: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: rgba(255, 255, 255, 0.6);
    --card-bg: rgba(20, 25, 30, 0.8);
    --card-border: rgba(0, 210, 255, 0.2);
    --card-border-hover: rgba(0, 210, 255, 0.4);
    --card-shadow: rgba(0, 210, 255, 0.1);
    --cyan-primary: #0dcaf0;
    --input-bg: rgba(0, 0, 0, 0.4);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-focus-bg: rgba(0, 0, 0, 0.6);
    --input-placeholder: #8899aa;
    --btn-action-bg: rgba(0, 210, 255, 0.2);
    --btn-action-hover-bg: #0dcaf0;
    --btn-action-hover-text: #000;
    --evento-card-bg: rgba(255, 255, 255, 0.03);
    --evento-card-hover-bg: rgba(255, 255, 255, 0.06);
    --evento-fecha-bg: rgba(0, 210, 255, 0.15);
    --evento-fecha-border: rgba(0, 210, 255, 0.3);
    --shadow-color: rgba(0, 0, 0, 0.5);
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.1);
    --card-border-hover: rgba(0, 118, 138, 0.3);
    --card-shadow: rgba(0, 0, 0, 0.05);
    --cyan-primary: #00768a;
    --input-bg: #fdfdfd;
    --input-border: #ced4da;
    --input-focus-bg: #ffffff;
    --input-placeholder: #adb5bd;
    --btn-action-bg: rgba(0, 118, 138, 0.1);
    --btn-action-hover-bg: #00768a;
    --btn-action-hover-text: #fff;
    --evento-card-bg: #f1f3f5;
    --evento-card-hover-bg: #e9ecef;
    --evento-fecha-bg: rgba(0, 118, 138, 0.1);
    --evento-fecha-border: rgba(0, 118, 138, 0.2);
    --shadow-color: rgba(0, 0, 0, 0.1);
}

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

.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    backdrop-filter: blur(10px);
    padding: 1.5rem;
    margin-bottom: 1rem;
    transition: all 0.3s;
}

.tech-card:hover {
    border-color: var(--card-border-hover);
    box-shadow: 0 5px 20px var(--card-shadow);
}

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

.alert-hud.alert-success {
    background: rgba(0, 255, 136, 0.1);
    border-color: #00ff88;
    color: #00ff88;
}

.alert-hud.alert-warning {
    background: rgba(255, 193, 7, 0.1);
    border-color: #ffc107;
    color: #ffc107;
}

.alert-hud.alert-danger {
    background: rgba(255, 71, 87, 0.1);
    border-color: #ff4757;
    color: #ff4757;
}

[data-theme='light'] .alert-hud.alert-success {
    color: #00874a;
    border-color: #00874a;
    background: rgba(0, 135, 74, 0.1);
}

[data-theme='light'] .alert-hud.alert-warning {
    color: #78652a;
    border-color: #78652a;
    background: rgba(120, 101, 42, 0.1);
}

[data-theme='light'] .alert-hud.alert-danger {
    color: #b91d1d;
    border-color: #b91d1d;
    background: rgba(185, 29, 29, 0.1);
}

.form-control,
.form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    border-radius: 8px;
}

.form-control:focus,
.form-select:focus {
    background-color: var(--input-focus-bg);
    border-color: var(--cyan-primary);
    box-shadow: 0 0 10px var(--card-shadow);
    color: var(--text-main);
}

.form-control::placeholder {
    color: var(--input-placeholder);
}

.form-label {
    color: var(--cyan-primary);
    font-weight: 600;
    font-size: 0.85rem;
    text-transform: uppercase;
}

.btn-action {
    background: var(--btn-action-bg);
    border: 1px solid var(--cyan-primary);
    color: var(--cyan-primary);
    padding: 0.6rem 1.5rem;
    border-radius: 8px;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    transition: all 0.3s;
}

.btn-action:hover {
    background: var(--btn-action-hover-bg);
    color: var(--btn-action-hover-text);
    box-shadow: 0 0 15px var(--cyan-primary);
}

/* Tarjeta de evento */
.evento-card {
    display: flex;
    gap: 1rem;
    padding: 1rem;
    background: var(--evento-card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    transition: all 0.3s;
    text-decoration: none;
    color: inherit;
}

.evento-card:hover {
    background: var(--evento-card-hover-bg);
    border-color: var(--card-border-hover);
    transform: translateY(-2px);
}

.evento-fecha {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 60px;
    padding: 0.5rem;
    border-radius: 8px;
    background: var(--evento-fecha-bg);
    border: 1px solid var(--evento-fecha-border);
}

.evento-fecha .dia {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--cyan-primary);
    line-height: 1;
}

.evento-fecha .mes {
    font-size: 0.75rem;
    color: var(--cyan-primary);
    text-transform: uppercase;
}

.evento-fecha .diaSemana {
    font-size: 0.65rem;
    color: var(--text-muted);
}

.evento-info {
    flex: 1;
}

.evento-titulo {
    font-weight: 600;
    color: var(--text-title);
    margin-bottom: 0.25rem;
}

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

.evento-meta i {
    margin-right: 0.3rem;
}

.tipo-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    padding: 0.2rem 0.6rem;
    border-radius: 20px;
    font-size: 0.7rem;
    font-weight: 600;
}

.filtros-bar {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
    margin-bottom: 1.5rem;
}

.filtros-bar .form-select {
    max-width: 200px;
}

/* 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(--shadow-color);
    transition: all 0.3s ease;
}

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

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

[data-theme='light'] .text-white {
    color: var(--text-title) !important;
}

[data-theme='light'] .text-muted {
    color: var(--text-muted) !important;
}

[data-theme='light'] .text-white-50 {
    color: var(--text-muted) !important;
}

[data-theme='light'] .text-info {
    color: var(--cyan-primary) !important;
}

[data-theme='light'] .btn-outline-info {
    color: var(--cyan-primary);
    border-color: var(--cyan-primary);
}

[data-theme='light'] .btn-outline-info:hover {
    background-color: var(--cyan-primary);
    color: #fff;
}

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

[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: var(--cyan-primary) !important;
}

[data-theme='light'] .tech-card i.text-info {
    color: var(--cyan-primary) !important;
}

[data-theme='light'] h1 i {
    color: var(--cyan-primary) !important;
}