:root {
    /* --- TEMA DARK (Por defecto) --- */
    --bg-main: radial-gradient(circle at top center, #1a2a3a 0%, #0f1214 80%);
    --card-bg: rgba(20, 25, 30, 0.9);
    --card-border: rgba(0, 210, 255, 0.4);
    --text-main: #e0e0e0;
    --text-title: #ffffff;
    --text-muted: #adb5bd;
    --cyan-primary: #00d2ff;
    --shadow-color: rgba(0, 210, 255, 0.1);
    --input-bg: rgba(0, 0, 0, 0.5);
    --input-border: rgba(0, 210, 255, 0.2);
    --input-text: #fff;
    --btn-save-bg: linear-gradient(135deg, #0055a4 0%, #00d2ff 100%);
    --info-box-bg: rgba(0, 210, 255, 0.05);
    --switch-bg: rgba(255, 255, 255, 0.15);
}

[data-theme='light'] {
    /* --- TEMA LIGHT --- */
    --bg-main: #f8f9fa;
    --card-bg: #ffffff;
    --card-border: #dee2e6;
    --text-main: #212529;
    --text-title: #1a1d21;
    --text-muted: #6c757d;
    --cyan-primary: #005662;
    /* Oscurecido para legibilidad */
    --shadow-color: rgba(0, 0, 0, 0.05);
    --input-bg: #fff;
    --input-border: #ced4da;
    --input-text: #212529;
    --btn-save-bg: linear-gradient(135deg, #004085 0%, #005662 100%);
    --info-box-bg: rgba(0, 86, 98, 0.05);
    --switch-bg: rgba(0, 0, 0, 0.1);
}

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

.main-hud-container h1,
.main-hud-container h2,
.main-hud-container h3,
.main-hud-container h4,
.main-hud-container h5,
.main-hud-container h6 {
    color: var(--text-title);
}

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

.tech-card {
    background: var(--card-bg);
    border: 1px solid var(--card-border);
    border-radius: 12px;
    backdrop-filter: blur(15px);
    box-shadow: 0 0 30px var(--shadow-color);
    padding: 2.5rem;
    margin-top: 2rem;
}

.profile-header {
    border-bottom: 1px solid var(--card-border);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
    text-align: center;
}

.profile-icon {
    font-size: 4rem;
    color: var(--cyan-primary);
    text-shadow: 0 0 20px var(--shadow-color);
    margin-bottom: 1rem;
}

.form-label {
    color: var(--cyan-primary);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
    font-weight: 600;
}

[data-theme='dark'] .form-label {
    text-shadow: 0 0 5px rgba(0, 210, 255, 0.2);
}

.form-control,
.form-select {
    background-color: var(--input-bg);
    border: 1px solid var(--input-border);
    color: var(--input-text);
    padding: 0.8rem 1rem;
}

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

/* Mejora de legibilidad de placeholders */
.form-control::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

/* Estilo para las opciones del select */
.form-select option {
    background-color: var(--card-bg);
    color: var(--text-main);
}

.btn-save {
    background: var(--btn-save-bg);
    border: none;
    color: #fff;
    font-weight: 700;
    letter-spacing: 1px;
    padding: 1rem;
    transition: all 0.3s;
    text-transform: uppercase;
}

.btn-save:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--shadow-color);
    color: #fff;
}

.info-box {
    background: var(--info-box-bg);
    border-radius: 8px;
    padding: 1rem;
    margin-bottom: 1.5rem;
    border-left: 4px solid var(--cyan-primary);
}

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

[data-theme='dark'] .hover-white:hover {
    text-shadow: 0 0 5px rgba(255, 255, 255, 0.5);
}

/* Estilo premium para el switch */
.form-check-input:checked {
    background-color: var(--cyan-primary) !important;
    border-color: var(--cyan-primary) !important;
}

[data-theme='dark'] .form-check-input:checked {
    box-shadow: 0 0 10px rgba(0, 210, 255, 0.5) !important;
}

.form-check-input {
    background-color: var(--switch-bg);
    border-color: var(--card-border);
    cursor: pointer;
}

/* Knob icon depends on theme for contrast */
[data-theme='dark'] .form-check-input {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba%28255, 255, 255, 0.5%29'/%3e%3c/svg%3e") !important;
}

[data-theme='light'] .form-check-input {
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='rgba%280, 0, 0, 0.5%29'/%3e%3c/svg%3e") !important;
}

.custom-switch-container {
    display: flex;
    align-items: center;
    margin-bottom: 0.5rem;
}

.custom-switch-container .form-check-input {
    width: 3em;
    height: 1.5em;
    margin-left: 0;
    margin-right: 1rem;
    float: none;
    flex-shrink: 0;
    margin-top: 0;
}

.custom-switch-label {
    line-height: 1.2;
    padding-top: 2px;
    color: var(--text-title);
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 1px;
}

.main-hud-container {
    max-width: 1600px;
    margin: 0 auto;
}

.extra-small {
    font-size: 0.75rem;
}

/* 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(--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);
}

/* Navigation buttons */
.nav-tool-btn {
    border-color: var(--card-border) !important;
    color: var(--text-muted) !important;
}

.nav-tool-btn:hover {
    background-color: var(--card-border);
    color: var(--text-title) !important;
}

/* Alerts */
.profile-alert-success {
    background: rgba(25, 135, 84, 0.2);
    color: #75b798;
    border-left: 4px solid #198754;
}

[data-theme='light'] .profile-alert-success {
    background: rgba(25, 135, 84, 0.1);
    color: #198754;
}

.profile-alert-warning {
    background: rgba(255, 193, 7, 0.2);
    color: #ffda6a;
    border-left: 4px solid #ffc107;
}

[data-theme='light'] .profile-alert-warning {
    background: rgba(255, 193, 7, 0.1);
    color: #856404;
}

/* Form switch wrapper */
.switch-wrapper {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

[data-theme='light'] .switch-wrapper {
    background: rgba(0, 0, 0, 0.05);
    border: 1px solid rgba(0, 0, 0, 0.1);
}

/* Input group */
.input-group-text-custom {
    background-color: var(--input-bg);
    border-color: var(--input-border);
    color: var(--text-main);
}