/* ============================================
   TraceAI — Design System
   Cores, tipografia, componentes reutilizáveis
   ============================================ */

:root {
  /* Paleta */
  --bg-0: #0a0e13;
  --bg-1: #0f141b;
  --bg-2: #161c25;
  --bg-3: #1d2530;
  --border: #2a3441;
  --border-strong: #3a4555;

  --text-0: #ffffff;
  --text-1: #e6ebf2;
  --text-2: #a8b3c2;
  --text-3: #6b7686;

  --accent: #00ff88;
  --accent-dim: #00cc6e;
  --accent-glow: rgba(0, 255, 136, 0.15);
  --accent-soft: rgba(0, 255, 136, 0.08);

  --danger: #ff4d6d;
  --danger-glow: rgba(255, 77, 109, 0.12);
  --warn: #ffb547;
  --warn-glow: rgba(255, 181, 71, 0.12);
  --info: #4dabff;
  --info-glow: rgba(77, 171, 255, 0.12);

  /* Tipografia */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', 'Courier New', monospace;

  /* Layout */
  --radius-sm: 6px;
  --radius: 10px;
  --radius-lg: 16px;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.2);
  --shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.4);

  --container: 1200px;
  --container-narrow: 760px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-0);
  color: var(--text-1);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

/* Background ambient effect */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background:
    radial-gradient(circle at 15% 10%, var(--accent-glow) 0%, transparent 35%),
    radial-gradient(circle at 85% 80%, rgba(77, 171, 255, 0.06) 0%, transparent 40%);
  pointer-events: none;
  z-index: 0;
}

.container {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 24px;
  position: relative;
  z-index: 1;
}

.container-narrow {
  max-width: var(--container-narrow);
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Typography ===== */
h1, h2, h3, h4, h5, h6 {
  color: var(--text-0);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }
h4 { font-size: 1.15rem; }

p {
  color: var(--text-2);
  margin-bottom: 1rem;
}

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.2s;
}

a:hover {
  color: var(--accent-dim);
}

code {
  font-family: var(--font-mono);
  background: var(--bg-2);
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
  color: var(--accent);
  border: 1px solid var(--border);
}

/* ===== Navbar ===== */
.navbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 14, 19, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 1.25rem;
  color: var(--text-0);
  letter-spacing: -0.03em;
}

.logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), var(--accent-dim));
  border-radius: 8px;
  display: grid;
  place-items: center;
  color: var(--bg-0);
  font-weight: 900;
  box-shadow: 0 0 20px var(--accent-glow);
}

.logo span.dot {
  color: var(--accent);
}

.nav-links {
  display: flex;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  color: var(--text-2);
  padding: 8px 16px;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.95rem;
  transition: all 0.2s;
}

.nav-links a:hover, .nav-links a.active {
  color: var(--text-0);
  background: var(--bg-2);
}

.nav-cta {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* ===== Language switcher: pills PT | EN | ES ===== */
.lang-switch {
  display: inline-flex;
  align-items: center;
  padding: 3px;
  background: var(--bg-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  gap: 2px;
}

.lang-pill {
  appearance: none;
  background: transparent;
  border: none;
  color: var(--text-2);
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  padding: 6px 10px;
  border-radius: 4px;
  cursor: pointer;
  transition: color 0.15s, background 0.15s;
  line-height: 1;
  min-width: 34px;
}

.lang-pill:hover {
  color: var(--text-1);
  background: var(--bg-3);
}

.lang-pill.active {
  color: var(--bg-0);
  background: var(--accent);
}

.lang-pill:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.mobile-toggle {
  display: none;
  background: none;
  border: 1px solid var(--border);
  color: var(--text-1);
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 1.2rem;
}

/* ===== Buttons ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition: all 0.2s;
  border: none;
  font-family: inherit;
  text-decoration: none;
}

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

.btn-primary:hover {
  background: var(--accent-dim);
  color: var(--bg-0);
  transform: translateY(-1px);
  box-shadow: 0 8px 24px var(--accent-glow);
}

.btn-ghost {
  background: transparent;
  color: var(--text-1);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
  background: var(--bg-2);
  border-color: var(--accent);
  color: var(--accent);
}

