/* Reset Básico e Variáveis de Tema */
:root {
    --bg-color: #f0f2f5;
    --text-color: #333;
    --panel-bg: #ffffff;
    --card-bg: #ffffff; /* Cor padrão da frente */
    --card-back-bg: #f9fafb; /* Cor padrão do verso */
    --card-text-color: var(--text-color); /* Cor padrão do texto do cartão */
    --border-color: #ccc;
    --primary-color: #007BFF;
    --primary-hover-color: #0056b3;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --card-shadow-color: rgba(0, 0, 0, 0.2);
    --input-border-color: #aaa;
    --button-text-color: white;
    --header-bg: #e9ecef;
    --sidebar-width: 320px;
    --transition-speed: 0.3s;
    --navigator-bg: rgba(255, 255, 255, 0.95);
    --navigator-border: #bbb;
    --navigator-shadow: rgba(0, 0, 0, 0.2);
    --item-viewed-bg: #c8e6c9;
    --item-viewed-text: #1b5e20;
    --item-unviewed-bg: #ffcdd2;
    --item-unviewed-text: #b71c1c;
    --item-current-border: #007BFF;
    /* Variáveis para Cores Customizadas (serão definidas via JS) */
    --custom-card-bg: unset;
    --custom-card-text: unset;
}

/* Preload Tema Escuro */
html.dark-mode-preload body { --bg-color: #1a1a1a; --text-color: #e0e0e0; --panel-bg: #2c2c2c; --card-bg: #3a3a3a; --card-back-bg: #444444; --card-text-color: var(--text-color); --border-color: #555; --primary-color: #0066cc; --primary-hover-color: #004c99; --shadow-color: rgba(255, 255, 255, 0.08); --card-shadow-color: rgba(0, 0, 0, 0.5); --input-border-color: #777; --button-text-color: #e0e0e0; --header-bg: #252525; --navigator-bg: rgba(44, 44, 44, 0.95); --navigator-border: #666; --navigator-shadow: rgba(0, 0, 0, 0.4); --item-viewed-bg: #1b5e20; --item-viewed-text: #c8e6c9; --item-unviewed-bg: #b71c1c; --item-unviewed-text: #ffcdd2; --item-current-border: #4dabf5; background-color: var(--bg-color); color: var(--text-color); }

/* Tema Escuro (Body) */
body.dark-mode { --bg-color: #1a1a1a; --text-color: #e0e0e0; --panel-bg: #2c2c2c; --card-bg: #3a3a3a; --card-back-bg: #444444; --card-text-color: var(--text-color); --border-color: #555; --primary-color: #0066cc; --primary-hover-color: #004c99; --shadow-color: rgba(255, 255, 255, 0.08); --card-shadow-color: rgba(0, 0, 0, 0.5); --input-border-color: #777; --button-text-color: #e0e0e0; --header-bg: #252525; --navigator-bg: rgba(44, 44, 44, 0.95); --navigator-border: #666; --navigator-shadow: rgba(0, 0, 0, 0.4); --item-viewed-bg: #1b5e20; --item-viewed-text: #c8e6c9; --item-unviewed-bg: #b71c1c; --item-unviewed-text: #ffcdd2; --item-current-border: #4dabf5; }

/* Reset e Body */
* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: 'Segoe UI', sans-serif; background-color: var(--bg-color); color: var(--text-color); display: flex; min-height: 100vh; transition: background-color var(--transition-speed), color var(--transition-speed); overflow: hidden; }
.container { display: flex; flex-direction: column; width: 100%; height: 100vh; }

/* Cabeçalho */
.app-header { background-color: var(--header-bg); padding: 10px 20px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 10px; flex-shrink: 0; }
.app-header h1 { font-size: 1.5rem; margin-right: auto; color: var(--text-color); white-space: nowrap; margin-left: 10px; }
.header-controls { display: flex; align-items: center; gap: 8px; }
#theme-toggle-btn, #sidebar-toggle-btn, #card-color-btn { background: none; border: 1px solid transparent; color: var(--text-color); font-size: 1.4rem; cursor: pointer; padding: 5px; line-height: 1; transition: color var(--transition-speed), transform var(--transition-speed); }
#theme-toggle-btn:hover, #sidebar-toggle-btn:hover, #card-color-btn:hover { color: var(--primary-color); transform: scale(1.1); }
.search-container input[type="text"] { padding: 8px 12px; border-radius: 5px; border: 1px solid var(--input-border-color); background-color: var(--panel-bg); color: var(--text-color); min-width: 120px; transition: border-color var(--transition-speed); }
.search-container input[type="text"]:focus { outline: none; border-color: var(--primary-color); }
.import-export-container { display: flex; gap: 8px; }

/* Área Principal */
.main-area { display: flex; flex-grow: 1; overflow: hidden; transition: grid-template-columns var(--transition-speed); }

