/* ═══════════════════════════════════════════
   EchoVeil Landing Page — Styles
   ═══════════════════════════════════════════ */

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

:root {
  --bg-primary: #0d0d0d;
  --bg-surface: #1a1a2e;
  --bg-surface-hover: #222240;
  --accent: #00d4aa;
  --accent-dim: rgba(0, 212, 170, 0.15);
  --accent-glow: rgba(0, 212, 170, 0.4);
  --purple: #7c3aed;
  --purple-dim: rgba(124, 58, 237, 0.15);
  --text-primary: #e0e0e0;
  --text-muted: #888888;
  --error: #f44336;
  --radius: 12px;
  --radius-sm: 8px;
  --transition: 0.3s ease;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-x: hidden;
}

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

a:hover {
  color: #33e0be;
}

ul {
  list-style: none;
}

/* ── Container ── */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 14px 32px;
  border-radius: var(--radius);
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all var(--transition);
  text-decoration: none;
}

.btn-primary {
  background: var(--accent);
  color: #0d0d0d;
}

.btn-primary:hover {
  background: #33e0be;
  color: #0d0d0d;
  transform: translateY(-2px);
}

.btn-glow {
  box-shadow: 0 0 20px var(--accent-glow), 0 0 60px rgba(0, 212, 170, 0.1);
}

.btn-glow:hover {
  box-shadow: 0 0 30px var(--accent-glow), 0 0 80px rgba(0, 212, 170, 0.15);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid rgba(255, 255, 255, 0.15);
}

.btn-ghost:hover {
  border-color: rgba(255, 255, 255, 0.3);
  background: rgba(255, 255, 255, 0.05);
  color: #fff;
}

.btn-lg {
  padding: 18px 48px;
  font-size: 1.1rem;
}

/* ── Sections ── */
.section {
  padding: 100px 0;
}

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

.section-title {
  font-size: 2.5rem;
  font-weight: 800;
  text-align: center;
  margin-bottom: 12px;
  letter-spacing: -0.02em;
}

.section-subtitle {
  text-align: center;
  color: var(--text-muted);
  font-size: 1.15rem;
  margin-bottom: 56px;
}

/* ── Hero ── */
.hero {
  padding: 140px 0 100px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: 50%;
  transform: translateX(-50%);
  width: 800px;
  height: 800px;
  background: radial-gradient(circle, rgba(0, 212, 170, 0.06) 0%, transparent 70%);
  pointer-events: none;
}

.hero-badge {
  display: inline-block;
  padding: 8px 20px;
  border-radius: 100px;
  background: var(--accent-dim);
  color: var(--accent);
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-bottom: 32px;
  border: 1px solid rgba(0, 212, 170, 0.2);
}

.hero-title {
  font-size: clamp(2.8rem, 6vw, 4.5rem);
  font-weight: 800;
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin-bottom: 24px;
}

.gradient-text {
  background: linear-gradient(135deg, var(--accent) 0%, var(--purple) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-subtitle {
  max-width: 560px;
  margin: 0 auto 40px;
  font-size: 1.2rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 64px;
}

/* ── Hero logo ── */
.hero-visual {
  display: flex;
  justify-content: center;
  margin-top: 20px;
}

.hero-logo {
  filter: drop-shadow(0 0 24px rgba(0, 212, 170, 0.3)) drop-shadow(0 0 60px rgba(0, 212, 170, 0.1));
  max-width: 100%;
  height: auto;
}

/* ── Steps (How it works) ── */
.steps {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  gap: 0;
}

.step {
  flex: 0 1 280px;
  text-align: center;
  padding: 32px 24px;
  position: relative;
}

.step-icon {
  width: 64px;
  height: 64px;
  border-radius: 16px;
  background: var(--accent-dim);
  color: var(--accent);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  border: 1px solid rgba(0, 212, 170, 0.2);
}

.step-number {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 12px;
}

.step h3 {
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.step p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.step-connector {
  display: flex;
  align-items: center;
  padding-top: 52px;
  flex-shrink: 0;
}

/* ── Features Grid ── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: rgba(13, 13, 13, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 32px 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: rgba(0, 212, 170, 0.15);
  background: rgba(13, 13, 13, 0.8);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  background: var(--accent-dim);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
}

.feature-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.feature-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ── Demo ── */
.demo-placeholder {
  max-width: 720px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px dashed rgba(255, 255, 255, 0.1);
  border-radius: var(--radius);
  padding: 80px 40px;
  text-align: center;
}

.demo-icon {
  margin-bottom: 16px;
  opacity: 0.5;
}

.demo-placeholder p {
  font-size: 1.1rem;
  color: var(--text-muted);
  font-weight: 500;
}

