:root {
    --primary-color: #075e54;
    --primary-light: #128c7e;
    --secondary-color: #25d366;
    --surface-color: #ffffff;
    --bg-color: #f0f2f5;
    --text-primary: #111b21;
    --text-secondary: #667781;
    --error-color: #ff4444;
    --success-color: #06d755;

    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --transition-normal: 0.3s ease;

    --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body.login-page,
body.login-page *,
.login-screen,
.login-screen * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body.login-page,
.login-screen {
    font-family: var(--font-family);
    background: linear-gradient(135deg, var(--primary-color), var(--primary-light));
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body.login-page {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 0;
    padding: 20px;
}

.login-screen {
    padding: 20px;
}

.login-container {
    background: var(--surface-color);
    padding: 40px;
    border-radius: 16px;
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 420px;
    position: relative;
    overflow: hidden;
}

.login-container::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-logo {
    font-size: 3.5rem;
    margin-bottom: 16px;
    animation: pulse 2s infinite;
}

.login-header h1 {
    color: var(--primary-color);
    margin-bottom: 8px;
    font-size: 1.75rem;
    font-weight: 600;
}

.login-header p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.4;
}

.error-message {
    background-color: #ffe6e6;
    color: var(--error-color);
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 20px;
    font-size: 0.875rem;
    border-left: 4px solid var(--error-color);
    display: none;
    animation: slideDown 0.3s ease;
}

.login-form {
    margin-bottom: 24px;
}

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

.form-group label {
    display: block;
    margin-bottom: 6px;
    color: var(--text-primary);
    font-weight: 500;
    font-size: 0.875rem;
}

.form-group input {
    width: 100%;
    padding: 14px 16px;
    border: 2px solid #e1e5e9;
    border-radius: 10px;
    font-size: 1rem;
    font-family: var(--font-family);
    transition: all var(--transition-normal);
    background-color: var(--surface-color);
}

.form-group input:focus {
    outline: none;
    border-color: var(--primary-light);
    box-shadow: 0 0 0 3px rgba(18, 140, 126, 0.1);
    transform: translateY(-1px);
}

.form-group input:valid {
    border-color: var(--success-color);
}

.login-btn {
    width: 100%;
    padding: 14px;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-color));
    color: white;
    border: none;
    border-radius: 10px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

.login-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 0 8px 25px rgba(18, 140, 126, 0.3);
}

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

.login-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.btn-text {
    transition: opacity var(--transition-normal);
}

.btn-spinner {
    display: none;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top: 2px solid white;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

.login-footer {
    text-align: center;
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.login-footer code {
    background: var(--bg-color);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', 'Ubuntu Mono', monospace;
    font-size: 0.75rem;
    color: var(--primary-color);
    font-weight: 600;
}

.login-footer .warning {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 6px;
    margin-top: 12px;
    padding: 8px 12px;
    background: #fff3cd;
    border: 1px solid #ffeaa7;
    border-radius: 6px;
    color: #856404;
    font-size: 0.75rem;
}

.security-info {
    margin-top: 20px;
    padding: 16px;
    background: #f8f9fa;
    border-radius: 8px;
    border-left: 4px solid var(--primary-light);
}

.security-info h3 {
    font-size: 0.875rem;
    color: var(--primary-color);
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 6px;
}

.security-info ul {
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin-left: 16px;
}

.security-info li {
    margin-bottom: 4px;
}

.keyboard-shortcuts {
    margin-top: 16px;
    text-align: center;
}

.keyboard-shortcuts small {
    color: var(--text-secondary);
    font-size: 0.75rem;
}

.kbd {
    display: inline-block;
    padding: 2px 6px;
    background: #f1f3f4;
    border: 1px solid #dadce0;
    border-radius: 4px;
    font-family: monospace;
    font-size: 0.7rem;
    font-weight: 600;
}

.loading {
    pointer-events: none;
}

.loading .btn-text {
    opacity: 0;
}

.loading .btn-spinner {
    display: block;
}

.success-animation {
    animation: successPulse 0.6s ease;
}

.form-group input.error {
    border-color: var(--error-color);
    box-shadow: 0 0 0 3px rgba(255, 68, 68, 0.1);
}

.form-group input.success {
    border-color: var(--success-color);
}

.form-group input:-webkit-autofill {
    -webkit-box-shadow: 0 0 0 30px var(--surface-color) inset;
    -webkit-text-fill-color: var(--text-primary);
}

@keyframes slideDown {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes successPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.05); background: var(--success-color); }
    100% { transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

@media (max-width: 480px) {
    body.login-page {
        padding: 16px;
    }

    .login-container {
        padding: 24px;
    }

    .login-header h1 {
        font-size: 1.5rem;
    }

    .login-logo {
        font-size: 3rem;
    }
}