/* ============================================
   SITE 3 — HOW FLUX SIGNAL WORKS
   Theme: Dark + Electric Blue Accents
   Style: Educational / Step-Based
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@500;600;700;800&display=swap');

:root {
  --bg-primary: #070b14;
  --bg-secondary: #0c1220;
  --bg-card: #111a2e;
  --bg-card-hover: #162240;
  --surface: #0e1526;
  --border: rgba(96, 165, 250, 0.15);
  --border-subtle: rgba(255, 255, 255, 0.06);

  --text-primary: #f0f4f8;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;

  --accent: #60a5fa;
  --accent-hover: #93c5fd;
  --accent-glow: rgba(96, 165, 250, 0.12);
  --accent-dark: #2563eb;

  --success: #34d399;
  --warning: #fbbf24;
  --danger: #f87171;

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;

  --shadow-sm: 0 2px 8px rgba(0,0,0,0.3);
  --shadow-md: 0 4px 24px rgba(0,0,0,0.4);
  --shadow-glow: 0 0 40px rgba(96, 165, 250, 0.1);

  --font-body: 'Inter', -apple-system, sans-serif;
  --font-display: 'Outfit', -apple-system, sans-serif;

  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --max-width: 1200px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }

body {
  font-family: var(--font-body);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

.container { max-width: var(--max-width); margin: 0 auto; padding: 0 24px; }
.section { padding: 100px 0; position: relative; }
.section--alt { background: var(--bg-secondary); }

.section-label {
  font-size: 0.75rem; font-weight: 700; letter-spacing: 3px;
  text-transform: uppercase; color: var(--accent); margin-bottom: 16px; display: block;
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.8rem, 4vw, 2.8rem);
  font-weight: 800; line-height: 1.2; margin-bottom: 20px;
}

.section-subtitle {
  font-size: 1.1rem; color: var(--text-secondary); max-width: 640px; line-height: 1.8;
}

/* HEADER */
.site-header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(7, 11, 20, 0.88);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle); padding: 16px 0;
}

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

.nav__logo {
  font-family: var(--font-display); font-weight: 700; font-size: 1.1rem;
  color: var(--text-primary); display: flex; align-items: center; gap: 10px;
}

.nav__logo-icon {
  width: 34px; height: 34px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 1rem;
}

.nav__badge {
  font-size: 0.65rem; padding: 3px 8px;
  background: var(--accent-glow); color: var(--accent);
  border: 1px solid var(--border); border-radius: 20px;
  font-weight: 600; letter-spacing: 1px; text-transform: uppercase;
}

.nav__cta {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 10px 20px; background: var(--accent); color: var(--bg-primary);
  font-weight: 700; font-size: 0.85rem; border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav__cta:hover {
  background: var(--accent-hover); color: var(--bg-primary);
  transform: translateY(-1px); box-shadow: var(--shadow-glow);
}

/* HERO */
.hero {
  padding: 160px 0 100px; position: relative; overflow: hidden; text-align: center;
}

.hero::before {
  content: ''; position: absolute; top: -100px; left: 50%;
  transform: translateX(-50%); width: 900px; height: 500px;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.hero__timer {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 10px 24px; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius-xl);
  margin-bottom: 32px; font-size: 0.9rem; color: var(--accent);
  font-weight: 600; animation: fadeInUp 0.8s ease;
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.2rem, 5.5vw, 3.6rem);
  font-weight: 800; line-height: 1.15; margin-bottom: 24px;
  max-width: 850px; margin-left: auto; margin-right: auto;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero__title span {
  background: linear-gradient(135deg, var(--accent), var(--accent-hover));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text;
}

.hero__desc {
  font-size: 1.1rem; color: var(--text-secondary); line-height: 1.9;
  max-width: 640px; margin: 0 auto 40px;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero__cta-group {
  display: flex; justify-content: center; gap: 16px; flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

/* TRUST BAR */
.trust-bar {
  padding: 50px 0;
  border-top: 1px solid var(--border-subtle);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--surface);
}

.trust-bar__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 20px; text-align: center;
}

.trust-bar__item {
  display: flex; flex-direction: column; align-items: center; gap: 6px; padding: 14px;
}

.trust-bar__icon { font-size: 1.4rem; }
.trust-bar__label { font-size: 0.78rem; font-weight: 600; color: var(--text-secondary); }