.btn-lg {
  padding: 14px 28px;
  font-size: 1rem;
}

/* ===== Hero ===== */
.hero {
  padding: 80px 0 100px;
  position: relative;
  overflow: hidden;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--accent-soft);
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 24px;
}

.hero-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background: var(--accent);
  border-radius: 50%;
  box-shadow: 0 0 10px var(--accent);
  animation: pulse 2s infinite;
}

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

.hero h1 {
  margin-bottom: 24px;
  max-width: 900px;
}

.hero h1 .highlight {
  background: linear-gradient(120deg, var(--accent), #4dabff);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-2);
  max-width: 680px;
  margin-bottom: 36px;
}

.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 60px;
}

/* ===== Stats strip ===== */
.stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 24px;
  padding: 32px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.stat {
  text-align: center;
}

.stat-num {
  font-size: 2.4rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.03em;
  display: block;
  font-family: var(--font-mono);
}

.stat-label {
  color: var(--text-3);
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ===== Section header ===== */
.section {
  padding: 80px 0;
}

.section-head {
  margin-bottom: 48px;
  text-align: center;
}

.section-eyebrow {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  margin-bottom: 12px;
}

.section-head p {
  max-width: 600px;
  margin: 16px auto 0;
  font-size: 1.1rem;
}

/* ===== Cards / Grid ===== */
.grid {
  display: grid;
  gap: 24px;
}

.grid-3 { grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); }
.grid-2 { grid-template-columns: repeat(auto-fit, minmax(380px, 1fr)); }
.grid-4 { grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); }

.card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all 0.25s;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow);
}

.card-link {
  display: block;
  color: inherit;
}

.card-link:hover {
  color: inherit;
}

.card .card-icon {
  width: 48px;
  height: 48px;
  border-radius: var(--radius-sm);
  display: grid;
  place-items: center;
  margin-bottom: 18px;
  font-size: 1.4rem;
  background: var(--accent-soft);
  color: var(--accent);
}

.card h3 {
  margin-bottom: 10px;
}

.card p {
  color: var(--text-2);
  font-size: 0.95rem;
}

.card .meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 18px;
  font-size: 0.85rem;
  color: var(--text-3);
}

.card .meta .tag {
  background: var(--bg-3);
  color: var(--text-1);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 500;
}

/* Platform card variant */
.platform-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  transition: all 0.2s;
  color: inherit;
}

.platform-card:hover {
  border-color: var(--accent);
  background: var(--bg-2);
  color: inherit;
  transform: translateX(4px);
}

.platform-icon {
  width: 52px;
  height: 52px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.platform-icon svg {
  width: 28px;
  height: 28px;
  display: block;
}

.p-instagram { background: linear-gradient(135deg, #833ab4, #fd1d1d, #fcb045); color: #fff; }
.p-whatsapp { background: #25d366; color: #fff; }
.p-tiktok { background: #000; color: #fff; border: 1px solid #25f4ee; }
.p-facebook { background: #1877f2; color: #fff; }
.p-telegram { background: linear-gradient(135deg, #0088cc, #2ca5e0); color: #fff; }
.p-snapchat { background: #fffc00; color: #1a1a1a; }

.platform-card h4 {
  margin-bottom: 4px;
}

.platform-card .count {
  color: var(--text-3);
  font-size: 0.85rem;
}

/* ===== Featured / Article cards ===== */
.article-card {
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all 0.25s;
}

.article-card:hover {
  transform: translateY(-4px);
  border-color: var(--accent);
  box-shadow: var(--shadow);
}

.article-cover {
  height: 180px;
  background: linear-gradient(135deg, var(--bg-2), var(--bg-3));
  position: relative;
  display: grid;
  place-items: center;
  overflow: hidden;
}

.article-cover::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, transparent 50%, rgba(10, 14, 19, 0.8));
}

.article-cover .cover-icon {
  font-size: 3rem;
  opacity: 0.4;
  z-index: 1;
}

.article-cover .category-pill {
  position: absolute;
  top: 14px;
  left: 14px;
  background: var(--accent);
  color: var(--bg-0);
  padding: 4px 10px;
  border-radius: 4px;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  z-index: 2;
}

