:root {
    /* MODO OSCURO PERMANENTE */
    --bg-main: #0f172a;
    --bg-panel: #1e293b;
    --bg-sidebar: #0f172a;
    --bg-sidebar-hover: #1e293b;
    
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --text-sidebar: #f8fafc;
    
    --accent-primary: #38bdf8;
    --accent-hover: #7dd3fc;
    --accent-light: rgba(56, 189, 248, 0.1);
    
    --border-color: #334155;
    
    /* Sombras y Radios */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--bg-main);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    overflow-x: hidden;
}

/* Colores de Pestañas Internas */
.tab-auditoria {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.tab-auditoria.active {
    color: #8b5cf6 !important;
    border-bottom-color: #8b5cf6 !important;
    background: rgba(139, 92, 246, 0.08) !important;
}

.tab-mallas {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}
.tab-mallas.active {
    color: #10b981 !important;
    border-bottom-color: #10b981 !important;
    background: rgba(16, 185, 129, 0.08) !important;
}

/* Welcome Dashboard / Hero */
.welcome-dashboard {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    padding: 2rem;
    max-width: 1000px;
    margin: 0 auto;
    animation: fadeIn 0.5s ease;
}

.welcome-hero {
    background: linear-gradient(135deg, var(--bg-sidebar), var(--bg-sidebar-hover));
    color: white;
    padding: 3rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    text-align: center;
    position: relative;
    overflow: hidden;
}

.welcome-hero h1 {
    font-family: 'Outfit', sans-serif;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
}

.welcome-hero p {
    font-size: 1.1rem;
    opacity: 0.9;
    max-width: 600px;
    margin: 0 auto 2rem auto;
    line-height: 1.6;
}

.welcome-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.welcome-buttons button {
    padding: 0.8rem 1.5rem;
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    border: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.welcome-buttons .btn-primary {
    background: white;
    color: var(--bg-sidebar);
    box-shadow: var(--shadow-md);
}

.welcome-buttons .btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
    background: #f8fafc;
}

.welcome-buttons .btn-secondary {
    background: rgba(255, 255, 255, 0.2);
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.4);
}

.welcome-buttons .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.3);
}

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

.feature-card {
    background: var(--bg-panel);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    text-align: center;
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-md);
    border-color: var(--bg-sidebar);
}

.feature-icon {
    font-size: 2.5rem;
    color: var(--bg-sidebar);
    margin-bottom: 1rem;
}

.feature-card h3 {
    font-family: 'Outfit', sans-serif;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}

.feature-card p {
    color: var(--text-muted);
    font-size: 0.95rem;
    line-height: 1.5;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
}

/* Layout */
.app-container {
    display: flex;
    height: 100vh;
    width: 100vw;
}

/* Sidebar */
.sidebar {
    width: 280px;
    background-color: var(--bg-sidebar);
    color: var(--text-sidebar);
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-lg);
    z-index: 20;
    transition: var(--transition);
}

.sidebar-header {
    padding: 2rem 1.5rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-family: 'Outfit', sans-serif;
    font-size: 1.5rem;
    font-weight: 800;
    color: #ffffff;
    letter-spacing: -0.5px;
}

.logo i {
    color: var(--accent-primary);
    font-size: 1.8rem;
}

.subtitle {
    font-size: 0.85rem;
    color: var(--text-sidebar-muted);
    margin-top: 0.25rem;
    margin-left: 2.5rem;
}

.nav-menu {
    padding: 1.5rem 1rem;
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.nav-menu::-webkit-scrollbar {
    width: 5px;
}
.nav-menu::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.1);
    border-radius: 10px;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 0.875rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-sidebar);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    cursor: pointer;
    border: 1px solid transparent;
}

.nav-item:hover {
    background-color: var(--bg-sidebar-hover);
    transform: translateX(5px);
}

.nav-item.active {
    background-color: var(--accent-primary);
    color: #ffffff;
    box-shadow: 0 4px 12px rgba(79, 70, 229, 0.4);
    border-color: rgba(255, 255, 255, 0.1);
}

.nav-item i {
    font-size: 1.2rem;
    opacity: 0.8;
}

.nav-item.active i {
    opacity: 1;
}

.sidebar-footer {
    padding: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.version {
    font-size: 0.75rem;
    color: var(--text-sidebar-muted);
}

/* Main Content */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.top-header {
    background-color: var(--bg-panel);
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    z-index: 10;
}

.header-title h1 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.25rem;
}

.header-title p {
    color: var(--text-muted);
    font-size: 0.875rem;
}

.theme-toggle {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: var(--transition);
    font-size: 1.2rem;
}

.theme-toggle:hover {
    background: var(--accent-light);
    color: var(--accent-primary);
    transform: rotate(15deg);
}

/* Content Wrapper */
.content-wrapper {
    flex: 1;
    overflow-y: auto;
    padding: 2rem;
    position: relative;
    scroll-behavior: smooth;
}

