:root {
    --primary: #00a859; /* Verde TecnoNacho más vibrante */
    --primary-light: #00c367;
    --primary-dark: #008a4a;
    --secondary: #2d3748; /* Color tecnológico */
    --error: #ff4757;
    --success: #00a859;
    --warning: #ffa502;
    --light: #f8f9fa;
    --dark: #1a202c;
    --tech-blue: #4299e1; /* Toque tecnológico */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);
    
    /* Variables para modo claro (valores por defecto) */
    --background-color: #f0f4f8;
    --card-background: #ffffff;
    --text-color: #2d3748;
    --text-secondary: #718096;
    --border-color: #e2e8f0;
    --input-bg: #f8fafc;
}

/* Modo oscuro */
body.dark-mode {
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e6e6e6;
    --text-secondary: #a8a8a8;
    --border-color: #333333;
    --input-bg: #2a2a2a;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.4);

    /* Ajustes específicos para elementos en modo oscuro */
    .login-card {
        background: var(--card-background);
        border-color: var(--border-color);
        box-shadow: var(--shadow);
    }

    .logo-container h2 {
        color: var(--text-color);
    }

    .tabs {
        border-bottom-color: var(--border-color);
    }

    .tab {
        color: var(--text-secondary);
    }

    .tab.active {
        color: var(--primary);
    }

    .tab:not(.active):hover {
        color: var(--primary-light);
    }

    .input-group input {
        border-color: var(--border-color);
        background-color: var(--input-bg);
        color: var(--text-color);
        box-shadow: inset 0 1px 3px rgba(255, 255, 255, 0.05);
    }

    .input-group input:focus {
        background-color: var(--card-background);
        box-shadow: 0 0 0 3px rgba(0, 168, 89, 0.4); /* Un poco más fuerte en oscuro */
    }

    .input-group label {
        color: var(--text-secondary);
        background: var(--card-background);
        background: linear-gradient(to bottom, var(--card-background) 50%, transparent 50%);
    }

    .toggle-pw {
        color: var(--text-secondary);
    }

    .toggle-pw:hover {
        color: var(--primary);
    }

    .btn {
        background: var(--primary);
        color: white;
    }

    .btn:hover {
        background: var(--primary-dark);
        box-shadow: 0 4px 12px rgba(0, 168, 89, 0.5);
    }

    .messages .alert.success {
        background: rgba(0, 168, 89, 0.2);
        color: var(--success);
    }

    .messages .alert.error {
        background: rgba(255, 71, 87, 0.2);
        color: var(--error);
    }

    .error {
        color: var(--error);
    }

    /* Estilos específicos para modo oscuro en la computadora */
    .screen {
        background: #0a0a0a;
        border-color: #1a1a1a;
    }

    .mouse-cover {
        background: #666;
    }

    .base {
        background: #1a1a1a;
    }

    .keyboard {
        background: #222;
    }
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    /* Asegura que las transiciones de color se apliquen globalmente */
    transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

body {
    background-color: var(--background-color);
    background-image: linear-gradient(135deg, var(--background-color) 0%, var(--border-color) 100%);
    min-height: 100vh;
    display: flex;
    font-family: 'Verdana', sans-serif;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--text-color);
    transition: var(--transition);
}

.login-container {
    width: 100%;
    max-width: 450px;
    perspective: 1000px;
    animation: fadeIn 0.6s ease-out;
}

.login-card {
    background: var(--card-background);
    border-radius: 12px;
    box-shadow: var(--shadow);
    padding: 40px;
    transition: var(--transition);
    transform-style: preserve-3d;
    position: relative;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

.login-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.login-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary), var(--tech-blue));
}

.logo-container {
    text-align: center;
    margin-bottom: 30px;
}

.logo-container .logo {
    width: 300px;
    height: auto;
    margin-bottom: 15px;
    transition: var(--transition);
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.logo-container .logo:hover {
    transform: scale(1.05);
    filter: drop-shadow(0 5px 10px rgba(0, 0, 0, 0.15));
}

.logo-container h2 {
    font-size: 1.3rem;
    color: var(--text-color);
    font-weight: 600;
    letter-spacing: 0.5px;
}

