/* ===================================
VARIÁVEIS E CORES
=================================== */
:root {
    --cor-principal: #0D0000;
    --cor-secundaria: #1a0000;
    --cor-destaque: #2a0000;
    --branco: #FFFFFF;
    --cinza-claro: #F5F5F5;
    --cinza-medio: #6E6E6E;
    --sucesso: #4CAF50;
    --erro: #F44336;
    --marrom-claro: #8D6E63;
    --marrom-medio: #6D4C41;
    --marrom-escuro: #4E342E;
    --dourado: #B8860B;
    --dourado-claro: #D4A017;
    --verde-ancestral: #2E7D32;
    --sombra: rgba(13, 0, 0, 0.1);
    --sombra-forte: rgba(13, 0, 0, 0.2);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--cor-principal);
    background-color: var(--branco);
}

.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===================================
ÍCONES SVG DOURADOS
=================================== */
.logo-icon {
    width: 28px; height: 28px; color: var(--dourado); vertical-align: middle;
    margin-right: 0.5rem; display: inline-block;
    filter: drop-shadow(0 1px 2px rgba(184, 134, 11, 0.3));
}

.feature-icon {
    width: 56px; height: 56px; color: var(--dourado); margin: 0 auto 1.25rem; display: block;
    transition: transform 0.3s ease, filter 0.3s ease;
    filter: drop-shadow(0 2px 4px rgba(184, 134, 11, 0.25));
}

.feature-card:hover .feature-icon {
    transform: scale(1.1);
    filter: drop-shadow(0 4px 8px rgba(184, 134, 11, 0.4));
}

/* ===================================
NAVEGAÇÃO
=================================== */
.navbar {
    background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%);
    color: var(--branco); padding: 1rem 0; position: sticky; top: 0; z-index: 1000;
    box-shadow: 0 2px 10px var(--sombra);
}

.nav-container { display: flex; justify-content: space-between; align-items: center; }

.logo h1 { font-size: 1.5rem; color: var(--branco); letter-spacing: 0.5px; display: flex; align-items: center; }

.nav-links { display: flex; list-style: none; gap: 2rem; align-items: center; }

.nav-link { color: var(--branco); text-decoration: none; transition: color 0.3s; font-weight: 500; }

.nav-link:hover { color: rgba(255, 255, 255, 0.7); }

.mobile-menu-btn { display: none; background: none; border: none; color: var(--branco); font-size: 1.5rem; cursor: pointer; }

/* ===================================
INDICADOR DE CONEXÃO
=================================== */
.connection-status {
    display: flex; align-items: center; gap: 0.5rem;
    padding: 0.4rem 0.8rem; background: rgba(255, 255, 255, 0.1);
    border-radius: 20px; font-size: 0.85rem; transition: all 0.3s ease;
}

.status-dot {
    width: 8px; height: 8px; border-radius: 50%;
    background: var(--sucesso); animation: pulse 2s infinite;
}

.connection-status.offline .status-dot { background: var(--erro); animation: pulse-error 2s infinite; }

.connection-status.offline .status-text { color: var(--erro); }

.status-text { color: var(--branco); font-weight: 500; }

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.6; transform: scale(1.2); }
}

@keyframes pulse-error {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.3); }
}

/* ===================================
MENSAGEM DE ORIENTAÇÃO DO MANUAL
=================================== */
.manual-aviso {
    background: linear-gradient(135deg, rgba(184, 134, 11, 0.1) 0%, rgba(212, 160, 23, 0.1) 100%);
    border-left: 4px solid var(--dourado);
    padding: 1rem 1.5rem;
    margin: 1.5rem 0;
    border-radius: 5px;
    font-size: 0.95rem;
    color: var(--cor-principal);
}

.manual-aviso strong {
    color: var(--dourado);
}

/* ===================================
HERO
=================================== */
.hero {
    background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%);
    color: var(--branco); padding: 6rem 0; text-align: center;
}

.hero h2 { font-size: 2.5rem; margin-bottom: 1rem; letter-spacing: 3px; text-transform: uppercase; font-weight: 700; }

