/* --- RESET, VARIABLES Y ESTILOS BASE --- */
*, *::before, *::after {
    box-sizing: border-box;
}

:root {
    /* Tema Claro - Colores Análogos Suaves */
    --bg-gradient: linear-gradient(-45deg, #e0e7ff, #dbeafe, #bae6fd, #ddd6fe);
    --title-blue: #0f172a;
    --title-green: #11803d;
    --slogan-color: #64748b;
    --nav-bg: rgba(255, 255, 255, 0.9);
    --nav-text: #11803d;
    --card-bg: #ffffff; 
    --card-border: #e2e8f0;
    --text-main: #1e293b;
    --input-bg: #f8fafc; 
    --input-border: #cbd5e1;
    --sidebar-text: #1e293b;
    --primary-btn: #2563eb;
    --primary-btn-hover: #1d4ed8;
    --dropzone-bg: #f8fafc;
    --dropzone-border: #cbd5e1;
    --table-header-bg: #f1f5f9;
    --table-row-hover: #e2e8f0;
    --table-row-even: #f8fafc;
    --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 25px -5px rgba(0, 0, 0, 0.1), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] {
    /* Tema Oscuro - Colores Análogos Profundos */
    --bg-gradient: linear-gradient(-45deg, #0f172a, #1e293b, #172554, #1e1b4b);
    --title-blue: #f8fafc;
    --title-green: #4ade80;
    --slogan-color: #94a3b8;
    --nav-bg: rgba(30, 41, 59, 0.9);
    --nav-text: #4ade80;
    --card-bg: rgba(15, 23, 42, 0.95); 
    --card-border: #334155;
    --text-main: #f1f5f9;
    --input-bg: #020617;
    --input-border: #475569;
    --sidebar-text: #f1f5f9;
    --primary-btn: #3b82f6;
    --primary-btn-hover: #2563eb;
    --dropzone-bg: #020617;
    --dropzone-border: #475569;
    --table-header-bg: #020617;
    --table-row-hover: #334155;
    --table-row-even: #0f172a;
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.18);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    min-height: 100vh;
    color: var(--text-main);
    overflow-x: hidden;

    /* Configuración Fondo Animado */
    background: var(--bg-gradient);
    background-size: 400% 400%;
    background-attachment: fixed;
    animation: gradientAnimation 10s ease infinite;
}

/* Animación de fondo circular */
@keyframes gradientAnimation {
    0% { background-position: 0% 0%; }
    25% { background-position: 100% 50%; }
    50% { background-position: 100% 100%; }
    75% { background-position: 0% 50%; }
    100% { background-position: 0% 0%; }
}

.card-shadow { box-shadow: var(--shadow-lg); }
.btn-shadow { box-shadow: var(--shadow-md); }

/* --- ENCABEZADO INSTITUCIONAL --- */
.main-top-header { width: 100%; padding: 40px 20px 15px; display: flex; justify-content: center; }
.header-content { display: flex; align-items: center; justify-content: center; gap: 30px; max-width: 1100px; width: 100%; }
.main-logo { width: 110px; height: auto; object-fit: contain; filter: drop-shadow(0 8px 12px rgba(0,0,0,0.15)); transition: transform 0.3s ease; }
.main-logo:hover { transform: scale(1.05); }
.header-text { display: flex; flex-direction: column; align-items: center; text-align: center; }
.inst-title { margin: 0; font-size: 2.4rem; font-weight: 900; color: var(--title-blue); letter-spacing: 2px; }
.inst-subtitle { margin: -3px 0 8px 0; font-size: 2.4rem; font-weight: 900; color: var(--title-blue); letter-spacing: 2px; }
.inst-slogan { margin: 0; font-size: 1.05rem; font-weight: 600; font-style: italic; color: var(--slogan-color); letter-spacing: 1.2px; }

/* --- NAVEGACIÓN --- */
.main-nav { 
    width: 90%; max-width: 1100px; background: var(--nav-bg); border-radius: 16px; 
    padding: 14px 28px; display: flex; justify-content: space-between; align-items: center; 
    box-shadow: var(--shadow-md); margin-bottom: 50px; border: 1px solid var(--card-border); 
    backdrop-filter: blur(10px); 
}
.nav-title { margin: 0; color: var(--nav-text); font-size: 1.5rem; font-weight: 800; letter-spacing: 0.5px; }
.nav-actions { display: flex; align-items: center; gap: 18px; }
.theme-btn { background: transparent; border: 1px solid var(--input-border); color: var(--text-main); width: 44px; height: 44px; border-radius: 10px; cursor: pointer; font-size: 1.25rem; display: flex; align-items: center; justify-content: center; transition: 0.3s ease; }
.theme-btn:hover { background: var(--input-border); transform: rotate(15deg); }
.nav-btn { padding: 12px 20px; border: none; border-radius: 10px; color: white; font-weight: 700; font-size: 1rem; cursor: pointer; display: flex; align-items: center; gap: 10px; transition: 0.3s ease; opacity: 0.7; }
.active-nav-btn { opacity: 1; box-shadow: var(--shadow-lg); transform: translateY(-2px); }
.btn-red { background-color: #ef4444; } .btn-red:hover { background-color: #dc2626; }
.btn-green { background-color: #10b981; } .btn-green:hover { background-color: #059669; }

