/* =====================================================
   TEMA MODERNIZADO - CEP CAJU
   Cores: Verde (#2d4a2d, #3d5a3d) e Laranja (#f39c12, #e67e22)
   ===================================================== */

:root {
    --verde-escuro: #2d4a2d;
    --verde-medio: #3d5a3d;
    --verde-claro: #4d6a4d;
    --laranja-principal: #f39c12;
    --laranja-hover: #e67e22;
    --bege-claro: #f5f5dc;
    --branco: #ffffff;
    --cinza-claro: #f8f9fa;
    --cinza-medio: #e0e0e0;
    --texto-escuro: #333333;
    --texto-claro: rgba(245, 245, 220, 0.9);
    --sombra-suave: 0 2px 8px rgba(0, 0, 0, 0.1);
    --sombra-media: 0 4px 16px rgba(0, 0, 0, 0.15);
    --sombra-forte: 0 8px 24px rgba(0, 0, 0, 0.2);
    --transicao: all 0.3s ease;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--texto-escuro);
    background: linear-gradient(135deg, var(--verde-escuro) 0%, #1a2e1a 100%);
    min-height: 100vh;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* ===================================================== 
   CABEÇALHO
   ===================================================== */

header {
    background: var(--laranja-principal);
    box-shadow: var(--sombra-media);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    gap: 1rem;
}

.logo-title {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.logo {
    height: 60px;
    width: auto;
    padding: 0.5rem 0.75rem;
    background: var(--branco);
    border-radius: 0.5rem;
    box-shadow: var(--sombra-suave);
    transition: var(--transicao);
}

.logo:hover {
    transform: translateY(-2px);
    box-shadow: var(--sombra-media);
}

.logo-title h1 {
    color: var(--branco);
    font-size: 1.75rem;
    font-weight: 700;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 0.875rem;
    font-weight: 400;
    margin-top: 0.25rem;
}

.btn-admin {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    background: var(--branco);
    color: var(--laranja-principal);
    text-decoration: none;
    border-radius: 0.5rem;
    font-weight: 600;
    font-size: 0.9375rem;
    transition: var(--transicao);
    box-shadow: var(--sombra-suave);
}

.btn-admin:hover {
    background: var(--cinza-claro);
    transform: translateY(-2px);
    box-shadow: var(--sombra-media);
}

/* ===================================================== 
   CONTEÚDO PRINCIPAL
   ===================================================== */

main {
    padding: 3rem 0;
    min-height: calc(100vh - 200px);
}

.hero {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.95);
    border-radius: 1rem;
    box-shadow: var(--sombra-media);
}

.hero h2 {
    color: var(--verde-escuro);
    font-size: 2.25rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.hero p {
    color: var(--texto-escuro);
    font-size: 1.125rem;
    max-width: 700px;
    margin: 0 auto;
    opacity: 0.8;
}

/* ===================================================== 
   SELETOR DE CLASSES
   ===================================================== */

.class-selector-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: var(--sombra-media);
    margin-bottom: 2rem;
}

.class-selector-header {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--laranja-principal);
}

.class-selector-header svg {
    color: var(--laranja-principal);
    flex-shrink: 0;
}

.class-selector-header h2 {
    color: var(--verde-escuro);
    font-size: 1.75rem;
    font-weight: 700;
}

.classes-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 1.5rem;
}

.class-card {
    background: linear-gradient(135deg, var(--verde-escuro) 0%, var(--verde-medio) 100%);
    padding: 2rem 1.5rem;
    border-radius: 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transicao);
    box-shadow: var(--sombra-suave);
}

.class-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--sombra-forte);
}

.class-icon {
    margin-bottom: 1rem;
}

.class-icon svg {
    color: var(--laranja-principal);
}

.class-card h3 {
    color: var(--branco);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.class-card p {
    color: var(--texto-claro);
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===================================================== 
   DISCIPLINAS
   ===================================================== */

.subjects-section {
    background: rgba(255, 255, 255, 0.95);
    border-radius: 1rem;
    padding: 2.5rem;
    box-shadow: var(--sombra-media);
}

.section-header {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    margin-bottom: 2rem;
    padding-bottom: 1.5rem;
    border-bottom: 2px solid var(--laranja-principal);
}

.btn-back {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    background: var(--verde-escuro);
    color: var(--branco);
    border: none;
    border-radius: 0.5rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transicao);
}

.btn-back:hover {
    background: var(--verde-medio);
    transform: translateX(-3px);
}

.section-header h3 {
    color: var(--verde-escuro);
    font-size: 1.75rem;
    font-weight: 700;
}

.section-subtitle {
    color: var(--texto-escuro);
    font-size: 0.9375rem;
    opacity: 0.7;
    margin-top: 0.25rem;
}

.subjects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.subject-card {
    display: flex;
    gap: 1.25rem;
    background: var(--branco);
    padding: 1.5rem;
    border-radius: 1rem;
    text-decoration: none;
    border: 2px solid var(--cinza-medio);
    transition: var(--transicao);
    box-shadow: var(--sombra-suave);
}

.subject-card:hover {
    border-color: var(--laranja-principal);
    transform: translateY(-3px);
    box-shadow: var(--sombra-media);
}

.subject-icon {
    flex-shrink: 0;
}

.emoji-icon {
    font-size: 2.5rem;
    display: block;
}

.subject-info {
    flex: 1;
}

.subject-info h3 {
    color: var(--verde-escuro);
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.subject-info p {
    color: var(--texto-escuro);
    font-size: 0.9375rem;
    margin-bottom: 0.75rem;
    opacity: 0.7;
}

.subject-meta {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--laranja-principal);
    font-size: 0.875rem;
    font-weight: 600;
}

.subject-meta svg {
    flex-shrink: 0;
}

.file-count {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

/* ===================================================== 
   RODAPÉ
   ===================================================== */

footer {
    background: var(--verde-escuro);
    color: var(--texto-claro);
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.footer-info {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.footer-logo {
    height: 50px;
    width: auto;
    padding: 0.375rem 0.5rem;
    background: var(--branco);
    border-radius: 0.375rem;
}

.footer-info p {
    font-size: 0.9375rem;
}

.footer-links p {
    font-size: 0.875rem;
    opacity: 0.8;
}

/* ===================================================== 
   UTILITÁRIOS
   ===================================================== */

.loading {
    text-align: center;
    padding: 3rem;
    color: var(--verde-medio);
    font-size: 1.125rem;
}

.empty-message {
    text-align: center;
    padding: 3rem;
    color: var(--texto-escuro);
    opacity: 0.6;
    font-size: 1rem;
}

.error-message {
    text-align: center;
    padding: 2rem;
    background: #fee;
    color: #c33;
    border-radius: 0.5rem;
    font-weight: 600;
}

/* ===================================================== 
   RESPONSIVIDADE
   ===================================================== */

@media (max-width: 768px) {
    .header-content {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-title {
        flex-direction: column;
        text-align: center;
    }
    
    .logo-title h1 {
        font-size: 1.5rem;
    }
    
    .hero h2 {
        font-size: 1.75rem;
    }
    
    .classes-grid {
        grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
        gap: 1rem;
    }
    
    .subjects-grid {
        grid-template-columns: 1fr;
    }
    
    .section-header {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .footer-content {
        flex-direction: column;
        text-align: center;
    }
    
    .footer-info {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    main {
        padding: 2rem 0;
    }
    
    .hero {
        padding: 1.5rem;
    }
    
    .class-selector-section,
    .subjects-section {
        padding: 1.5rem;
    }
    
    .logo {
        height: 50px;
    }
}