/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body { font-family: -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Inter', sans-serif; color: #1d1d1f; background: #fff; line-height: 1.6; -webkit-font-smoothing: antialiased; }
.container { max-width: 1080px; margin: 0 auto; padding: 0 32px; }
a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* ===== ACCENT COLOR — un solo azul limpio ===== */
:root { --blue: #0071e3; --blue-dark: #0051a2; --text: #1d1d1f; --text-secondary: #6e6e73; --bg-gray: #f5f5f7; --border: #d2d2d7; }

/* ===== BUTTONS ===== */
.btn { display: inline-block; border-radius: 980px; font-weight: 500; cursor: pointer; transition: all 0.2s; border: 1.5px solid transparent; letter-spacing: -0.01em; }
.btn-primary { background: var(--blue); color: #fff; border-color: var(--blue); }
.btn-primary:hover { background: var(--blue-dark); border-color: var(--blue-dark); }
.btn-outline { background: transparent; color: var(--blue); border-color: var(--blue); }
.btn-outline:hover { background: var(--blue); color: #fff; }
.btn-ghost { background: rgba(255,255,255,0.15); color: #fff; border-color: rgba(255,255,255,0.3); backdrop-filter: blur(10px); }
.btn-ghost:hover { background: rgba(255,255,255,0.25); }
.btn-white { background: #fff; color: var(--blue); border-color: #fff; }
.btn-white:hover { background: #f0f6ff; }
.btn-dark { background: #1d1d1f; color: #fff; border-color: #1d1d1f; }
.btn-dark:hover { background: #333; }
.btn-sm { padding: 8px 20px; font-size: 14px; }
.btn-lg { padding: 17px 36px; font-size: 17px; font-weight: 600; }
.btn-full { display: block; text-align: center; padding: 14px; margin-top: 24px; font-size: 15px; }

/* ===== NAVBAR ===== */
.navbar { position: sticky; top: 0; z-index: 100; background: rgba(255,255,255,0.85); backdrop-filter: saturate(180%) blur(20px); border-bottom: 1px solid rgba(0,0,0,0.08); padding: 0; }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 52px; }
.logo { font-size: 18px; font-weight: 700; color: var(--text); letter-spacing: -0.03em; }
.logo span { color: var(--blue); }
.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--text-secondary); font-size: 14px; font-weight: 400; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }

/* ===== HERO ===== */
.hero { background: #000; color: #fff; padding: 100px 0 80px; text-align: center; position: relative; overflow: hidden; }
.hero::before { content: ''; position: absolute; inset: 0; background: radial-gradient(ellipse 80% 60% at 50% 20%, rgba(0,113,227,0.25) 0%, transparent 70%); pointer-events: none; }
.hero-eyebrow { font-size: 14px; font-weight: 600; color: var(--blue); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 16px; }
.hero h1 { font-size: 64px; font-weight: 700; line-height: 1.05; letter-spacing: -0.03em; margin-bottom: 20px; color: #f5f5f7; }
.hero h1 em { font-style: normal; color: #fff; }
.hero-sub { font-size: 21px; color: rgba(255,255,255,0.65); max-width: 540px; margin: 0 auto 40px; font-weight: 300; letter-spacing: -0.01em; line-height: 1.5; }
.hero-ctas { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; margin-bottom: 28px; }
.hero-proof { display: flex; gap: 28px; justify-content: center; font-size: 13px; color: rgba(255,255,255,0.45); flex-wrap: wrap; }
.hero-proof span::before { content: '✓ '; color: var(--blue); }

/* Chat Mockup */
.chat-mockup { max-width: 400px; margin: 64px auto 0; background: #1c1c1e; border-radius: 24px; overflow: hidden; box-shadow: 0 40px 80px rgba(0,0,0,0.6), 0 0 0 1px rgba(255,255,255,0.08); text-align: left; }
.chat-header { background: #2c2c2e; color: #fff; padding: 16px 20px; display: flex; align-items: center; gap: 12px; border-bottom: 1px solid rgba(255,255,255,0.06); }
.chat-avatar { font-size: 28px; }
.chat-name { font-weight: 600; font-size: 15px; color: #f5f5f7; }
.chat-status { font-size: 12px; color: #34c759; }
.chat-body { background: #000; padding: 20px 16px; display: flex; flex-direction: column; gap: 10px; }
.msg { max-width: 80%; padding: 10px 14px; font-size: 14px; line-height: 1.45; }
.msg-left { background: #2c2c2e; color: #f5f5f7; border-radius: 4px 18px 18px 18px; align-self: flex-start; }
.msg-right { background: #0a7aff; color: #fff; border-radius: 18px 4px 18px 18px; align-self: flex-end; }