/* Grades Tabs */
.grades-tabs-container {
    margin-bottom: 2rem;
    animation: fadeInDown 0.5s ease;
}

.tabs-scroll {
    overflow-x: auto;
    padding-bottom: 0.5rem;
}

.tabs-scroll::-webkit-scrollbar {
    height: 4px;
}
.tabs-scroll::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

.grades-tabs {
    display: flex;
    list-style: none;
    gap: 0.5rem;
    border-bottom: 2px solid var(--border-color);
    padding-bottom: 1px;
}

.grade-tab {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    white-space: nowrap;
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.grade-tab:hover {
    color: var(--accent-primary);
    background-color: var(--accent-light);
}

.grade-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

/* Dashboard Content Area */
.content-display {
    background-color: var(--bg-panel);
    border-radius: var(--radius-xl);
    padding: 2.5rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    animation: fadeIn 0.6s ease;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    text-align: center;
    min-height: 400px;
    background: transparent;
    border: 2px dashed var(--border-color);
    box-shadow: none;
}

.empty-icon {
    font-size: 4rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state h2 {
    color: var(--text-muted);
    margin-bottom: 0.5rem;
}

.empty-state p {
    color: var(--text-muted);
    max-width: 400px;
}

/* Internal Tabs */
.internal-tabs {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    border-bottom: 2px solid var(--border-color);
}

.internal-tab {
    padding: 0.75rem 1.5rem;
    font-weight: 600;
    color: var(--text-muted);
    cursor: pointer;
    border-bottom: 3px solid transparent;
    transition: var(--transition);
    background: transparent;
    border-top: none; border-left: none; border-right: none;
    font-size: 1rem;
}

.internal-tab:hover {
    color: var(--accent-primary);
}

.internal-tab.active {
    color: var(--accent-primary);
    border-bottom-color: var(--accent-primary);
}

.tab-pane {
    display: none;
    animation: fadeIn 0.4s ease;
}

.tab-pane.active {
    display: block;
}

/* Sections */
.section-card {
    margin-bottom: 2.5rem;
}

.section-title {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.4rem;
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    padding-bottom: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.section-title i {
    font-size: 1.5rem;
    background: var(--accent-light);
    padding: 0.5rem;
    border-radius: var(--radius-md);
}

/* Markdown Content Styling */
.markdown-content {
    color: var(--text-main);
    line-height: 1.8;
}

.markdown-content h1, 
.markdown-content h2, 
.markdown-content h3 {
    margin-top: 2rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.markdown-content h1 { font-size: 1.8rem; }
.markdown-content h2 { font-size: 1.5rem; }
.markdown-content h3 { font-size: 1.25rem; }

.markdown-content p {
    margin-bottom: 1.25rem;
}

.markdown-content ul, 
.markdown-content ol {
    margin-bottom: 1.5rem;
    padding-left: 1.5rem;
}

.markdown-content li {
    margin-bottom: 0.5rem;
}

.markdown-content strong {
    color: var(--text-main);
    font-weight: 700;
}

.markdown-content em {
    color: var(--accent-primary);
    font-style: normal;
    background: var(--accent-light);
    padding: 0 0.2rem;
    border-radius: 4px;
}

.markdown-content blockquote {
    border-left: 4px solid var(--accent-primary);
    background: var(--accent-light);
    padding: 1rem 1.5rem;
    margin-bottom: 1.5rem;
    border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.markdown-content hr {
    border: 0;
    height: 1px;
    background: var(--border-color);
    margin: 2rem 0;
}

/* Period Toggles */
.period-toggles {
    display: flex;
    gap: 1rem;
    margin-bottom: 2rem;
    background: var(--bg-panel);
    padding: 0.5rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
}

.period-toggle-btn {
    flex: 1;
    padding: 1rem;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 700;
    color: var(--text-muted);
    background: transparent;
    border: 2px solid transparent;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.period-toggle-btn:hover {
    color: var(--accent-primary);
    background: var(--bg-main);
}

.period-toggle-btn.active {
    background: var(--bg-main);
    color: var(--accent-primary);
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.period-pane {
    display: none;
    animation: fadeIn 0.4s ease;
}

.period-pane.active {
    display: block;
}

.period-header {
    background: #0f172a;
    color: #ffffff;
    padding: 1.25rem 2rem;
    border-radius: var(--radius-lg) var(--radius-lg) 0 0;
    margin-bottom: 0;
    font-size: 1.4rem;
    font-family: 'Outfit', sans-serif;
}

[data-theme="dark"] .period-header {
    background: #1e293b;
}

/* Topic Cards (Full Width) */
.topic-list-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    background: var(--bg-panel);
    padding: 1.5rem;
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    border: 1px solid var(--border-color);
    border-top: none;
}

.topic-list-card {
    background: var(--bg-main);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1.5rem 2rem;
    transition: var(--transition);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 2rem;
}