/* --- CONTENEDORES --- */
.view-container { width: 100%; display: flex; justify-content: center; animation: fadeIn 0.5s ease-in-out; padding-bottom: 60px; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(15px); } to { opacity: 1; transform: translateY(0); } }

/* --- ASISTENCIA --- */
.layout-asistencia { display: grid; grid-template-columns: 450px 1fr; gap: 50px; width: 95%; max-width: 1200px; align-items: start; }
.table-card { background: var(--card-bg); border-radius: 24px; padding: 35px; border: 1px solid var(--card-border); height: 100%; min-height: 450px; display: flex; flex-direction: column; }
.table-header-panel { display: flex; flex-direction: column; align-items: center; gap: 20px; margin-bottom: 30px; width: 100%; }
.table-title { display: flex; align-items: center; justify-content: center; font-size: 1.6rem; font-weight: 800; color: var(--title-blue); margin: 0; }
.admin-actions { display: flex; align-items: center; justify-content: center; gap: 12px; width: 100%; animation: fadeIn 0.3s ease; }
.btn-admin { padding: 10px 16px; border: none; border-radius: 8px; color: white; font-weight: 700; cursor: pointer; display: inline-flex; align-items: center; gap: 8px; transition: 0.3s ease; font-size: 0.9rem; box-shadow: var(--shadow-sm); }
.btn-admin:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-excel { background-color: #107c41; } .btn-delete-all { background-color: #64748b; } .btn-lock { background-color: #f59e0b; }

.table-responsive { width: 100%; overflow-x: auto; max-height: 500px; overflow-y: auto; border-radius: 12px; border: 1px solid var(--card-border); background-color: var(--input-bg); }
.fancy-table { width: 100%; border-collapse: separate; border-spacing: 0; }
.fancy-table th, .fancy-table td { padding: 16px 20px; text-align: left; font-size: 0.95rem; color: var(--text-main); }
.col-accion { display: none; text-align: center; } .admin-active .col-accion { display: table-cell; }
.fancy-table th { font-weight: 800; color: var(--title-blue); background-color: var(--table-header-bg); position: sticky; top: 0; z-index: 10; border-bottom: 2px solid var(--input-border); text-transform: uppercase; font-size: 0.85rem; letter-spacing: 1px; }
.fancy-table tbody tr { transition: background-color 0.2s ease; border-bottom: 1px solid var(--input-border); }
.fancy-table tbody tr:last-child { border-bottom: none; }
.fancy-table tbody tr:nth-child(even) { background-color: var(--table-row-even); }
.fancy-table tbody tr:hover { background-color: var(--table-row-hover); }
.btn-delete { background-color: transparent; color: #ef4444; border: none; cursor: pointer; font-size: 1.15rem; transition: 0.3s ease; padding: 6px; border-radius: 8px; display: inline-flex; align-items: center; justify-content: center; }
.btn-delete:hover { background-color: rgba(239, 68, 68, 0.1); transform: scale(1.1); }

/* --- FORMULARIOS --- */
.main-card { background: var(--card-bg); border-radius: 24px; overflow: hidden; border: 1px solid var(--card-border); }
.form-body { padding: 35px; }
.input-group { margin-bottom: 22px; }
.input-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--title-blue); font-size: 0.9rem; }
input[type="text"], input[type="date"], select { width: 100%; padding: 14px; background: var(--input-bg); color: var(--text-main); border: 2px solid var(--input-border); border-radius: 12px; font-size: 15px; outline: none; transition: 0.3s; }
input:focus, select:focus { border-color: var(--primary-btn); box-shadow: 0 0 0 4px rgba(37, 99, 235, 0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

.upload-area { border: 2px dashed var(--dropzone-border); border-radius: 14px; padding: 30px; text-align: center; cursor: pointer; background: var(--dropzone-bg); transition: 0.3s; color: var(--text-main); }
.upload-area:hover, .upload-area.dragover { border-color: var(--primary-btn); background-color: rgba(37, 99, 235, 0.03); transform: scale(1.02); }
.upload-area.has-file { border-color: #10b981; background: rgba(16, 185, 129, 0.05); border-style: solid; }
.upload-icon { font-size: 32px; color: var(--primary-btn); margin-bottom: 10px; }
.upload-area.has-file .upload-icon { color: #10b981; }
.upload-area p { margin: 0; font-weight: 600; font-size: 0.95rem; word-break: break-all; }
.upload-area span { font-size: 0.8rem; opacity: 0.7; }
.submit-btn { width: 100%; background: var(--primary-btn); color: white; border: none; padding: 16px; border-radius: 12px; font-weight: 700; cursor: pointer; display: flex; align-items: center; justify-content: center; gap: 12px; margin-top: 20px; transition: 0.3s ease; font-size: 1.05rem; }
.submit-btn:disabled { background: #94a3b8; cursor: not-allowed; }
.submit-btn:hover:not(:disabled) { background: var(--primary-btn-hover); transform: translateY(-2px); }

