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

/* ===== Variables ===== */
:root {
  --color-primary: #1E3A5F;
  --color-primary-dark: #142840;
  --color-accent: #3D8AB9;
  --color-accent-warm: #D4943F;
  --color-text: #252B33;
  --color-text-secondary: #556270;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F4F6F9;
  --color-border: #D6DCE4;
  --font-family: 'Inter', system-ui, -apple-system, sans-serif;
  --max-width: 1140px;
  --radius: 6px;
  --cable-color: rgba(61, 138, 185, 0.3);
  --cable-glow: rgba(61, 138, 185, 0.8);
}

/* ===== Base ===== */
html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.7;
  color: var(--color-text);
  background: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  text-decoration: underline;
}

/* Focus styles */
:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

/* Screen reader only */
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== Container ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Section ===== */
.section {
  padding: 80px 0;
}

.section--alt {
  background: var(--color-bg-alt);
}

.section--navy {
  background: var(--color-primary);
  color: #FFFFFF;
}

.section--dark {
  background: var(--color-primary-dark);
  color: #FFFFFF;
}

.section-eyebrow {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--color-accent);
  margin-bottom: 12px;
}

.section--navy .section-eyebrow {
  color: rgba(255, 255, 255, 0.7);
}

.section-title {
  font-size: 36px;
  font-weight: 700;
  color: var(--color-primary);
  margin-bottom: 16px;
  line-height: 1.2;
}

.section--navy .section-title,
.section--dark .section-title {
  color: #FFFFFF;
}

.section-subtitle {
  font-size: 18px;
  color: var(--color-text-secondary);
  max-width: 640px;
  margin-bottom: 48px;
}

.section--navy .section-subtitle {
  color: rgba(255, 255, 255, 0.8);
}

.section-header {
  text-align: center;
  margin-bottom: 48px;
}

.section-header .section-title {
  margin-bottom: 16px;
}

.section-header .section-subtitle {
  margin: 0 auto;
}

/* ===== Painting Placeholders ===== */
.painting {
  max-width: 800px;
  margin: 0 auto 40px;
  aspect-ratio: 16 / 9;
  border-radius: 8px;
  overflow: hidden;
  position: relative;
  box-shadow:
    inset 0 0 0 1px rgba(0, 0, 0, 0.08),
    inset 0 2px 8px rgba(0, 0, 0, 0.12),
    0 2px 8px rgba(0, 0, 0, 0.06);
}

.painting::after {
  content: '';
  position: absolute;
  inset: 0;
  opacity: 0.28;
  mix-blend-mode: overlay;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='100' height='100'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.75' numOctaves='4' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100' height='100' filter='url(%23n)' opacity='1'/%3E%3C/svg%3E");
  background-size: 100px 100px;
}

.painting img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: contrast(1.1) saturate(1.4) brightness(1.05);
}

.painting--warm {
  background: linear-gradient(135deg, #8B4513 0%, #A0522D 25%, #CD853F 50%, #D2B48C 75%, #C4956A 100%);
}

.painting--cool {
  background: linear-gradient(135deg, #2C3E6B 0%, #34607A 25%, #4A8B9E 50%, #6BADC4 75%, #3B6E8A 100%);
}

.painting--golden {
  background: linear-gradient(135deg, #B8860B 0%, #DAA520 25%, #E6BE5A 50%, #F0D77E 75%, #CCA23A 100%);
}

.painting-caption {
  text-align: center;
  font-size: 13px;
  font-style: italic;
  color: var(--color-text-secondary);
  margin-top: -28px;
  margin-bottom: 40px;
}

/* ===== Header / Navigation ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-border);
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  font-size: 22px;
  font-weight: 700;
  color: var(--color-primary);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.nav-logo:hover {
  text-decoration: none;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
  list-style: none;
}

.nav-links a {
  font-size: 14px;
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--color-text);
  text-decoration: none;
  transition: color 0.2s;
}

.nav-links a:hover {
  color: var(--color-accent);
  text-decoration: none;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  font-size: 15px;
  font-weight: 600;
  font-family: var(--font-family);
  border-radius: var(--radius);
  border: none;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  text-decoration: none;
}

.btn:hover {
  text-decoration: none;
}

.btn:active {
  transform: scale(0.98);
}

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

.nav-links .btn--primary {
  color: #FFFFFF;
}

.btn--primary:hover {
  background: #2E74A3;
}

.btn--white {
  background: #FFFFFF;
  color: var(--color-primary);
}

.btn--white:hover {
  background: #F0F0F0;
}

.btn--outline {
  background: transparent;
  color: #FFFFFF;
  border: 2px solid rgba(255, 255, 255, 0.4);
}

.btn--outline:hover {
  border-color: #FFFFFF;
  background: rgba(255, 255, 255, 0.1);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 8px;
  color: var(--color-text);
}