.article-body {
  padding: 24px;
}

.article-body h3 {
  margin-bottom: 10px;
  font-size: 1.15rem;
  line-height: 1.3;
}

.article-body p {
  font-size: 0.92rem;
  color: var(--text-2);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.article-meta {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 0.82rem;
  color: var(--text-3);
}

/* ===== Newsletter block ===== */
.newsletter-section {
  background: linear-gradient(135deg, var(--bg-1), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 60px 40px;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.newsletter-section::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -10%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, var(--accent-glow), transparent 60%);
  pointer-events: none;
}

.newsletter-section > * {
  position: relative;
  z-index: 1;
}

.newsletter-section h2 {
  margin-bottom: 16px;
}

.newsletter-section p {
  max-width: 540px;
  margin: 0 auto 32px;
  font-size: 1.05rem;
}

.newsletter-form {
  display: flex;
  gap: 10px;
  max-width: 480px;
  margin: 0 auto;
  flex-wrap: wrap;
}

.newsletter-form input {
  flex: 1;
  min-width: 240px;
  padding: 14px 18px;
  background: var(--bg-0);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--text-0);
  font-family: inherit;
  font-size: 0.95rem;
  outline: none;
  transition: border-color 0.2s;
}

.newsletter-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.newsletter-status {
  margin-top: 16px;
  font-size: 0.9rem;
  min-height: 20px;
}

.newsletter-status.success {
  color: var(--accent);
}

.newsletter-status.error {
  color: var(--danger);
}

/* ===== Callouts ===== */
.callout {
  background: var(--bg-1);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  padding: 18px 22px;
  margin: 24px 0;
  display: flex;
  gap: 14px;
  align-items: flex-start;
}

.callout-icon {
  font-size: 1.3rem;
  flex-shrink: 0;
  margin-top: 2px;
}

.callout.warn {
  background: var(--warn-glow);
  border-left-color: var(--warn);
}

.callout.danger {
  background: var(--danger-glow);
  border-left-color: var(--danger);
}

.callout.info {
  background: var(--info-glow);
  border-left-color: var(--info);
}

.callout h4 {
  color: var(--text-0);
  margin-bottom: 4px;
  font-size: 0.95rem;
}

.callout p {
  color: var(--text-1);
  font-size: 0.92rem;
  margin: 0;
}

/* ===== Footer ===== */
.footer {
  background: var(--bg-1);
  border-top: 1px solid var(--border);
  padding: 60px 0 28px;
  margin-top: 80px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}

.footer-shell {
  grid-template-columns: 1.35fr 0.85fr 1.3fr;
}

.footer-brand p {
  color: var(--text-3);
  font-size: 0.9rem;
  margin-top: 14px;
  max-width: 300px;
}

.footer-logo {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.footer-logo-img {
  width: 34px;
  height: 34px;
  object-fit: contain;
  border-radius: 10px;
  background: #fff;
  padding: 3px;
  box-shadow: 0 6px 18px rgba(0, 0, 0, 0.18);
}

.footer-support p,
.footer-legal p {
  color: var(--text-2);
  font-size: 0.92rem;
  margin-bottom: 10px;
}

.footer-disclaimer {
  max-width: 420px;
}

.footer h5 {
  color: var(--text-0);
  font-size: 0.95rem;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.footer ul {
  list-style: none;
}

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

.footer li a {
  color: var(--text-2);
  font-size: 0.92rem;
  transition: color 0.2s;
}

.footer li a:hover {
  color: var(--accent);
}

.footer-bottom {
  padding-top: 28px;
  border-top: 1px solid var(--border);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px 24px;
  color: var(--text-3);
  font-size: 0.85rem;
}

.footer-resp {
  font-size: 0.82rem;
  color: var(--text-3);
  text-align: right;
}

.footer-resp strong {
  color: var(--text-1);
  font-weight: 600;
  letter-spacing: 0.01em;
}

/* ===== Banner i18n em artigos ===== */
.article-i18n-banner {
  display: flex;
  align-items: center;
  gap: 14px;
  background: linear-gradient(135deg, var(--info-glow), transparent);
  border: 1px solid var(--info);
  border-radius: var(--radius);
  padding: 14px 18px;
  margin-bottom: 24px;
  flex-wrap: wrap;
}

