/* =========================================================
   - Paleta (8+ cores), tipografia (5+ tamanhos),
     espaçamento modular, radius, sombra, breakpoints
   ========================================================= */
:root {
  /* Paleta principal (brand) */
  --brand-50:  #eff6ff;
  --brand-100: #dbeafe;
  --brand-200: #bfdbfe;
  --brand-300: #93c5fd;
  --brand-400: #60a5fa;
  --brand-500: #3b82f6;
  --brand-600: #2563eb; /* principal */
  --brand-700: #1d4ed8;

  /* Secundária (accent) */
  --accent-100: #f5d0fe;
  --accent-300: #e879f9;
  --accent-600: #c026d3;

  /* Neutras */
  --neutral-50:  #f8fafc;
  --neutral-100: #f1f5f9;
  --neutral-200: #e2e8f0;
  --neutral-300: #cbd5e1;
  --neutral-400: #94a3b8;
  --neutral-500: #64748b;
  --neutral-600: #475569;
  --neutral-700: #334155;
  --neutral-900: #0f172a;

  /* Semânticas */
  --success-500: #16a34a;
  --warning-500: #f59e0b;
  --danger-500:  #ef4444;
  --info-500:    #0ea5e9;

  /* Cores de superfície e texto */
  --bg:              #ffffff;
  --panel:           #f3f4f6;
  --text:            #1f2937;
  --muted:           #4b5563;
  --brand:           var(--brand-600);
  --brand-contrast:  #ffffff;

  /* Tipografia (5+ tamanhos) */
  --fs-xxl: clamp(2rem, 3vw, 2.5rem);
  --fs-xl:  1.75rem;
  --fs-lg:  1.25rem;
  --fs-md:  1rem;
  --fs-sm:  .875rem;
  --fs-xs:  .75rem;

  /* Espaçamento modular (8,16,24,32,48,64) */
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-5: 48px;
  --space-6: 64px;

  /* Outros tokens */
  --radius:     12px;
  --radius-sm:  8px;
  --shadow:     0 8px 24px rgba(0,0,0,.08);

  /* Breakpoints (5) */
  --bp-xs: 480px;
  --bp-sm: 640px;
  --bp-md: 768px;
  --bp-lg: 1024px;
  --bp-xl: 1280px;
}

/* =========================================================
   Base / Reset acessível
   ========================================================= */
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell, Arial;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  font-size: var(--fs-md);
}
img { max-width: 100%; display: block; }
a { color: var(--brand); text-underline-offset: 2px; }
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 3px solid var(--brand-300);
  outline-offset: 2px;
}
.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: var(--space-2);
}

/* =========================================================
   Tipografia utilitária
   ========================================================= */
h1, h2, h3 { line-height: 1.25; }
h1 { font-size: var(--fs-xxl); margin: 0 0 var(--space-1); }
h2 { font-size: var(--fs-xl);  margin: var(--space-3) 0 var(--space-1); }
h3 { font-size: var(--fs-lg);  margin: var(--space-2) 0 var(--space-1); }
p  { margin: var(--space-1) 0 var(--space-2); }
.subtitle { font-size: var(--fs-lg); margin: 0 0 var(--space-1); color: var(--muted); }

/* =========================================================
   Layout principal (Grid + Flex)
   - Grid 12 colunas customizado
   ========================================================= */
.row {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--space-2);
}
[class^="col-"] { grid-column: span 12; } /* mobile padrão */

@media (min-width: var(--bp-sm)) {
  .col-sm-3  { grid-column: span 3; }
  .col-sm-4  { grid-column: span 4; }
  .col-sm-6  { grid-column: span 6; }
  .col-sm-8  { grid-column: span 8; }
  .col-sm-12 { grid-column: span 12; }
}
@media (min-width: var(--bp-lg)) {
  .col-3 { grid-column: span 3; }
  .col-4 { grid-column: span 4; }
  .col-6 { grid-column: span 6; }
  .col-8 { grid-column: span 8; }
  .col-12 { grid-column: span 12; }
}