/* ===== Hero ===== */
.hero {
  padding: 96px 0 80px;
  text-align: center;
}

.hero .section-eyebrow {
  color: rgba(255, 255, 255, 0.7);
}

.hero-headline {
  font-size: 48px;
  font-weight: 700;
  line-height: 1.15;
  color: #FFFFFF;
  max-width: 740px;
  margin: 0 auto 20px;
}

.hero-subtitle {
  font-size: 18px;
  color: rgba(255, 255, 255, 0.8);
  max-width: 600px;
  margin: 0 auto 36px;
  line-height: 1.7;
}

.hero-cta {
  margin-bottom: 64px;
}

.hero-metrics {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 800px;
  margin: 0 auto;
}

.metric-card {
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: var(--radius);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease;
}

.metric-card:hover {
  transform: translateY(-4px);
  background: rgba(255, 255, 255, 0.14);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.metric-icon {
  font-size: 24px;
  line-height: 1;
}

.metric-icon--green {
  color: #4EC9A0;
}

.metric-icon--blue {
  color: #5AAED6;
}

.metric-icon--amber {
  color: #D4943F;
}

.metric-headline {
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  line-height: 1.35;
}

/* ===== Hero Image Section ===== */
.hero-image-section {
  padding: 40px 0;
}

.hero-image {
  max-width: 1000px;
  border-radius: 0;
}

/* ===== Problem Section ===== */
.problem-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  margin-bottom: 48px;
  background: var(--color-primary);
  border-radius: var(--radius);
  overflow: hidden;
  min-height: 400px;
}

.problem-cards {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 32px;
}

.problem-card {
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  border: none;
  border-left: 4px solid var(--color-accent-warm);
  border-radius: var(--radius);
  padding: 20px 24px;
  cursor: pointer;
}

.problem-card h3 {
  color: #FFFFFF;
}

.problem-card p {
  color: rgba(255, 255, 255, 0.8);
  display: none;
}

.problem-card.active p {
  display: block;
  margin-top: 8px;
}

.problem-card:hover {
  background: rgba(255, 255, 255, 0.18);
}

.problem-card.active {
  background: rgba(255, 255, 255, 0.18);
  border-left-color: #E9A948;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.15);
}

.problem-image-viewer {
  position: relative;
  overflow: hidden;
}

.problem-image-viewer .painting {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  margin: 0;
  border-radius: 0;
  aspect-ratio: auto;
  object-fit: cover;
  object-position: right center;
  box-shadow: none;
}

.problem-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: #FFFFFF;
  margin-bottom: 0;
}

.problem-card p {
  font-size: 15px;
  line-height: 1.6;
}

.problem-callout {
  text-align: center;
  font-size: 28px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 36px 40px;
  background: var(--color-bg-alt);
  border-radius: var(--radius);
}

/* ===== Solution Section ===== */
.solution-content {
  text-align: center;
}

.integration-strip {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 0;
}

.integration-item {
  display: flex;
  align-items: center;
  gap: 8px;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text);
}

.integration-item svg {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
}

.solution-callout {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  padding: 24px;
  background: var(--color-bg);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
  display: inline-block;
}

/* ===== Solution Pillars (rows) ===== */
.solution-pillars {
  margin-top: 48px;
  text-align: left;
}

.solution-pillar {
  display: flex;
  align-items: center;
  gap: 24px;
  padding: 28px 0;
  border-bottom: 1px solid var(--color-border);
}

.solution-pillar:first-child {
  border-top: 1px solid var(--color-border);
}

.solution-pillar-icon {
  width: 52px;
  height: 52px;
  min-width: 52px;
  background: var(--color-primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #FFFFFF;
}

.solution-pillar-icon svg {
  width: 24px;
  height: 24px;
}

.solution-pillar-text h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 4px;
}

.solution-pillar-text p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Energy Cables ===== */
.energy-cables {
  position: relative;
  height: 120px;
  margin: 0;
}

.energy-cables-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
}

.cable-base {
  fill: none;
  stroke: var(--cable-color);
  stroke-width: 2;
}

.cable-pulse {
  fill: none;
  stroke: var(--cable-glow);
  stroke-width: 2;
  stroke-dasharray: 12 24;
  filter: url(#cable-glow);
  animation: cable-flow 2s linear infinite;
}

@keyframes cable-flow {
  to {
    stroke-dashoffset: -72;
  }
}

/* Stagger delays */
.cable-pulse[data-index="0"] { animation-delay: 0s; }
.cable-pulse[data-index="1"] { animation-delay: -0.4s; }
.cable-pulse[data-index="2"] { animation-delay: -0.8s; }
.cable-pulse[data-index="3"] { animation-delay: -1.2s; }
.cable-pulse[data-index="4"] { animation-delay: -1.6s; }