.article-i18n-banner .banner-icon {
  font-size: 1.2rem;
}

.article-i18n-banner .banner-text {
  flex: 1;
  color: var(--text-1);
  font-size: 0.92rem;
  min-width: 200px;
}

.article-i18n-banner .banner-action {
  background: var(--info);
  color: var(--bg-0);
  border: none;
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.15s;
}

.article-i18n-banner .banner-action:hover {
  opacity: 0.88;
}

/* Esconde banner quando idioma é pt-BR */
html[lang="pt-BR"] .article-i18n-banner {
  display: none;
}

/* ===== Mobile ===== */
@media (max-width: 860px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 72px;
    left: 0;
    right: 0;
    background: var(--bg-1);
    border-bottom: 1px solid var(--border);
    flex-direction: column;
    padding: 16px;
    gap: 4px;
  }

  .nav-links.open {
    display: flex;
  }

  .nav-links a {
    display: block;
    padding: 12px 16px;
  }

  .mobile-toggle {
    display: grid;
    place-items: center;
  }

  .nav-cta .btn-primary {
    display: none;
  }

  .lang-switch {
    padding: 2px;
  }

  .lang-pill {
    padding: 5px 8px;
    font-size: 0.74rem;
    min-width: 30px;
  }

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

  .footer-shell {
    grid-template-columns: 1fr;
  }

  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }

  .hero {
    padding: 60px 0 80px;
  }
}

@media (max-width: 500px) {
  .footer-grid {
    grid-template-columns: 1fr;
  }

  .footer-resp {
    text-align: left;
  }
}

/* ===== Pricing ===== */
.pricing-section {
  scroll-margin-top: 88px;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
  gap: 24px;
  max-width: 920px;
  margin: 0 auto;
}

.pricing-card {
  position: relative;
  background: var(--bg-1);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 36px 32px 32px;
  display: flex;
  flex-direction: column;
  transition: transform 0.2s, border-color 0.2s, box-shadow 0.2s;
}

.pricing-card:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
}

.pricing-card-featured {
  background: linear-gradient(155deg, var(--bg-2), var(--bg-1));
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-soft), 0 18px 50px rgba(0, 0, 0, 0.4);
}

.pricing-card-featured:hover {
  border-color: var(--accent);
  box-shadow: 0 0 0 1px var(--accent-glow), 0 22px 60px rgba(0, 0, 0, 0.5);
}

.pricing-badge {
  display: inline-flex;
  align-self: flex-start;
  padding: 5px 12px;
  border-radius: 999px;
  background: var(--bg-3);
  color: var(--text-2);
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-bottom: 18px;
}

.pricing-badge-featured {
  background: var(--accent);
  color: var(--bg-0);
}

.pricing-name {
  color: var(--text-0);
  font-size: 1.4rem;
  margin-bottom: 12px;
}

.pricing-price {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--border);
}

.pricing-amount {
  font-family: var(--font-mono);
  font-size: 2.4rem;
  font-weight: 700;
  color: var(--text-0);
  letter-spacing: -0.02em;
}

.pricing-card-featured .pricing-amount {
  color: var(--accent);
}

.pricing-note {
  color: var(--text-3);
  font-size: 0.88rem;
}

.pricing-features {
  list-style: none;
  margin: 0 0 28px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
}

.pricing-features li {
  position: relative;
  padding-left: 28px;
  color: var(--text-1);
  font-size: 0.95rem;
  line-height: 1.5;
}

.pricing-features li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--accent-soft);
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2300ff88' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><polyline points='20 6 9 17 4 12'/></svg>");
  background-size: 11px 11px;
  background-position: center;
  background-repeat: no-repeat;
}

.pricing-cta {
  width: 100%;
  justify-content: center;
}

.pricing-disclaimer {
  margin-top: 14px;
  margin-bottom: 0;
  color: var(--text-3);
  font-size: 0.82rem;
  text-align: center;
}

@media (max-width: 720px) {
  .pricing-card {
    padding: 28px 22px 24px;
  }

  .pricing-amount {
    font-size: 2rem;
  }
}

/* ===== Animations ===== */
.fade-up {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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