/* ============================= */
/*          Design tokens        */
/* ============================= */
:root {
  --bg: #0e0e14;
  --surface: #151520;
  --surface-2: #1a1a26;
  --text: #ffffff;
  --muted: rgba(255,255,255,0.72);
  --border: #2c2c3a;
  --primary: #2a7bff;
  --focus: #00aaff;
}

html, body {
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Noto Sans, Ubuntu, Cantarell, Helvetica Neue, Arial, "Apple Color Emoji", "Segoe UI Emoji";
  line-height: 1.5;
}

/* ============================= */
/*     Acessibilidade global     */
/* ============================= */
#skip-link {
  position: absolute;
  left: -9999px;
  z-index: 9999;
  padding: 1rem;
  background-color: #111;
  color: #fff;
  border: 2px solid var(--focus);
  border-radius: .5rem;
  opacity: 0;
}
#skip-link:focus {
  left: 50%;
  transform: translateX(-50%);
  opacity: 1;
}

:focus-visible {
  outline: 3px solid var(--focus) !important;
  outline-offset: 3px !important;
  box-shadow: 0 0 0 3px rgba(26, 136, 255, 0.40) !important;
  border-radius: 4px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation: none !important; transition: none !important; scroll-behavior: auto !important; }
}

/* Responsividade para botões de controle em mobile */
@media (max-width: 575.98px) {
  .btn.rounded-pill {
    font-size: 0.875rem;
    padding: 0.5rem 0.75rem;
  }

  .btn .material-symbols-outlined {
    font-size: 1.25rem;
  }

  #modo-visualizacao-label,
  #cores-visualizacao-label,
  #periodos-nav-label,
  #grupos-nav-label,
  #categorias-nav-label,
  #acoes-rapidas-label {
    font-size: 0.875rem !important;
  }
}

/* ============================= */
/*            Header             */
/* ============================= */
header[role="banner"] {
  padding: 4rem 1rem;
  border-bottom: 1px solid rgba(255,255,255,0.18);
  text-align: center;
  position: relative;
  overflow: hidden;
  isolation: isolate;
}
header h1 { font-weight: 800; letter-spacing: .2px; }
header .lead { max-width: 56rem; margin: 0 auto; color: var(--muted); }
header .btn {
  border-radius: 999px;
  margin: .25rem;
  transition: transform .2s ease, background-color .2s ease;
}

/* Botões do dashboard: preservar estilos Bootstrap e garantir texto branco legível */
header .bg-dark .btn {
  color: #ffffff;
}
header .bg-dark .btn.btn-primary {
  background-color: #2570eb;
  border-color: #2570eb;
  color: #ffffff;
}
header .bg-dark .btn.btn-primary:hover,
header .bg-dark .btn.btn-primary:focus-visible {
  background-color: #1d63d4;
  border-color: #1d63d4;
  color: #ffffff;
  transform: translateY(-1px);
}
header .bg-dark .btn.btn-outline-light {
  color: #ffffff;
  border-color: rgba(255,255,255,.6);
  background-color: transparent;
}
header .bg-dark .btn.btn-outline-light:hover,
header .bg-dark .btn.btn-outline-light:focus-visible {
  background-color: rgba(255,255,255,0.15);
  color: #ffffff;
  border-color: rgba(255,255,255,.8);
  transform: translateY(-1px);
}
header .bg-dark a.btn {
  color: #ffffff;
}
header .bg-dark a.btn:hover,
header .bg-dark a.btn:focus-visible {
  background-color: rgba(255,255,255,0.15);
  color: #ffffff;
  transform: translateY(-1px);
}

.feature-card {
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 1rem;
  padding: 1.5rem;
  transition: transform .3s, box-shadow .3s;
}
.feature-card:hover { transform: translateY(-5px); box-shadow: 0 10px 20px rgba(0,0,0,0.15); }

/* Camadas decorativas não capturam clique */
.decorative-overlay { position: absolute; inset: 0; pointer-events: none; }
.header-particles .particle { pointer-events: none; }

