/* ============================================================
   CAPITAL FLOW — Landing Page Styles
   Dark Mode | Vanilla CSS | Zero Dependencies
   ============================================================ */

/* ── Variáveis Globais ─────────────────────────────────────── */
:root {
  /* Cores — Dark Mode (ChatGPT-inspired) */
  --bg-primary: #171717;
  --bg-secondary: #212121;
  --bg-surface: #212121;
  --bg-card: #1E1E1E;
  --bg-pill: #2F2F2F;
  --border-subtle: #303030;
  --border-medium: #383838;

  --text-primary: #FFFFFF;
  --text-secondary: #B4B4B4;
  --text-muted: #8E8E93;
  --text-disabled: #636366;

  --accent-blue: #3B82F6;
  --accent-blue-light: #60A5FA;
  --accent-blue-dark: #1D4ED8;
  --accent-green: #10A37F;
  --accent-warning: #F59E0B;
  --accent-red: #EF4444;

  /* Tipografia fluida com clamp() */
  --fs-hero: clamp(2rem, 4vw + 0.5rem, 3.5rem);
  --fs-h2: clamp(1.5rem, 2.5vw + 0.5rem, 2.25rem);
  --fs-body: clamp(0.938rem, 1vw + 0.375rem, 1.063rem);
  --fs-small: clamp(0.813rem, 0.8vw + 0.25rem, 0.938rem);
  --fs-xs: 0.75rem;

  /* Espaçamentos */
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;

  /* Layout */
  --max-width: 1280px;
  --header-height: 64px;
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;

  /* Transições */
  --transition-fast: 200ms ease;
  --transition-base: 300ms ease-in-out;
  --transition-slow: 500ms ease;
}

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

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: 'SF Pro Text', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  font-size: var(--fs-body);
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-family: 'SF Pro Display', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
  font-weight: 500;
  line-height: 1.2;
}

a {
  color: inherit;
  text-decoration: none;
}

ul { list-style: none; }

img, svg { display: block; max-width: 100%; }

/* Foco visível para acessibilidade */
:focus-visible {
  outline: 2px solid var(--accent-blue-light);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ── Container ────────────────────────────────────────────── */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--space-lg);
  padding-right: var(--space-lg);
}

/* ── Header / Navegação ───────────────────────────────────── */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--header-height);
  background: rgba(23, 23, 23, 0.6);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: background var(--transition-base), border-color var(--transition-base);
}

.site-header.scrolled {
  background: rgba(23, 23, 23, 0.92);
  border-bottom-color: var(--border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  flex-shrink: 0;
}

.logo-text {
  font-family: 'SF Pro Display', system-ui, sans-serif;
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.02em;
}

/* Navegação Desktop */
.nav-desktop {
  display: flex;
  align-items: center;
}

.nav-list {
  display: flex;
  gap: var(--space-xl);
}

.nav-link {
  font-size: var(--fs-small);
  font-weight: 500;
  color: var(--text-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
  position: relative;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 50%;
  transform: translateX(-50%) scaleX(0);
  width: 60%;
  height: 2px;
  background: var(--accent-blue-light);
  border-radius: 1px;
  transition: transform var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus-visible {
  color: var(--text-primary);
}

.nav-link:hover::after,
.nav-link:focus-visible::after {
  transform: translateX(-50%) scaleX(1);
}

/* Hambúrguer */
.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 40px;
  height: 40px;
  background: none;
  border: none;
  cursor: pointer;
  gap: 5px;
  padding: 0;
}

.hamburger-line {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: transform var(--transition-base), opacity var(--transition-fast);
}

.hamburger[aria-expanded="true"] .hamburger-line:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(2) {
  opacity: 0;
}
.hamburger[aria-expanded="true"] .hamburger-line:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* Menu Mobile */
.nav-mobile {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background: rgba(23, 23, 23, 0.97);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border-subtle);
  padding: var(--space-lg) 0;
  transform: translateY(-100%);
  opacity: 0;
  pointer-events: none;
  transition: transform var(--transition-base), opacity var(--transition-base);
}

.nav-mobile.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: auto;
}

.nav-mobile .nav-list {
  flex-direction: column;
  align-items: center;
  gap: var(--space-md);
}