/* Paused state when off-screen */
.energy-cables.paused .cable-pulse {
  animation-play-state: paused;
}

@media (prefers-reduced-motion: reduce) {
  .cable-pulse {
    animation: none;
  }
}

@media (max-width: 1024px) {
  .energy-cables {
    height: 100px;
  }
}

@media (max-width: 768px) {
  .energy-cables {
    height: 80px;
  }
}

@media (max-width: 480px) {
  .energy-cables {
    display: none;
  }
}

/* ===== Features Section ===== */
.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  margin-bottom: 24px;
}

.feature-card {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px 28px;
}

.feature-card-icon {
  width: 44px;
  height: 44px;
  background: var(--color-primary);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
  color: #FFFFFF;
}

.feature-card-icon svg {
  width: 22px;
  height: 22px;
}

.feature-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Section Divider ===== */
.section-divider {
  line-height: 0;
  padding: 0 24px;
}

.section-divider svg {
  width: 100%;
  height: 48px;
}

/* ===== Why Work With Us ===== */
.why-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.why-card {
  text-align: center;
  padding: 16px;
}

.why-card-icon {
  width: 52px;
  height: 52px;
  background: var(--color-bg-alt);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
  color: var(--color-accent);
}

.why-card-icon svg {
  width: 24px;
  height: 24px;
}

.why-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 8px;
}

.why-card p {
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.6;
}

/* ===== Early Access CTA ===== */
.cta-section {
  text-align: center;
}

.cta-headline {
  font-size: 36px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 40px;
}

.early-access-form {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  justify-content: center;
  max-width: 700px;
  margin: 0 auto 32px;
}

.early-access-form input {
  flex: 1;
  min-width: 180px;
  padding: 14px 16px;
  font-size: 15px;
  font-family: var(--font-family);
  border: 1px solid rgba(255, 255, 255, 0.3);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.1);
  color: #FFFFFF;
  outline: none;
  transition: border-color 0.2s;
}

.early-access-form input::placeholder {
  color: rgba(255, 255, 255, 0.5);
}

.early-access-form input:focus {
  border-color: #FFFFFF;
  background: rgba(255, 255, 255, 0.15);
}

.early-access-form button {
  min-width: 180px;
}

.cta-tagline {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 760px;
  margin: 0 auto;
}

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

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

.faq-question {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 20px 0;
  font-size: 16px;
  font-weight: 600;
  font-family: var(--font-family);
  color: var(--color-primary);
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  gap: 16px;
}

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

.faq-chevron {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
  transition: transform 0.3s ease;
  color: var(--color-text-secondary);
}

.faq-question[aria-expanded="true"] .faq-chevron {
  transform: rotate(180deg);
}

.faq-answer {
  padding: 0 0 20px;
  font-size: 15px;
  color: var(--color-text-secondary);
  line-height: 1.7;
}

/* ===== Footer ===== */
.site-footer {
  background: var(--color-primary-dark);
  color: rgba(255, 255, 255, 0.7);
  padding: 48px 0;
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 700;
  color: #FFFFFF;
}

.footer-tagline {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

.footer-links {
  display: flex;
  gap: 28px;
  list-style: none;
}

.footer-links a {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.6);
  text-decoration: none;
  transition: color 0.2s;
}

.footer-links a:hover {
  color: #FFFFFF;
  text-decoration: none;
}

.footer-copyright {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.4);
  width: 100%;
  text-align: center;
  margin-top: 24px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  .hero-headline {
    font-size: 40px;
  }

  .section-title {
    font-size: 30px;
  }

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

}

@media (max-width: 768px) {
  .painting {
    max-width: 100%;
    margin-bottom: 32px;
  }

  .painting-caption {
    margin-top: -20px;
    margin-bottom: 32px;
  }

  .section {
    padding: 48px 0;
  }

  .hero {
    padding: 64px 0 48px;
  }

  .hero-headline {
    font-size: 32px;
  }

  .hero-metrics {
    grid-template-columns: 1fr;
    max-width: 360px;
  }

  .metric-headline {
    font-size: 16px;
  }

  .problem-layout {
    grid-template-columns: 1fr;
  }

  .problem-image-viewer {
    min-height: 250px;
  }

  .why-cards {
    grid-template-columns: 1fr;
    gap: 24px;
  }

  .section-title {
    font-size: 26px;
  }

  .cta-headline {
    font-size: 28px;
  }

  .early-access-form {
    flex-direction: column;
  }

  .early-access-form input {
    min-width: 100%;
  }

  .early-access-form button {
    min-width: 100%;
  }

  /* Mobile menu */
  .menu-toggle {
    display: block;
  }

  .nav-links {
    display: none;
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    background: var(--color-bg);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links .btn {
    width: 100%;
    text-align: center;
  }

  .footer-inner {
    flex-direction: column;
    text-align: center;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}