.hero-subtitle { font-size: 1.5rem; margin-bottom: 1rem; font-weight: 300; opacity: 0.95; }

.hero-text { font-size: 1.1rem; margin-bottom: 2rem; opacity: 0.9; max-width: 700px; margin-left: auto; margin-right: auto; }

/* ===================================
BOTÕES
=================================== */
.btn {
    display: inline-block; padding: 0.75rem 1.5rem; border: none; border-radius: 5px;
    cursor: pointer; font-size: 1rem; text-decoration: none; transition: all 0.3s; text-align: center;
}

.btn-primary { background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-medio) 100%); color: var(--branco); font-weight: bold; }

.btn-primary:hover { background: linear-gradient(135deg, var(--marrom-escuro) 0%, var(--cor-principal) 100%); transform: translateY(-2px); box-shadow: 0 4px 12px var(--sombra-forte); }

.btn-outline { background-color: transparent; border: 2px solid var(--cor-principal); color: var(--cor-principal); }

.btn-outline:hover { background-color: var(--cor-principal); color: var(--branco); }

.btn-large { padding: 1rem 2.5rem; font-size: 1.1rem; }

.btn-block { display: block; width: 100%; }

.btn-link { background: none; border: none; color: var(--marrom-medio); cursor: pointer; text-decoration: underline; font-weight: 600; }

/* ===================================
SEÇÕES
=================================== */
.section { padding: 4rem 0; }

.section-alt { background-color: var(--cinza-claro); }

.section-title { text-align: center; font-size: 2rem; color: var(--cor-principal); margin-bottom: 2rem; font-weight: 700; }

/* ===================================
FILTROS
=================================== */
.filters { display: flex; gap: 1rem; margin-bottom: 2rem; flex-wrap: wrap; }

.search-input, .filter-select { padding: 0.75rem; border: 2px solid var(--cinza-medio); border-radius: 5px; font-size: 1rem; flex: 1; min-width: 200px; background-color: var(--branco); color: var(--cor-principal); }

.search-input:focus, .filter-select:focus { outline: none; border-color: var(--marrom-medio); }

/* ===================================
GRID DE LIVROS
=================================== */
.books-grid { display: grid; gap: 1.25rem; justify-content: center; padding: 1rem 0; }

@media (min-width: 1200px) { .books-grid { grid-template-columns: repeat(5, 200px); } }

@media (min-width: 768px) and (max-width: 1199px) { .books-grid { grid-template-columns: repeat(3, 200px); } }

@media (max-width: 767px) { .books-grid { grid-template-columns: 200px; } }

.book-card {
    width: 200px; height: 240px; background: var(--branco); border-radius: 8px; overflow: hidden;
    box-shadow: 0 2px 8px var(--sombra); transition: transform 0.3s ease, box-shadow 0.3s ease;
    display: flex; flex-direction: column; border: 1px solid rgba(13, 0, 0, 0.08); position: relative;
}

.book-card:hover { transform: translateY(-4px); box-shadow: 0 8px 20px var(--sombra-forte); }

.book-cover-wrapper { position: relative; width: 200px; height: 160px; overflow: hidden; flex-shrink: 0; }

.book-cover { width: 100%; height: 100%; object-fit: cover; display: block; background-color: var(--cinza-claro); }

.book-cover-gradient {
    position: absolute; bottom: 0; left: 0; right: 0; height: 60px;
    background: linear-gradient(to top, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0)); pointer-events: none; z-index: 1;
}

.book-price-badge {
    position: absolute; top: 8px; right: 8px; background: var(--dourado); color: var(--cor-principal);
    padding: 3px 8px; border-radius: 3px; font-size: 0.7rem; font-weight: bold; z-index: 2;
    letter-spacing: 0.3px; box-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.offline-toggle-btn {
    position: absolute; top: 8px; left: 8px; width: 32px; height: 32px; border-radius: 50%;
    background: rgba(0, 0, 0, 0.6); border: 1px solid rgba(255, 255, 255, 0.2);
    color: var(--branco); display: flex; align-items: center; justify-content: center;
    cursor: pointer; z-index: 3; transition: all 0.3s ease; backdrop-filter: blur(2px); padding: 0;
}