.mobile-nav-link {
  font-size: 1.125rem;
  padding: var(--space-sm) var(--space-lg);
}

/* ── Hero Section ─────────────────────────────────────────── */
.hero {
  padding-top: calc(var(--header-height) + var(--space-3xl));
  padding-bottom: var(--space-3xl);
  text-align: center;
}

.hero-headline {
  font-size: var(--fs-hero);
  font-weight: 500;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  margin-bottom: var(--space-md);
}

.hero-subheadline {
  font-size: clamp(1rem, 1.5vw + 0.25rem, 1.25rem);
  font-weight: 400;
  color: var(--text-secondary);
  margin-bottom: var(--space-xl);
}

.hero-context {
  max-width: 720px;
  margin: 0 auto var(--space-2xl);
  font-size: var(--fs-body);
  color: var(--text-muted);
  line-height: 1.75;
}

/* ── Gráfico ──────────────────────────────────────────────── */
.chart-wrapper {
  margin-top: var(--space-xl);
}

.chart-container {
  position: relative;
  width: 100%;
  height: 420px;
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.chart-container canvas {
  width: 80% !important;
  height: 100% !important;
}

/* Tooltip do gráfico */
.chart-tooltip {
  position: absolute;
  pointer-events: none;
  background: rgba(30, 41, 59, 0.95);
  backdrop-filter: blur(8px);
  border: 1px solid var(--border-medium);
  border-radius: var(--radius-sm);
  padding: var(--space-sm) var(--space-md);
  font-size: var(--fs-xs);
  color: var(--text-primary);
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity var(--transition-fast), transform var(--transition-fast);
  z-index: 10;
  line-height: 1.5;
}

.chart-tooltip.visible {
  opacity: 1;
  transform: translateY(0);
}

.chart-tooltip .tt-year {
  font-weight: 600;
  color: var(--accent-blue-light);
  margin-bottom: 2px;
}

.chart-tooltip .tt-row {
  display: flex;
  justify-content: space-between;
  gap: var(--space-lg);
}

.chart-tooltip .tt-note {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px solid var(--border-medium);
  color: var(--text-muted);
  font-style: italic;
  font-size: 0.688rem;
}

/* Legenda */
.chart-legend {
  display: flex;
  justify-content: center;
  gap: var(--space-xl);
  margin-top: var(--space-lg);
  flex-wrap: wrap;
}

.legend-item {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-xs);
  color: var(--text-secondary);
}

.legend-swatch {
  width: 12px;
  height: 12px;
  border-radius: 3px;
  flex-shrink: 0;
}

.legend-vol { background: var(--accent-blue); }
.legend-rate { background: var(--accent-green); }
.legend-proj {
  background: var(--accent-blue);
  opacity: 0.5;
  border: 1px dashed var(--accent-blue-light);
}

/* ── Seção de Cards ───────────────────────────────────────── */
.cards-section {
  padding: var(--space-3xl) 0;
}

.cards-heading {
  font-size: var(--fs-h2);
  text-align: center;
  margin-bottom: var(--space-md);
  letter-spacing: -0.02em;
}

.cards-intro {
  text-align: center;
  max-width: 640px;
  margin: 0 auto var(--space-2xl);
  color: var(--text-muted);
  font-size: var(--fs-body);
  line-height: 1.7;
}

.cards-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-lg);
}

/* Card individual */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.card:hover {
  border-color: var(--border-medium);
}

.card-toggle {
  width: 100%;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  text-align: left;
}

/* Estado compacto */
.card-compact {
  display: flex;
  align-items: center;
  gap: var(--space-md);
  padding: var(--space-lg);
  min-height: 64px;
}

.card-icon {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
}

.card-title {
  font-family: 'SF Pro Display', system-ui, sans-serif;
  font-size: 1.063rem;
  font-weight: 500;
  color: var(--text-primary);
  flex-grow: 1;
}

.card-mini-indicators {
  display: flex;
  gap: var(--space-sm);
  margin-right: auto;
}

