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

:root {
  --bg: #0d0d14;
  --surface: #13131f;
  --surface2: #1a1a28;
  --text: #e8e0d5;
  --text-muted: #7a746e;
  --accent: #00d4aa;
  --accent-dim: rgba(0, 212, 170, 0.12);
  --border: rgba(255,255,255,0.07);
  --font-display: 'Syne', sans-serif;
  --font-body: 'DM Sans', sans-serif;
}

html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* === HEADER === */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(13, 13, 20, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  padding: 0 24px;
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.wordmark {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 700;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.5px;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.nav-badge {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  background: var(--accent-dim);
  padding: 4px 10px;
  border-radius: 4px;
  border: 1px solid rgba(0, 212, 170, 0.2);
}

/* === SECTION COMMON === */
section { padding: 96px 24px; }

.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 32px;
}

/* === HERO === */
.hero {
  padding: 96px 24px 80px;
  max-width: 1100px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 64px;
  align-items: center;
}

.hero-eyebrow {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 28px;
  font-weight: 400;
}

.eyebrow-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
  display: inline-block;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.4; }
}

.hero-headline {
  font-family: var(--font-display);
  font-size: clamp(40px, 6vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -2px;
  color: var(--text);
  margin-bottom: 24px;
}

.hero-sub {
  font-size: 18px;
  color: var(--text-muted);
  max-width: 520px;
  line-height: 1.65;
  margin-bottom: 48px;
  font-weight: 300;
}

.hero-stats {
  display: flex;
  align-items: center;
  gap: 0;
}

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

.stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -1px;
}

.stat-label {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.4;
  max-width: 120px;
}

.stat-divider {
  width: 1px;
  height: 48px;
  background: var(--border);
  margin: 0 32px;
}

/* === TWIN RING VISUAL === */
.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 220px;
  height: 220px;
  flex-shrink: 0;
}

.twin-ring {
  position: relative;
  width: 200px;
  height: 200px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.ring {
  position: absolute;
  border-radius: 50%;
  border: 1px solid;
}

.ring-1 {
  width: 200px;
  height: 200px;
  border-color: rgba(0, 212, 170, 0.15);
  animation: ring-pulse 3s ease-in-out infinite;
}

.ring-2 {
  width: 148px;
  height: 148px;
  border-color: rgba(0, 212, 170, 0.3);
  animation: ring-pulse 3s ease-in-out infinite 0.4s;
}

.ring-3 {
  width: 96px;
  height: 96px;
  border-color: rgba(0, 212, 170, 0.5);
  animation: ring-pulse 3s ease-in-out infinite 0.8s;
}

@keyframes ring-pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.04); opacity: 0.7; }
}

.twin-core {
  position: relative;
  z-index: 1;
  width: 64px;
  height: 64px;
  background: var(--surface2);
  border: 1px solid rgba(0, 212, 170, 0.4);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 24px rgba(0, 212, 170, 0.15), inset 0 0 16px rgba(0, 212, 170, 0.05);
}

.core-label {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  text-transform: uppercase;
}

/* === PROBLEM === */
.problem { background: var(--surface); border-top: 1px solid var(--border); border-bottom: 1px solid var(--border); }

.problem-inner { max-width: 1100px; margin: 0 auto; }

.problem-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2px;
}

.problem-card {
  background: var(--surface2);
  padding: 40px 36px;
  border: 1px solid var(--border);
}

.problem-icon {
  font-family: var(--font-display);
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
  color: var(--accent);
  margin-bottom: 20px;
  opacity: 0.7;
}

.problem-card h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 12px;
  letter-spacing: -0.3px;
}

.problem-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
  font-weight: 300;
}

/* === SOLUTION === */
.solution { background: var(--bg); }

.solution-inner { max-width: 1100px; margin: 0 auto; }

.solution-headline {
  font-family: var(--font-display);
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 800;
  letter-spacing: -1.5px;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.1;
}

.solution-body {
  font-size: 16px;
  color: var(--text-muted);
  max-width: 640px;
  line-height: 1.7;
  margin-bottom: 56px;
  font-weight: 300;
}

