:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: radial-gradient(circle at top center, #1a2a3a 0%, #0f1214 80%);
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: #e0e0e0;

    --card-bg: rgba(20, 25, 30, 0.8);
    --card-border: rgba(0, 210, 255, 0.3);
    --card-shadow: rgba(0, 210, 255, 0.05);

    --stat-card-bg: rgba(255, 255, 255, 0.05);
    --stat-card-border: rgba(255, 255, 255, 0.1);
    --stat-card-hover-shadow: rgba(0, 210, 255, 0.2);

    --input-bg: rgba(0, 0, 0, 0.3);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-text: #fff;
    --input-focus-bg: rgba(0, 0, 0, 0.5);

    --primary-color: #0d6efd;
    --cyan-primary: #00d2ff;
    --cyan-shadow: rgba(0, 210, 255, 0.4);
    --primary-shadow: rgba(13, 110, 253, 0.4);

    --table-th-bg: rgba(0, 210, 255, 0.1);
    --table-th-color: #00d2ff;
    --table-td-bg: rgba(255, 255, 255, 0.02);
    --table-td-hover: rgba(255, 255, 255, 0.05);
    --table-border: rgba(255, 255, 255, 0.05);

    --btn-action-bg: rgba(0, 85, 164, 0.6);
    --btn-action-border: #00d2ff;

    --alert-success-bg: rgba(25, 135, 84, 0.2);
    --alert-success-text: #75b798;
    --alert-success-border: #198754;

    --alert-danger-bg: rgba(220, 53, 69, 0.2);
    --alert-danger-text: #ea868f;
    --alert-danger-border: #dc3545;

    --alert-warning-bg: rgba(255, 193, 7, 0.2);
    --alert-warning-text: #ffda6a;
    --alert-warning-border: #ffc107;

    --banner-bg: rgba(20, 25, 30, 0.8);
    --banner-border: rgba(0, 210, 255, 0.5);

    --welcome-bg: rgba(25, 135, 84, 0.2);
    --welcome-border: #198754;
    --welcome-text: #75b798;
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #6c757d;

    --card-bg: #ffffff;
    --card-border: #dee2e6;
    --card-shadow: rgba(0, 0, 0, 0.05);

    --stat-card-bg: #ffffff;
    --stat-card-border: #dee2e6;
    --stat-card-hover-shadow: rgba(0, 0, 0, 0.1);

    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-text: #212529;
    --input-focus-bg: #ffffff;

    --primary-color: #0d6efd;
    --cyan-primary: #00768a;
    /* Darker cyan for light mode */
    --cyan-shadow: rgba(0, 118, 138, 0.2);
    --primary-shadow: rgba(13, 110, 253, 0.2);

    --table-th-bg: #e9ecef;
    --table-th-color: #00768a;
    --table-td-bg: #ffffff;
    --table-td-hover: #f1f3f5;
    --table-border: #dee2e6;

    --btn-action-bg: #0d6efd;
    --btn-action-border: #0d6efd;

    --alert-success-bg: #d1e7dd;
    --alert-success-text: #0f5132;
    --alert-success-border: #badbcc;

    --alert-danger-bg: #f8d7da;
    --alert-danger-text: #842029;
    --alert-danger-border: #f5c2c7;

    --alert-warning-bg: #fff3cd;
    --alert-warning-text: #664d03;
    --alert-warning-border: #ffecb5;

    --banner-bg: #ffffff;
    --banner-border: #dee2e6;

    --welcome-bg: #d1e7dd;
    --welcome-border: #0f5132;
    --welcome-text: #0f5132;
}

body {
    background: var(--bg-main) !important;
    color: var(--text-main);
    min-height: 100vh;
}

h1,
h2,
h3,
h4,
h5 {
    color: var(--text-title);
}

/* Light mode overrides for specific text colors to avoid white-on-white */
[data-theme='light'] h1,
[data-theme='light'] h2,
[data-theme='light'] h3,
[data-theme='light'] h4,
[data-theme='light'] h5 {
    text-shadow: none;
}

.text-muted {
    color: var(--text-muted) !important;
}

/* Use a wrapper to scope some overrides */
.content-wrapper {
    max-width: 1600px;
    margin: 0 auto;
}

/* --- TARJETAS HUD --- */
.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    box-shadow: 0 0 20px var(--card-shadow);
    padding: 1.5rem;
    margin-bottom: 2rem;
}

/* --- STATS CARDS --- */
.stat-card {
    background: var(--stat-card-bg);
    border: 1px solid var(--stat-card-border);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    height: 100%;
    transition: transform 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    border-color: var(--cyan-primary);
    box-shadow: 0 0 15px var(--stat-card-hover-shadow);
}