/* Área de Exibição do Cartão */
.card-display-area { flex-grow: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 30px; position: relative; background-color: var(--bg-color); overflow: visible; transition: padding var(--transition-speed); }

/* Wrapper Contador e Menu Navegador */
#card-counter-wrapper { position: absolute; top: 10px; left: 50%; transform: translateX(-50%); z-index: 20; text-align: center; }
#card-counter { font-size: 0.9rem; color: var(--text-color); background: var(--panel-bg); padding: 5px 12px; border-radius: 15px; border: 1px solid var(--border-color); cursor: pointer; box-shadow: var(--shadow-color) 0px 2px 4px; transition: background-color var(--transition-speed), box-shadow var(--transition-speed); min-width: 100px; }
#card-counter:hover { box-shadow: var(--shadow-color) 0px 4px 8px; }
.card-navigator { display: none; position: absolute; top: calc(100% + 5px); left: 50%; transform: translateX(-50%); width: clamp(250px, 60vw, 400px); max-height: 40vh; overflow-y: auto; background-color: var(--navigator-bg); border: 1px solid var(--navigator-border); border-radius: 8px; padding: 15px; box-shadow: 0 5px 15px var(--navigator-shadow); z-index: 25; }
.card-navigator.visible { display: block; }
.navigator-items { display: grid; grid-template-columns: repeat(auto-fill, minmax(35px, 1fr)); gap: 10px; }
.navigator-item { display: flex; align-items: center; justify-content: center; padding: 8px 4px; border-radius: 4px; font-size: 0.85rem; font-weight: bold; cursor: pointer; border: 2px solid transparent; transition: background-color 0.2s, border-color 0.2s, transform 0.1s; min-height: 30px; text-align: center; line-height: 1.2; }
.navigator-item:active { transform: scale(0.95); }
.navigator-item.viewed { background-color: var(--item-viewed-bg); color: var(--item-viewed-text); }
.navigator-item.unviewed { background-color: var(--item-unviewed-bg); color: var(--item-unviewed-text); }
.navigator-item.current { border-color: var(--item-current-border); box-shadow: 0 0 5px var(--item-current-border); }

/* Pilha de Cartões e Cartão */
.card-stack { position: relative; width: 90%; max-width: 750px; min-width: 300px; aspect-ratio: 16 / 10; perspective: 1800px; margin-bottom: 25px; margin-top: 60px; }
.card { width: 100%; height: 100%; position: absolute; transform-style: preserve-3d; transition: transform 0.7s cubic-bezier(0.4, 0, 0.2, 1); cursor: pointer; box-shadow: 0 15px 35px var(--card-shadow-color); border-radius: 18px; }
.card.flipped { transform: rotateY(180deg); }
/* ATUALIZAÇÃO DAS FACES DO CARTÃO */
.card-front, .card-back { position: absolute; top: 0; left: 0; width: 100%; height: 100%; padding: 30px 40px; backface-visibility: hidden; -webkit-backface-visibility: hidden; border-radius: 18px; /* Aplica cor customizada OU cor padrão do tema */ background-color: var(--custom-card-bg, var(--card-bg)); color: var(--custom-card-text, var(--card-text-color)); display: flex; align-items: center; justify-content: center; text-align: center; font-size: 2.0rem; line-height: 1.45; overflow-y: auto; box-shadow: inset 0 0 10px rgba(0,0,0,0.05); /* Adiciona transição para suavizar mudança de cor */ transition: background-color var(--transition-speed), color var(--transition-speed); }
body.dark-mode .card-front, body.dark-mode .card-back { box-shadow: inset 0 0 10px rgba(255,255,255,0.03); }
.card-back { background-color: var(--custom-card-bg, var(--card-back-bg)); transform: rotateY(180deg); }
/* ========================================= */

/* Controles de Navegação */
.navigation-controls { display: flex; gap: 20px; margin-top: 10px; flex-shrink: 0; }
.navigation-controls button { padding: 12px 20px; font-size: 1.1rem; }
.navigation-controls i { margin-right: 8px; }

/* Painel Lateral de Controles */
.controls-panel { width: var(--sidebar-width); flex-shrink: 0; padding: 20px; background-color: var(--panel-bg); border-left: 1px solid var(--border-color); display: flex; flex-direction: column; gap: 15px; overflow-y: auto; transition: width var(--transition-speed), opacity var(--transition-speed), padding var(--transition-speed); }
.controls-panel h2 { margin-top: 10px; margin-bottom: 5px; font-size: 1.2rem; border-bottom: 1px solid var(--border-color); padding-bottom: 5px; }
.controls-panel h2:first-child { margin-top: 0; }
.controls-panel label { font-weight: bold; margin-bottom: -10px; font-size: 0.9rem; display: block; }
.controls-panel input[type="text"], .controls-panel textarea, .controls-panel select { width: 100%; padding: 10px 12px; font-size: 1rem; border-radius: 5px; border: 1px solid var(--input-border-color); background-color: var(--bg-color); color: var(--text-color); transition: border-color var(--transition-speed), background-color var(--transition-speed); margin-top: 12px; }
.controls-panel select { margin-bottom: 10px; }
.controls-panel input[type="text"]:focus, .controls-panel textarea:focus, .controls-panel select:focus { outline: none; border-color: var(--primary-color); }
.controls-panel textarea { resize: vertical; min-height: 80px; }
.controls-panel hr { border: none; border-top: 1px solid var(--border-color); margin: 15px 0; }

