:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: #0f111a;
    --bg-gradient: radial-gradient(circle at 50% 0, #1a253a, #0f111a);
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: rgba(255, 255, 255, 0.5);
    --card-bg: rgba(20, 25, 35, 0.85);
    --card-border: rgba(13, 202, 240, 0.2);
    --cyan-primary: #0dcaf0;
    --input-bg: #12141a;
    --input-border: #444;
    --input-color: #ffffff;
    --input-group-bg: #161920;
    --hud-number-shadow: rgba(13, 202, 240, 0.3);
    --alert-success-bg: rgba(25, 135, 84, 0.25);
    --alert-success-border: #198754;
    --alert-success-text: #d1e7dd;
    --alert-danger-bg: rgba(220, 53, 69, 0.25);
    --alert-danger-border: #dc3545;
    --alert-danger-text: #f8d7da;
    --shadow-color: rgba(0, 0, 0, 0.6);
    --section-bg: rgba(0, 0, 0, 0.25);
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --bg-gradient: radial-gradient(circle at 50% 0, #e9ecef, #f8f9fa);
    --text-main: #212529;
    --text-title: #000000;
    --text-muted: #6c757d;
    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.1);
    --cyan-primary: #00768a;
    --input-bg: #ffffff;
    --input-border: #ced4da;
    --input-color: #212529;
    --input-group-bg: #e9ecef;
    --hud-number-shadow: rgba(0, 0, 0, 0.1);
    --alert-success-bg: #d1e7dd;
    --alert-success-border: #a3cfbb;
    --alert-success-text: #0a3622;
    --alert-danger-bg: #f8d7da;
    --alert-danger-border: #f1aeb5;
    --alert-danger-text: #58151c;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --section-bg: rgba(0, 0, 0, 0.05);
}

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

/* --- COMPONENTES HUD --- */

.hud-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    backdrop-filter: blur(12px);
    border-radius: 12px;
    box-shadow: 0 4px 20px var(--shadow-color);
}

.label-hud {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    font-weight: 600;
    margin-bottom: 5px;
    display: block;
}

.small-note {
    font-size: 0.7rem;
}

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

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

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

.input-group-text {
    background-color: var(--input-group-bg);
    border: 1px solid var(--input-border);
    color: var(--cyan-primary);
}

.hud-input {
    background-color: var(--input-bg) !important;
    border: 1px solid var(--input-border);
    color: var(--input-color) !important;
    font-weight: 500;
}

.hud-input:focus {
    border-color: var(--cyan-primary);
    box-shadow: 0 0 10px rgba(13, 202, 240, 0.2);
}

.hud-input:-webkit-autofill,
.hud-input:-webkit-autofill:hover,
.hud-input:-webkit-autofill:focus {
    -webkit-text-fill-color: var(--input-color);
    -webkit-box-shadow: 0 0 0px 1000px var(--input-bg) inset;
    transition: background-color 5000s ease-in-out 0s;
}

.display-number {
    font-family: 'Roboto Mono', monospace;
    font-weight: 700;
    font-size: 2.8rem;
    text-shadow: 0 0 15px var(--hud-number-shadow);
}

/* --- ALERTAS --- */
.alert-hud-success {
    background-color: var(--alert-success-bg);
    border: 1px solid var(--alert-success-border);
    color: var(--alert-success-text);
}

.alert-hud-danger {
    background-color: var(--alert-danger-bg);
    border: 1px solid var(--alert-danger-border);
    color: var(--alert-danger-text);
}

/* Botón principal */
.btn-neon {
    background-color: var(--cyan-primary) !important;
    color: #fff !important;
    font-weight: 800;
    text-transform: uppercase;
    border: none;
    transition: all 0.3s ease;
}

.btn-neon:hover {
    background-color: var(--cyan-primary) !important;
    filter: brightness(0.9);
    box-shadow: 0 0 15px var(--cyan-primary);
    color: #fff !important;
}

.section-highlight {
    background-color: var(--section-bg);
    border: 1px solid var(--card-border);
    border-radius: 0.5rem;
}

/* --- 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);
}

/* --- PROTECCIÓN HEADER --- */
[data-theme='light'] .content-wrapper .text-info {
    color: #055160 !important;
}

[data-theme='light'] .content-wrapper .text-warning {
    color: #664d03 !important;
}

[data-theme='light'] .content-wrapper .text-danger {
    color: #842029 !important;
}

.content-wrapper {
    max-width: 900px;
    margin: 0 auto;
}