:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: #141619;
    --bg-gradient-start: #1a2a3a;
    --bg-gradient-end: #0f1214;
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: #e0e0e0;
    --text-secondary: #ccc;

    --cyan-primary: #00d2ff;
    --cyan-glow: rgba(0, 210, 255, 0.3);
    --cyan-glow-strong: rgba(0, 210, 255, 0.6);
    --cyan-bg-subtle: rgba(0, 210, 255, 0.1);
    --cyan-border: rgba(0, 210, 255, 0.3);

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

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

    --border-subtle: rgba(255, 255, 255, 0.1);
    --border-secondary: rgba(255, 255, 255, 0.1);

    --result-bg: rgba(0, 0, 0, 0.4);

    --alert-warning-bg: rgba(255, 193, 7, 0.15);
    --alert-warning-border: #ffc107;
    --alert-warning-text: #ffda6a;

    --alert-danger-bg: rgba(220, 53, 69, 0.15);
    --alert-danger-border: #dc3545;
    --alert-danger-text: #ea868f;

    --info-box-bg: rgba(13, 202, 240, 0.1);
    --info-box-border: #0dcaf0;
    --info-box-text: #0dcaf0;

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

    --btn-reset-bg: transparent;
    --btn-reset-border: rgba(255, 255, 255, 0.3);
    --btn-reset-text: #ccc;
    --btn-reset-hover-bg: rgba(255, 255, 255, 0.1);
    --btn-reset-hover-border: #fff;
    --btn-reset-hover-text: #fff;

    --success-text: #75b798;
    --danger-label: #dc3545;
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --bg-gradient-start: #e9ecef;
    --bg-gradient-end: #dee2e6;
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #495057;
    --text-secondary: #6c757d;

    --cyan-primary: #00768a;
    --cyan-glow: rgba(0, 118, 138, 0.2);
    --cyan-glow-strong: rgba(0, 118, 138, 0.4);
    --cyan-bg-subtle: rgba(0, 118, 138, 0.08);
    --cyan-border: rgba(0, 118, 138, 0.4);

    --card-bg: #ffffff;
    --card-border: rgba(0, 0, 0, 0.15);
    --card-shadow: rgba(0, 0, 0, 0.08);

    --input-bg: #ffffff;
    --input-bg-focus: #f8f9fa;
    --input-border: rgba(0, 0, 0, 0.25);
    --input-text: #212529;

    --border-subtle: rgba(0, 0, 0, 0.15);
    --border-secondary: rgba(0, 0, 0, 0.2);

    --result-bg: #f8f9fa;

    --alert-warning-bg: #fff3cd;
    --alert-warning-border: #ffc107;
    --alert-warning-text: #856404;

    --alert-danger-bg: #f8d7da;
    --alert-danger-border: #dc3545;
    --alert-danger-text: #721c24;

    --info-box-bg: #d1ecf1;
    --info-box-border: #0c5460;
    --info-box-text: #0c5460;

    --btn-action-bg: #0d6efd;
    --btn-action-border: #0d6efd;
    --btn-action-hover-bg: #0b5ed7;
    --btn-action-hover-text: #ffffff;

    --btn-reset-bg: transparent;
    --btn-reset-border: rgba(0, 0, 0, 0.3);
    --btn-reset-text: #495057;
    --btn-reset-hover-bg: rgba(0, 0, 0, 0.05);
    --btn-reset-hover-border: #212529;
    --btn-reset-hover-text: #212529;

    --success-text: #198754;
    --danger-label: #dc3545;
}

/* --- ESTILOS GLOBALES --- */
body {
    background: radial-gradient(circle at top center, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 80%) !important;
    color: var(--text-main);
    min-height: 100vh;
}

.content-wrapper {
    max-width: 1000px;
    margin: 0 auto;
}

.content-wrapper h1,
.content-wrapper h2,
.content-wrapper h3,
.content-wrapper h4,
.content-wrapper h5 {
    color: var(--text-title);
    text-shadow: 0 0 10px var(--cyan-glow);
}