.demo-note {
  display: block;
  margin-top: 8px;
  font-size: 0.85rem;
  color: rgba(136, 136, 136, 0.6);
}

/* ── Requirements ── */
.requirements-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.req-card {
  background: rgba(13, 13, 13, 0.6);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: var(--radius);
  padding: 32px 28px;
  text-align: center;
  transition: all var(--transition);
}

.req-card:hover {
  border-color: rgba(124, 58, 237, 0.2);
  transform: translateY(-2px);
}

.req-icon {
  margin-bottom: 16px;
}

.req-card h3 {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
}

.req-card p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.5;
}

/* ── Pricing ── */
.pricing-card {
  max-width: 440px;
  margin: 0 auto;
  background: var(--bg-surface);
  border: 1px solid rgba(0, 212, 170, 0.15);
  border-radius: 20px;
  padding: 48px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.pricing-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), var(--purple));
}

.pricing-badge {
  display: inline-block;
  padding: 6px 16px;
  border-radius: 100px;
  background: var(--purple-dim);
  color: var(--purple);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 24px;
  border: 1px solid rgba(124, 58, 237, 0.2);
}

.pricing-amount {
  margin-bottom: 8px;
  line-height: 1;
}

.price-currency {
  font-size: 1.8rem;
  font-weight: 700;
  vertical-align: top;
  margin-right: 4px;
  color: var(--text-muted);
}

.price-value {
  font-size: 5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.pricing-desc {
  color: var(--text-muted);
  margin-bottom: 32px;
  font-size: 1rem;
}

.pricing-features {
  text-align: left;
  margin-bottom: 36px;
}

.pricing-features li {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 10px 0;
  font-size: 0.95rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.04);
}

.pricing-features li:last-child {
  border-bottom: none;
}

.pricing-features li svg {
  flex-shrink: 0;
}

.pricing-guarantee {
  margin-top: 16px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* ── FAQ ── */
.faq-list {
  max-width: 720px;
  margin: 0 auto;
}

.faq-item {
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-question {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 0;
  background: none;
  border: none;
  color: var(--text-primary);
  font-family: inherit;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color var(--transition);
}

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

.faq-chevron {
  transition: transform var(--transition);
  flex-shrink: 0;
  margin-left: 16px;
}

.faq-item.active .faq-chevron {
  transform: rotate(180deg);
}

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

.faq-item.active .faq-answer {
  max-height: 300px;
  padding-bottom: 20px;
}

.faq-answer p {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.7;
}

.faq-answer code {
  background: rgba(255, 255, 255, 0.08);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}

/* ── Footer ── */
.footer {
  padding: 64px 0 32px;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-logo {
  font-size: 1.3rem;
  font-weight: 800;
  margin-bottom: 12px;
  background: linear-gradient(135deg, var(--accent), var(--purple));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.footer-brand p {
  font-size: 0.9rem;
  color: var(--text-muted);
  line-height: 1.6;
}

.footer-links h4 {
  font-size: 0.85rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  margin-bottom: 16px;
}

.footer-links li {
  margin-bottom: 10px;
}

.footer-links a {
  color: var(--text-muted);
  font-size: 0.9rem;
  transition: color var(--transition);
}

.footer-links a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  padding-top: 24px;
  text-align: center;
}

.footer-bottom p {
  font-size: 0.85rem;
  color: rgba(136, 136, 136, 0.6);
}

/* ── Fade-in animation ── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ═══════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════ */

/* Tablet */
@media (max-width: 768px) {
  .section {
    padding: 72px 0;
  }

  .hero {
    padding: 100px 0 72px;
  }

  .hero-title {
    font-size: 2.5rem;
  }

  .hero-subtitle {
    font-size: 1.05rem;
  }

  .section-title {
    font-size: 2rem;
  }

  .steps {
    flex-direction: column;
    align-items: center;
  }

  .step {
    flex: none;
    max-width: 400px;
  }

  .step-connector {
    transform: rotate(90deg);
    padding-top: 0;
    padding: 8px 0;
  }

  .features-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .requirements-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

/* Mobile */
@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  .section {
    padding: 56px 0;
  }

  .hero {
    padding: 80px 0 56px;
  }

  .hero-title {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 0.95rem;
  }

  .hero-cta {
    flex-direction: column;
    align-items: stretch;
    margin-bottom: 40px;
  }

  .section-title {
    font-size: 1.7rem;
  }

  .section-subtitle {
    font-size: 1rem;
    margin-bottom: 40px;
  }

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

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

  .pricing-card {
    padding: 36px 24px;
  }

  .price-value {
    font-size: 4rem;
  }

  .btn-lg {
    padding: 16px 32px;
    font-size: 1rem;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero-logo {
    width: 200px;
    height: 200px;
  }
}