.feature-list {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--border);
}

.feature-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 28px 32px;
  border-bottom: 1px solid var(--border);
  border-right: 1px solid var(--border);
}

.feature-item:nth-child(2n) { border-right: none; }
.feature-item:nth-last-child(-n+2) { border-bottom: none; }

.feature-check {
  flex-shrink: 0;
  width: 32px;
  height: 32px;
  background: var(--accent-dim);
  border: 1px solid rgba(0, 212, 170, 0.2);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.feature-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.feature-text strong {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: -0.2px;
}

.feature-text span {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
  font-weight: 300;
}

/* === HOW === */
.how { background: var(--surface); border-top: 1px solid var(--border); }

.how-inner { max-width: 1100px; margin: 0 auto; }

.step-track {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: center;
  gap: 0;
}

.step {
  padding: 0 32px;
}

.step-number {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 800;
  color: var(--accent);
  opacity: 0.2;
  line-height: 1;
  margin-bottom: 16px;
  letter-spacing: -2px;
}

.step-body h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
  letter-spacing: -0.3px;
}

.step-body p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.65;
  font-weight: 300;
}

.step-connector {
  width: 48px;
  height: 1px;
  background: linear-gradient(to right, var(--border), var(--accent), var(--border));
  opacity: 0.5;
}

/* === PRINCIPLES === */
.principles { background: var(--bg); padding: 80px 24px; }

.principles-inner { max-width: 1100px; margin: 0 auto; }

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

.principle {
  background: var(--surface);
  padding: 48px 40px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.principle-mark {
  font-family: var(--font-display);
  font-size: 48px;
  line-height: 1;
  color: var(--accent);
  opacity: 0.4;
  font-weight: 800;
}

.principle blockquote {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  line-height: 1.5;
  letter-spacing: -0.3px;
}

/* === CLOSING === */
.closing { background: var(--surface); border-top: 1px solid var(--border); }

.closing-inner { max-width: 1100px; margin: 0 auto; text-align: center; }

.closing-headline {
  font-family: var(--font-display);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 800;
  letter-spacing: -2px;
  color: var(--text);
  margin-bottom: 20px;
  line-height: 1.1;
}

.closing-body {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 560px;
  margin: 0 auto 48px;
  line-height: 1.7;
  font-weight: 300;
}

.closing-statement {
  display: flex;
  flex-direction: column;
  gap: 8px;
  align-items: center;
}

.closing-statement span {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  color: var(--text-muted);
  letter-spacing: 0.5px;
}

.closing-statement span:last-child {
  color: var(--accent);
}

/* === FOOTER === */
footer { border-top: 1px solid var(--border); padding: 48px 24px; }

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  text-align: center;
}

.footer-wordmark {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  letter-spacing: -0.5px;
}

.footer-tagline {
  font-size: 13px;
  color: var(--text-muted);
  font-weight: 300;
}

.footer-links {
  font-size: 12px;
  color: var(--text-muted);
  opacity: 0.5;
  font-weight: 400;
  letter-spacing: 0.5px;
}

/* === RESPONSIVE === */
@media (max-width: 900px) {
  .hero {
    grid-template-columns: 1fr;
    gap: 48px;
    padding: 64px 24px 56px;
  }
  .hero-visual { width: 100%; height: 160px; }
  .twin-ring { margin: 0 auto; }
  .hero-stats { flex-wrap: wrap; gap: 24px; }
  .stat-divider { display: none; }
  .problem-grid { grid-template-columns: 1fr; }
  .feature-list { grid-template-columns: 1fr; }
  .feature-item { border-right: none; }
  .feature-item:nth-last-child(-n+2) { border-bottom: 1px solid var(--border); }
  .feature-item:last-child { border-bottom: none; }
  .principles-grid { grid-template-columns: 1fr; }
  .step-track { grid-template-columns: 1fr; gap: 32px; }
  .step-connector { display: none; }
}

@media (max-width: 480px) {
  section { padding: 64px 20px; }
  .hero-headline { font-size: 36px; letter-spacing: -1px; }
  .closing-headline { font-size: 28px; }
}