.tabs {
    display: flex;
    margin-bottom: 30px;
    border-bottom: 2px solid var(--border-color);
    position: relative;
}

.tab {
    flex: 1;
    padding: 15px 0;
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    color: var(--text-secondary);
    position: relative;
    transition: var(--transition);
    overflow: hidden;
    z-index: 1;
    font-weight: 500;
}

.tab.active {
    color: var(--primary);
    font-weight: 600;
}

.tab:not(.active):hover {
    color: var(--primary-light);
}

.tab.active::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 100%;
    height: 3px;
    background: var(--primary);
    transform-origin: left center;
    animation: underline 0.3s ease-out;
}

.form {
    display: none;
    opacity: 0;
    transform: translateY(10px);
    transition: var(--transition);
}

.form.active {
    display: block;
    opacity: 1;
    transform: translateY(0);
}

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

.input-group input {
    width: 100%;
    padding: 15px 45px 15px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--input-bg);
    box-shadow: inset 0 1px 3px rgba(0, 0, 0, 0.05);
    color: var(--text-color);
}

.input-group input:focus {
    border-color: var(--primary);
    outline: none;
    box-shadow: 0 0 0 3px rgba(0, 168, 89, 0.2);
    background-color: var(--card-background);
}

.input-group label {
    position: absolute;
    top: 15px;
    left: 15px;
    color: var(--text-secondary);
    pointer-events: none;
    transition: var(--transition);
    background: var(--card-background);
    padding: 0 5px;
    border-radius: 6px;
    font-size: 0.9rem;
}

.input-group input:focus+label,
.input-group input:not(:placeholder-shown)+label {
    top: -10px;
    font-size: 0.75rem;
    color: var(--primary);
    font-weight: 500;
    background: linear-gradient(to bottom, var(--card-background) 50%, transparent 50%);
}

.toggle-pw {
    position: absolute;
    right: 15px;
    top: 50%;
    transform: translateY(-50%);
    cursor: pointer;
    opacity: 0.6;
    transition: var(--transition);
    user-select: none;
    background: none;
    border: none;
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.toggle-pw:hover {
    opacity: 1;
    color: var(--primary);
}

.btn {
    width: 100%;
    padding: 16px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
    margin-top: 10px;
    position: relative;
    overflow: hidden;
    letter-spacing: 0.5px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn:hover {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0, 168, 89, 0.3);
}

.btn:active {
    transform: translateY(0);
}

.spinner {
    display: inline-block;
    width: 18px;
    height: 18px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s ease-in-out infinite;
}

.messages {
    margin-bottom: 25px;
    animation: slideDown 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
}

.alert {
    padding: 14px 20px;
    border-radius: 8px;
    margin-bottom: 15px;
    font-size: 0.9rem;
    display: flex;
    align-items: center;
    border-left: 4px solid transparent;
}

.alert i {
    margin-right: 10px;
    font-size: 1.2rem;
}

.alert.success {
    background: rgba(0, 168, 89, 0.1);
    color: var(--success);
    border-left-color: var(--success);
}

.alert.error {
    background: rgba(255, 71, 87, 0.1);
    color: var(--error);
    border-left-color: var(--error);
}

.error {
    display: block;
    color: var(--error);
    font-size: 0.8rem;
    margin-top: 5px;
    animation: shake 0.5s;
}

/* Animaciones */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes underline {
    from {
        transform: scaleX(0);
    }

    to {
        transform: scaleX(1);
    }
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

@keyframes shake {

    0%,
    100% {
        transform: translateX(0);
    }

    20%,
    60% {
        transform: translateX(-5px);
    }

    40%,
    80% {
        transform: translateX(5px);
    }
}

/* Responsive */
@media (max-width: 480px) {
    .login-card {
        padding: 25px;
    }

    .logo-container h2 {
        font-size: 1.1rem;
    }

    .tab {
        padding: 12px 0;
        font-size: 0.9rem;
    }

    .input-group input {
        padding: 12px 40px 12px 12px;
    }

    .toggle-pw {
        right: 12px;
    }
}

/* === FIGURA DEL COMPUTADOR === */
.top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.computer-figure {
    display: flex;
    flex-direction: column;
    align-items: center;
    margin-left: 1rem;
    transform: scale(0.85);
}