/* ANALOGY SECTION */
.analogy-box {
  background: linear-gradient(135deg, var(--bg-card), var(--surface));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg); padding: 48px;
  max-width: 700px; margin: 48px auto 0; text-align: center;
  position: relative; overflow: hidden;
}

.analogy-box::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0;
  height: 3px; background: linear-gradient(90deg, var(--accent), var(--accent-hover));
}

.analogy-box__emoji { font-size: 3rem; margin-bottom: 20px; }

.analogy-box__text {
  font-size: 1.15rem; color: var(--text-primary); line-height: 1.9;
  font-weight: 500;
}

/* BENEFITS PILLS */
.benefits-pills {
  display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin-top: 48px;
}

.pill {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 16px 28px; background: var(--bg-card);
  border: 1px solid var(--border-subtle); border-radius: var(--radius-xl);
  font-size: 0.95rem; font-weight: 600; color: var(--text-primary);
  transition: var(--transition);
}

.pill:hover {
  border-color: var(--border); transform: translateY(-2px); box-shadow: var(--shadow-sm);
}

.pill__icon { font-size: 1.2rem; }

/* STEPS SECTION — LARGE NUMBERED CARDS */
.steps-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(340px, 1fr));
  gap: 24px; margin-top: 48px;
}

.step-card {
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 36px;
  transition: var(--transition); position: relative; overflow: hidden;
}

.step-card::before {
  content: ''; position: absolute; top: 0; left: 0;
  width: 4px; height: 100%;
  background: linear-gradient(to bottom, var(--accent), transparent);
  opacity: 0; transition: var(--transition);
}

.step-card:hover::before { opacity: 1; }
.step-card:hover { border-color: var(--border); transform: translateY(-3px); box-shadow: var(--shadow-md); }

.step-card__number {
  font-family: var(--font-display); font-size: 3rem; font-weight: 800;
  color: var(--accent); opacity: 0.3; line-height: 1; margin-bottom: 16px;
}

.step-card__title {
  font-family: var(--font-display); font-size: 1.2rem;
  font-weight: 700; margin-bottom: 12px;
}

.step-card__time {
  font-size: 0.75rem; font-weight: 700; color: var(--accent);
  text-transform: uppercase; letter-spacing: 2px; margin-bottom: 12px;
}

.step-card__text {
  color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7;
}

/* COMPARISON TABLE */
.comparison-block {
  max-width: 700px; margin: 48px auto 0;
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); overflow: hidden;
}

.comparison-block__header {
  padding: 20px 28px; background: var(--surface);
  border-bottom: 1px solid var(--border-subtle);
  display: grid; grid-template-columns: 1fr 1fr;
  font-weight: 700; font-size: 0.85rem; color: var(--text-muted);
  text-transform: uppercase; letter-spacing: 1px;
}

.comparison-row {
  display: grid; grid-template-columns: 1fr 1fr;
  padding: 16px 28px; border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}

.comparison-row:last-child { border-bottom: none; }
.comparison-row:hover { background: var(--bg-card-hover); }

.comparison-row__left { color: var(--text-secondary); font-size: 0.92rem; }
.comparison-row__right { color: var(--accent); font-weight: 600; font-size: 0.92rem; }

/* FAQ */
.faq__list {
  max-width: 760px; margin: 48px auto 0;
  display: flex; flex-direction: column; gap: 12px;
}

.faq-item {
  border: 1px solid var(--border-subtle); border-radius: var(--radius-md);
  overflow: hidden; transition: var(--transition);
}

.faq-item:hover { border-color: var(--border); }

.faq-item__question {
  width: 100%; background: var(--bg-card); border: none;
  color: var(--text-primary); font-family: var(--font-body);
  font-size: 1rem; font-weight: 600; text-align: left;
  padding: 22px 28px; cursor: pointer;
  display: flex; justify-content: space-between; align-items: center; gap: 16px;
  transition: var(--transition);
}

.faq-item__question:hover { background: var(--bg-card-hover); }

.faq-item__icon {
  flex-shrink: 0; width: 28px; height: 28px; border-radius: 50%;
  background: var(--surface); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: var(--accent); transition: var(--transition);
}