/* Grids utilitários simples */
.grid { display: grid; gap: var(--space-2); grid-template-columns: 1fr; }
@media (min-width: var(--bp-md)) {
  .grid-2 { grid-template-columns: repeat(2, 1fr); }
  .grid-3 { grid-template-columns: repeat(3, 1fr); }
}

/* Flex helpers */
.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-1 { gap: var(--space-1); }
.gap-2 { gap: var(--space-2); }

/* =========================================================
   Header / Navegação (hambúrguer + dropdown)
   ========================================================= */
.header {
  background: var(--neutral-900);
  color: #e5e7eb;
}
.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: .75rem 0;
}
.brand {
  display: flex;
  align-items: center;
  gap: .75rem;
  font-weight: 700;
  letter-spacing: .3px;
}

/* Links */
.header nav a {
  color: #e5e7eb;
  text-decoration: none;
  padding: .5rem .75rem;
  border-radius: .5rem;
}
.header nav a:hover,
.header nav a:focus {
  background: #1f2937;
}

/* Container do menu (para mobile) */
.nav { position: relative; }
.nav__links {
  display: flex;
  align-items: center;
  gap: .25rem;
}
.nav__toggle {
  background: transparent;
  border: 0;
  color: #e5e7eb;
  font-size: 1.5rem;
  display: none; /* mobile-only */
  cursor: pointer;
}

/* Dropdown */
.dropdown { position: relative; }
.dropdown__btn {
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  background: transparent;
  border: 1px solid var(--neutral-700);
  color: #e5e7eb;
  padding: .45rem .7rem;
  border-radius: .5rem;
  cursor: pointer;
}
.dropdown__menu {
  position: absolute;
  top: 100%; left: 0;
  background: #fff; color: var(--text);
  border: 1px solid var(--neutral-200);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  padding: .25rem;
  min-width: 220px;
  transform-origin: top left;
  opacity: 0; visibility: hidden;
  transform: translateY(-6px);
  z-index: 20;
}
.dropdown__menu a {
  color: var(--text);
  display: block;
  padding: .5rem .75rem;
  border-radius: .5rem;
}
.dropdown__menu a:hover { background: var(--neutral-100); }
.dropdown[aria-expanded="true"] .dropdown__menu {
  opacity: 1; visibility: visible; transform: translateY(0);
}

/* Mobile: hambúrguer + menu vertical */
@media (max-width: calc(var(--bp-md) - 1px)) {
  .nav__toggle { display: block; }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%; right: 0;
    background: var(--neutral-900);
    padding: .5rem;
    border-radius: var(--radius);
    width: 85vw; max-width: 340px;
    flex-direction: column;
    align-items: stretch;
  }
  .nav--open .nav__links { display: flex; }
  .dropdown__menu {
    position: relative;
    box-shadow: none;
    border: 0;
    background: transparent;
    color: #e5e7eb;
    padding: 0;
  }
  .dropdown__menu a { color: #e5e7eb; }
}

/* =========================================================
   Seções principais
   ========================================================= */
.hero {
  background: linear-gradient(180deg, var(--brand-100) 0%, #fff 100%);
  padding: var(--space-4) 0;
}
.hero figure { margin: 0; }
.hero img {
  width: 100%;
  height: auto;
  border-radius: .75rem;
  box-shadow: 0 8px 24px rgba(0,0,0,.08);
}

.footer {
  border-top: 1px solid var(--neutral-200);
  padding: var(--space-4) 0;
  color: var(--muted);
  font-size: .95rem;
}

/* =========================================================
   Cards, Badges, Tags
   ========================================================= */
.card {
  background: var(--panel);
  border-radius: .75rem;
  padding: var(--space-2);
  box-shadow: 0 6px 16px rgba(0,0,0,.06);
}
.card img {
  width: 100%;
  height: auto;
  border-radius: .5rem;
}