.screen {
    width: 120px;
    height: 80px;
    background: linear-gradient(145deg, #c8e6c9, #ffffff);
    border: 4px solid #2e7d32;
    border-radius: 8px;
    position: relative;
    box-shadow: 0 0 20px rgba(46, 125, 50, 0.3);
}

.screen-glow {
    position: absolute;
    top: 10%;
    left: 10%;
    width: 80%;
    height: 60%;
    background: rgba(255, 255, 255, 0.15);
    border-radius: 6px;
    animation: pulse 2s infinite ease-in-out;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 0.15;
    }

    50% {
        opacity: 0.3;
    }
}

/* Estilos para la computadora con mouses */
.computer-figure {
    position: relative;
    width: 180px;
    margin: 0 auto 20px;
}

.screen {
    width: 150px;
    height: 100px;
    background: #1a1a1a;
    border-radius: 10px 10px 0 0;
    border: 8px solid #2a2a2a;
    position: relative;
    overflow: hidden;
    z-index: 2;
}

.screen-glow {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 120, 215, 0.3) 0%, rgba(0, 78, 140, 0.3) 100%);
    opacity: 0.7;
}

.face {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 80px;
    height: 60px;
}

.eyes {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-bottom: 15px;
}

.eye {
    width: 25px;
    height: 25px;
    background: white;
    border-radius: 50%;
    position: relative;
    overflow: hidden;
}

.eye::after {
    content: '';
    position: absolute;
    width: 10px;
    height: 10px;
    background: #333;
    border-radius: 50%;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
}

.mouse-cover {
    position: absolute;
    width: 30px;
    height: 45px;
    background: #555;
    border-radius: 15px 15px 5px 5px;
    top: -10px;
    left: -2px;
    transform: translateY(50px);
    transition: transform 0.4s cubic-bezier(0.68, -0.55, 0.27, 1.55);
    z-index: 3;
}

.left-mouse {
    transform-origin: bottom right;
}

.right-mouse {
    transform-origin: bottom left;
}

.mouth {
    width: 40px;
    height: 10px;
    background: white;
    border-radius: 0 0 10px 10px;
    margin: 0 auto;
    transition: all 0.3s ease;
}

.base {
    width: 180px;
    height: 10px;
    background: #2a2a2a;
    border-radius: 0 0 5px 5px;
    position: relative;
    z-index: 1;
}

.keyboard {
    width: 160px;
    height: 30px;
    background: #333;
    border-radius: 0 0 8px 8px;
    margin: -5px auto 0;
    position: relative;
    z-index: 0;
}

/* Cuando el campo de contraseña está enfocado */
.password-focused .left-mouse {
    transform: translateY(0) rotate(-15deg);
}

.password-focused .right-mouse {
    transform: translateY(0) rotate(15deg);
}

.password-focused .mouth {
    height: 5px;
    width: 20px;
    border-radius: 5px;
    transition: all 0.3s ease;
}

.peeking .left-mouse {
    transform: translateY(15px) rotate(-5deg);
}

.peeking .right-mouse {
    transform: translateY(15px) rotate(5deg);
}

.peeking .mouth {
    width: 30px;
    transition: all 0.3s ease;
}

/* Estilos específicos para modo oscuro en la computadora */
body.dark-mode .screen {
    background: #0a0a0a;
    border-color: #1a1a1a;
}

body.dark-mode .mouse-cover {
    background: #666;
}

body.dark-mode .base {
    background: #1a1a1a;
}

body.dark-mode .keyboard {
    background: #222;
}

/* Botón de modo oscuro flotante opcional */
.dark-mode-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-background);
    border: 2px solid var(--border-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.2rem;
    color: var(--text-color);
    transition: var(--transition);
    z-index: 1000;
    box-shadow: var(--shadow);
}

.dark-mode-toggle:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-hover);
}

.dark-mode-toggle i {
    transition: var(--transition);
}

body.dark-mode .dark-mode-toggle .fa-moon {
    display: none;
}

body.dark-mode .dark-mode-toggle .fa-sun {
    display: block;
}

body:not(.dark-mode) .dark-mode-toggle .fa-sun {
    display: none;
}

body:not(.dark-mode) .dark-mode-toggle .fa-moon {
    display: block;
}