:root {
  --bg: #0a0d0b;
  --bg-elevated: #10140f;
  --surface: #151a14;
  --surface-hover: #1a201a;
  --border: #232a22;
  --text: #e9ede8;
  --text-muted: #8c968c;
  --text-faint: #5c665a;
  --accent-wa: #25d366;
  --accent-signal: #3ecf8e;
  --accent-warn: #e8b04b;

  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', monospace;
}

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

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; }
}

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

a { color: inherit; }

/* ---------- Hero ---------- */

.hero {
  position: relative;
  height: 100vh;
  min-height: 560px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  padding: 0 24px;
}

.scan-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 56px 56px;
  opacity: 0.35;
  mask-image: radial-gradient(ellipse at center, black 0%, transparent 72%);
  -webkit-mask-image: radial-gradient(ellipse at center, black 0%, transparent 72%);
}

.scan-beam {
  position: absolute;
  left: 0;
  right: 0;
  height: 140px;
  background: linear-gradient(to bottom, transparent, rgba(62, 207, 142, 0.10), transparent);
  animation: scan-sweep 7s linear infinite;
}

@keyframes scan-sweep {
  0% { transform: translateY(-140px); }
  100% { transform: translateY(100vh); }
}

.brand {
  position: absolute;
  top: 28px;
  left: 28px;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  z-index: 2;
}

.brand-dot { color: var(--accent-wa); }

.hero-content {
  position: relative;
  z-index: 2;
  max-width: 760px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.tagline {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 3.4rem);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--text);
}

.tagline .accent {
  display: block;
  color: var(--accent-signal);
}

.wa-btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: var(--accent-wa);
  color: #06170f;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  padding: 15px 28px;
  border-radius: 999px;
  border: none;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  box-shadow: 0 0 0 0 rgba(37, 211, 102, 0.4);
}

.wa-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(37, 211, 102, 0.28);
}

.wa-btn:focus-visible {
  outline: 2px solid var(--accent-signal);
  outline-offset: 3px;
}

.wa-icon { width: 20px; height: 20px; flex-shrink: 0; }

/* ---------- Sections ---------- */

.section {
  max-width: 920px;
  margin: 0 auto;
  padding: 96px 24px;
  border-top: 1px solid var(--border);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-signal);
  letter-spacing: 0.02em;
  margin-bottom: 14px;
}

.section-heading {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.4vw, 2.3rem);
  line-height: 1.25;
  max-width: 620px;
  margin-bottom: 20px;
}

.section-lead {
  color: var(--text-muted);
  font-size: 1.02rem;
  max-width: 620px;
}

/* symptom cards */

.symptom-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 44px;
}

.symptom-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  position: relative;
  overflow: hidden;
  transition: border-color 0.2s ease;
}

.symptom-card::before {
  content: '';
  position: absolute;
  top: 0; left: -100%;
  width: 100%; height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent-signal), transparent);
  transition: left 0.6s ease;
}

.symptom-card:hover { border-color: #2c352a; }
.symptom-card:hover::before { left: 100%; }

.symptom-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  margin-bottom: 14px;
}

.symptom-card h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  margin-bottom: 8px;
}

.symptom-card p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

/* loop */

.loop {
  display: flex;
  align-items: stretch;
  gap: 14px;
  margin-top: 48px;
  flex-wrap: wrap;
}

.loop-step {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px;
  flex: 1;
  min-width: 180px;
}

.loop-num {
  font-family: var(--font-mono);
  color: var(--accent-signal);
  font-size: 0.85rem;
}

.loop-step h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin: 10px 0 8px;
}

.loop-step p {
  color: var(--text-muted);
  font-size: 0.92rem;
}

.loop-arrow {
  align-self: center;
  color: var(--text-faint);
  font-size: 1.3rem;
  flex-shrink: 0;
}

.loop-arrow-return {
  width: 100%;
  order: 10;
  text-align: center;
  color: var(--accent-signal);
  margin-top: 4px;
}

