/* 
 * Arquivo: assets/css/main.css
 * Estilos principais do portal Prof. Sérgio Luiz
 * Framework: Bootstrap 5.3 + Customizações
 */

:root {
    --primary-dark: #1e3c72;
    --primary-light: #2a5298;
    --accent-color: #ff6b35;
    --text-dark: #2c3e50;
    --text-light: #6c757d;
    --bg-light: #f8f9fa;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
    --shadow-md: 0 4px 12px rgba(0,0,0,0.1);
    --shadow-lg: 0 8px 24px rgba(0,0,0,0.15);
    --transition: all 0.3s ease;
}

/* ===== Reset e Base ===== */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    color: var(--text-dark);
    line-height: 1.6;
    background-color: #fff;
}

/* ===== Utilitários ===== */
.transition { transition: var(--transition); }
.hover-shadow:hover { box-shadow: var(--shadow-lg) !important; }
.text-gradient {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

/* ===== Navbar ===== */
.navbar {
    padding: 0.75rem 0;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}

.navbar-brand {
    font-size: 1.25rem;
    letter-spacing: -0.5px;
}

.dropdown-menu {
    border: none;
    border-radius: 8px;
    box-shadow: var(--shadow-md);
    padding: 0.5rem 0;
    min-width: 280px;
}

.dropdown-header {
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: rgba(255,255,255,0.6) !important;
    padding: 0.5rem 1rem;
}

.dropdown-item {
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
    transition: var(--transition);
}

.dropdown-item:hover {
    background-color: rgba(255,255,255,0.1);
    padding-left: 1.25rem;
}

.dropdown-item i {
    width: 20px;
    text-align: center;
}

/* ===== Hero Section ===== */
.hero-section {
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    background: radial-gradient(circle at 30% 20%, rgba(255,255,255,0.1) 0%, transparent 50%);
    pointer-events: none;
}

/* ===== Cards de Disciplina ===== */
.card {
    border-radius: 12px;
    overflow: hidden;
}

.card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.card .bi {
    transition: var(--transition);
}

.card:hover .bi {
    transform: scale(1.1);
}

/* ===== Tabs de Conteúdo ===== */
.nav-tabs {
    border-bottom: 2px solid #e9ecef;
    margin-bottom: 1.5rem;
}

.nav-tabs .nav-link {
    border: none;
    color: var(--text-light);
    font-weight: 500;
    padding: 0.75rem 1.5rem;
    border-radius: 8px 8px 0 0;
    transition: var(--transition);
}

.nav-tabs .nav-link:hover {
    color: var(--primary-dark);
    background-color: rgba(30, 60, 114, 0.05);
}

.nav-tabs .nav-link.active {
    color: var(--primary-dark);
    background-color: transparent;
    border-bottom: 3px solid var(--primary-dark);
    font-weight: 600;
}

/* ===== List Group Personalizado ===== */
.list-group-item {
    border-left: 4px solid transparent;
    transition: var(--transition);
    padding: 1rem 1.25rem;
}

.list-group-item:hover {
    border-left-color: var(--primary-dark);
    background-color: rgba(30, 60, 114, 0.03);
}

.list-group-item .badge {
    font-weight: 500;
    padding: 0.5em 0.75em;
}

/* ===== Botões ===== */
.btn {
    border-radius: 8px;
    font-weight: 500;
    padding: 0.5rem 1.25rem;
    transition: var(--transition);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
    border: none;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(30, 60, 114, 0.3);
}

.btn-outline-primary {
    border-width: 2px;
}

/* ===== Formulários ===== */
.form-control, .form-select {
    border-radius: 8px;
    padding: 0.625rem 1rem;
    border: 2px solid #e9ecef;
    transition: var(--transition);
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-light);
    box-shadow: 0 0 0 0.25rem rgba(42, 82, 152, 0.15);
}

.form-label {
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

/* ===== Alertas ===== */
.alert {
    border-radius: 8px;
    border: none;
    box-shadow: var(--shadow-sm);
}

.alert-dismissible .btn-close {
    padding: 1.25rem;
}

/* ===== Footer ===== */
footer {
    background: linear-gradient(135deg, var(--text-dark), #1a252f);
    color: rgba(255,255,255,0.8);
    padding: 2rem 0 1rem;
    margin-top: 4rem;
}

footer a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    transition: var(--transition);
}

footer a:hover {
    color: #fff;
    text-decoration: underline;
}

/* ===== Responsividade ===== */
@media (max-width: 991px) {
    .navbar-collapse {
        background-color: rgba(0,0,0,0.95);
        padding: 1rem;
        border-radius: 0 0 12px 12px;
        margin-top: 0.5rem;
    }
    
    .dropdown-menu {
        position: static;
        float: none;
        width: auto;
        box-shadow: none;
        background: transparent;
        padding: 0;
    }
    
    .dropdown-menu-dark {
        background-color: rgba(255,255,255,0.1);
        border-radius: 8px;
        margin: 0.5rem 0;
    }
    
    .hero-section .row {
        text-align: center;
    }
    
    .hero-section .text-lg-start {
        text-align: center !important;
    }
    
    .hero-section .d-flex {
        justify-content: center !important;
    }
}

@media (max-width: 576px) {
    .container {
        padding-left: 1rem;
        padding-right: 1rem;
    }
    
    .card-body.p-4 {
        padding: 1.25rem !important;
    }
    
    .nav-tabs .nav-link {
        padding: 0.5rem 0.75rem;
        font-size: 0.85rem;
    }
}

/* ===== Acessibilidade ===== */
@media (prefers-reduced-motion: reduce) {
    * {
        transition: none !important;
        animation: none !important;
    }
}

/* Focus visible para navegação por teclado */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible {
    outline: 3px solid var(--accent-color);
    outline-offset: 2px;
}

/* ===== Utilitários de Animação ===== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeInUp 0.5s ease forwards;
}

.animate-fade-in:nth-child(2) { animation-delay: 0.1s; }
.animate-fade-in:nth-child(3) { animation-delay: 0.2s; }
.animate-fade-in:nth-child(4) { animation-delay: 0.3s; }