/* ===== SECTIONS COMMON ===== */
section { padding: 96px 0; }
h2 { font-size: 48px; font-weight: 700; text-align: center; margin-bottom: 12px; color: var(--text); letter-spacing: -0.03em; line-height: 1.1; }
.section-sub { text-align: center; color: var(--text-secondary); font-size: 19px; margin-bottom: 56px; font-weight: 300; }
.section-eyebrow { text-align: center; font-size: 13px; font-weight: 600; color: var(--blue); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 12px; }

/* ===== COMPLEMENT (antes: compare) ===== */
.complement { background: var(--bg-gray); }
.complement-intro { max-width: 680px; margin: 0 auto 56px; text-align: center; }
.complement-intro p { font-size: 19px; color: var(--text-secondary); line-height: 1.6; }
.complement-intro strong { color: var(--text); font-weight: 600; }
.complement-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2px; background: var(--border); border-radius: 20px; overflow: hidden; }
.complement-card { background: #fff; padding: 36px 28px; }
.complement-card:first-child { border-radius: 20px 0 0 20px; }
.complement-card:last-child { border-radius: 0 20px 20px 0; background: #f0f6ff; }
.complement-icon { font-size: 32px; margin-bottom: 16px; }
.complement-card h3 { font-size: 18px; font-weight: 700; margin-bottom: 12px; letter-spacing: -0.02em; }
.complement-card p { font-size: 15px; color: var(--text-secondary); line-height: 1.6; }
.complement-card.card-highlight h3 { color: var(--blue); }

/* ===== HOW IT WORKS ===== */
.how { background: #fff; }
.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin-top: 56px; position: relative; }
.steps::before { content: ''; position: absolute; top: 28px; left: 12.5%; right: 12.5%; height: 1px; background: var(--border); z-index: 0; }
.step { text-align: center; padding: 0 16px; position: relative; z-index: 1; }
.step-number { width: 56px; height: 56px; background: var(--blue); color: #fff; border-radius: 50%; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 700; margin: 0 auto 20px; box-shadow: 0 0 0 6px #fff; }
.step h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; letter-spacing: -0.01em; }
.step p { font-size: 14px; color: var(--text-secondary); line-height: 1.5; }

/* ===== SUBJECTS ===== */
.subjects { background: var(--bg-gray); text-align: center; }
.subject-tags { display: flex; flex-wrap: wrap; gap: 10px; justify-content: center; margin-top: 40px; }
.subject-tags span { background: #fff; border: 1.5px solid var(--border); border-radius: 980px; padding: 8px 20px; font-size: 14px; font-weight: 500; color: var(--text); transition: all 0.2s; }
.subject-tags span:hover { border-color: var(--blue); color: var(--blue); }
.tag-special { background: #f0f6ff !important; border-color: #b8d4f8 !important; color: var(--blue) !important; font-weight: 600 !important; }

/* ===== ACCESSIBILITY ===== */
.accessibility { background: #000; color: #fff; }
.accessibility h2 { color: #f5f5f7; }
.accessibility .section-sub { color: rgba(255,255,255,0.5); }
.access-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 16px; margin-top: 48px; }
.access-card { background: #1c1c1e; border: 1px solid rgba(255,255,255,0.08); border-radius: 20px; padding: 28px 24px; text-align: left; transition: border-color 0.2s; }
.access-card:hover { border-color: rgba(0,113,227,0.5); }
.access-icon { font-size: 32px; margin-bottom: 14px; }
.access-card h3 { font-size: 16px; font-weight: 600; margin-bottom: 8px; color: #f5f5f7; letter-spacing: -0.01em; }
.access-card p { font-size: 13px; color: rgba(255,255,255,0.5); line-height: 1.6; }
.disclaimer-box { margin-top: 40px; background: rgba(255,255,255,0.05); border: 1px solid rgba(255,255,255,0.1); border-radius: 14px; padding: 18px 28px; font-size: 14px; color: rgba(255,255,255,0.45); text-align: center; }
.disclaimer-box strong { color: rgba(255,255,255,0.7); }

