: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);

    --cyan-primary: #00d2ff;
    --shadow-cyan: rgba(0, 210, 255, 0.3);

    --input-bg: rgba(0, 0, 0, 0.3);
    --input-border: rgba(255, 255, 255, 0.15);
    --input-focus-bg: rgba(0, 0, 0, 0.5);
    --input-focus-shadow: rgba(0, 210, 255, 0.25);
    --input-placeholder: #6c757d;

    --btn-bg: rgba(0, 85, 164, 0.6);
    --btn-hover-bg: #00d2ff;
    --btn-hover-text: #000;

    --table-th-border: rgba(0, 210, 255, 0.2);
    --table-td-border: rgba(255, 255, 255, 0.05);

    --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;

    --shadow-color: rgba(0, 0, 0, 0.5);
    --modal-bg: #141619;
    --modal-border: #2c3035;
}

[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, 0.125);
    --card-shadow: rgba(0, 0, 0, 0.05);

    --cyan-primary: #00768a;
    /* Color más oscuro para fondo claro */
    --shadow-cyan: rgba(0, 118, 138, 0.1);

    --input-bg: #fff;
    --input-border: #ced4da;
    --input-focus-bg: #fff;
    --input-focus-shadow: rgba(0, 118, 138, 0.25);
    --input-placeholder: #adb5bd;

    --btn-bg: #00768a;
    --btn-hover-bg: #005c6b;
    --btn-hover-text: #fff;

    --table-th-border: rgba(0, 0, 0, 0.1);
    --table-td-border: rgba(0, 0, 0, 0.05);

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

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

    --shadow-color: rgba(0, 0, 0, 0.1);
    --modal-bg: #ffffff;
    --modal-border: #dee2e6;
}

body {
    background: var(--bg-main) !important;
    color: var(--text-main);
    min-height: 100vh;
    transition: background 0.3s ease, color 0.3s ease;
}

/* Wrapper para proteger estilos del header */
.content-wrapper {
    max-width: 1400px;
    margin: 0 auto;
}

.content-wrapper h1,
.content-wrapper h2,
.content-wrapper h3,
.content-wrapper h4,
.tech-card h1,
.tech-card h2,
.tech-card h3,
.tech-card h4 {
    color: var(--text-title);
    text-shadow: 0 0 10px var(--shadow-cyan);
}

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

/* Scoped text-muted for content only */
.content-wrapper .text-muted,
.tech-card .text-muted {
    color: var(--text-muted) !important;
}

/* --- TARJETA 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: 2rem;
    margin-bottom: 2rem;
    transition: background 0.3s ease, border-color 0.3s ease;
}

/* --- FORMULARIOS --- */
.form-control {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--text-main);
    font-size: 1.2rem;
    padding: 0.8rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

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

.form-control::placeholder {
    color: var(--input-placeholder);
    opacity: 0.8;
    text-transform: none;
}

.form-label {
    color: var(--cyan-primary);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    margin-bottom: 0.5rem;
    font-weight: 700;
}

/* --- BOTONES --- */
.btn-action {
    background: var(--btn-bg);
    border: 1px solid var(--cyan-primary);
    color: #fff;
    text-transform: uppercase;
    font-weight: 700;
    letter-spacing: 1px;
    transition: all 0.3s ease;
}

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

/* --- TABLA DE RESULTADOS --- */
.table-dark-custom {
    --bs-table-bg: transparent;
    --bs-table-color: var(--text-main);
}

.table-dark-custom th {
    color: var(--cyan-primary);
    font-weight: 600;
    width: 35%;
    border-bottom: 1px solid var(--table-th-border);
    padding: 12px;
}

.table-dark-custom td {
    color: var(--text-main);
    border-bottom: 1px solid var(--table-td-border);
    padding: 12px;
}

.table-dark-custom tr:last-child th,
.table-dark-custom tr:last-child td {
    border-bottom: none;
}

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

.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);
}

/* --- SELECTOR DE TEMA --- */
.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);
}

/* --- Ajustes específicos para inputs group --- */
.input-group-text {
    background-color: var(--card-bg);
    border-color: var(--input-border);
    color: var(--text-main);
}

[data-theme='light'] .input-group-text {
    background-color: #e9ecef;
    color: #495057;
}

/* Modales */
.tm-modal .modal-content {
    background-color: var(--modal-bg);
    border: 1px solid var(--modal-border);
    color: var(--text-main);
}