.faq-item.active .faq-item__icon { transform: rotate(45deg); }

.faq-item__answer {
  max-height: 0; overflow: hidden; transition: max-height 0.4s ease;
}

.faq-item.active .faq-item__answer { max-height: 300px; }

.faq-item__answer-inner {
  padding: 0 28px 22px; color: var(--text-secondary); line-height: 1.8;
}

/* TESTIMONIALS */
.testimonials__grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 24px; margin-top: 48px;
}

.testimonial-card {
  background: var(--bg-card); border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md); padding: 28px;
}

.testimonial-card__quote { font-size: 2rem; color: var(--accent); opacity: 0.3; line-height: 1; margin-bottom: 8px; }
.testimonial-card__text { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.8; font-style: italic; margin-bottom: 16px; }
.testimonial-card__author { display: flex; align-items: center; gap: 12px; }
.testimonial-card__avatar {
  width: 38px; height: 38px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 0.8rem; color: #fff;
}
.testimonial-card__name { font-weight: 600; font-size: 0.88rem; }
.testimonial-card__location { font-size: 0.78rem; color: var(--text-muted); }

/* CTA */
.cta-section {
  padding: 100px 0; text-align: center; position: relative; overflow: hidden;
}

.cta-section::before {
  content: ''; position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%); width: 800px; height: 400px;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 70%);
  pointer-events: none;
}

.cta-section__content { position: relative; z-index: 1; }

.cta-section__title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4vw, 3rem); font-weight: 800; margin-bottom: 20px;
}

.cta-section__desc {
  font-size: 1.1rem; color: var(--text-secondary); max-width: 600px;
  margin: 0 auto 40px; line-height: 1.8;
}

.cta-btn {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 18px 40px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  color: #fff; font-weight: 800; font-size: 1.05rem;
  border: none; border-radius: var(--radius-md); cursor: pointer;
  transition: var(--transition); text-decoration: none;
  box-shadow: 0 4px 20px rgba(96, 165, 250, 0.25);
}

.cta-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 32px rgba(96, 165, 250, 0.35); color: #fff;
}

.cta-btn--outline {
  background: transparent; border: 2px solid var(--accent);
  color: var(--accent); box-shadow: none; margin-left: 16px;
}

.cta-btn--outline:hover {
  background: var(--accent-glow); color: var(--accent); box-shadow: none;
}

/* RISK */
.risk-disclosure {
  background: rgba(248, 113, 113, 0.05); border: 1px solid rgba(248, 113, 113, 0.15);
  border-radius: var(--radius-md); padding: 28px 32px; margin-top: 48px;
}

.risk-disclosure__title {
  font-size: 0.85rem; font-weight: 700; color: var(--danger);
  text-transform: uppercase; letter-spacing: 1px; margin-bottom: 12px;
}

.risk-disclosure__text { color: var(--text-muted); font-size: 0.85rem; line-height: 1.8; }

/* FOOTER */
.site-footer {
  padding: 48px 0; border-top: 1px solid var(--border-subtle); text-align: center;
}

.site-footer__text { color: var(--text-muted); font-size: 0.8rem; line-height: 1.8; max-width: 700px; margin: 0 auto; }
.site-footer__links { margin-top: 20px; display: flex; justify-content: center; gap: 24px; flex-wrap: wrap; }
.site-footer__link { color: var(--text-muted); font-size: 0.8rem; }
.site-footer__link:hover { color: var(--accent); }

/* ANIMATIONS */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}

.animate-on-scroll {
  opacity: 0; transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* RESPONSIVE */
@media (max-width: 768px) {
  .section { padding: 60px 0; }
  .hero { padding: 120px 0 60px; }
  .steps-grid { grid-template-columns: 1fr; }
  .testimonials__grid { grid-template-columns: 1fr; }
  .hero__cta-group { flex-direction: column; align-items: center; }
  .cta-btn--outline { margin-left: 0; margin-top: 0; }
  .nav__badge { display: none; }
  .comparison-block__header, .comparison-row { grid-template-columns: 1fr 1fr; font-size: 0.82rem; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .trust-bar__grid { grid-template-columns: repeat(2, 1fr); }
  .cta-btn { width: 100%; justify-content: center; }
  .cta-btn--outline { width: 100%; justify-content: center; }
  .benefits-pills { flex-direction: column; align-items: center; }
}