/* Botões Gerais */
button { padding: 10px 15px; background-color: var(--primary-color); color: var(--button-text-color); font-weight: bold; border: none; border-radius: 6px; cursor: pointer; transition: background-color var(--transition-speed), transform 0.1s; font-size: 0.95rem; display: inline-flex; align-items: center; justify-content: center; gap: 5px; text-align: center; }
button:hover { background-color: var(--primary-hover-color); }
button:active { transform: scale(0.98); }
button:disabled { background-color: #ccc; cursor: not-allowed; opacity: 0.7; color: #666; }
body.dark-mode button:disabled { background-color: #555; color: #999; }

/* Grupo de Botões no Painel */
.button-group { display: flex; flex-wrap: wrap; gap: 8px; }
.button-group button { flex-grow: 1; min-width: 100px; }

/* Sidebar Oculta */
.main-area.sidebar-hidden .controls-panel { width: 0; padding: 0; opacity: 0; overflow: hidden; border-left: none; }
.main-area.sidebar-hidden .card-display-area { padding: 40px 60px; }

/* ESTILOS DO MODAL DE COR */
.color-modal { display: none; position: fixed; left: 0; top: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.5); z-index: 100; justify-content: center; align-items: center; }
.color-modal.visible { display: flex; }
.modal-content { background-color: var(--panel-bg); color: var(--text-color); padding: 25px 30px; border-radius: 8px; box-shadow: 0 5px 20px rgba(0,0,0,0.3); width: auto; max-width: 350px; text-align: center; }
.modal-content h3 { margin-top: 0; margin-bottom: 20px; }
.color-picker-group { margin-bottom: 15px; display: flex; align-items: center; justify-content: space-between; gap: 15px; }
.color-picker-group label { font-weight: bold; }
input[type="color"] { -webkit-appearance: none; appearance: none; width: 50px; height: 30px; border: 1px solid var(--border-color); cursor: pointer; padding: 0; border-radius: 4px; background-color: transparent; }
input[type="color"]::-webkit-color-swatch-wrapper { padding: 0; border-radius: 4px; }
input[type="color"]::-webkit-color-swatch { border: none; border-radius: 4px; }
input[type="color"]::-moz-color-swatch { border: none; border-radius: 4px; }
.modal-actions { margin-top: 25px; display: flex; justify-content: space-around; gap: 10px; }
.modal-actions button { padding: 8px 15px; }
#reset-color-btn { background-color: #6c757d; }
#reset-color-btn:hover { background-color: #5a6268; }
body.dark-mode #reset-color-btn { background-color: #5a6268; }
body.dark-mode #reset-color-btn:hover { background-color: #495057; }

/* Responsividade */
@media (max-width: 900px) { .main-area { flex-direction: column; } .controls-panel { width: 100%; max-height: 45vh; border-left: none; border-top: 1px solid var(--border-color); flex-shrink: 0; } .card-display-area { flex-grow: 1; padding: 20px; min-height: 50vh; } .card-stack { width: 95%; max-width: 600px; min-height: auto; margin-top: 50px; } .card-front, .card-back { font-size: 1.6rem; padding: 25px; } .main-area.sidebar-hidden .controls-panel { display: none; } .main-area.sidebar-hidden .card-display-area { padding: 30px; height: 100%; } }
@media (max-width: 600px) { .app-header { flex-direction: column; align-items: stretch; gap: 8px;} .header-controls{gap: 5px;} .search-container { width: 100%; } #search { width: 100%; min-width: auto; } .card-front, .card-back { font-size: 1.3rem; padding: 20px; } .navigation-controls button { padding: 10px 15px; font-size: 1rem; } .button-group { flex-direction: column; } .button-group button { width: 100%; } .main-area.sidebar-hidden .card-display-area { padding: 20px; } #card-counter-wrapper { top: 5px; } #card-counter { padding: 4px 10px; } .card-navigator { max-width: 95vw; width: clamp(200px, 80vw, 350px); } .navigator-items { grid-template-columns: repeat(auto-fill, minmax(30px, 1fr)); gap: 5px; } .navigator-item { font-size: 0.75rem; padding: 5px 3px; min-height: 25px; } }

/* Placeholders */
.placeholder-text { color: var(--text-color); opacity: 0.6; font-style: italic; padding: 20px; }