.mini-indicator {
  font-size: 0.688rem;
  color: var(--text-muted);
  background: var(--bg-pill);
  padding: 2px 8px;
  border-radius: 999px;
  white-space: nowrap;
}

.card-chevron {
  flex-shrink: 0;
  transition: transform var(--transition-base);
}

.card-toggle[aria-expanded="true"] .card-chevron {
  transform: rotate(180deg);
}

/* Corpo expandido */
.card-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition-base), opacity var(--transition-base);
  opacity: 0;
}

.card-toggle[aria-expanded="true"] + .card-body {
  max-height: 500px;
  opacity: 1;
}

/* Cartão de crédito (estado expandido) */
.credit-card {
  padding: var(--space-lg);
  background: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f3460 100%);
  border-top: 1px solid var(--border-subtle);
  position: relative;
  overflow: hidden;
}

.credit-card::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 200px;
  height: 200px;
  background: radial-gradient(circle, rgba(96, 165, 250, 0.08) 0%, transparent 70%);
  border-radius: 50%;
  pointer-events: none;
}

.credit-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-lg);
  position: relative;
  z-index: 1;
}

.cc-label {
  font-size: var(--fs-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-blue-light);
}

.cc-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  position: relative;
  z-index: 1;
}

.cc-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.cc-full {
  grid-column: 1 / -1;
}

.cc-label-sm {
  font-size: 0.688rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.cc-value {
  font-family: 'SF Pro Display', system-ui, sans-serif;
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-primary);
}

.cc-positive { color: var(--accent-green); }
.cc-warning { color: var(--accent-warning); }
.cc-negative { color: var(--accent-red); }

/* ── Footer ───────────────────────────────────────────────── */
.site-footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border-subtle);
  padding: var(--space-xl) 0;
  margin-top: var(--space-2xl);
}

.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-md);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  font-size: var(--fs-small);
  font-weight: 600;
  color: var(--text-secondary);
}

.footer-nav {
  display: flex;
  gap: var(--space-lg);
}

.footer-nav a {
  font-size: var(--fs-xs);
  color: var(--text-muted);
  transition: color var(--transition-fast);
}

.footer-nav a:hover,
.footer-nav a:focus-visible {
  color: var(--text-primary);
}

.footer-copyright {
  font-size: var(--fs-xs);
  color: var(--text-disabled);
}

/* ── Responsividade ───────────────────────────────────────── */

/* Tablet: até 1024px */
@media (max-width: 1024px) {
  .cards-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-md);
  }

  .chart-container {
    height: 360px;
  }

  .mini-indicator {
    display: none;
  }
}

/* Mobile: até 768px */
@media (max-width: 768px) {
  :root {
    --header-height: 56px;
  }

  /* Header mobile */
  .hamburger {
    display: flex;
  }

  .nav-desktop {
    display: none;
  }

  .logo-text {
    font-size: 1rem;
  }

  /* Hero */
  .hero {
    padding-top: calc(var(--header-height) + var(--space-2xl));
    padding-bottom: var(--space-2xl);
  }

  .hero-context {
    font-size: 0.938rem;
  }

  /* Gráfico */
  .chart-container {
    height: 320px;
  }

  .chart-legend {
    gap: var(--space-md);
  }

  /* Cards */
  .cards-grid {
    grid-template-columns: 1fr;
    gap: var(--space-md);
  }

  .card-compact {
    padding: var(--space-md);
  }

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

  /* Footer */
  .footer-inner {
    flex-direction: column;
    text-align: center;
    gap: var(--space-sm);
  }

  .footer-nav {
    order: -1;
  }
}

/* Mobile pequeno: até 480px */
@media (max-width: 480px) {
  .container {
    padding-left: var(--space-md);
    padding-right: var(--space-md);
  }

  .chart-container {
    height: 280px;
  }

  .hero-headline {
    font-size: clamp(1.5rem, 6vw + 0.5rem, 2.5rem);
  }
}

/* ── Animações de entrada (scroll) ────────────────────────── */
.fade-in {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

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

/* ── Redução de movimento (prefers-reduced-motion) ─────────── */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }

  html { scroll-behavior: auto; }

  .fade-in {
    opacity: 1;
    transform: none;
  }
}