/* ============================= */
/*   Botões/elementos (JS ext.)  */
/* ============================= */
.btn-elemento {
  border-radius: 1rem;
  margin: .5rem;
  padding: 1rem;
  min-height: 180px;
  background: linear-gradient(145deg, var(--surface-2), #13131c);
  border: 1px solid var(--border);
  transition: transform .18s ease, border-color .18s ease, box-shadow .18s ease;
}
.btn-elemento:hover { transform: translateY(-4px); border-color: var(--focus); box-shadow: 0 10px 24px rgba(0,0,0,.35); }
.btn-elemento:focus-visible { outline: 3px solid var(--focus); outline-offset: 4px; }

/* Cores para elementos químicos - com contraste adequado para baixa visão */
.color-mode-active .elemento-hidrogenio {
  background: #ffffff;
  color: #000000;
  border-color: #555555;
}
.color-mode-active .elemento-alcalino {
  background: #9d4edd;
  color: #ffffff;
  text-shadow: 0px 1px 2px rgba(0,0,0,0.5);
}
.color-mode-active .elemento-alcalino-terroso {
  background: #5e789b;
  color: #ffffff;
  text-shadow: 0px 1px 2px rgba(0,0,0,0.5);
}
.color-mode-active .elemento-transicao {
  background: #ffcc00;
  color: #000000;
  text-shadow: 0px 1px 1px rgba(255,255,255,0.5);
}
.color-mode-active .elemento-lantanideo {
  background: #ff7f50;
  color: #000000;
  text-shadow: 0px 1px 1px rgba(255,255,255,0.5);
}
.color-mode-active .elemento-actinideo {
  background: #ffa07a;
  color: #000000;
  text-shadow: 0px 1px 1px rgba(255,255,255,0.5);
}
.color-mode-active .elemento-nao-metal {
  background: #5a8142;
  color: #ffffff;
  text-shadow: 0px 1px 2px rgba(0,0,0,0.5);
}
.color-mode-active .elemento-semimetal {
  background: #e42735;
  color: #ffffff;
  text-shadow: 0px 1px 2px rgba(0,0,0,0.5);
}
.color-mode-active .elemento-metal-representativo {
  background: #ffe066;
  color: #000000;
  text-shadow: 0px 1px 1px rgba(255,255,255,0.5);
}
.color-mode-active .elemento-gas-nobre {
  background: #00b4d8;
  color: #000000;
  text-shadow: 0px 1px 1px rgba(255,255,255,0.5);
}

/* Cores para modais com contraste adequado */
.color-mode-active .modal-hidrogenio .modal-content {
  background: linear-gradient(145deg, #ffffff, #f0f0f0);
  color: #000000;
  border-color: #555555;
}
.color-mode-active .modal-alcalino .modal-content {
  background: linear-gradient(145deg, #9d4edd, #8a3ec8);
  color: #ffffff;
}
.color-mode-active .modal-alcalino-terroso .modal-content {
  background: linear-gradient(145deg, #5e789b, #587192);
  color: #ffffff;
}
.color-mode-active .modal-transicao .modal-content {
  background: linear-gradient(145deg, #ffcc00, #e0b300);
  color: #000000;
}
.color-mode-active .modal-lantanideo .modal-content {
  background: linear-gradient(145deg, #ff7f50, #e67147);
  color: #000000;
}
.color-mode-active .modal-actinideo .modal-content {
  background: linear-gradient(145deg, #ffa07a, #e6906e);
  color: #000000;
}
.color-mode-active .modal-nao-metal .modal-content {
  background: linear-gradient(145deg, #5a8142, #54793e);
  color: #ffffff;
}
.color-mode-active .modal-semimetal .modal-content {
  background: linear-gradient(145deg, #e42735, #d81b2a);
  color: #ffffff;
}
.color-mode-active .modal-metal-representativo .modal-content {
  background: linear-gradient(145deg, #ffe066, #e6ca5c);
  color: #000000;
}
.color-mode-active .modal-gas-nobre .modal-content {
  background: linear-gradient(145deg, #00b4d8, #009ec0);
  color: #000000;
}

