(--accent);
  transition: transform var(--transition-fast);
}

.faq-item.active .faq-question::after {
  content: '−';
  transform: rotate(180deg);
}

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

.faq-item.active .faq-answer {
  max-height: 400px;
  opacity: 1;
  padding-bottom: 16px;
}

.faq-answer p {
  color: var(--ink-muted);
  font-size: 0.95rem;
  line-height: 1.65;
}

/* ------------------- 8. Contact & Forms ------------------- */
.contact-section {
  background: var(--surface);
  padding: 100px 0;
}

.contact-form {
  display: grid;
  gap: 24px;
  max-width: 640px;
}

.form-field {
  position: relative;
}

.form-field input,
.form-field textarea {
  width: 100%;
  background: transparent;
  border: 1px solid var(--secondary);
  border-radius: var(--radius-sm);
  padding: 16px;
  color: var(--ink);
  transition: all var(--transition-fast);
}

.form-field input:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.field-error {
  color: var(--danger);
  font-size: 0.85rem;
  margin-top: 6px;
  min-height: 1.2em;
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.form-field.invalid .field-error {
  opacity: 1;
}

.cta-banner {
  background: linear-gradient(135deg, var(--accent), #00b87c);
  color: var(--bg);
  padding: 60px 40px;
  text-align: center;
  border-radius: var(--radius-lg);
  margin-top: 80px;
}

.cta-banner h2 {
  color: var(--bg);
  margin-bottom: 1.5rem;
}

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

.cta-banner .btn-primary:hover {
  background: #1a1d26;
  color: #00ffb8;
}

/* ------------------- 9. Footer ------------------- */
.site-footer {
  background: var(--surface);
  padding: 80px 0 40px;
  border-top: 1px solid var(--secondary);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h4 {
  color: var(--ink);
  margin-bottom: 20px;
  font-size: 1rem;
}

.footer-col a {
  display: block;
  color: var(--ink-muted);
  margin-bottom: 12px;
  font-size: 0.9rem;
  transition: color var(--transition-fast);
}

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

.copyright-text {
  text-align: center;
  color: var(--ink-muted);
  font-size: 0.85rem;
  padding-top: 32px;
  border-top: 1px solid var(--secondary);
}

/* ------------------- 10. Cookie Banner ------------------- */
#cookie-banner.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  width: 100%;
  background: rgba(17, 20, 29, 0.95);
  backdrop-filter: blur(8px);
  border-top: 1px solid var(--secondary);
  padding: 20px 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 999;
  box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.5);
  gap: 20px;
}

.cookie-actions {
  display: flex;
  gap: 12px;
}

.cookie-banner.hidden {
  display: none;
}

/* ------------------- 11. Legal & Thank You Pages ------------------- */
.site-legal, .site-thankyou {
  background: var(--bg);
  min-height: 100vh;
}

.legal-page {
  padding: 100px 0 60px;
  max-width: 900px;
  margin: 0 auto;
}

.breadcrumb {
  font-size: 0.85rem;
  color: var(--ink-muted);
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.separator {
  color: var(--secondary);
}

.effective-date {
  font-size: 0.9rem;
  color: var(--accent);
  margin-bottom: 32px;
  font-weight: 500;
}

.legal-section {
  margin-bottom: 40px;
}

.cookie-table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 0.9rem;
}

.cookie-table th,
.cookie-table td {
  padding: 12px 16px;
  border: 1px solid var(--secondary);
  text-align: left;
}

.cookie-table th {
  background: rgba(0, 229, 160, 0.05);
  color: var(--accent);
  font-weight: 600;
}

.site-thankyou {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: calc(var(--header-height) + 60px) 24px 80px;
}

.thank-you-card {
  background: var(--surface);
  border: 1px solid var(--secondary);
  border-radius: var(--radius-lg);
  padding: 48px 40px;
  text-align: center;
  max-width: 600px;
  width: 100%;
  box-shadow: var(--shadow-lg);
}

.success-icon {
  width: 88px;
  height: 88px;
  margin: 0 auto 24px;
  color: var(--accent);
}

.success-icon svg {
  width: 100%;
  height: 100%;
}

/* ------------------- 12. Signature Interactions ------------------- */
.cursor-line {
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 50%;
  position: fixed;
  top: 0;
  left: 0;
  pointer-events: none;
  z-index: 9999;
  opacity: 0;
  mix-blend-mode: difference;
  transition: opacity 0.2s ease;
  will-change: transform;
}

body:hover .cursor-line {
  opacity: 0.8;
}

.btn.magnetic-active {
  transition: transform 0.3s cubic-bezier(0.25, 1, 0.5, 1);
  transform: scale(1.04);
}

.fade-up {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

.fade-up.visible,
.fade-up.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ------------------- 13. Utility & Layout Variants ------------------- */
.site-about {
  padding: 100px 0;
}

.about-hero {
  text-align: center;
  max-width: 800px;
  margin: 0 auto 60px;
}

.pill-badge {
  display: inline-block;
  background: rgba(0, 229, 160, 0.1);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: var(--radius-full);
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
  border: 1px solid rgba(0, 229, 160, 0.2);
}

.reversed-layout {
  flex-direction: row-reverse;
}

.philosophy-section, .values-section {
  padding: 80px 0;
  background: var(--surface);
}

.about-visual {
  background: linear-gradient(135deg, rgba(0, 229, 160, 0.05), transparent);
  border: 1px solid var(--secondary);
  border-radius: var(--radius-md);
  padding: 32px;
  margin-bottom: 32px;
}

#about-email {
  display: block;
  margin-top: 24px;
  font-weight: 600;
  color: var(--accent);
}

/* ------------------- 14. Accessibility & Motion ------------------- */
:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
  border-radius: 4px;
}

a:focus-visible,
button:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 4px;
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
  .cursor-line {
    display: none !important;
  }
  .fade-up {
    opacity: 1 !important;
    transform: none !important;
  }
}

/* ------------------- 15. Responsive Breakpoints ------------------- */
@media (max-width: 768px) {
  :root {
    --container-max: 100%;
  }

  #menu-toggle {
    display: block;
  }

  #main-nav {
    position: absolute;
    top: var(--header-height);
    left: 0;
    width: 100%;
    background: var(--surface);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--secondary);
    transform: translateY(-120%);
    transition: transform var(--transition-med);
    z-index: 99;
  }

  #main-nav.open {
    transform: translateY(0);
  }

  .hero-section {
    min-height: auto;
    padding: 120px 24px 60px;
  }

  .hero-visual {
    width: 320px;
    height: 320px;
    opacity: 0.4;
  }

  .hero-content {
    text-align: left;
    padding: 0;
  }

  .hero-actions {
    justify-content: flex-start;
  }

  .stats-section, #about, #process, #features, #benefits, .testimonials-section, .faq-section, .contact-section {
    padding: 60px 0;
  }

  .stat-grid, .steps-grid, .cards-grid, .testimonials-grid, .footer-grid {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .about-section {
    flex-direction: column;
    gap: 40px;
  }

  .content-visual {
    min-height: 300px;
  }

  .timeline-track {
    left: 20px;
  }

  .timeline-marker {
    left: 12px;
  }

  .cookie-banner {
    flex-direction: column;
    text-align: center;
    padding: 24px 16px;
  }

  .cookie-actions {
    width: 100%;
    justify-content: center;
  }

  .cta-banner {
    padding: 40px 20px;
  }

  h1 { font-size: 2.2rem; }
  h2 { font-size: 1.8rem; }
}