/* ===== PRICING ===== */
.pricing { background: var(--bg-gray); }
.pricing-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin-top: 48px; }
.plan-card { background: #fff; border: 1.5px solid var(--border); border-radius: 24px; padding: 36px 32px; position: relative; transition: box-shadow 0.2s; }
.plan-card:hover { box-shadow: 0 8px 40px rgba(0,0,0,0.08); }
.plan-popular { border-color: var(--blue); box-shadow: 0 8px 40px rgba(0,113,227,0.12); }
.popular-badge { position: absolute; top: -14px; left: 50%; transform: translateX(-50%); background: var(--blue); color: #fff; border-radius: 980px; padding: 4px 18px; font-size: 12px; font-weight: 600; white-space: nowrap; letter-spacing: 0.02em; }
.plan-name { font-size: 20px; font-weight: 700; color: var(--text); margin-bottom: 6px; letter-spacing: -0.02em; }
.plan-price { font-size: 44px; font-weight: 700; color: var(--text); margin-bottom: 4px; letter-spacing: -0.04em; line-height: 1; }
.plan-price span { font-size: 16px; font-weight: 400; color: var(--text-secondary); letter-spacing: 0; }
.plan-desc { font-size: 14px; color: var(--text-secondary); margin: 12px 0 20px; padding-bottom: 20px; border-bottom: 1px solid var(--border); line-height: 1.5; }
.plan-features li { padding: 7px 0; font-size: 14px; color: var(--text-secondary); border-bottom: 1px solid #f5f5f7; }
.plan-features li:last-child { border: none; }
.savings-banner { margin-top: 36px; text-align: center; font-size: 15px; color: var(--text-secondary); padding: 20px; background: #fff; border-radius: 14px; border: 1.5px solid var(--border); }

/* ===== FAQ ===== */
.faq { background: #fff; }
.faq-list { max-width: 680px; margin: 48px auto 0; }
.faq-item { border-bottom: 1px solid var(--border); }
.faq-q { padding: 20px 0; font-weight: 500; font-size: 16px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; color: var(--text); letter-spacing: -0.01em; }
.faq-q:hover { color: var(--blue); }
.faq-q span { font-size: 24px; color: var(--text-secondary); font-weight: 300; flex-shrink: 0; margin-left: 16px; }
.faq-a { display: none; padding: 0 0 20px; font-size: 15px; color: var(--text-secondary); line-height: 1.7; }

/* ===== CTA FINAL ===== */
.cta-final { background: #000; color: #fff; text-align: center; padding: 120px 0; }
.cta-final h2 { color: #f5f5f7; font-size: 52px; margin-bottom: 16px; }
.cta-final > .container > p { color: rgba(255,255,255,0.55); font-size: 19px; margin-bottom: 40px; font-weight: 300; }
.cta-sub { margin-top: 16px; font-size: 13px; color: rgba(255,255,255,0.3); }

/* ===== FOOTER ===== */
.footer { background: #1d1d1f; color: #6e6e73; padding: 40px 0; }
.footer-inner { display: flex; flex-direction: column; align-items: center; gap: 16px; text-align: center; }
.footer-logo { font-size: 16px; font-weight: 600; color: #f5f5f7; }
.footer-links { display: flex; gap: 24px; flex-wrap: wrap; justify-content: center; }
.footer-links a { font-size: 13px; color: #6e6e73; transition: color 0.2s; }
.footer-links a:hover { color: #f5f5f7; }
.footer-copy { font-size: 12px; color: #424245; }

/* ===== RESPONSIVE ===== */
@media (max-width: 900px) {
  .hero h1 { font-size: 44px; }
  h2 { font-size: 36px; }
  .complement-grid { grid-template-columns: 1fr; background: none; gap: 12px; }
  .complement-card { border-radius: 16px !important; border: 1.5px solid var(--border); }
  .pricing-grid { grid-template-columns: 1fr; }
  .access-grid { grid-template-columns: repeat(2, 1fr); }
  .steps { grid-template-columns: repeat(2, 1fr); }
  .steps::before { display: none; }
}
@media (max-width: 600px) {
  .hero h1 { font-size: 32px; }
  h2 { font-size: 28px; }
  .nav-links a:not(.btn) { display: none; }
  .access-grid { grid-template-columns: 1fr; }
  .hero-ctas { flex-direction: column; align-items: center; }
  .steps { grid-template-columns: 1fr; }
}