.badges { display: flex; gap: .5rem; flex-wrap: wrap; }
.badge {
  display: inline-block;
  padding: .25rem .5rem;
  border-radius: 100px;
  font-size: var(--fs-sm);
  background: var(--neutral-200);
  color: var(--neutral-700);
}
.badge--brand   { background: var(--brand-100);   color: var(--brand-700); }
.badge--success { background: #dcfce7; color: #166534; }
.badge--warning { background: #fef3c7; color: #92400e; }
.badge--danger  { background: #fee2e2; color: #7f1d1d; }

/* =========================================================
   Botões (estados: hover, focus, active, disabled)
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  gap: .5rem;
  background: var(--brand);
  color: var(--brand-contrast);
  padding: .75rem 1rem;
  border-radius: .5rem;
  text-decoration: none;
  border: 0;
  cursor: pointer;
}
.btn:hover { filter: brightness(.95); }
.btn:focus { outline: 3px solid var(--brand-300); outline-offset: 2px; }
.btn:active { transform: translateY(1px); }
.btn:disabled { opacity: .6; cursor: not-allowed; }

.btn--primary   { background: var(--brand); color: var(--brand-contrast); }
.btn--secondary { background: var(--neutral-200); color: var(--text); }
.btn--ghost     { background: transparent; border: 1px solid var(--neutral-300); color: var(--text); }
.btn--danger    { background: var(--danger-500); color: #fff; }

/* =========================================================
   Formulários + Validação visual
   ========================================================= */
form { display: grid; gap: var(--space-2); }
fieldset {
  border: 1px solid var(--neutral-200);
  border-radius: .75rem;
  padding: var(--space-2);
}
legend { padding: 0 .5rem; font-weight: 600; }
.label { display: block; font-weight: 600; margin-bottom: .25rem; }

input, select, textarea {
  width: 100%;
  padding: .65rem .75rem;
  border: 1px solid var(--neutral-300);
  border-radius: var(--radius-sm);
  font-size: 1rem;
  background: #fff;
}
input::placeholder { color: #9ca3af; }
.helper { font-size: var(--fs-sm); color: var(--muted); }
.required { color: var(--danger-500); }

/* Estados de validação (nativa) */
input:required:invalid,
select:required:invalid,
textarea:required:invalid {
  border-color: var(--danger-500);
  background: #fff1f1;
}
input:required:valid,
select:required:valid,
textarea:required:valid {
  border-color: var(--success-500);
  background: #f0fdf4;
}

/* =========================================================
   Feedback (alerts, toasts, modals)
   ========================================================= */
.alert {
  border-radius: var(--radius);
  padding: var(--space-2);
  margin: var(--space-2) 0;
}
.alert--info    { background: #e0f2fe; color: #075985; }
.alert--success { background: #dcfce7; color: #166534; }
.alert--warning { background: #fef9c3; color: #92400e; }
.alert--danger  { background: #fee2e2; color: #7f1d1d; }

/* Toast (aparece no canto inferior) */
.toast {
  position: fixed;
  right: var(--space-2);
  bottom: var(--space-2);
  background: #111827;
  color: #fff;
  padding: .75rem 1rem;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  opacity: 0;
  transform: translateY(12px);
  pointer-events: none;
  transition: .25s ease;
  z-index: 50;
}
.toast--show {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}

/* Modal */
.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.5);
  display: none;
  align-items: center;
  justify-content: center;
  padding: var(--space-2);
  z-index: 40;
}
.modal {
  background: #fff;
  color: var(--text);
  border-radius: var(--radius);
  max-width: 560px;
  width: 100%;
  padding: var(--space-3);
  box-shadow: var(--shadow);
}
.modal header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-1);
}
.modal[aria-hidden="true"] { display: none; }
.modal-backdrop[aria-hidden="false"] { display: flex; }