.offline-toggle-btn:hover { background: rgba(0, 0, 0, 0.85); transform: scale(1.1); }

.offline-toggle-btn svg { width: 18px; height: 18px; }

.offline-toggle-btn.saved { background: var(--verde-ancestral); color: var(--branco); border-color: var(--verde-ancestral); }

.offline-toggle-btn.loading { cursor: wait; opacity: 0.8; }

.offline-toggle-btn .spinner { animation: spin 1s linear infinite; width: 18px; height: 18px; }

.book-action-btn {
    position: absolute; bottom: 8px; left: 10%; width: 80%; background: var(--dourado); color: var(--cor-principal);
    border: none; border-radius: 4px; padding: 6px 0; font-weight: bold; font-size: 0.75rem; cursor: pointer;
    z-index: 2; display: flex; align-items: center; justify-content: center; gap: 4px;
    transition: all 0.3s ease; opacity: 0.92; letter-spacing: 0.3px; text-transform: uppercase;
}

.book-action-btn:hover { opacity: 1; background: var(--dourado-claro); transform: scale(1.03); }

.book-action-btn svg { width: 12px; height: 12px; flex-shrink: 0; }

@media (max-width: 767px) { .book-action-btn { opacity: 1; } }

@media (min-width: 768px) { .book-card:hover .book-action-btn { opacity: 1; background: var(--dourado-claro); } }

.book-info {
    height: 80px; padding: 10px 12px; display: flex; flex-direction: column;
    justify-content: center; align-items: center; text-align: center;
    flex-shrink: 0; background: var(--branco);
}

.book-title {
    font-size: 0.95rem; font-weight: 700; color: var(--cor-principal);
    line-height: 1.3; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; width: 100%;
}

.book-summary, .book-price, .book-actions { display: none; }

@keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
}

/* ===================================
MODAIS
=================================== */
.modal {
    display: none; position: fixed; z-index: 2000; left: 0; top: 0; width: 100%; height: 100%;
    background-color: rgba(13, 0, 0, 0.75); overflow: auto;
}

.modal-content {
    background-color: var(--branco); margin: 5% auto; padding: 2rem; border-radius: 10px;
    width: 90%; max-width: 500px; position: relative; animation: modalSlideIn 0.3s;
}

.modal-full {
    margin: 0; width: 100%; height: 100vh; max-width: 100%; padding: 0;
    flex-direction: column; overflow: hidden; border-radius: 0;
}

.modal.modal-full { display: none; }

@keyframes modalSlideIn { from { transform: translateY(-50px); opacity: 0; } to { transform: translateY(0); opacity: 1; } }

.close { color: var(--cinza-medio); float: right; font-size: 2rem; font-weight: bold; cursor: pointer; position: absolute; right: 1rem; top: 1rem; transition: color 0.3s; }

.close:hover { color: var(--cor-principal); }

/* ===================================
VIEWER HEADER
=================================== */
.viewer-header {
    display: flex; align-items: center; justify-content: space-between; padding: 0.35rem 0.6rem;
    background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%);
    color: var(--branco); flex-shrink: 0; min-height: 40px; gap: 0.5rem;
}

.viewer-back-btn {
    background: rgba(255, 255, 255, 0.15); color: var(--branco); border: 1px solid rgba(255, 255, 255, 0.3);
    padding: 0.3rem 0.6rem; border-radius: 5px; cursor: pointer; font-size: 0.8rem; font-weight: 500;
    transition: all 0.3s; white-space: nowrap; display: inline-flex; align-items: center; gap: 0.25rem; line-height: 1.2;
}

.viewer-back-btn .btn-icon { font-size: 0.9rem; }

.viewer-back-btn .btn-text-extra { display: none; }

.viewer-back-btn:hover { background: rgba(255, 255, 255, 0.25); transform: translateX(-2px); }

.viewer-back-btn:hover .btn-text-extra { display: inline; }

.viewer-close-btn {
    background: rgba(244, 67, 54, 0.9); color: var(--branco); border: none; width: 30px; height: 30px;
    border-radius: 50%; cursor: pointer; font-size: 0.95rem; font-weight: bold; transition: all 0.3s;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}