/* Melhorias de contraste para elementos específicos dentro das modais coloridas */
.color-mode-active .modal .btn-secondary {
  background-color: rgba(0, 0, 0, 0.2);
  border-color: rgba(0, 0, 0, 0.3);
  color: inherit;
}

/* Garantindo que os símbolos e nomes dos elementos sejam mais visíveis */
.color-mode-active .elemento-hidrogenio .fw-bolder,
.color-mode-active .elemento-transicao .fw-bolder,
.color-mode-active .elemento-lantanideo .fw-bolder,
.color-mode-active .elemento-actinideo .fw-bolder,
.color-mode-active .elemento-metal-representativo .fw-bolder,
.color-mode-active .elemento-gas-nobre .fw-bolder {
  color: #000000;
}

.color-mode-active .elemento-alcalino .fw-bolder,
.color-mode-active .elemento-alcalino-terroso .fw-bolder,
.color-mode-active .elemento-nao-metal .fw-bolder,
.color-mode-active .elemento-semimetal .fw-bolder {
  color: #ffffff;
}

/* Melhorando o contraste em estados de hover e focus */
.color-mode-active .elemento-hidrogenio:hover,
.color-mode-active .elemento-hidrogenio:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.3) !important;
  border-color: #000 !important;
}

.color-mode-active .elemento-transicao:hover,
.color-mode-active .elemento-lantanideo:hover,
.color-mode-active .elemento-actinideo:hover,
.color-mode-active .elemento-metal-representativo:hover,
.color-mode-active .elemento-gas-nobre:hover,
.color-mode-active .elemento-transicao:focus-visible,
.color-mode-active .elemento-lantanideo:focus-visible,
.color-mode-active .elemento-actinideo:focus-visible,
.color-mode-active .elemento-metal-representativo:focus-visible,
.color-mode-active .elemento-gas-nobre:focus-visible {
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.3) !important;
  filter: brightness(0.9);
}

.color-mode-active .elemento-alcalino:hover,
.color-mode-active .elemento-alcalino-terroso:hover,
.color-mode-active .elemento-nao-metal:hover,
.color-mode-active .elemento-semimetal:hover,
.color-mode-active .elemento-alcalino:focus-visible,
.color-mode-active .elemento-alcalino-terroso:focus-visible,
.color-mode-active .elemento-nao-metal:focus-visible,
.color-mode-active .elemento-semimetal:focus-visible {
  box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.4) !important;
  filter: brightness(1.1);
}

/* ============================= */
/*              Modal            */
/* ============================= */
.modal-content { background: #1a1a24; color: #fff; border: 1px solid var(--border); border-radius: 1rem; }
.modal-header, .modal-footer { border-color: var(--border); }
.modal-about-image { border-radius: 8px; box-shadow: 0 10px 20px rgba(0,0,0,0.2); transition: transform 0.3s ease; }
.modal-about-image:hover { transform: scale(1.02); }

/* ============================= */
/*     Seção da Tabela (UI)      */
/* ============================= */
section#secao-periodos { padding: 2rem 0; position: relative; }

/* container de elementos (mais legível) */
#tabela-container {
  position: relative;
  border: 1px solid rgba(255,255,255,.12);
  border-radius: 1rem;
  padding: 1.5rem;
  min-height: 280px;
}
#tabela-status { position: absolute; clip: rect(0 0 0 0); clip-path: inset(50%); height: 1px; width: 1px; overflow: hidden; white-space: nowrap; }

/* Busca de elementos */
#busca-elemento::placeholder { color: rgba(255,255,255,0.5); }
#busca-resultado .busca-item {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: .75rem;
  padding: .75rem 1rem;
  margin-bottom: .5rem;
  cursor: pointer;
  transition: border-color .18s ease, background .18s ease;
}
#busca-resultado .busca-item:hover,
#busca-resultado .busca-item:focus-visible {
  border-color: var(--focus);
  background: rgba(42, 123, 255, 0.15);
}
#busca-resultado .busca-vazio { color: var(--muted); font-style: italic; }