/* =========================================================
   Utilitários de espaçamento e alinhamento
   ========================================================= */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.p-2  { padding: var(--space-2); }
.p-3  { padding: var(--space-3); }
.text-center { text-align: center; }
.text-muted  { color: var(--muted); }

/* =========================================================
   Breakpoints (reforço tipografia/layout em telas maiores)
   ========================================================= */
@media (min-width: var(--bp-md)) {
  .navbar { padding: 1rem 0; }
  h1 { font-size: 2.25rem; } /* maior no md+ */
}

.visually-hidden {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0;
}

.nav { position: relative; }

/* Mobile: por padrão o menu fica fechado */
@media (max-width: 767.98px) {
  .nav__toggle {               /* botão hambúrguer */
    display: inline-block;
    background: transparent;
    border: 0;
    color: #e5e7eb;
    font-size: 1.5rem;
    cursor: pointer;
    margin-left: auto;
  }
  .nav__links {
    display: none;
    position: absolute;
    top: 100%;
    right: 0;
    background: #0f172a;       /* neutral-900 */
    padding: .5rem;
    border-radius: 12px;        /* radius */
    width: 85vw;
    max-width: 340px;
    flex-direction: column;
    align-items: stretch;
    gap: .25rem;
  }
  /* Quando o checkbox está marcado, abre o menu */
  #nav-open:checked ~ .nav__links {
    display: flex;
  }

  /* Dropdown no mobile: deixa o "submenu" com visual embutido */
  .dropdown__menu {
    border: 0; box-shadow: none; background: transparent; padding: 0;
  }
  .dropdown__menu a { color: #e5e7eb; }
}

/* Desktop: links inline e toggle escondido */
@media (min-width: 768px) {
  .nav__toggle { display: none; }
  .nav__links {
    display: flex; align-items: center; gap: .25rem;
    position: static; width: auto; background: transparent; padding: 0;
  }
}

/* ====== Dropdown sem JS (details/summary) ====== */
.dropdown {
  position: relative;
}
.dropdown > summary.dropdown__btn {
  list-style: none;          /* remove marcador do summary */
  display: inline-flex;
  align-items: center;
  gap: .25rem;
  background: transparent;
  border: 1px solid #334155; /* neutral-700 */
  color: #e5e7eb;
  padding: .45rem .7rem;
  border-radius: .5rem;
  cursor: pointer;
}
.dropdown > summary::-webkit-details-marker { display: none; } /* Safari/Chrome */

/* Painel do submenu (desktop) */
@media (min-width: 768px) {
  .dropdown__menu {
    position: absolute;
    top: 100%; left: 0;
    background: #fff; color: #1f2937;  /* text */
    border: 1px solid #e2e8f0;         /* neutral-200 */
    border-radius: 8px;
    box-shadow: 0 8px 24px rgba(0,0,0,.08);
    padding: .25rem;
    min-width: 220px;
    transform-origin: top left;
    transform: translateY(-6px);
    opacity: 0; visibility: hidden;
    z-index: 20;
  }
  .dropdown__menu a {
    display: block; padding: .5rem .75rem; border-radius: .5rem;
    color: inherit; text-decoration: none;
  }
  .dropdown__menu a:hover { background: #f1f5f9; } /* neutral-100 */

  /* Quando o details está aberto, mostra o menu */
  .dropdown[open] .dropdown__menu {
    opacity: 1; visibility: visible; transform: translateY(0);
  }
}


/* =========================================================
   Tema Escuro (modo acessível)
   ========================================================= */
.dark {
  --bg: #0f172a;
  --panel: #1e293b;
  --text: #f1f5f9;
  --muted: #cbd5e1;
  --brand: #60a5fa;
  --brand-contrast: #0f172a;
}

.dark body {
  background: var(--bg);
  color: var(--text);
}

.dark .header {
  background: #1e293b;
  color: var(--text);
}

.dark .card {
  background: var(--panel);
  color: var(--text);
}

.dark .footer {
  border-top: 1px solid #334155;
  color: var(--muted);
}