/* Contenedor principal de mensajes (El margen ayuda a separarlo del formulario y el botón) */
.status-container { margin-top: 15px; font-size: 0.95rem; font-weight: 600; min-height: 25px; transition: all 0.3s ease; }

/* --- TAREAS --- */
.layout-wrapper {
    display: grid;
    /* Herramientas ensanchadas a 480px y el Formulario en 500px */
    grid-template-columns: 480px 500px; 
    justify-content: center; 
    gap: 60px; 
    width: 95%;
    max-width: 1200px;
    align-items: start;
}

.info-sidebar { 
    color: var(--sidebar-text); 
    width: 100%; 
    padding: 0; 
}

.sidebar-main-title { 
    font-size: 2.2rem; 
    margin: 0 0 30px 0; 
    font-weight: 800; 
    text-align: center; 
    color: var(--title-blue); 
}

.sidebar-block { 
    background: var(--card-bg); 
    padding: 25px; 
    border-radius: 18px; 
    border: 1px solid var(--card-border); 
    margin-bottom: 25px;
}

.heading-insignia { width: 24px; height: auto; vertical-align: middle; margin-right: 10px; position: relative; top: -2px; }
.sidebar-block h3 { display: flex; align-items: center; margin: 0 0 18px 0; font-size: 1.15rem; color: var(--title-blue); }
.tool-info { margin-bottom: 18px; border-left: 3px solid var(--primary-btn); padding-left: 15px; }
.tool-name { display: block; font-size: 1.3rem; font-weight: 800; color: var(--primary-btn); margin-bottom: 6px; }
.tool-desc { margin: 0; font-size: 0.95rem; line-height: 1.6; opacity: 0.9; }

.tool-btn { 
    display: inline-flex; align-items: center; gap: 8px; 
    padding: 10px 20px; background-color: var(--primary-btn); color: white; 
    text-decoration: none; border-radius: 10px; font-size: 0.9rem; 
    font-weight: 700; transition: 0.3s ease; box-shadow: var(--shadow-sm); 
}
.tool-btn:hover { background-color: var(--primary-btn-hover); transform: translateY(-2px); box-shadow: var(--shadow-md); color: white; }

/* --- MODALES --- */
.modal-overlay { position: fixed; top: 0; left: 0; width: 100%; height: 100%; background-color: rgba(0, 0, 0, 0.6); display: flex; align-items: center; justify-content: center; z-index: 2000; opacity: 0; visibility: hidden; transition: 0.3s ease; backdrop-filter: blur(4px); }
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-window { background-color: var(--card-bg); color: var(--text-main); width: 90%; max-width: 450px; border-radius: 20px; box-shadow: var(--shadow-lg); border: 1px solid var(--card-border); transform: translateY(20px); transition: 0.3s ease; overflow: hidden; }
.modal-overlay.open .modal-window { transform: translateY(0); }
.modal-header { padding: 20px 25px; border-bottom: 1px solid var(--input-border); display: flex; align-items: center; justify-content: space-between; }
.modal-header h3 { margin: 0; font-size: 1.25rem; font-weight: 800; color: var(--title-blue); }
.modal-close-times { background: transparent; border: none; font-size: 1.5rem; color: var(--slogan-color); cursor: pointer; }
.modal-body { padding: 25px; }
.modal-body p { margin: 0 0 15px 0; font-size: 1rem; line-height: 1.5; }
.modal-body input { margin-top: 10px; width: 100%; }
.modal-footer { padding: 15px 25px 20px; display: flex; align-items: center; justify-content: flex-end; gap: 12px; background-color: var(--input-bg); border-top: 1px solid var(--input-border); }
.modal-btn { padding: 10px 20px; border: none; border-radius: 8px; font-weight: 700; cursor: pointer; font-size: 0.95rem; transition: 0.2s ease; }
.btn-primary { background-color: var(--primary-btn); color: white; }
.btn-secondary { background-color: transparent; border: 1px solid var(--input-border); color: var(--text-main); }

/* --- RESPONSIVO --- */
@media (max-width: 950px) {
    .inst-title, .inst-subtitle { font-size: 1.8rem; }
    .layout-asistencia, .layout-wrapper { grid-template-columns: 1fr; gap: 35px; }
    .main-card { margin: 0 auto; max-width: 100%; }
    .table-title { font-size: 1.4rem; flex-wrap: wrap; text-align: center; }
    .main-logo { width: 90px; }
    .table-responsive { max-height: 400px; }
}