:root {
    --auth-primary: #007bff;
    --auth-primary-dark: #0062cc;
    --auth-primary-darker: #004a99;
    --auth-border: #eee;
    --auth-disabled-start: #cccccc;
    --auth-disabled-end: #999999;
    --auth-shadow: rgba(0, 0, 0, 0.1);
    --auth-shadow-strong: rgba(0, 0, 0, 0.15);
    --auth-primary-shadow: rgba(0, 123, 255, 0.4);
    --auth-primary-focus-ring: rgba(0, 123, 255, 0.25);
    --auth-card-bg: #ffffff;
    --auth-text: #212529;
    --auth-text-muted: #6c757d;
    --auth-input-bg: #ffffff;
    --auth-page-bg-start: #eef1f6;
    --auth-page-bg-end: #dbe3f0;
}

:root[data-theme="dark"] {
    --auth-primary: #3b93ff;
    --auth-primary-dark: #2678d9;
    --auth-primary-darker: #1c5fae;
    --auth-border: #3a3f47;
    --auth-disabled-start: #4b4f56;
    --auth-disabled-end: #33363b;
    --auth-shadow: rgba(0, 0, 0, 0.4);
    --auth-shadow-strong: rgba(0, 0, 0, 0.55);
    --auth-primary-shadow: rgba(59, 147, 255, 0.35);
    --auth-primary-focus-ring: rgba(59, 147, 255, 0.3);
    --auth-card-bg: #23262c;
    --auth-text: #e9ecef;
    --auth-text-muted: #adb5bd;
    --auth-input-bg: #2c313a;
    --auth-page-bg-start: #14171c;
    --auth-page-bg-end: #1c222c;
}

/* Fallback para navegadores sin JS: el script inline en layout.php siempre
   fija data-theme antes del primer paint, así que esto solo cubre ese caso. */
@media (prefers-color-scheme: dark) {
    :root:not([data-theme]) {
        --auth-primary: #3b93ff;
        --auth-primary-dark: #2678d9;
        --auth-primary-darker: #1c5fae;
        --auth-border: #3a3f47;
        --auth-disabled-start: #4b4f56;
        --auth-disabled-end: #33363b;
        --auth-shadow: rgba(0, 0, 0, 0.4);
        --auth-shadow-strong: rgba(0, 0, 0, 0.55);
        --auth-primary-shadow: rgba(59, 147, 255, 0.35);
        --auth-primary-focus-ring: rgba(59, 147, 255, 0.3);
        --auth-card-bg: #23262c;
        --auth-text: #e9ecef;
        --auth-text-muted: #adb5bd;
        --auth-input-bg: #2c313a;
        --auth-page-bg-start: #14171c;
        --auth-page-bg-end: #1c222c;
    }
}

.theme-toggle-btn {
    position: fixed;
    top: 1.25rem;
    right: 1.25rem;
    z-index: 10;
    width: 42px;
    height: 42px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 2px solid var(--auth-border);
    background: var(--auth-card-bg);
    color: var(--auth-text);
    cursor: pointer;
    transition: background-color 0.3s ease, color 0.3s ease, transform 0.2s ease;
}

@media (max-width: 360px) {
    .theme-toggle-btn {
        position: static;
        margin: 0 auto 1rem;
    }

    body.login-page {
        padding-top: 1rem;
    }
}

.theme-toggle-btn:hover {
    transform: scale(1.08);
}

.theme-toggle-btn:focus-visible {
    outline: 2px solid var(--auth-primary);
    outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
    .theme-toggle-btn {
        transition: none;
    }
}

body.login-page {
    background: linear-gradient(160deg, var(--auth-page-bg-start) 0%, var(--auth-page-bg-end) 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    transition: background-color 0.3s ease;
}

@media (prefers-reduced-motion: reduce) {
    body.login-page {
        transition: none;
    }
}

.login-box {
    width: 100%;
    max-width: 400px;
}

.card {
    border: none;
    border-radius: 15px;
    box-shadow: 0 0 20px var(--auth-shadow);
    background: var(--auth-card-bg);
    color: var(--auth-text);
}

.card-header {
    border-radius: 15px 15px 0 0 !important;
    background: var(--auth-card-bg) !important;
    color: var(--auth-text);
    padding: 20px;
}

.card-header .h1 {
    font-size: clamp(1.25rem, 1rem + 1vw, 1.75rem);
}

.login-box-msg {
    color: var(--auth-text);
    font-size: clamp(1rem, 0.9rem + 0.4vw, 1.15rem);
}

.form-control {
    border-radius: 8px;
    padding: 12px;
    border: 2px solid var(--auth-border);
    background: var(--auth-input-bg);
    color: var(--auth-text);
    transition: all 0.3s ease;
}

.form-control:focus {
    border-color: var(--auth-primary);
    box-shadow: 0 0 0 0.2rem var(--auth-primary-focus-ring);
}

.form-control::placeholder {
    color: var(--auth-text-muted);
    opacity: 1;
}

.input-group {
    margin-bottom: 25px;
    position: relative;
}

.input-group-text {
    border-radius: 8px;
    background: var(--auth-input-bg);
    color: var(--auth-text);
    border: 2px solid var(--auth-border);
}

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

.btn-custom {
    background: linear-gradient(45deg, var(--auth-primary), var(--auth-primary-dark));
    border: none;
    border-radius: 8px;
    padding: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    color: white;
}

.btn-custom:hover:not(:disabled) {
    background: linear-gradient(45deg, var(--auth-primary-dark), var(--auth-primary-darker));
    transform: translateY(-2px);
    box-shadow: 0 5px 15px var(--auth-primary-shadow);
    color: white;
}

.btn-custom:disabled {
    background: linear-gradient(45deg, var(--auth-disabled-start), var(--auth-disabled-end));
    cursor: not-allowed;
    opacity: 0.8;
    transform: none;
    box-shadow: none;
}

.btn-custom:disabled .fa-spinner {
    animation: fa-spin 1s infinite linear;
}

#btnRequestWhatsApp {
    background-color: #176b2c;
    border-color: #176b2c;
    color: #fff;
}

#btnRequestWhatsApp:hover,
#btnRequestWhatsApp:focus {
    background-color: #145c26;
    border-color: #145c26;
    color: #fff;
}

@keyframes fa-spin {
    0% {
        transform: rotate(0deg);
    }

    100% {
        transform: rotate(360deg);
    }
}

.btn-primary:disabled {
    cursor: not-allowed;
    opacity: 0.65;
}

.btn-primary:disabled .fa-spinner {
    animation: fa-spin 1s infinite linear;
}

.img-circle {
    border: 4px solid var(--auth-card-bg);
    box-shadow: 0 0 15px var(--auth-shadow);
    transition: all 0.3s ease;
    border-radius: 50%;
}

.img-circle:hover {
    transform: scale(1.05);
}

.login-footer {
    margin-top: 20px;
    text-align: center;
    font-size: 0.9em;
}

.login-logo {
    margin-bottom: 20px;
    text-align: center;
}

.login-logo img {
    width: 150px;
    height: 150px;
}

.input-group-append .btn-default {
    background: var(--auth-input-bg);
    color: var(--auth-text);
    border: 2px solid var(--auth-border);
}

.icheck-primary>input:first-child+label::before {
    border-color: var(--auth-border);
}