.stat-number {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1;
    margin-bottom: 0.5rem;
}

/* Colores específicos Stats */
.stat-primary .stat-number {
    color: var(--primary-color);
}

.stat-success .stat-number {
    color: var(--cyan-primary);
}

[data-theme='dark'] .stat-primary .stat-number {
    text-shadow: 0 0 15px var(--primary-shadow);
}

[data-theme='dark'] .stat-success .stat-number {
    text-shadow: 0 0 15px var(--cyan-shadow);
}

/* --- FORMULARIOS --- */
.form-control,
.form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    padding: 0.7rem;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--input-focus-bg);
    border-color: var(--cyan-primary);
    box-shadow: 0 0 0 0.25rem var(--card-shadow);
    color: var(--input-text);
}

[data-theme='dark'] .form-select option {
    background-color: #1a2a3a;
    color: white;
}

.form-label {
    color: var(--cyan-primary);
    font-size: 0.85rem;
    text-transform: uppercase;
    margin-bottom: 0.4rem;
    letter-spacing: 0.5px;
}

.form-text {
    color: var(--text-muted);
    font-size: 0.8rem;
}

/* --- ALERTAS HUD --- */
.alert-hud {
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border-left: 4px solid;
}

.alert-success {
    background: var(--alert-success-bg);
    color: var(--alert-success-text);
    border-color: var(--alert-success-border);
}

.alert-danger {
    background: var(--alert-danger-bg);
    color: var(--alert-danger-text);
    border-color: var(--alert-danger-border);
}

.alert-warning {
    background: var(--alert-warning-bg);
    color: var(--alert-warning-text);
    border-color: var(--alert-warning-border);
}

/* --- TABLA --- */
.table-dark-custom {
    color: var(--text-main);
    border-collapse: separate;
    border-spacing: 0;
    width: 100%;
}

.table-dark-custom th {
    background-color: var(--table-th-bg);
    color: var(--table-th-color);
    text-transform: uppercase;
    font-size: 0.85rem;
    border-bottom: 2px solid var(--cyan-primary);
    padding: 1rem;
}

.table-dark-custom td {
    background-color: var(--table-td-bg);
    border-bottom: 1px solid var(--table-border);
    padding: 1rem;
    vertical-align: middle;
}

.table-dark-custom tr:hover td {
    background-color: var(--table-td-hover);
}

/* Barras progreso tabla */
.progress {
    background-color: var(--table-border);
    border-radius: 2px;
}

.btn-action {
    background: var(--btn-action-bg);
    border: 1px solid var(--btn-action-border);
    color: #fff;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-action:hover {
    background: var(--cyan-primary);
    color: #fff;
}

[data-theme='light'] .btn-action:hover {
    background: #0b5ed7;
}

[data-theme='dark'] .btn-action:hover {
    color: #000;
    box-shadow: 0 0 15px var(--cyan-primary);
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 80px;
    right: 20px;
    width: 45px;
    height: 45px;
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 1000;
    box-shadow: 0 4px 15px var(--card-shadow);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}

.theme-toggle i {
    font-size: 1.2rem;
    color: var(--cyan-primary);
}

/* Banner Login */
.banner-login {
    background: var(--banner-bg);
    border: 2px dashed var(--banner-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    padding: 1.5rem;
}

[data-theme='dark'] .banner-login {
    background-image: linear-gradient(135deg, rgba(0, 85, 164, 0.15), rgba(0, 210, 255, 0.1));
}

/* Welcome Box */
.welcome-box {
    padding: 1rem;
    border-radius: 8px;
    background: var(--welcome-bg);
    border-left: 4px solid var(--welcome-border);
}

.welcome-icon {
    color: var(--welcome-border);
}

.welcome-text {
    color: var(--welcome-text);
}

/* Overrides for specific bootstrap classes that need to be scoped */
[data-theme='light'] .content-wrapper .text-info,
[data-theme='light'] main .text-info,
[data-theme='light'] .card .text-info,
[data-theme='light'] .modal .text-info {
    color: #0dcaf0 !important;
    /* Standard Bootstrap Cyan */
}

[data-theme='light'] .text-warning {
    color: #856404 !important;
}

/* Light mode specific classes for hidden/shown elements */
[data-theme='light'] .text-white {
    color: #212529 !important;
}

[data-theme='light'] .text-light {
    color: #6c757d !important;
}

/* Force standard header behavior */
.navbar .container-fluid,
header .container-fluid,
nav .container-fluid {
    max-width: none !important;
    width: 100% !important;
}

/* Fixes for dark elements in light mode */
[data-theme='light'] .bg-dark {
    background-color: #fff !important;
    border: 1px solid #ced4da;
    color: #212529 !important;
}