.topic-list-card:hover {
    border-color: var(--accent-primary);
    box-shadow: var(--shadow-sm);
}

.topic-list-card.revisado-active {
    background: var(--accent-light);
    border-color: rgba(99, 102, 241, 0.3);
    opacity: 0.85;
}

.topic-info {
    flex: 1;
}

.topic-info h4 {
    font-size: 1.25rem;
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
    margin-bottom: 0.5rem;
    font-weight: 700;
}

.topic-list-card.revisado-active .topic-info h4 {
    text-decoration: line-through;
    color: var(--text-muted);
}

.desc-large {
    font-size: 1.1rem;
    color: var(--text-muted);
    margin-bottom: 0.75rem;
    line-height: 1.6;
}

.align-blue {
    font-size: 0.95rem;
    color: var(--accent-primary);
    font-style: italic;
    font-weight: 500;
}

.topic-actions {
    flex-shrink: 0;
}

.revisado-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    background: var(--bg-panel);
    padding: 0.75rem 1.25rem;
    border-radius: 50px;
    border: 2px solid var(--border-color);
    font-weight: 600;
    color: var(--text-muted);
    transition: var(--transition);
    font-size: 1.1rem;
}

.revisado-btn:hover {
    border-color: var(--accent-primary);
    color: var(--accent-primary);
}

.revisado-btn input[type="checkbox"] {
    width: 1.2rem;
    height: 1.2rem;
    cursor: pointer;
    accent-color: var(--accent-primary);
}

.topic-list-card.revisado-active .revisado-btn {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: #ffffff;
}

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

@keyframes fadeInDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Responsive */
/* Mobile Topbar */
.mobile-topbar {
    display: none;
    background: var(--bg-panel);
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    justify-content: space-between;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 900;
}

.mobile-topbar .logo {
    font-size: 1.5rem;
    font-weight: 800;
    font-family: 'Outfit', sans-serif;
    color: var(--text-main);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.hamburger-btn {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 1.8rem;
    cursor: pointer;
}

/* Sidebar Overlay */
.sidebar-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    z-index: 950;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.sidebar-overlay.active {
    display: block;
    opacity: 1;
}

@media (max-width: 768px) {
    .mobile-topbar {
        display: flex;
    }
    
    .main-content {
        margin-top: 60px; /* Space for topbar */
        padding-top: 1rem;
        height: calc(100vh - 60px);
    }

    .sidebar {
        position: fixed;
        left: -100%;
        top: 0;
        bottom: 0;
        width: 280px;
        height: 100vh;
        z-index: 1000;
        transition: left 0.3s ease;
        flex-direction: column;
        background: var(--bg-sidebar);
    }
    
    .sidebar.mobile-open {
        left: 0;
    }
    
    .nav-menu {
        flex-direction: column;
        overflow-y: auto;
        padding: 1rem;
        margin: 0;
    }
    
    .nav-item {
        margin-bottom: 0.5rem;
    }
    
    .sidebar-header {
        border-bottom: 1px solid var(--border-color);
        padding: 1.5rem;
        display: flex;
        justify-content: space-between;
    }
    
    .subtitle, .sidebar-footer {
        display: block;
    }
    
    .internal-tabs {
        flex-direction: column;
        gap: 0.5rem;
    }
    
    .internal-tab {
        width: 100%;
        padding: 1rem;
        border: 1px solid var(--border-color);
        border-radius: var(--radius-md) !important;
        text-align: center;
    }
    
    .period-toggles {
        flex-direction: column;
    }
    
    .period-toggle-btn {
        width: 100%;
        padding: 1rem;
    }
    
    .grades-nav {
        overflow-x: auto;
        white-space: nowrap;
        padding-bottom: 0.5rem;
    }
    
    .topic-list-card {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
        padding: 1.5rem 1rem;
    }
    
    .topic-actions {
        width: 100%;
    }
    
    .revisado-btn {
        width: 100%;
        justify-content: center;
    }
    
    .welcome-hero h1 { font-size: 1.8rem; }
    .welcome-hero p { font-size: 1rem; }
}

@media (max-width: 768px) {
    /* Forense: Eliminar padding asfixiante de todas las cajas en celulares */
    .content-wrapper { padding: 1rem 0.5rem !important; }
    .content-display { padding: 1rem !important; border-radius: 12px !important; }
    
    .welcome-dashboard { padding: 0 !important; gap: 1rem !important; }
    .welcome-hero { 
        padding: 1.5rem 1rem !important; 
        border-radius: 12px !important;
        width: 100% !important;
        box-sizing: border-box !important;
    }
    
    .welcome-hero h1 { 
        font-size: 1.5rem !important; 
        line-height: 1.2 !important;
        word-wrap: break-word !important;
    }
    .welcome-hero p {
        font-size: 0.95rem !important;
        margin-bottom: 1.5rem !important;
    }
}