/* Classes utilitárias (substituem estilos inline para acessibilidade) */
.bg-surface { background-color: var(--surface); }
.bg-surface-2 { background-color: var(--surface-2); }
.text-muted-pt { color: var(--muted); }
.icon-decorative-lg { font-size: 15rem; color: rgba(255, 255, 255, 0.7); }
.icon-decorative-lg-ml { font-size: 15rem; color: rgba(255, 255, 255, 0.7); margin-left: 1rem; }
.author-photo { width: 150px; height: 150px; object-fit: cover; border: 4px solid var(--primary); }
.author-card { border-radius: 1rem; overflow: hidden; box-shadow: 0 6px 20px rgba(0,0,0,0.3); }
.symbol-cell { min-width: 3rem; text-align: center; }

/* Navegação rápida na modal "Como funciona" */
.list-group-item-action:hover, .list-group-item-action:focus {
  background-color: rgba(42, 123, 255, 0.3) !important;
  transition: background-color 0.2s;
  padding-left: 10px !important;
}

/* ============================= */
/*     Keyframes (migrados do JS)*/
/* ============================= */
@keyframes gradientBackground {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}
@keyframes float {
  0%, 100% { transform: translateY(0) rotate(0deg); }
  25% { transform: translateY(-20px) rotate(5deg) scale(1.05); }
  50% { transform: translateY(0) rotate(10deg) scale(1); }
  75% { transform: translateY(20px) rotate(5deg) scale(0.95); }
}
@keyframes spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ============================= */
/*  Classes para inline styles   */
/* ============================= */

/* Partículas decorativas */
.particle-1 { width: 15px; height: 15px; left: 10%; top: 20%; animation: float 12s ease-in-out infinite; }
.particle-2 { width: 25px; height: 25px; left: 20%; top: 80%; animation: float 16s ease-in-out infinite; }
.particle-3 { width: 20px; height: 20px; left: 50%; top: 30%; animation: float 13s ease-in-out infinite; }
.particle-4 { width: 10px; height: 10px; left: 80%; top: 20%; animation: float 14s ease-in-out infinite; }
.particle-5 { width: 30px; height: 30px; left: 90%; top: 70%; animation: float 15s ease-in-out infinite; }
.particle-6 { width: 15px; height: 15px; left: 30%; top: 60%; animation: float 11s ease-in-out infinite; }
.particle-7 { width: 20px; height: 20px; left: 70%; top: 50%; animation: float 12s ease-in-out infinite; }

/* Átomo decorativo */
.tp-atom { position: relative; width: 100px; height: 100px; margin: 0 auto 2rem; }
.tp-nucleus {
  position: absolute; top: 50%; left: 50%; transform: translate(-50%,-50%);
  width: 30px; height: 30px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #f7b733, #fc4a1a);
  box-shadow: 0 0 15px rgba(252, 74, 26, 0.7); z-index: 2;
}
.tp-orbit {
  position: absolute; border: 2px dashed rgba(255,255,255,0.4); border-radius: 50%;
}
.tp-orbit-1 { top: 0; left: 0; width: 100%; height: 100%; animation: spin 8s linear infinite; }
.tp-orbit-2 { top: 10%; left: 10%; width: 80%; height: 80%; animation: spin 6s linear infinite reverse; transform: rotate(60deg); }
.tp-orbit-3 { top: 20%; left: 20%; width: 60%; height: 60%; animation: spin 4s linear infinite; transform: rotate(30deg); }
.tp-electron {
  position: absolute; top: -6px; left: 50%; width: 12px; height: 12px; border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, #4facfe, #00f2fe);
  box-shadow: 0 0 10px rgba(79, 172, 254, 0.8);
}

/* Utilitários */
.tp-z1 { z-index: 1; }
.tp-btn-fit { min-width: fit-content; }
.tp-img-responsive { max-width: 100%; height: auto; }
.tp-img-80 { max-width: 80%; }
.tp-electron-label { position: relative; top: -0.5em; }

/* ============================= */
/* Polyfills Bootstrap 5.2+      */
/* ============================= */
.rounded-4 { border-radius: 0.5rem !important; }
.border-opacity-25 { --bs-border-opacity: .25; }
.bg-opacity-50 { --bs-bg-opacity: .5; }