.viewer-close-btn:hover { background: var(--erro); transform: scale(1.1); }

.viewer-container { flex: 1; width: 100%; overflow: hidden; background: var(--branco); }

/* ===================================
FORMULÁRIOS
=================================== */
.form-group { margin-bottom: 1.5rem; }

.form-group label { display: block; margin-bottom: 0.5rem; color: var(--cor-principal); font-weight: 600; }

.form-group small { display: block; margin-top: 0.25rem; font-size: 0.85rem; color: var(--cinza-medio); }

.form-input { width: 100%; padding: 0.75rem; border: 2px solid var(--cinza-medio); border-radius: 5px; font-size: 1rem; transition: border-color 0.3s; background-color: var(--branco); color: var(--cor-principal); }

.form-input:focus { outline: none; border-color: var(--marrom-medio); }

.checkbox-group { display: flex; align-items: flex-start; gap: 0.5rem; }

.checkbox-group input[type="checkbox"] { margin-top: 0.25rem; }

/* ===================================
PAINEL ADMINISTRATIVO
=================================== */
.admin-tabs { display: flex; gap: 1rem; margin-bottom: 2rem; border-bottom: 3px solid var(--cinza-medio); flex-wrap: wrap; }

.tab-btn { padding: 1rem 1.5rem; background: none; border: none; border-bottom: 3px solid transparent; cursor: pointer; font-size: 1rem; color: var(--cinza-medio); transition: all 0.3s; margin-bottom: -3px; }

.tab-btn.active { color: var(--marrom-medio); border-bottom-color: var(--marrom-medio); font-weight: bold; }

.admin-tab-content { display: none; }

.admin-tab-content.active { display: block; }

.admin-form { max-width: 700px; background: var(--cinza-claro); padding: 2rem; border-radius: 10px; }

.admin-list { background: var(--cinza-claro); padding: 2rem; border-radius: 10px; }

.admin-book-item {
    background: var(--branco); padding: 1rem; margin-bottom: 1rem; border-radius: 5px;
    display: flex; justify-content: space-between; align-items: center;
    border-left: 4px solid var(--marrom-medio); flex-wrap: wrap; gap: 1rem;
}

.admin-book-order { display: flex; align-items: center; min-width: 120px; }

.order-input {
    width: 70px; padding: 0.4rem 0.5rem; border: 2px solid var(--cinza-medio); border-radius: 4px;
    font-size: 0.95rem; font-weight: 600; text-align: center; color: var(--cor-principal);
    background-color: var(--branco); transition: border-color 0.3s;
}

.order-input:focus { outline: none; border-color: var(--dourado); background-color: #fffef5; }

.admin-book-info { flex: 1; min-width: 200px; }

.admin-book-info h4 { color: var(--cor-principal); margin-bottom: 0.25rem; }

.admin-book-meta { font-size: 0.9rem; color: var(--cinza-medio); }

.admin-actions { display: flex; gap: 0.5rem; }

/* ===================================
CATEGORIAS
=================================== */
.category-manager { max-width: 700px; }

.category-manager h3 { margin: 2rem 0 1rem; color: var(--cor-principal); font-size: 1.25rem; }

.category-manager h3:first-child { margin-top: 0; }

.category-list { display: flex; flex-direction: column; gap: 0.75rem; margin-top: 1rem; }

.category-list-item { background: var(--branco); padding: 1rem 1.25rem; border-radius: 5px; display: flex; justify-content: space-between; align-items: center; border-left: 4px solid var(--dourado); box-shadow: 0 2px 5px var(--sombra); flex-wrap: wrap; gap: 0.75rem; }

.category-name { font-weight: 600; color: var(--cor-principal); font-size: 1.05rem; }

/* ===================================
ESTATÍSTICAS
=================================== */
.stats-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 1.5rem; }

.stat-card { background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%); color: var(--branco); padding: 2rem; border-radius: 10px; text-align: center; }

