* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #2563eb;
    --secondary-color: #1e40af;
    --success-color: #10b981;
    --error-color: #ef4444;
    --background: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --border-color: #e2e8f0;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 20px;
}

.login-container {
    width: 100%;
    max-width: 450px;
}

.login-box {
    background: var(--card-bg);
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    padding: 40px;
    animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.login-box h1 {
    color: var(--primary-color);
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 10px;
    font-weight: 700;
}

.login-box h2 {
    color: var(--text-secondary);
    font-size: 1.1rem;
    text-align: center;
    margin-bottom: 30px;
    font-weight: 400;
}

.error-message {
    background: #fee2e2;
    color: var(--error-color);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border-left: 4px solid var(--error-color);
}

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 8px;
    font-size: 0.9rem;
}

.form-group input {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    transition: all 0.3s ease;
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input[readonly] {
    background-color: #f8fafc;
    cursor: not-allowed;
}

.qr-container {
    margin: 30px 0;
    text-align: center;
    animation: fadeIn 0.5s ease-in;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

#qr-code {
    display: inline-block;
    padding: 20px;
    background: white;
    border-radius: 12px;
    box-shadow: var(--shadow);
    margin-bottom: 15px;
}

.qr-instruction {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 15px;
}

.loader {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top: 4px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 15px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

#button-container {
    margin-top: 25px;
}

.btn-login {
    width: 100%;
    padding: 14px 24px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 12px rgba(37, 99, 235, 0.3);
}

.btn-login:hover {
    background: var(--secondary-color);
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(37, 99, 235, 0.4);
}

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

.btn-success {
    background: var(--success-color);
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    background: #059669;
    box-shadow: 0 6px 16px rgba(16, 185, 129, 0.4);
}

.login-footer {
    margin-top: 30px;
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    text-align: center;
}

.login-footer p {
    color: var(--text-secondary);
    font-size: 0.85rem;
}

/* Responsive */
@media (max-width: 480px) {
    .login-box {
        padding: 30px 20px;
    }

    .login-box h1 {
        font-size: 2rem;
    }

    #qr-code {
        padding: 15px;
    }
}

/* Captcha container */
.captcha-container {
    animation: fadeIn 0.5s ease-in;
}

.info-message {
    background: #dbeafe;
    color: #1e40af;
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.9rem;
    border-left: 4px solid var(--primary-color);
}

.info-message.success {
    background: #d1fae5;
    color: #065f46;
    border-left-color: var(--success-color);
}

.info-message p {
    margin: 5px 0;
}

.loader-container {
    text-align: center;
    padding: 20px;
}

.loader-container p {
    color: var(--text-secondary);
    margin-top: 15px;
}

.form-actions {
    margin-top: 25px;
}

/* Input para captcha */
input[type="text"][name="captcha"] {
    text-align: center;
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 0.3em;
    font-family: 'Courier New', monospace;
}

/* QR centrado */
#qr-code {
    display: flex;
    justify-content: center;
    align-items: center;
}

/* Sección QR */
.qr-section {
    margin: 20px 0;
    animation: fadeIn 0.5s ease-in;
}

.qr-container {
    text-align: center;
    padding: 20px;
    background: #f8fafc;
    border-radius: 12px;
    margin: 15px 0;
}

#qr-code {
    display: inline-block;
    padding: 15px;
    background: white;
    border-radius: 8px;
    box-shadow: var(--shadow);
}

.qr-container .loader {
    margin-top: 10px;
}

/* Captcha section */
#captcha-section {
    animation: slideDown 0.5s ease-out;
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Form actions */
.form-actions {
    margin-top: 20px;
}