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

.content-wrapper .text-secondary {
    color: var(--text-secondary) !important;
}

.content-wrapper .text-center p {
    color: var(--text-secondary);
}

.content-wrapper #resTime {
    color: var(--text-title);
    font-weight: bold;
}

/* --- CONTENEDOR TECH (HUD STYLE) --- */
.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;
    color: var(--text-main);
}

/* --- CABECERA TARJETA --- */
.tech-header {
    border-bottom: 1px solid var(--cyan-border);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
}

.tech-header h5 {
    margin: 0;
    color: var(--cyan-primary);
    font-weight: 700;
    letter-spacing: 1px;
}

/* --- FORMULARIOS --- */
.content-wrapper .form-label {
    color: var(--cyan-primary);
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 1px;
    margin-bottom: 0.4rem;
    font-weight: 600;
}

.content-wrapper .form-control,
.content-wrapper .form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    font-size: 1rem;
    padding: 0.7rem;
}

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

.content-wrapper .input-group-text {
    background-color: var(--cyan-bg-subtle);
    border: 1px solid var(--input-border);
    color: var(--cyan-primary);
    font-weight: 600;
}

.content-wrapper .form-select option {
    background-color: var(--card-bg);
    color: var(--text-main);
}

/* Sección Títulos */
.content-wrapper h6.section-title {
    color: var(--text-title);
    border-bottom: 1px solid var(--border-subtle);
    padding-bottom: 0.5rem;
    margin-top: 1.5rem;
    margin-bottom: 1rem;
    font-size: 0.9rem;
    text-transform: uppercase;
}

.content-wrapper h6.section-title i {
    color: var(--cyan-primary);
    margin-right: 0.5rem;
}

/* --- BOTONES --- */
.btn-action {
    background: var(--btn-action-bg);
    border: 1px solid var(--btn-action-border);
    color: #fff;
    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);
}

.btn-reset {
    background: var(--btn-reset-bg);
    border: 1px solid var(--btn-reset-border);
    color: var(--btn-reset-text);
}

.btn-reset:hover {
    border-color: var(--btn-reset-hover-border);
    color: var(--btn-reset-hover-text);
    background: var(--btn-reset-hover-bg);
}

/* --- RESULTADOS --- */
.result-card {
    background: var(--result-bg);
    border: 1px solid var(--cyan-primary);
    border-radius: 12px;
    margin-top: 2rem;
    overflow: hidden;
}

.result-value-main {
    font-size: 3.5rem;
    font-weight: 700;
    color: var(--cyan-primary);
    text-shadow: 0 0 20px var(--cyan-glow-strong);
    line-height: 1;
}

.result-label {
    text-transform: uppercase;
    font-size: 0.7rem;
    letter-spacing: 1px;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.result-subvalue {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-title);
}

.border-end-dark {
    border-right: 1px solid var(--border-subtle);
}

/* Alertas personalizadas */
.alert-hud {
    background: var(--alert-warning-bg);
    border: 1px solid var(--alert-warning-border);
    color: var(--alert-warning-text);
    border-radius: 8px;
    font-size: 0.9rem;
}

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

/* Info Box superior */
.info-box {
    background: var(--info-box-bg);
    border-left: 3px solid var(--info-box-border);
    padding: 1rem;
    font-size: 0.85rem;
    color: var(--info-box-text);
    border-radius: 0 8px 8px 0;
    margin-bottom: 1.5rem;
}

/* Estilos específicos para campos con clases especiales */
.content-wrapper .form-label.text-danger {
    color: var(--danger-label) !important;
}

.content-wrapper .form-control.border-danger {
    border-color: var(--danger-label) !important;
}

.content-wrapper .form-control.text-danger {
    color: var(--danger-label) !important;
}

.content-wrapper .result-subvalue.text-success {
    color: var(--success-text) !important;
}

.content-wrapper .border-secondary {
    border-color: var(--border-secondary) !important;
}

.content-wrapper .border-top {
    border-top: 1px solid var(--border-secondary) !important;
}

/* --- THEME TOGGLE BUTTON --- */
.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);
}