.stat-card h3 { font-size: 1rem; margin-bottom: 1rem; opacity: 0.9; }

.stat-number { font-size: 2.5rem; font-weight: bold; }

/* ===================================
SOBRE
=================================== */
.about-content { max-width: 800px; margin: 0 auto; text-align: center; }

.about-content p { margin-bottom: 1.5rem; font-size: 1.1rem; line-height: 1.8; color: var(--cor-principal); }

.features-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 2rem; margin-top: 3rem; }

.feature-card {
    background: var(--branco); padding: 2.5rem 2rem; border-radius: 10px; text-align: center;
    box-shadow: 0 4px 15px var(--sombra); transition: transform 0.3s, box-shadow 0.3s; border-top: 4px solid var(--dourado);
}

.feature-card:hover { transform: translateY(-5px); box-shadow: 0 8px 25px rgba(184, 134, 11, 0.2); }

.feature-card h3 { color: var(--marrom-medio); margin-bottom: 1rem; font-size: 1.25rem; }

.feature-card p { color: var(--cinza-medio); font-size: 0.95rem; line-height: 1.6; }

/* ===================================
FOOTER
=================================== */
.footer { background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%); color: var(--branco); padding: 2rem 0; text-align: center; }

.footer a { color: var(--branco); text-decoration: none; margin: 0 0.5rem; transition: opacity 0.3s; }

.footer a:hover { opacity: 0.7; }

/* ===================================
NOTIFICAÇÃO
=================================== */
.notification { position: fixed; top: 80px; right: 20px; background: var(--cor-principal); color: var(--branco); padding: 1rem 1.5rem; border-radius: 5px; box-shadow: 0 4px 15px var(--sombra-forte); transform: translateX(400px); transition: transform 0.3s; z-index: 4000; max-width: 350px; }

.notification.show { transform: translateX(0); }

/* ===================================
UTILITÁRIOS
=================================== */
.hidden { display: none !important; }

.empty-message { text-align: center; color: var(--cinza-medio); padding: 2rem; font-style: italic; grid-column: 1 / -1; }

/* ===================================
RESPONSIVO
=================================== */
@media (max-width: 968px) { .features-grid { grid-template-columns: repeat(2, 1fr); } }

@media (max-width: 768px) {
    .mobile-menu-btn { display: block; }
    .nav-links { display: none; flex-direction: column; position: absolute; top: 100%; left: 0; right: 0; background: linear-gradient(135deg, var(--cor-principal) 0%, var(--marrom-escuro) 100%); padding: 1rem; gap: 1rem; }
    .nav-links.active { display: flex; }
    .connection-status { width: 100%; justify-content: center; margin-top: 0.5rem; }
    .hero h2 { font-size: 1.8rem; }
    .hero-subtitle { font-size: 1.2rem; }
    .filters { flex-direction: column; }
    .search-input, .filter-select { min-width: 100%; }
    .modal-content { width: 95%; margin: 10% auto; padding: 1.5rem; }
    .admin-book-item, .category-list-item { flex-direction: column; align-items: flex-start; }
    .admin-actions { width: 100%; justify-content: flex-end; }
    .tab-btn { padding: 0.75rem 1rem; font-size: 0.9rem; }
    .viewer-header { padding: 0.3rem 0.5rem; min-height: 38px; flex-wrap: nowrap; gap: 0.4rem; }
    .viewer-back-btn { padding: 0.25rem 0.5rem; font-size: 0.75rem; }
    .viewer-close-btn { width: 28px; height: 28px; font-size: 0.85rem; }
    .admin-book-order { width: 100%; justify-content: flex-start; }
    .manual-aviso { font-size: 0.9rem; padding: 0.75rem 1rem; }
}

@media (max-width: 640px) { .features-grid { grid-template-columns: 1fr; } }

@media (max-width: 480px) {
    .hero h2 { font-size: 1.5rem; }
    .section-title { font-size: 1.5rem; }
    .stats-grid { grid-template-columns: 1fr; }
    .feature-icon { width: 48px; height: 48px; }
    .viewer-back-btn:hover .btn-text-extra { display: none; }
}