.loop-note {
  margin-top: 24px;
  color: var(--text-faint);
  font-size: 0.88rem;
  font-family: var(--font-mono);
}

/* checklist */

.check-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px 32px;
  margin-top: 40px;
  max-width: 620px;
}

.check-list li {
  position: relative;
  padding-left: 28px;
  color: var(--text);
  font-size: 0.98rem;
}

.check-list li::before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--accent-signal);
  font-family: var(--font-mono);
}

/* accordion */

.accordion {
  margin-top: 40px;
  max-width: 680px;
  border-top: 1px solid var(--border);
}

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

.acc-trigger {
  width: 100%;
  background: none;
  border: none;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 500;
  text-align: left;
  padding: 20px 4px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  cursor: pointer;
}

.acc-trigger:focus-visible { outline: 2px solid var(--accent-signal); outline-offset: 2px; }

.acc-icon {
  font-family: var(--font-mono);
  color: var(--accent-signal);
  transition: transform 0.2s ease;
  flex-shrink: 0;
  margin-left: 16px;
}

.acc-trigger[aria-expanded="true"] .acc-icon { transform: rotate(45deg); }

.acc-panel {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}

.acc-panel p {
  color: var(--text-muted);
  font-size: 0.94rem;
  padding: 0 4px 20px;
  max-width: 560px;
}

/* contact section */

.contact-section {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.contact-section .section-heading,
.contact-section .section-lead { align-self: center; }

.contact-section .wa-btn { margin-top: 28px; }

/* ---------- Footer ---------- */

.site-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: 64px 24px 28px;
}

.footer-top, .footer-mid, .footer-bottom {
  max-width: 920px;
  margin: 0 auto;
}

.footer-brand {
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--text);
}

.footer-tagline {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-top: 8px;
  max-width: 360px;
}

.footer-mid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
  padding-bottom: 32px;
  border-bottom: 1px solid var(--border);
}

.footer-col { display: flex; flex-direction: column; gap: 8px; }

.footer-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-faint);
  margin-bottom: 4px;
}

.footer-col a, .footer-col span { color: var(--text-muted); font-size: 0.92rem; text-decoration: none; }
.footer-col a:hover { color: var(--accent-signal); }

.link-btn {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 0.92rem;
  font-family: var(--font-body);
  padding: 0;
  text-align: left;
  cursor: pointer;
}

.link-btn:hover { color: var(--accent-signal); }

.footer-bottom {
  margin-top: 24px;
  color: var(--text-faint);
  font-size: 0.8rem;
  font-family: var(--font-mono);
}

/* ---------- Modals ---------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.6);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  z-index: 40;
}

.modal-backdrop.active { opacity: 1; pointer-events: auto; }

.modal {
  position: fixed;
  top: 50%; left: 50%;
  transform: translate(-50%, -48%);
  width: min(520px, 88vw);
  max-height: 80vh;
  overflow-y: auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 32px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  z-index: 50;
}

.modal.active { opacity: 1; pointer-events: auto; transform: translate(-50%, -50%); }

.modal h3 {
  font-family: var(--font-display);
  margin-bottom: 18px;
  font-size: 1.3rem;
}

.modal p {
  color: var(--text-muted);
  font-size: 0.92rem;
  margin-bottom: 14px;
}

.modal-close {
  position: absolute;
  top: 18px; right: 18px;
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.4rem;
  cursor: pointer;
  line-height: 1;
}

.modal-close:hover { color: var(--text); }

/* ---------- Responsive ---------- */

@media (max-width: 720px) {
  .symptom-grid { grid-template-columns: 1fr; }
  .loop { flex-direction: column; }
  .loop-arrow { transform: rotate(90deg); align-self: center; }
  .check-list { grid-template-columns: 1fr; }
  .footer-mid { grid-template-columns: 1fr; }
  .section { padding: 72px 20px; }
}